K-1 vs 1099 Tax Rate: What a High-Earning W-2 Family Actually Pays

By Kevin Luu, Co-Founder and Chief Learning Officer. Reviewed on 2026-09-30.

There is no separate “K-1 tax rate” or “1099 tax rate.” Both forms only report income, and the tax depends on what kind of income it is: 1099-NEC consulting pay is taxed at ordinary rates plus self-employment tax, while a K-1 passes through your share of a partnership, S corporation or trust, and each line keeps its own character (ordinary income, qualified dividends, long-term gains). For a California couple with about $900,000 of taxable income from W-2 pay, an extra $50,000 costs about $25,600 in tax as 1099 consulting income, about $26,100 as ordinary K-1 income from a fund, and about $17,600 as a K-1 long-term capital gain.

The surprise for most high-earning W-2 families is that 1099 income is not much worse than K-1 income at their level. The reason is the Social Security wage base, explained below with the full math.

What each form actually reports

A 1099 is an information return from someone who paid you. The common ones in a high-income household are:

• 1099-NEC: fees for work you did as a contractor, such as a physician’s expert-witness work, a scientist’s advisory board fees or a side consulting engagement.
• 1099-DIV, 1099-INT and 1099-B: dividends, interest and sales from your brokerage account, often bundled into one composite statement.

A Schedule K-1 is your slice of an entity that does not pay tax itself. It comes from three different returns:

• Form 1065 (partnerships and most multi-member LLCs): venture, private equity and real estate funds, angel syndicates, a medical practice LLC.
• Form 1120-S (S corporations): a business you or your spouse own and run.
• Form 1041 (trusts and estates): your share of income a trust or estate distributed to you, for example from a parent’s trust.

The practical difference: a 1099 usually shows one number, while a K-1 can show a dozen boxes, each taxed differently on your Form 1040. Our guide on where K-1 income goes on the 1040 walks through the boxes.

How 1099-NEC income is taxed when you already earn W-2 wages

Contract income is subject to self-employment tax: 12.4% for Social Security and 2.9% for Medicare, 15.3% in total, applied to 92.35% of your net earnings (IRS, Schedule SE). That 15.3% is the number that makes 1099 income look expensive.

For this reader it mostly disappears. The Social Security portion only applies up to a per-person cap on that spouse’s wages plus self-employment earnings, which is $184,500 for 2026 (IRS Publication 15). If the spouse earning the consulting fees already has W-2 wages above that, Schedule SE charges no Social Security tax on the side income. What remains is 2.9% Medicare plus the 0.9% Additional Medicare Tax, which applies once a married couple’s combined wages and self-employment income pass $250,000 (Form 8959 instructions). Half of the regular self-employment tax is deductible from income.

Two things work against 1099 income at this level:

• The QBI deduction usually does not help. Owners of pass-through businesses can deduct up to 20% of qualified business income (IRS), but for a specified service business such as health, law or consulting, the deduction is fully phased out for married couples with 2026 taxable income above $553,500 (Rev. Proc. 2025-32). A household earning $750,000 or more gets nothing.
• Nothing is withheld. The payer sends a 1099-NEC by January 31 (IRS instructions) and you owe the tax through estimated payments or extra W-2 withholding.

If the spouse with the consulting income has no W-2 job (for example, a parent who left a full-time role while the kids are small and now consults), the full 12.4% Social Security portion applies to the first $184,500 of earnings. That is the case where 1099 income really is expensive.

How K-1 income is taxed, by type of K-1

Limited partner in a fund

Most K-1s in a W-2 household come from investments: a venture fund, a real estate syndication, a private credit fund. A limited partner’s share of partnership income is excluded from self-employment tax (IRC section 1402(a)(13)), but because it is passive investment income, it is usually hit by the 3.8% Net Investment Income Tax once modified AGI passes $250,000 for a married couple (IRS). So the 3.8% you avoid on the 1099 side comes back as NIIT on the K-1 side.

Each box keeps its character. Long-term gains and qualified dividends on the K-1 get the federal 20% rate for 2026 once married taxable income is above $613,700; interest and ordinary business income are taxed at your top bracket (37% above $768,700 for 2026) (Rev. Proc. 2025-32).

General partner or active LLC member

If you work in the partnership, for example as a partner in a medical group, your share of trade or business income and any fixed payments for your services (section 707(c) payments) are generally subject to self-employment tax, much like 1099 income. The K-1 reports the self-employment amount separately.

S corporation owner

S corporation K-1 income is not subject to self-employment tax. In exchange, an owner who works in the business must be paid reasonable W-2 compensation before taking distributions (IRS). At this income level, the savings on the distribution portion are mostly the 3.8% Medicare layer, which has to cover payroll costs and a second tax return.

Trust or estate beneficiary

A Form 1041 K-1 reports income a trust or estate distributed to you. You pay tax on it at your rates, with the same character the trust earned (interest, dividends, gains). If a trust makes distributions to your children, their K-1 income can fall under the kiddie tax rules: for 2026, a child’s unearned income above $2,700 is generally taxed at the parents’ rate (Rev. Proc. 2025-32, Form 8615 instructions).

Worked example: $50,000 of extra income for a $900,000 household

Assumptions (illustration only): married filing jointly in 2026. One spouse earns $520,000 in salary and RSU vesting, the other $420,000. After deductions, federal taxable income is assumed to be about $900,000 before the extra income, so it sits in the 37% bracket. California taxable income is also assumed to be about $900,000 (in practice the two differ), in the 11.3% bracket for 2025 ($891,542 to $1,485,906, the latest published schedule). The $50,000 arrives in one of three ways.

What the table shows:

• 1099 and ordinary K-1 income cost almost the same. Above the Social Security wage base, the self-employment tax shrinks to 3.8% on 92.35% of the income, while the K-1 picks up a 3.8% NIIT on all of it. The form is not the lever.
• The character of the income is the lever. The capital gain costs about $8,000 less than the same dollars as consulting fees in California, and about $8,100 less in Washington.
• California erases most of the gap people expect. California taxes capital gains as ordinary income (FTB), so the gain is still taxed at 11.3% by the state.
• Washington has no income tax on wages or consulting for 2026 (DOR). Consulting receipts can still be subject to Washington’s business and occupation (B&O) tax, a gross receipts tax that applies to most businesses in the state (DOR); small amounts may be offset by the small business credit, and the Washington totals above leave B&O tax out. A K-1 capital gain can count toward Washington’s 7% capital gains tax, but only on long-term gains above the annual deduction ($278,000 for 2025, the latest published figure), so a $50,000 gain alone usually owes none.

If the consulting spouse had no W-2 wages, the 1099 column would add about $5,726 of Social Security tax (12.4% of $46,175), and the 1099 would become the most expensive option.

California and Washington differences that matter here

• California SDI is withheld at 1.3% of all W-2 wages for 2026 with no cap (EDD). It is a payroll withholding, so it is not taken from 1099 or K-1 income.
• California residents are taxed on K-1 income from everywhere. A fund that invests in other states may also send state K-1s, and some states require a nonresident return or a composite filing. Ask the fund which states to expect.
• Washington has no wage income tax for 2026, but a 9.9% tax on AGI over $1,000,000 takes effect January 1, 2028 (DOR). A Washington household near $1 million that is adding K-1 or consulting income may want to plan for it now.

K-1 losses do not offset your W-2 income

A common reason people give for preferring K-1 investments is that losses flow through. For a limited partner, those losses are usually passive: they offset passive income from other K-1s but not your salary or RSUs. Unused losses carry forward until you have passive income or sell the entire interest (IRS Publication 925). The special allowance that lets some owners deduct rental losses against wages phases out at incomes far below $750,000, so a real estate syndication’s depreciation losses often sit suspended for years.

Timing: why K-1s often push your return past April 15

A calendar-year partnership must give you a K-1 by its return due date, March 15, and later if it files an extension with Form 7004 (Form 1065 instructions). Funds extend routinely, so families with several fund K-1s often extend their own Form 1040. An extension gives more time to file, not to pay. Our article on when you should receive your K-1 covers the calendar.

Because nothing is withheld on 1099 or K-1 income, estimated payments matter. For 2026, a household whose 2025 AGI was above $150,000 generally avoids the federal underpayment penalty by paying at least 110% of its 2025 tax through withholding and estimates, or 90% of its 2026 tax (Form 1040-ES). RSU vesting withholding often runs short for this household as well, so the gap adds up.

Decisions a high-earning family actually makes

1. Take side consulting as 1099 or through an S corporation? With W-2 wages above the wage base, the S corporation mainly saves part of the 3.8% Medicare layer on the distribution portion. On $50,000, that is under $2,000 a year before payroll and tax-prep costs. For many families the saving does not cover the cost of a second return.
2. Shelter the consulting income in a retirement plan? A solo 401(k) or SEP IRA funded from 1099 income can defer part of it. Your employee deferral limit is shared with your W-2 401(k), so the room is usually the employer contribution, which is based on net self-employment earnings, not the gross 1099 amount.
3. Add another fund K-1? Before committing, ask for the fund’s expected K-1 date, which states it files in, and whether it produces mostly ordinary income or long-term gains. A fund that throws off ordinary income is taxed like your salary plus 3.8%.

Our tax management and investment risk management pages describe how we handle these calls for families.

Common mistakes

• Assuming K-1 income is “taxed lower” because it is investment income. Ordinary K-1 income is taxed at 37% plus 3.8% NIIT at this income level.
• Paying full 15.3% self-employment tax in your head when your W-2 wages already exceed $184,500. Check Schedule SE; the Social Security part is often zero.
• Filing before all K-1s arrive, then amending. Wait, or extend.
• Treating passive K-1 losses as a deduction against salary.
• Forgetting that California taxes the capital gain lines at full ordinary rates.

What to write down for your kids

Children see the outcome of a decision like joining a fund, not the reasoning. A one-page note works: why you invested, what you expected the tax to be, and what actually happened when the K-1 arrived. As Kevin puts it: “Your kids don’t need to inherit your portfolio. They need to inherit your decision-making process.” Our Age Five Wealth Education work is built around notes like this.

FAQ

Is K-1 income taxed higher than W-2 income?

Not by itself. Ordinary K-1 income from a fund is taxed at the same federal brackets as wages. Wages carry Medicare tax and, in California, SDI withholding; passive K-1 income instead usually carries the 3.8% Net Investment Income Tax once a married couple’s modified AGI passes $250,000. Long-term gain lines on a K-1 get lower federal rates, though not in California.

Is K-1 income earned income?

Only in some cases. A limited partner’s share of fund income is not earned income, so it does not count for things like IRA contributions or self-employment tax. A general partner’s share of business income and fixed payments for services generally is. We cover this in does K-1 income count as earned income.

Can I receive both a 1099 and a K-1 for the same income?

You should not be taxed twice. Some publicly traded partnerships and brokerages show the sale of a partnership interest on a 1099-B while the K-1 reports your share of income and a basis adjustment. Your preparer reconciles the two so the gain is correct. For rates on fund distributions, see the tax rate on K-1 income.

Next step

Pull last year’s 1099s and K-1s and sort each line into three buckets: consulting income, ordinary investment income and capital gains. That split, not the form name, tells you what the next dollar costs. If you want a second set of eyes on it, the Tax & Wealth Assessment starts there.

This is general education, and the right move depends on your family’s full picture.

Written by

Kevin Luu

Co-Founder and Chief Learning Officer, Bright Advisers

Kevin has advised high-income W-2 tech and biotech families since 2015, and leads the education-first Age Five Family Office from Brea, California.

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