Multi-Member LLC Taxes: K-1, Guaranteed Payments & SE Tax (2026)

The moment you add a second member to an LLC, it stops being a disregarded entity and becomes a partnership for tax purposes — automatically, by IRS default. That means a separate tax return (Form 1065), K-1s to every partner, and self-employment tax on each member's full share of ordinary income. This guide covers what that actually costs, how guaranteed payments work vs. distributions, and what your retirement plan options look like as a partner.

How a multi-member LLC is taxed by default

A multi-member LLC with two or more members is treated as a partnership for federal tax purposes unless the LLC makes an affirmative election to be taxed as a corporation (C-corp via Form 8832) or S-corp (Forms 8832 + 2553).¹

Under default partnership taxation:

• The LLC files Form 1065 (U.S. Return of Partnership Income) each year — due March 15 for calendar-year LLCs (or the next business day if March 15 falls on a weekend)
• Each member receives a Schedule K-1 reporting their share of income, deductions, and credits
• The LLC itself pays no federal income tax — income passes through to members who report it on their personal returns
• Each active member pays self-employment tax on their share of ordinary business income

Distributions vs. guaranteed payments: a critical distinction

Partners receive money from the LLC in two fundamentally different ways — and the tax treatment is completely different:

Guaranteed payments are defined under IRC §707(c) as payments to a partner for services or capital use that are determined without regard to the partnership's income. They look like a salary — and the IRS taxes them like one — but without the FICA withholding mechanics of a W-2. You owe quarterly estimated taxes instead.

The important distinction: a distribution doesn't create additional SE tax because your share of partnership income was already SE-taxable when the LLC earned it. The distribution is just moving cash from the LLC's bank account to yours. Guaranteed payments, on the other hand, are deducted from partnership income before distributive shares are computed — so they shift income to specific partners outside the normal ownership ratio.

Self-employment tax on your distributive share

As an active member of a multi-member LLC, you generally owe SE tax on your entire distributive share of ordinary business income — not just on guaranteed payments.³ This is the single most expensive tax difference between a multi-member LLC and an S-corp.

The 2026 SE tax rates:

• 15.3% on the first $184,500 of SE tax base (2026 SS wage base)⁴
• 2.9% on SE income above $184,500
• 0.9% additional Medicare tax on SE income over $200,000 (single) / $250,000 (MFJ)
• SE tax base = net SE income × 92.35% (mirrors the employer FICA deduction)
• 50% of SE tax is deductible above-the-line — this reduces income tax, but you still pay all of the SE tax

SE tax and K-1 calculator

Your Schedule K-1 decoded

Partners receive a K-1 each year (typically in March, often after the personal return deadline if the LLC uses an extension). Key boxes:

Box 14 is what matters most for your SE tax calculation — the LLC computes it for you and reports the net figure. Confirm it equals your Box 1 income plus guaranteed payments before using it on Schedule SE.

Retirement plans for partnership members

Partners cannot participate in their employer's standard W-2 benefits. Instead, the LLC sponsors retirement plans specifically covering partners. Your options:

SEP-IRA (most common)

The partnership adopts a SEP-IRA covering all partners and eligible employees. Each partner contributes based on their own net self-employment income — 20% of net SE earnings (after the SE deduction), up to $72,000 in 2026.⁵ No year-end election required — you have until the extended return deadline (September 15) to make contributions.

One-participant (solo) 401(k) — if no non-partner employees

If the LLC has no employees other than the partners and their spouses, IRS guidance allows a one-participant 401(k) with two participants.⁶ Each partner contributes as both employee (elective deferral up to $24,500 in 2026, plus $8,000 catch-up at 50–59/64+ or $11,250 super catch-up at ages 60–63) and employer (20% of net SE income). The combined annual additions cap is $72,000 per partner (plus applicable catch-up). Once even one non-partner, non-spouse W-2 employee is added, the plan must convert to a regular 401(k) with ADP testing or a safe harbor design.

SIMPLE IRA — if you have employees

For LLCs with up to 100 employees (partners count), a SIMPLE IRA avoids discrimination testing. $17,000 employee deferral in 2026, plus $4,000 catch-up at 50–59/64+ or $5,250 super catch-up at 60–63. Employer mandatory match: 3% of each participant's compensation. Covers all eligible employees — you can't just set it up for partners.

Regular 401(k) / profit sharing — for larger LLCs

Partnerships with employees can adopt a regular 401(k) or profit sharing plan. A cross-tested profit sharing design can skew contributions heavily toward older, higher-compensated partners while satisfying non-discrimination rules.

QBI deduction for partnership income

Partners in most businesses can deduct 23% of their qualified business income (QBI) — their share of partnership ordinary income less guaranteed payments they received.⁷ However, there's an important limitation above the income thresholds ($201,775 single / $403,500 MFJ for 2026):

The QBI deduction above the threshold is limited to the greater of:

• 50% of W-2 wages paid by the partnership to W-2 employees, OR
• 25% of W-2 wages + 2.5% of qualified property (UBIA)

S-corp election: when it saves money for a multi-member LLC

An S-corp election for a multi-member LLC requires two IRS filings: Form 8832 (to elect corporate status) followed by Form 2553 (to elect S-corp treatment). Once elected, the LLC becomes an S-corp — partners become shareholders, guaranteed payments become W-2 wages, and only the salary portion is subject to FICA.

S-corp election makes sense for a multi-member LLC when:

• Each partner's income share exceeds ~$100,000–$150,000 (below that, compliance costs often eat the savings)
• Income is above the QBI threshold ($201,775/$403,500) and the business has no W-2 employees — the W-2 wage problem described above
• Both partners want to equalize take-home pay through salaries rather than relying on the partnership agreement's distribution waterfall

The mechanics change significantly once you elect S-corp status:

• Partners become W-2 employees of their own S-corp — each receives a salary, payroll tax withholding, and a W-2 at year-end
• Profit above salaries flows as S-corp distributions — no FICA on the distribution portion
• The LLC files Form 1120-S instead of 1065; K-1s change to S-corp format (no SE tax on Box 1 income)
• Solo 401(k) eligibility: S-corp owner-employees qualify directly using their W-2 salary as the contribution base

For the full break-even analysis (including California franchise tax and QBI interaction), see the LLC vs. S-Corp guide. For an S-corp reasonable salary estimate once you've decided to elect, use the S-Corp Reasonable Salary Calculator.

Sources

1. IRS — Limited Liability Company (LLC). Default tax classification: a domestic LLC with 2+ members is classified as a partnership unless it elects corporate treatment. Election via Form 8832 required to change classification to a corporation; Form 2553 additional filing for S-corp election.
2. IRS — Failure to File Penalty. Form 1065 failure-to-file penalty: $255 per partner per month (or partial month), up to 12 months, for returns required to be filed in 2026. Penalty applies even if the partnership had no income or owes no tax. Cross-checked: TaxPenaltyFast 2026 analysis.
3. IRS Publication 541 — Partnerships (12/2025). Self-employment tax treatment for partners: general partners (and active LLC members treated as general partners) include their distributive share of ordinary partnership income in net earnings from self-employment under IRC §1402(a). Guaranteed payments (§707(c)) are always SE-taxable regardless of partner type.
4. SSA — Contribution and Benefit Base (2026). Social Security wage base for 2026: $184,500 (increased from $176,100 in 2025). Announced October 2025. SE tax rate 15.3% on first $184,500 of SE base; 2.9% above. Additional Medicare Tax (0.9%) on SE income over $200,000/$250,000 per IRC §1401(b)(2).
5. IRS — SEP Plan FAQs. Partnership SEP-IRA: contributions based on each partner's net earnings from self-employment. 2026 limit: $72,000 or 25% of compensation (effectively 20% of net SE income for the self-employed). Per IRS Notice 2025-67.
6. IRS — One-Participant 401(k) Plans. "If the company is a partnership, the one-participant plan covers only partners and their spouses." A partnership with only partners (no other common-law employees) may adopt a one-participant 401(k). 2026 limits per IRS Notice 2025-67.
7. IRS — Section 199A QBI Deduction FAQs. QBI deduction: 23% of qualified business income (OBBBA, permanent). W-2 wage limitation applies above phase-out thresholds ($201,775 single / $403,500 MFJ for 2026). Per IRS Rev. Proc. 2025-45.

SE tax rates and SS wage base ($184,500) verified against IRS.gov and SSA.gov for 2026. Form 1065 penalty ($255/partner/month) verified against IRS failure-to-file penalty guidance for returns required to be filed in 2026. QBI phase-out thresholds per IRS Rev. Proc. 2025-45. Retirement plan limits per IRS Notice 2025-67. Values subject to annual adjustment; consult a CPA for current-year figures.