100S Schedule K-1: Shareholder's Share of Income, Deductions, Credits, etc. (2025)
California · FTB · Used for tax years 2025
California Schedule K-1 (100S) reports a shareholder’s share of an S corporation’s income, losses, deductions, credits, and other tax items for 2025. It shows federal amounts, California adjustments, and California-source amounts and credits, along with distributions and other it
Who files this form
Schedule K-1 (100S) is for use by an S corporation and its shareholders only. It reports a shareholder’s share of income, deductions, credits, and other items for tax year 2025.
The form does not state specific filing requirements.
What you'll need
Have the following information and supporting documents available, as applicable:
- Shareholder name, address, identifying number, entity type, and California residency status.
- Corporation name, address, federal employer identification number (FEIN), and California corporation number.
- Current-year allocation percentage, beginning and ending share counts, and beginning and ending shareholder loan amounts.
- Federal Schedule K-1 (Form 1120-S), which supplies the amounts for column (b).
- California adjustments, California-law totals, and California-source amounts and credits.
- Form 592-B for calendar-year withholding. Line 14 must equal the amount on that form.
The form calls for attached schedules for other portfolio income or loss, the IRC Section 179 expense deduction, credits on lines 13a through 13d, other AMT items, gross income from sources outside California, and applicable deductions and losses on line 18d.
Common mistakes
- Do not enter information from this schedule on your California tax return without first reviewing the shareholder’s instructions for Schedule K-1 (100S). The form prints this caution on both Side 2 and Side 3.
Questions people ask
Can this schedule be marked as final or amended?
Yes. Item E has separate boxes for a final Schedule K-1 and an amended Schedule K-1.
Does the form ask whether the shareholder lives in California?
Yes. Item G asks whether the shareholder is a California resident, with Yes and No boxes.
How are federal amounts and California amounts shown?
Column (b) shows amounts from federal Schedule K-1 (Form 1120-S). Column (c) shows California adjustments. Column (d) combines columns (b) and (c), where applicable, to show totals using California law. Column (e) shows California-source amounts and credits.
Where is withholding reported?
Line 14 reports total withholding. For a calendar year, it equals the amount on Form 592-B.
What if the shareholder is a disregarded entity, trust, estate, or nominee?
Item F(2) asks for the name and taxpayer identification number (TIN) of the individual or entity responsible for reporting. This also applies to a person similar to a nominee.