S Corporation Capital Gains and Losses and Built-In Gains

Use the California Tax Form Calculator California Tax Form 100ssd as a stand alone tax form calculator to quickly calculate specific amounts for your 2026 California state tax return. Alternatively, you can use one of our Combined Federal and State Tax Estimators to quickly calculate your salary, tax, and take-home pay.

S Corporation Capital Gains and Losses and Built-In Gains
SECTION A – 8.84% Tax on Built-In Gains
Part I Short-Term Capital Gains and Losses – Assets Held One Year or Less. Use additional sheets if necessary
(a) Description of property (Example: shares % preferred of “Z” Co.)		(b) Date acquired (mm/dd/yyyy)	(c) Date sold (mm/dd/yyyy)	(d) Gross sales price	(e) Cost or other basis plus expense of sale	(f) Gain (loss) col. (d) less col. (e)
1

2	Short-term capital gain from form FTB 3805E, line 26 or line 37 and federal Form 8824. See instructions					2
3a	Net short-term capital gain (loss). Combine line 1, column (f) and line 2					3a
b	Tax on short-term capital gain(s) included on line 12 below					3b
c	Subtract line 3b from line 3a. Enter here and on Form 100S, Schedule K, column (d), line 7 or line 10b					3c
Part II Long-Term Capital Gains and Losses – Assets Held More Than One Year. Use additional sheets if necessary.
4

5	Long-term capital gain from form FTB 3805E, line 26 or line 37 and federal Form 8824. See instructions					5
6a	Net long-term capital gain (loss). Combine line 4, column (f) and line 5					6a
b	Tax on long-term capital gain(s) included on line 12 below					6b
c	Subtract line 6b from line 6a. Enter here and on Form 100S, Schedule K, column (d), line 8 or line 10b					6c
Part III Tax on Built-In Gains. See instructions before completing this part.
7	Excess of recognized built-in gains over recognized built-in losses attributable to California. Attach computation schedule					7
8	Taxable income. Get the instructions for federal Schedule D (Form 1120S). Use California amounts					8
9	Enter the smaller of line 7, line 8, or computed amount. See instructions					9
10	Net operating loss (NOL) carryover deduction from years the corporation was a C corporation. See instructions					10
11	Subtract line 10 from line 9. If zero or less, enter -0- here and on line 12					11
12	Tax on built-in gains. Multiply line 11 by % (financial S corps. must use %). Enter here and on Form 100S, Side 2, line 27					12
Part IV Net Capital Gains (Losses)
13	Combine amounts on Part I, line 3a and Part II, line 6a. Enter here and on Form 100S, Side 1, line 4					13
SECTION B – 1.5% Tax on Capital Gains
Part I Short-Term Capital Gains and Losses – Assets Held One Year or Less. Use additional sheets if necessary
(a) Description of property (Example: shares % preferred of “Z” Co.)		(b) Date acquired (mm/dd/yyyy)	(c) Date sold (mm/dd/yyyy)	(d) Gross sales price	(e) Cost or other basis plus expense of sale	(f) Gain (loss) col. (d) less col. (e)
1

2a	Short-term capital gain from form FTB 3805E, line 26 or line 37 and federal Form 8824. See instructions					2a
b	Combine line 1, column (f) and line 2a. Enter here and on Form 100S, Schedule K, column (d), line 7 or line 10b					2b
c	Unused capital loss carryover from 2016 attributable to the S corporation					2c
3	Net short-term capital gain (loss). Combine line 2b and line 2c					3
Part II Long-Term Capital Gains and Losses – Assets Held More Than One Year. Use additional sheets if necessary
4

5	Enter gain from Schedule D-1, line 9 and/or any capital gain distributions					5
6	Long-term capital gain from form FTB 3805E, line 26 or line 37 and federal Form 8824. See instructions					6
7	Net long-term capital gain (loss). Combine line 4, column (f) through line 6. Enter here and on Form 100S, Schedule K, column (d), line 8 or line 10b					7
8	Enter excess of net short-term capital gain Section B, Part I, line 3 over net long-term capital loss Section B, Part II, line 7					8
9	Net capital gain. Enter excess of net long-term capital gain (line 7) over net short-term capital loss (line 3)					9
10	Total line 8 and line 9. If line 10 is a gain, enter here and on Form 100S, Side 1, line 4. If line 10 is a loss, carry forward losses to taxable year 2018					10

Last reviewed: : If you believe this form requires an update, please contact us.

Quick Access Tools

Frequently Asked Questions

How does community property affect my CA return?

Married/RDP filers may have community property allocation rules; see CA guidance.

Are employer retirement contributions taxed by CA?

Pre-tax 401(k)/403(b) contributions reduce federal and generally CA taxable wages.

Is there a separate Medicare surtax in CA?

Additional Medicare is federal; California PIT is separate and applies via its own brackets/credits.

Does CA tax out-of-state remote work?

CA generally taxes income earned while working in CA; non-CA work may be non-CA source—track days/location.

Can I deduct mortgage interest in CA?

Often yes, subject to CA limits/adjustments; compare standard vs itemized for CA.

Important Notes

All calculations are estimates for guidance only. Always review your return and consider professional advice when submitting official filings.