Quick answer: The S corporation—not the shareholder—prepares a separate Schedule K-1 for each shareholder from Form 1120-S, ownership records and supporting schedules. Allocate items on a per-share, per-day basis unless an authorized closing-of-the-books election applies, report separately stated items and codes, and furnish the K-1 by the return due date.
This guide explains the federal or state rule in practical filing terms. It uses the latest official material available on August 15, 2026; always use the form and instructions for the tax year you are filing because line numbers, limits and procedures can change.
At a glance
| Question | Practical answer |
|---|---|
| Who this applies to | S corporations preparing shareholder information and shareholders reviewing what they received |
| What it does not cover | A shareholder's stock-basis computation or permission to change a K-1 directly |
| Where it is handled | Attach each K-1 to Form 1120-S and furnish a copy to the shareholder |
How the rule works
Start with the legal character of the payment, transaction, benefit or form—not the label used in an advertisement or summary. Tax results can differ when ownership, timing, filing status, residency, basis, participation or documentation changes. The controlling return instructions should be reconciled with all information statements before filing.
- Complete entity name, EIN, shareholder identity, ownership percentage and stock information accurately.
- Allocate ordinary income and each separately stated item according to shares owned and days held, subject to special elections and transfer rules.
- Use the current box codes and attach statements for items such as QBI, international, AMT and basis-related information.
- Distributions are reported as basis-affecting information and are not automatically taxable dividends.
- Shareholders apply stock and debt basis, at-risk, passive-activity and excess-business-loss limitations on their own returns.
Practical example
An S corporation has two equal shareholders for the full year and $100,000 of ordinary income plus a separately stated $4,000 charitable contribution. Each K-1 generally reports $50,000 in box 1 and $2,000 under the applicable contribution code, along with required statements. Each shareholder then applies personal limitations.
The example isolates the main rule and is not a tax calculation for every fact pattern. Other income, deductions, state conformity, related-party rules and prior-year carryovers can change the final result.
Step-by-step checklist
- Finalize Form 1120-S ordinary and separately stated items.
- Reconcile shareholder ownership by day.
- Allocate every item and complete identifying sections.
- Prepare code statements and shareholder basis information.
- Review totals across all K-1s, file, furnish and correct errors promptly.
Keep copies of the filed return, schedules, source documents, calculations and submission confirmation. If an issuer or agency document is wrong, request a correction instead of silently changing a number without an explanatory record.
Common mistakes to avoid
- Allocating annual income using only year-end ownership.
- Combining separately stated items into box 1.
- Telling shareholders the K-1 amount equals their deductible loss without basis analysis.
A tax software interview can help transfer information, but it cannot verify an uncertain legal classification or recreate missing evidence. Pause and obtain advice from a credentialed tax professional or the responsible agency when the dollars are material or the facts are unusual.
Related NavajoTax guides
For connected planning and reporting issues, see guaranteed-payment QBI rules, accounting records guide. Read related pages as a topic cluster, but follow the year-specific official form for the return you actually file.
Frequently asked questions
Does the shareholder file the K-1 with Form 1040?
Usually the shareholder keeps it and reports its items; the IRS instructions identify limited circumstances for attaching it.
Who tracks S corporation stock basis?
The shareholder is responsible, using Form 7203 when required and information supplied by the corporation.
What if the K-1 is wrong?
The corporation should issue a corrected K-1; the shareholder should not alter the original form silently.
Sources reviewed
Last reviewed: August 15, 2026. This article provides general educational information, not individualized tax, legal, investment or benefits advice.