What Is a K-1
The tax form you get when you are an owner — not just an account holder
A Schedule K-1 is an IRS tax document that reports your individual share of income, deductions, credits, and other tax items from a pass-through entity. Unlike a corporation that pays its own taxes, a pass-through entity does not owe federal income tax at the entity level. Instead, the income "passes through" to the owners — and each owner reports their share on their personal tax return.
If you have invested in a partnership, S-corporation, or received distributions from a trust or estate, you will get a K-1. It is not optional — the entity is required by law to issue one to every owner or beneficiary.
Three Types of K-1
Partnerships
Schedule K-1 (Form 1065)
LLCs, LPs, exchange funds, SPVs, PE/VC funds, hedge funds. The most common K-1 for investors.
S-Corporations
Schedule K-1 (Form 1120-S)
Small businesses electing S-corp status. Income passes through to shareholders.
Trusts & Estates
Schedule K-1 (Form 1041)
Income distributed to beneficiaries from trusts, estates, or certain retirement trusts.
"A K-1 does not mean you owe more tax. It means the income is reported differently — and understanding that difference is the first step to managing it."
For most investors reading this, the relevant form is the partnership K-1 (Form 1065). If you have invested in an exchange fund, an SPV, a private equity fund, or any structure organized as an LP or LLC taxed as a partnership, you will receive this form annually — typically months after the tax year closes.
Why You Are Getting One
Partnership structures are everywhere in alternative investing
If you buy stock in Apple through Schwab, you get a 1099. But when you invest in structures designed for tax efficiency, income generation, or concentrated stock solutions, the vehicle is almost always a partnership — and partnerships issue K-1s, not 1099s.
Exchange Funds
Structured as LPs under Section 721. You contribute appreciated stock in-kind and receive a partnership interest. K-1 issued annually to every partner.
SPVs (Special Purpose Vehicles)
Single-investment LLCs or LPs set up for a specific deal. Common in real estate, co-investments, and income overlay strategies. Each SPV issues its own K-1.
Private Equity & Venture Capital
PE and VC funds are structured as limited partnerships. LPs receive K-1s reporting their share of capital gains, management fee offsets, and carried interest allocations.
Real Estate Partnerships
Syndications, development deals, and JV structures. K-1s report rental income, depreciation deductions, and gain/loss on property sales.
Embark structure: Embark Funds accepts in-kind contributions of appreciated stock into a partnership structure under Section 721. Every investor receives a K-1 annually. The fund income overlay strategy generates premium income that flows through the K-1 to each partner.
The common thread: any time you are a partner or member — not just a customer or account holder — you receive a K-1. The number of K-1s you receive each year equals the number of partnership-structured investments you hold.
K-1 Box-by-Box Guide
Understanding the key boxes on your partnership K-1
The partnership K-1 (Form 1065) has over 20 numbered boxes in Part III. Most investors will have entries in only a handful of these. Here are the boxes that matter most — and where each one ends up on your personal return.
| Box | Description | Flows To | Tax Rate |
|---|---|---|---|
| Box 1 | Ordinary business income (loss) | Schedule E, Part II | Ordinary rates (up to 37%) |
| Box 2 | Net rental real estate income (loss) | Schedule E, Part II | Ordinary rates; passive rules apply |
| Box 5 | Interest income | Schedule B | Ordinary rates |
| Box 6a | Ordinary dividends | Schedule B | Ordinary or qualified rates |
| Box 8 | Net short-term capital gain (loss) | Schedule D, Line 5 | Ordinary rates (up to 37%) |
| Box 9a | Net long-term capital gain (loss) | Schedule D, Line 12 | 0% / 15% / 20% LTCG rates |
| Box 11 | Section 179 deduction | Form 4562 | Reduces ordinary income |
| Box 13 | Other deductions (charitable, investment expenses) | Schedule A or applicable form | Varies by deduction type |
| Box 14 | Self-employment earnings (loss) | Schedule SE | 15.3% SE tax (up to cap) |
| Box 16 | Foreign transactions (taxes paid, income sourced abroad) | Form 1116 (foreign tax credit) | Credit offsets US tax |
| Box 19 | Distributions | Not income — reduces basis | Generally not taxed (unless exceeds basis) |
| Box 20 | Other information (Section 199A, UBTI, AMT items) | Various — depends on code letter | Varies |
Key insight: Box 19 (distributions) is the cash you actually received. Every other box represents income or deductions allocated to you by the partnership — whether or not you received a dime. This mismatch is the source of "phantom income" (covered in Section 07).
K-1 vs. 1099
Two different tax worlds — same income, different reporting
Most investors are familiar with 1099 forms from their brokerage. K-1s serve a similar purpose — reporting income — but the mechanics, timing, and complexity are fundamentally different.
| Schedule K-1 | Form 1099 | |
|---|---|---|
| Who issues it | The partnership / S-corp / trust | Banks, brokerages, payers |
| What it reports | Your share of entity income, even if not distributed | Income paid directly to you |
| When you receive it | March through September (often late) | January through February (by Feb 15) |
| Phantom income possible? | Yes — taxable income without cash | No — only reports cash/property received |
| Complexity | High — often requires CPA | Low — most tax software handles it |
| Multiple income types | Yes — one K-1 can include ordinary, capital, rental, foreign | No — separate 1099 per type (INT, DIV, B) |
| State filing impact | May require returns in states where the partnership operates | Reported in your state of residence |
| CPA cost impact | $200 to $500+ per K-1 | Minimal — standard filing |
"A 1099 tells you what you were paid. A K-1 tells you what you owe tax on — and those two numbers are often very different."
How K-1 Income Hits Your Tax Return
From K-1 to Form 1040 — the complete flow
K-1 income does not go on a single line of your tax return. It splinters across multiple schedules depending on the type of income reported. Here is the map:
Schedule E (Part II)
Ordinary income, rental income, deductions
K-1 Boxes 1, 2, 3, 11, 13 flow to Schedule E which aggregates all partnership/S-corp income and flows to Form 1040, Line 5.
Schedule D
Capital gains and losses
K-1 Boxes 8, 9a, 9b, 9c flow to Schedule D. Short-term gains taxed at ordinary rates; long-term gains at preferential rates.
Schedule B
Interest and dividends
K-1 Boxes 5, 6a flow to Schedule B if total interest or dividends exceed $1,500.
Schedule SE
Self-employment tax
K-1 Box 14 flows to Schedule SE. Applies to general partners and active LLC members. Limited partners generally exempt.
The Net Investment Income Tax (NIIT) — Form 8960
If your modified adjusted gross income exceeds $200,000 (single) or $250,000 (married filing jointly), you may owe an additional 3.8% surtax on net investment income — and K-1 income often counts.
Subject to NIIT
Interest, dividends, capital gains, rental income (passive), trading gains from passive activities
Exempt from NIIT
Active business income, self-employment income, distributions that are not income, wages
Passive vs. Active Income on K-1
A critical classification on every K-1 is whether your income is passive or active (non-passive). Limited partners and investors who do not materially participate in the business are almost always classified as passive. This matters because:
- Passive losses can only offset passive income — they cannot offset wages or portfolio income
- Suspended passive losses carry forward until you dispose of the entire interest
- Passive income is subject to NIIT; active business income generally is not
The Late K-1 Problem
Why your K-1 arrives after your tax return is due
The single most common frustration with K-1 investments is timing. Your personal tax return is due April 15. But the partnership return (Form 1065) is not due until March 15 — and most partnerships file for a 6-month extension, pushing the deadline to September 15.
Real Timeline: K-1 from an Exchange Fund Investment
June 2025
You contribute $2M of appreciated stock to an exchange fund (Section 721 contribution)
Dec 31, 2025
Tax year ends. Fund calculates each partner allocable share of income/deductions.
Mar 15, 2026
Partnership return (Form 1065) is due. Most funds file an extension.
Apr 15, 2026
Your personal return is due. You may not have the K-1 yet. File an extension (Form 4868).
Jul to Sep 2026
K-1 arrives. Many complex funds issue K-1s in August or September.
Oct 15, 2026
Extended personal return deadline. You file your complete 1040 with K-1 data.
Why are K-1s late?
- Multi-tiered structures: A fund of funds must wait for K-1s from its underlying partnerships before it can issue its own K-1s. Delay cascades upward.
- Complex allocations: Funds with hundreds of partners, multiple asset classes, and special allocation provisions require significant accounting work.
- Audit adjustments: Fund audits that uncover reclassifications or errors can delay final K-1 issuance.
Strategy: If you hold K-1 investments, plan to file a personal extension every year. Form 4868 gives you until October 15 to file — but remember, an extension to file is not an extension to pay. You still owe estimated taxes by April 15. Work with your CPA to estimate the K-1 impact using prior-year data or fund-provided estimates.
Phantom Income & Basis
When you owe tax on money you never received
One of the most misunderstood aspects of K-1 investing: you can be allocated taxable income without receiving any cash. This is called phantom income — and it happens more often than investors expect.
Example: Phantom Income in Action
A partnership earns $1 million in income but retains the cash to fund operations or new investments. You own 5%.
The result
You owe $18,500 in taxes on income you never received. The cash is inside the partnership — you cannot access it. You need to pay the tax from other funds.
Tax Basis and At-Risk Rules
Your ability to deduct losses from a K-1 is limited by two sequential hurdles:
1. Basis Limitation
You cannot deduct losses exceeding your tax basis in the partnership. Your basis starts with your initial contribution and is adjusted annually: increased by income allocations and additional contributions, decreased by losses, deductions, and distributions. If a loss would reduce your basis below zero, the excess is suspended.
2. At-Risk Limitation (Section 465)
Even if you have sufficient basis, you can only deduct losses up to the amount you have "at risk" — generally cash contributed plus recourse debt you are personally liable for. Nonrecourse debt (where you are not personally liable) generally does not count, with exceptions for qualified real estate financing.
3. Passive Activity Rules (Section 469)
After clearing basis and at-risk hurdles, passive losses can still only offset passive income. Limited partners are generally treated as passive. Excess passive losses are suspended and carried forward indefinitely until you have passive income or fully dispose of the interest.
"The ordering matters: basis first, then at-risk, then passive. A loss that clears one hurdle can still be blocked by the next."
Estimated Tax Implications
If your K-1 income is significant, you may need to make quarterly estimated tax payments (Form 1040-ES) to avoid underpayment penalties. The IRS expects you to pay at least 90% of your current-year tax or 110% of your prior-year tax (for AGI above $150,000) through withholding and estimates. Since K-1 income has no withholding, the entire burden falls on estimated payments.
K-1s in Retirement Accounts
The UBTI trap: when your IRA owes tax
IRAs, 401(k)s, and other retirement accounts are generally tax-exempt. But there is an exception that catches many partnership investors off guard: Unrelated Business Taxable Income (UBTI).
When a tax-exempt account (like an IRA) holds a partnership interest, and that partnership generates certain types of income, the IRA itself may owe tax — even though IRAs normally do not pay taxes.
Generates UBTI
- Active business income from partnerships
- Debt-financed income (leveraged real estate)
- Income from operating businesses in PE/VC funds
- Certain service partnership income
Generally Not UBTI
- Dividends and interest
- Capital gains from securities sales
- Rental income (without debt financing)
- Royalties
The $1,000 Threshold
If gross UBTI exceeds $1,000 in a tax year, the IRA custodian must file Form 990-T and pay tax at trust income tax rates (which reach 37% at just $15,200 of taxable income in 2026). The tax is paid from the IRA itself — reducing your retirement balance.
Since 2018, each unrelated trade or business must be calculated separately — you cannot use losses from one activity to offset income from another (the "silo" rule under Section 512(a)(6)).
Practical note: Many exchange funds and income overlay strategies (like Embark) are designed to minimize or eliminate UBTI for IRA investors. The income from covered call premiums and securities lending is generally not UBTI when structured properly. Always confirm with the fund manager before investing IRA dollars in a partnership.
Frequently Asked Questions
K-1 questions investors ask most
What is a K-1 tax form?
A K-1 is an IRS tax form that reports an individual partner, shareholder, or beneficiary share of income, deductions, and credits from a pass-through entity. There are three versions: Form 1065 K-1 for partnerships, Form 1120-S K-1 for S-corporations, and Form 1041 K-1 for trusts and estates. You use the information on the K-1 to complete your personal Form 1040 tax return.
Why is my K-1 arriving so late?
Partnerships must file Form 1065 by March 15, but most request a 6-month extension to September 15. Complex fund-of-funds structures must wait for K-1s from underlying partnerships before they can issue their own. It is common to receive K-1s in August or September — well past the April 15 personal filing deadline. Plan to file a personal extension (Form 4868) every year you hold K-1 investments.
What is the difference between a K-1 and a 1099?
A 1099 reports income paid directly to you by a bank, broker, or payer. A K-1 reports your allocable share of a pass-through entity income — which may include types of income you never received as cash (phantom income). K-1s are more complex, arrive later, and typically add $200 to $500+ to your CPA bill per K-1.
Can I owe taxes on K-1 income I never received in cash?
Yes. This is called phantom income. Partnerships allocate taxable income based on ownership percentage, not cash distributions. You can be allocated $50,000 of ordinary income without receiving a single dollar. The income is still fully taxable on your personal return. Check Box 19 (distributions) against your other K-1 boxes to see the gap.
What happens if I hold a K-1 investment in my IRA?
If a K-1 partnership generates more than $1,000 in unrelated business taxable income (UBTI) in a year, the IRA itself must file Form 990-T and pay tax at trust rates — even though IRAs are normally tax-exempt. This commonly occurs with investments in operating partnerships, leveraged real estate, and certain PE/VC funds. Check with the fund manager before investing IRA dollars.
How does K-1 income flow to my personal tax return?
K-1 income flows to multiple schedules on Form 1040. Ordinary business income and rental income go to Schedule E. Capital gains flow to Schedule D. Interest and dividend income go to Schedule B. Self-employment income flows to Schedule SE. If your modified AGI exceeds $200,000 ($250,000 married), net investment income may also trigger the 3.8% NIIT via Form 8960.
Do exchange funds issue K-1s?
Yes. Exchange funds are structured as limited partnerships under Section 721. Every investor receives a Schedule K-1 (Form 1065) annually, reporting their allocable share of the fund income, deductions, and credits — regardless of whether any cash was distributed. Income overlay strategies like Embark will show premium income flowing through the K-1.
What are basis and at-risk limitations on K-1 losses?
You can only deduct K-1 losses up to your tax basis in the partnership interest, further limited to the amount you have at risk. Losses exceeding these limits are suspended and carried forward. The ordering is: (1) basis limitation, (2) at-risk limitation under Section 465, (3) passive activity rules under Section 469. Your CPA tracks these annually on Form 6198 (at-risk) and Form 8582 (passive activities).
Next Steps
K-1 complexity should not stop you from investing smarter
K-1 forms add paperwork and CPA fees — there is no way around that. But the reason partnership structures dominate alternative investing is tax efficiency. Pass-through taxation, capital gains treatment, depreciation deductions, and deferral strategies like Section 721 are only available because the income flows through a K-1 instead of being trapped at the entity level.
The cost of preparing a K-1 ($200 to $500 per form at most CPAs) is a rounding error compared to the tax savings these structures enable. The key is working with a CPA who understands partnership taxation — and knowing what to expect before your first K-1 arrives.
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See what your concentrated position could generate.
Embark partnership structure issues clean K-1s with straightforward reporting — while targeting 10%+ annualized income on your appreciated stock.
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