100S Schedule D: S Corporation Capital Gains and Losses and Built-In Gains (2025)
California · FTB · Used for tax years 2025
California Schedule D (100S) reports an S corporation’s short-term and long-term capital gains and losses and calculates tax on built-in gains. It also accounts for unused capital loss carryovers and is attached to Form 100S.
Who files this form
California Schedule D (100S) is for S corporations reporting capital gains and losses and built-in gains. The 2025 schedule is attached to Form 100S.
What you'll need
Have the following information ready:
- Corporation name and California corporation number.
- For each property sale: description, date acquired, date sold, gross sales price, and cost or other basis plus selling expenses.
- Form FTB 3805E and federal Form 8824, if reporting gains from those forms.
- Schedule D-1 and capital gain distribution information, if reporting those amounts in Section B.
- Information about any unused capital loss carryover from 2024 attributable to the S corporation.
For built-in gains, attach the computation schedule required by Section A, line 7. You may also need information about net operating loss carryovers from years when the corporation was a C corporation. Line 8 directs you to the federal Schedule D (Form 1120-S) instructions and requires California amounts.
How to file
Attach Schedule D (100S) to Form 100S. Use additional sheets for property sales if necessary, and attach a computation schedule for Section A, line 7.
The supplied form does not give a mailing address or e-file instructions.
Common mistakes
- Do not complete Section A, Part III without consulting the instructions, as the form directs.
- Use California amounts for taxable income on Section A, line 8.
- Financial S corporations must use 10.84%, rather than 8.84%, when calculating built-in gains tax on Section A, line 12.
- If Section A, line 11 is zero or less, enter 0 on both lines 11 and 12.
- If Section B, line 10 is a loss, follow the direction to carry the loss forward to taxable year 2026.
Questions people ask
What counts as short-term or long-term on this schedule?
Short-term applies to assets held one year or less. Long-term applies to assets held more than one year.
How do I calculate the gain or loss for a property sale?
Subtract column (e), cost or other basis plus selling expenses, from column (d), gross sales price. Enter the result in column (f).
Where do I report the built-in gains tax?
Enter the tax on Section A, line 12, and on Form 100S, Side 2, line 27.
Where does an unused capital loss carryover from 2024 go?
Section B, line 2c is for an unused capital loss carryover from 2024 attributable to the S corporation.
What if I need more room to list sales?
The short-term and long-term parts of both sections allow additional sheets if necessary.