Every box, 1 through 23, and every lettered code for boxes 13, 15, 17, and 20 — including Box 20 Code W and legacy Code Z (Section 199A / QBI) — mapped to the exact TurboTax and H&R Block screen. Free reference. This is not tax or legal advice.
What this means: Your share of the partnership's net ordinary income or loss from trade or business activities. Does NOT include rental income — that goes in Box 2.
⚠ If negative: A negative Box 1 is a loss. TurboTax will apply passive activity rules — you can only deduct this loss if you have passive income from other sources OR materially participate in the business. Most real estate syndication investors cannot deduct this immediately.
Common mistake: Entering rental income here instead of Box 2. Box 1 is for operating businesses. Real estate syndications almost always use Box 2, not Box 1.
Related form: Form 8582 (if loss)
What this means: Your share of net income or loss from rental real estate activities held by the partnership. This is the primary income/loss box for real estate syndication investors.
⚠ If negative: A negative Box 2 is extremely common for real estate syndications — depreciation creates a paper loss. ENTER IT AS NEGATIVE. Do not flip the sign. This loss is passive and will be carried forward unless you have passive income to offset it. It is NOT lost — it reduces your taxable gain when you eventually sell.
Common mistake: Converting the negative number to positive. Also: trying to deduct the passive loss in the current year when you have no passive income — TurboTax will handle carryforward automatically, but users sometimes override it.
Related form: Form 8582 (if loss and no passive income to offset)
What this means: Rental income from activities other than real estate — for example, a partnership that rents out equipment or vehicles. Less common in real estate syndications.
Common mistake: Confusing Box 3 with Box 2. Box 2 is real estate rental. Box 3 is everything else (equipment, aircraft, etc.).
Related form: Form 8582 (if loss)
What this means: Payments the partnership made to you regardless of its profitability — similar to a salary. These are ALWAYS taxable as ordinary income and are subject to self-employment tax.
Common mistake: Thinking guaranteed payments are not taxable because they came from a partnership. They are fully taxable and trigger self-employment tax (Schedule SE).
Related form: Schedule SE
What this means: Your share of the partnership's interest income from bonds, bank accounts, and loans. Reported on Schedule B alongside your regular 1099-INT income.
Common mistake: Skipping this because it seems small. Even $12 of interest income must be reported. Also: entering it in the K-1 interview instead of going to Schedule B — some TurboTax versions handle it differently.
What this means: Box 6a = ordinary dividends. Box 6b = qualified dividends (taxed at lower capital gains rates). Qualified dividends must be entered separately — they receive preferential tax treatment.
Common mistake: Lumping 6a and 6b together as one number. Qualified dividends are taxed at 0%, 15%, or 20% — entering them as ordinary income means you overpay taxes.
What this means: Your share of royalty income — common in oil/gas partnerships, mineral rights, or IP licensing partnerships.
Common mistake: Entering royalties in the wrong Schedule E section. Royalties from partnerships go in a different part of Schedule E than direct royalties.
What this means: Your share of gains or losses from assets the partnership held for one year or less. Taxed at ordinary income rates (10%–37%), not the lower capital gains rates.
⚠ If negative: Short-term capital losses from a K-1 are passive losses. They can offset passive capital gains but are subject to the $3,000 annual deduction limit against ordinary income.
Common mistake: Confusing short-term (Box 8) with long-term (Box 9). Short-term losses are more valuable since they offset ordinary income. Mixing them up changes your tax outcome significantly.
Related form: Schedule D
What this means: Your share of gains or losses from assets held more than one year. Box 9a = standard long-term (0%, 15%, or 20% rates). Box 9b = unrecaptured Section 1250 gain (taxed at up to 25%) — this appears when real estate has been depreciated.
Common mistake: Ignoring Box 9b. Unrecaptured 1250 gain is taxed at a special 25% rate — it is not the same as regular long-term capital gain. Missing it means underreporting tax owed.
Related form: Schedule D, Unrecaptured Section 1250 Gain Worksheet
What this means: Gains and losses from depreciable business property held more than one year (real estate, equipment). Net 1231 gains are taxed as long-term capital gains. Net 1231 losses are ordinary losses.
⚠ If negative: A Section 1231 loss is treated as an ordinary loss (not a capital loss) — this is actually MORE valuable than a capital loss because it offsets ordinary income without the $3,000 cap. Enter it as negative.
Common mistake: Treating 1231 losses as capital losses. They're not. A 1231 loss is an ordinary loss and fully deductible against W-2 income. TurboTax handles this automatically only if entered in the correct field.
Related form: Form 4797
What this means: Box 11 uses letter codes (A through J) for specific types of income. Common codes: Code A = Other portfolio income. Code C = Section 1256 contracts (futures). Code F = Section 951A income (GILTI for multinational partnerships).
Common mistake: Entering the total Box 11 value without specifying the code. Each code has a different tax treatment. Never combine multiple Box 11 codes into one entry.
What this means: Your share of the partnership's Section 179 expense deduction, which allows immediate expensing of business assets. You can only claim this deduction up to your share of the partnership's taxable income — you cannot use a 179 deduction to create a loss.
Common mistake: Claiming the Section 179 deduction without enough qualifying income from the same partnership. TurboTax will carry it forward automatically, but users often don't understand why the deduction 'disappeared.'
Related form: Form 4562
This box uses lettered codes. Find your specific code below:
What this means: Your share of cash contributions made by the partnership. Deductible up to 60% of your Adjusted Gross Income.
Common mistake: Not tracking the AGI limit. If your total charitable deductions exceed 60% of AGI, the excess carries forward — TurboTax calculates this automatically.
What this means: Contributions to certain private foundations and veterans' organizations. Lower 30% AGI deduction limit than Code A.
Common mistake: Combining Code A and Code B into one entry. They have different AGI limits and must be entered separately.
What this means: Property (not cash) donated by the partnership to charity. Requires Form 8283 if over $500.
Common mistake: Not filing Form 8283 when required. Noncash contributions over $500 require documentation — the IRS often flags missing 8283s.
Related form: Form 8283
What this means: Noncash contributions to certain private foundations. 30% AGI limit applies.
Common mistake: Using Code C instructions for Code D. These have different AGI limits.
What this means: Property that would have generated a long-term capital gain if sold, donated to a public charity at fair market value.
Common mistake: Confusing the contribution amount (FMV) with cost basis. Donate at FMV, never at cost basis.
What this means: Capital gain property donated to private foundations. Stricter 20% AGI limit.
Common mistake: Using the wrong AGI limit. Code F is capped at 20% — lower than the other contribution codes.
What this means: Interest paid to finance investments. Deductible only to the extent of net investment income — excess carries forward.
Common mistake: Expecting to deduct the full amount. Investment interest is limited to your net investment income. TurboTax will carry forward the rest — it is not lost.
Related form: Form 4952
What this means: Expenses the partnership incurred to generate royalty income. Entered against the royalty income in Box 7.
Common mistake: Entering Code H deductions without having entered Box 7 royalty income first. TurboTax links them — enter income before expenses.
What this means: Expenses related to portfolio income other than royalties. Note: Miscellaneous itemized deductions were suspended by the Tax Cuts and Jobs Act through 2025 — some Code I deductions may not be currently deductible.
Common mistake: Expecting a tax benefit for Code I deductions in tax years 2018–2025. These are suspended under TCJA. TurboTax will still ask you to enter them — it will determine deductibility automatically.
What this means: Deductions subject to the 2% AGI floor — also suspended under TCJA 2018–2025. Enter anyway for state tax purposes (some states still allow them).
Common mistake: Skipping this because federal deduction is suspended. Some states allow it — TurboTax or H&R Block will apply it to your state return automatically.
What this means: Business interest expense that exceeded the Section 163(j) limitation at the partnership level. Carried to you for tracking — can be deducted in future years when the partnership has sufficient 'adjusted taxable income.'
Common mistake: Treating Code K as a currently deductible expense. It is a carryforward — TurboTax will store it and automatically use it in future years when permitted.
What this means: Your share of the partnership's contributions to retirement plans (SEP, SIMPLE, qualified plans). Deductible on Schedule 1.
Common mistake: Missing this deduction entirely. Partnership retirement contributions are above-the-line deductions — they reduce AGI directly.
What this means: Your share of health insurance premiums paid by the partnership for partners. Deductible above-the-line (reduces AGI).
Common mistake: Not claiming this if you have other self-employed health insurance. This is in addition to any personal self-employed health insurance you already deduct.
What this means: Employer-paid educational assistance provided through the partnership. First $5,250 per year is tax-free.
Common mistake: Not knowing the $5,250 annual limit. Amounts above $5,250 are taxable income, not a deduction.
What this means: Dependent care benefits provided through the partnership. Up to $5,000 ($2,500 if married filing separately) is excludable from income.
Common mistake: Confusing this with the Child and Dependent Care Credit. These are separate — dependent care benefits reduce the income exclusion but affect credit calculations.
What this means: Expenses incurred developing assets before they produce income — common in agricultural and timber partnerships. Can be expensed currently or capitalized depending on elections.
Common mistake: Expensing when capitalization is required. Some partnerships have made specific Section 263A elections — follow the K-1 footnotes.
What this means: Immediate expensing of film and TV production costs under Section 181. Common in entertainment industry partnerships.
Common mistake: Applying this to streaming/digital content that doesn't qualify. Section 181 has specific production and distribution requirements.
What this means: Health insurance deduction specifically for S-corporation shareholders receiving a K-1 on Form 1120S. Entered differently than Code M on a partnership K-1.
Common mistake: Using Code R instructions on a partnership (Form 1065) K-1. Code R applies to S-Corp K-1s (Form 1120S). If your K-1 says Form 1065, use Code M instead.
What this means: Charitable contribution for donating conservation rights to land. Deduction can be up to 50% of AGI (100% for qualified farmers). IMPORTANT: The IRS has classified many syndicated conservation easements as abusive tax shelters — if your K-1 Code S deduction seems very large relative to your investment, consult a CPA before filing.
Common mistake: Claiming an oversized conservation easement deduction without professional review. The IRS has been aggressively auditing these — penalties can reach 40% of the underpayment. This is one of the highest-audit-risk items on any K-1.
Related form: Form 8283
What this means: Less common — relates to portfolio deductions under the throwback rule for certain trusts and partnerships.
Common mistake: Confusing Code T with Code J. These are separate categories with different tax treatments.
What this means: Catch-all for portfolio deductions not covered by other codes. The K-1 footnotes should explain what this represents.
Common mistake: Entering Code U without reading the K-1 footnotes. 'Other' codes always require reading the supplemental information attached to your K-1.
What this means: UBTI is income that can cause a tax-exempt entity (like an IRA) to owe income taxes. If you hold this partnership in a self-directed IRA and your UBTI exceeds $1,000 in a year, your IRA custodian must file Form 990-T and pay tax.
Common mistake: Individual investors trying to enter UBTI on their personal return. This is not entered on Form 1040 — it is for your IRA's records. Notify your self-directed IRA custodian if this box has a value.
Related form: Form 990-T (IRA custodian only)
What this means: Additional preproductive period expenses not covered by Code P. Common in agricultural, timber, or mining partnerships.
Common mistake: Treating these as currently deductible without checking capitalization rules. Read your K-1 footnotes.
What this means: Code A = Net earnings from self-employment. This drives your Social Security and Medicare tax (15.3% up to the SS wage base). Code B = gross farming/fishing income. Code C = gross non-farm income. Most real estate LP investors will NOT have Box 14 entries — it mainly applies to general partners and active members.
⚠ If negative: A negative Box 14 reduces your self-employment tax base from other sources but cannot create a negative SE tax on its own.
Common mistake: Panicking when you see Box 14. Most limited partners in real estate syndications have NO Box 14 entry. If your K-1 shows a Box 14 value, it means the IRS considers you actively involved — which may trigger self-employment tax unexpectedly.
Related form: Schedule SE
This box uses lettered codes. Find your specific code below:
What this means: Dollar-for-dollar tax credit from investing in low-income housing. Passive activity credit — usable against passive income taxes.
Common mistake: Not claiming this credit. It directly reduces your tax bill, dollar for dollar. Never skip housing credits.
Related form: Form 8586
What this means: Same credit as Code A but for buildings not financed with tax-exempt bonds. Tax benefit is identical.
Common mistake: Mixing up Code A and Code B on the TurboTax entry screen. TurboTax has separate fields — select the correct one.
Related form: Form 8586
What this means: Same credit structure as Code A/B but applies to post-2007 buildings. Most current real estate syndication housing credits fall under Code C.
Common mistake: Using Code A instructions for Code C. TurboTax separates these — misclassification doesn't prevent claiming the credit but creates an IRS mismatch.
Related form: Form 8586
What this means: Post-2007 buildings without tax-exempt bond financing. Same dollar-for-dollar credit value as Code C.
Common mistake: Same as Code C vs Code B confusion — select the correct post-2007 code in TurboTax.
Related form: Form 8586
What this means: 20% credit for costs of rehabilitating a certified historic structure used as rental property. This is a passive activity credit — usable against passive income taxes.
Common mistake: Confusing Code E with Box 20 Code D (non-rental rehab credit). Code E is specifically for rental real estate rehabilitation.
Related form: Form 3468
What this means: Catch-all for rental activity credits not covered by Codes A–E. The K-1 footnotes will describe what the credit is for.
Common mistake: Entering Code F without reading the footnotes. 'Other' credit codes always require the supplemental K-1 schedule for proper classification.
What this means: Credits related to portfolio income (interest, dividends, royalties) at the partnership level. Dollar-for-dollar reduction in tax.
Common mistake: Treating portfolio credits as deductions. They reduce actual tax owed — not taxable income.
What this means: Your share of bonus depreciation (100% first-year expensing for qualifying assets). This can significantly reduce current-year income but also affects basis and future depreciation.
Common mistake: Not adjusting your basis after claiming bonus depreciation. Basis is reduced dollar-for-dollar by bonus depreciation taken — ignoring this creates a phantom gain on eventual sale.
What this means: Credits from partnership investment in solar, wind, geothermal, fuel cell, and other clean energy property. The Inflation Reduction Act (IRA 2022) dramatically expanded these credits and introduced transferability and direct pay options for certain entities.
Common mistake: Using the pre-IRA 26% rate instead of the current 30%+ rates for qualifying projects after 2022. Always check the K-1 footnotes for the specific credit percentage applied.
Related form: Form 3468
What this means: Applies to partnerships with foreign investments or operations. Code L (Foreign Taxes Paid) is the most common — it can generate a foreign tax credit that directly reduces your US tax. Code A is a text entry (country name), not a number.
Common mistake: Leaving Code A (country name) blank when entering Code L (foreign taxes paid). TurboTax requires the country name to compute the credit. Without it, the foreign tax credit disappears.
Related form: Form 1116
This box uses lettered codes. Find your specific code below:
What this means: The difference between regular tax depreciation (MACRS) and AMT depreciation (ADS) for assets placed in service after 1986. Regular depreciation is faster than AMT depreciation — this adjustment adds back the difference to compute AMT income.
Common mistake: Skipping Code A because AMT seems unlikely. Even if you don't owe AMT, TurboTax must have this figure to accurately complete Form 6251.
Related form: Form 6251
What this means: The difference in gain or loss when AMT basis (adjusted for AMT depreciation) is used instead of regular tax basis. Common when the partnership has sold depreciable property.
Common mistake: Treating Code B as additional capital gain for regular tax. It is an AMT-only adjustment — it does not affect your regular tax return.
Related form: Form 6251
What this means: Excess of percentage depletion over cost depletion for minerals, timber, and similar resources (not oil/gas). This excess is an AMT preference item — adds to AMT income.
Common mistake: Entering the total depletion deduction instead of the excess. Code C is the DIFFERENCE between percentage and cost depletion, not the total depletion amount.
Related form: Form 6251
What this means: Gross income from oil, gas, and geothermal activities used in the AMT net income calculation for these properties. Required for the AMT percentage depletion limitation.
Common mistake: Confusing Code D (gross income) with Code E (deductions). These are two sides of the same AMT calculation — both must be entered.
Related form: Form 6251
What this means: Deductions for intangible drilling costs and other expenses allocated to oil, gas, and geothermal properties for AMT purposes.
Common mistake: Omitting Code E when Code D is present. These two codes work together — missing either one makes the AMT oil/gas calculation incorrect.
Related form: Form 6251
What this means: Catch-all for AMT items not covered by Codes A–E. The K-1 footnotes will specify what type of AMT adjustment this is.
Common mistake: Entering Code F without reading the K-1 footnotes. Each type of AMT preference item flows to a different line on Form 6251.
Related form: Form 6251
What this means: Code A and B items are not taxed but MUST be entered because they increase your tax basis in the partnership. Code C (nondeductible expenses) reduces your basis. Basis matters when you eventually sell your partnership interest.
Common mistake: Thinking 'tax-exempt = I don't need to enter it.' Wrong. Tax-exempt income still increases your basis. Skipping it means when you sell, your gain will appear larger than it actually is — you'll overpay capital gains tax.
What this means: Distributions are generally NOT taxable income — they are a return of your investment. HOWEVER, if the total distributions you have received over the life of the partnership exceed your cumulative tax basis, the excess IS taxable as a capital gain. TurboTax tracks this automatically only if you enter Box 19 every year.
⚠ If you received cash from the partnership during the year but Box 19 is blank, contact the partnership — they may have omitted it. Distributions in excess of your tax basis are capital gains.
Common mistake: Skipping Box 19 because 'distributions aren't income.' This corrupts your running basis calculation. After several years of skipping it, a future sale of the partnership will produce an incorrect (and overstated) taxable gain.
This box uses lettered codes. Find your specific code below:
What this means: Used to calculate how much of your investment interest expense (Box 13 Code G) is deductible. Does not directly appear on your return but unlocks the Code G deduction.
Common mistake: Entering Code A as income. It is not directly reportable income — it's a computational input for the Form 4952 investment interest limitation worksheet.
Related form: Form 4952
What this means: Investment expenses that reduce net investment income for the Form 4952 calculation. Also suspended as a deduction under TCJA for 2018–2025.
Common mistake: Expecting a deduction. Code B reduces the investment income that Code A measures — it is an input to Form 4952, not a standalone deduction.
Related form: Form 4952
What this means: Your share of the partnership's credit for federal excise taxes paid on fuel used for non-highway purposes. Common in farming, manufacturing, or transportation partnerships.
Common mistake: Missing this credit. It is a dollar-for-dollar credit — every dollar counts. Common in agricultural partnerships.
Related form: Form 4136
What this means: Qualifying rehabilitation costs for certified historic structures that are NOT used for rental real estate. Generates a 20% investment tax credit.
Common mistake: Confusing Code D with Box 15 Code C (which is rehabilitation for rental real estate). These go to different places in TurboTax.
Related form: Form 3468
What this means: The tax basis of energy property for which the partnership is claiming investment tax credits. Required input for Form 3468 credit calculation.
Common mistake: Thinking Code E is a direct credit. It is a basis input — TurboTax uses it to compute the actual credit amount.
Related form: Form 3468
What this means: If the partnership disposed of low-income housing in a way that triggers recapture, you must repay a portion of the housing credits previously claimed. This INCREASES your tax bill.
⚠ If negative: Code F should not be negative — it represents recaptured credits owed back to the IRS.
Common mistake: Skipping Code F because recapture sounds obscure. It represents real tax owed. Missing it will result in an IRS notice.
Related form: Form 8611
What this means: Same as Code F but for low-income housing credits not under Section 42(j)(5) — typically covers other disposition events.
Common mistake: Treating Code G and Code F identically. They use different recapture rules under the tax code.
Related form: Form 8611
What this means: Recapture of investment tax credits previously claimed (energy, rehabilitation, etc.) due to early disposal of qualifying property.
Common mistake: Ignoring this as a reporting item. It increases your tax liability — must be entered.
Related form: Form 4255
What this means: Interest owed or receivable due to the completed-contract or percentage-of-completion method for long-term construction or manufacturing contracts. Rare in most retail real estate partnerships.
Common mistake: Skipping this because it seems irrelevant. If present, it affects your tax — even if it's a refund of interest previously paid.
Related form: Form 8697
What this means: Look-back interest calculation for partnerships that depreciate property using the income forecast method — common in film, video, and entertainment partnerships.
Common mistake: Using Form 8697 (for Code I) instead of Form 8866 (for Code J). They are different forms with different calculations.
Related form: Form 8866
What this means: When the partnership sells property for which Section 179 deductions were previously claimed, some of the gain is recaptured as ordinary income. Your share flows through Box 20 Code K.
Common mistake: Treating Code K as a capital gain. Section 179 recapture is ordinary income — taxed at your highest marginal rate, not capital gains rates.
Related form: Form 4797
What this means: If you left the partnership during the year, previously claimed Section 179 deductions may be recaptured as ordinary income. Code L shows your share.
Common mistake: Skipping Code L when you have sold or redeemed your partnership interest. Recapture is mandatory — it is one of the most commonly missed items on a final-year K-1.
Related form: Form 4797
What this means: When you sell your partnership interest, the portion of the gain attributable to 'hot assets' (unrealized receivables and substantially appreciated inventory) is ordinary income, not capital gain. Box 20 Code M quantifies this. Applies to final-year K-1s when a partner exits.
Common mistake: Reporting all gain from a partnership sale as long-term capital gain. Code M specifically reclassifies a portion as ordinary income — missing it underreports ordinary income and is an IRS audit trigger.
Related form: Form 4797
What this means: Your share of business interest expense subject to the Section 163(j) limitation. The partnership has already applied the limitation at its level — Code N is what passes through to you for tracking and possible future deduction.
Common mistake: Confusing Code N with Box 13 Code K. Box 13 Code K is excess interest carryforward. Box 20 Code N is the current-year Section 163(j) allocation.
What this means: Interest that must be capitalized (added to asset cost) rather than deducted currently, because it relates to the production of property under Section 263A uniform capitalization rules.
Common mistake: Deducting Code O interest currently. It is capitalized — it becomes part of the asset's basis and is recovered through depreciation.
What this means: Relevant to commercial fishing partnerships using a Capital Construction Fund (CCF). Nonqualified withdrawals trigger recapture of previously excluded income.
Common mistake: Not recognizing this box if you're in a fishing partnership. The CCF rules are specific to maritime industry partnerships.
What this means: Information about TRAC lease arrangements where the lessee guarantees a residual value. Relevant mainly for equipment leasing partnerships.
Common mistake: Trying to enter this as a number in TurboTax when no field exists. This is supplemental information for your tax preparer.
What this means: Income from pension or annuity plans held through the partnership. Taxable as ordinary income.
Common mistake: Missing this when it's present. Pension income is fully taxable — never skip Code R.
What this means: Tax and interest from investments in Passive Foreign Investment Companies (PFICs) — often foreign mutual funds or certain foreign ETFs. The PFIC regime is punitive and complex. Code S represents your allocated share of the tax and interest charge.
Common mistake: Treating Code S as a penalty or ignoring it. It is real tax owed — not a fine. Must be entered or you will owe it plus additional penalties.
Related form: Form 8621
What this means: Supplemental basis information provided by the partnership to help you track your tax basis. This is one of the most important pieces of data on your K-1 — your basis limits how much loss you can deduct and determines gain on eventual sale.
Common mistake: Ignoring Code T because there's no obvious entry field. If you've held this partnership for multiple years and have never tracked your basis, you may be over- or under-deducting losses and incorrectly computing gain on sale.
What this means: A basis adjustment that applies to you specifically when you purchased your interest from another partner (rather than investing directly with the partnership). Adjusts your share of depreciation and gain to reflect what you paid for the interest.
Common mistake: Ignoring Code U if you bought your interest on a secondary market. Skipping it means your depreciation deductions are wrong — and your taxable gain on eventual sale will be miscalculated.
What this means: Income from business activities inside the partnership that can cause tax-exempt accounts (IRAs, 401ks, foundations) to owe income tax. If you hold this partnership in a self-directed IRA, your custodian needs this number.
Common mistake: Entering Code V on your personal Form 1040. It doesn't belong there. If you hold the partnership in an IRA, notify your custodian immediately — UBTI tax is due at the IRA level, not your personal return.
Related form: Form 990-T (IRA custodian)
What this means: Section 199A allows a deduction of up to 20% of qualified business income — potentially the largest single deduction on your entire return. It is only available for pass-through entities like partnerships. CRITICAL: This deduction phases out for high-income taxpayers and is eliminated for Specified Service Trades or Businesses (SSTBs) like law firms, medical practices, and financial services above the income threshold. The K-1 must tell you whether you are an SSTB. Do not skip Code W.
Common mistake: Three common mistakes: (1) Skipping Code W entirely — this can forfeit a deduction worth thousands. (2) Not entering W-2 wages and UBIA — these become the limiting factor above ~$383,900 income (2024). (3) Failing to check SSTB status — entering SSTB income as non-SSTB doubles your deduction illegally.
Related form: Form 8995 or Form 8995-A
What this means: The one-time transition tax on accumulated foreign earnings under the 2017 Tax Cuts and Jobs Act. Primarily relevant for partnerships with foreign subsidiaries or controlled foreign corporations. If you are still paying this in installments, Code X tracks your current-year obligation.
Common mistake: Not knowing you still owe Section 965 tax in installments. If your K-1 shows Code X, you may have elected to pay this over 8 years — the installment is due regardless of your other tax situation.
Related form: Form 965
What this means: The 3.8% Net Investment Income Tax applies to investment income (dividends, interest, rental income, capital gains) for taxpayers above $200,000 (single) or $250,000 (MFJ). Code Y tells you how much of the partnership's income is classified as net investment income for NIIT purposes.
Common mistake: Assuming TurboTax's automatic NIIT calculation is correct without checking Code Y. If the partnership has passive losses offsetting income for regular tax purposes, the NIIT calculation may differ — Code Y provides the correct figure.
Related form: Form 8960
What this means: Prior to 2019, Code Z was used for Section 199A information. Starting with the 2019 tax year, Code W replaced it. If you see Code Z on a recent K-1, it may be a partnership using an older template — treat it identically to Code W.
Common mistake: Thinking Code Z and Code W are different deductions. They are the same QBI deduction — just relabeled. Apply the same entry process.
Related form: Form 8995 or 8995-A
What this means: When a partner contributes property with built-in gain or loss to a partnership, Section 704(c) requires that gain or loss to be allocated back to the contributing partner when the property is sold. Code AA quantifies this for your records.
Common mistake: Completely ignoring Code AA. It will directly affect your tax outcome when the contributed property is eventually sold by the partnership — track it carefully.
What this means: When you sell your entire partnership interest, a portion of the gain attributable to the partnership's unrealized receivables and inventory (hot assets) must be reported as ordinary income — not capital gain. This is the single most commonly missed item on a final-year K-1. It can convert what looks like a capital gain into partially ordinary income.
Common mistake: Reporting 100% of the gain from selling a partnership interest as capital gain. Code AB specifically breaks out the ordinary income portion. Misclassifying it understates ordinary income and triggers IRS matching notices.
Related form: Form 4797
What this means: The actual dollar amount of foreign taxes paid, distinct from Box 16 which categorizes the type. Generates a direct credit against your US taxes. Even small amounts ($10–$50) are worth claiming.
Common mistake: Entering this as a deduction instead of a credit. It's a credit — dollar for dollar. Going to Deductions instead of Credits will give you far less tax benefit.
Related form: Form 1116
What this means: Box 22 shows the partnership's total book income or loss for reconciliation purposes. It is NOT entered into TurboTax or H&R Block. It exists so you can verify the other boxes add up correctly.
Common mistake: Trying to enter Box 22 somewhere in TurboTax. There is no field for it. Attempting to force it into 'Other Income' will create a duplicate entry and overstate your income.
What this means: Appears when you bought your partnership interest from another investor (secondary market purchase) at a price different from the original partner's basis. The 743(b) adjustment corrects your share of depreciation and gain to reflect what YOU paid, not what the original partner paid.
Common mistake: Ignoring Box 23 because it looks unfamiliar. If you bought real estate syndication units on a secondary market and Box 23 has a value, skipping it means your depreciation deductions are wrong — often overstated, which will cause a larger taxable gain on sale.