Schedule K-1 in 2026: S-Corp and Partnership K-1 Line-by-Line and Basis Guide
S-Corp K-1 (1120-S) Essentials
- Ordinary income, QBI items, interest, credits.
- Salary on W-2, not K-1 — see S-Corp and Payroll.
- Basis: stock + loan basis tracked; losses limited to basis + at-risk.
Partnership K-1 (1065) Essentials
- Self-employment, 199A, capital account (tax vs book), liabilities share.
- Guaranteed payments vs distributions distinguished.
Pair with Year-End Tax Planning, Year-End Close, Estimated Taxes, and Filing Deadlines.
Basis Worksheet (Keep Annually)
Beginning basis + income − losses − distributions + contributions = ending basis. Attach debt basis logs for S-corp loans.
Tie to Financial Statement Analysis and QSBS holding where relevant.
State Copies
Apportion by state K-1 schedules; file nonresident returns where sourced — see Multi-State and SALT.
Retain K-1 packet per Record Retention and Audit Procedures.
Worked Example: Reading Your First K-1
S-corp owner, 40% shareholder. K-1 shows: ordinary income $120,000, distributions $90,000, beginning stock basis $50,000.
| Step | Math | Result |
|---|---|---|
| Beginning basis | $50,000 | |
| Add: share of income | +$120,000 | $170,000 |
| Less: distributions (return of basis) | −$90,000 | $80,000 ending basis |
| Tax due on | $120,000 (not $90,000 cash) | Owed regardless of distribution |
The $30,000 gap (income > cash) is the classic K-1 surprise — phantom income from receivables growth or non-cash adjustments. This is why tax distributions exist in operating agreements (see Operating Agreement): without a clause forcing distributions to cover K-1 tax, owners fund the IRS from personal savings. True-up Estimated Taxes on the K-1 run-rate each quarter, not on cash received.
Loss Limits: Basis, At-Risk, Passive (In That Order)
A $100,000 K-1 loss is deductible only if it survives three gates: (1) stock/debt basis — losses capped at basis, excess suspended and carried forward; S-corp owners get debt basis only from direct shareholder loans (bank debt guaranteed by the owner does not count); (2) at-risk rules — nonrecourse financing excluded; (3) passive activity rules — non-material participants suspend losses against passive income only. Track all three on the annual basis worksheet — most K-1 software prints basis but not at-risk/passive carryforwards, so maintain them manually and reconcile before filing the personal return.
Guaranteed Payments vs Distributions (Partnerships)
Guaranteed payments (fixed amounts for services/capital, paid regardless of profit) are ordinary income to the partner and deductible to the partnership — the partnership equivalent of salary. Distributions are basis returns. Confusing them misstates both self-employment tax and QBI: guaranteed payments generally don’t qualify for the 199A deduction the way profit shares might. New partners should confirm in the partnership agreement which payments are which before the first K-1 arrives, and reconcile to Payroll where partners also take W-2 wages from related entities.
FAQ
When are K-1s due?
Generally March 15 with extension to Sept 15 for calendar entities. Confirm IRS calendar yearly.
What if K-1 arrives late?
Extend personal return; do not file on estimates if material — amend later costs more.
Next Steps
- Reconcile K-1 to basis and cash before filing personal return.
- True-up estimates for next year on K-1 run-rate.
- Archive K-1 + basis + state copies together.