S corporations

Form 7203: S corporation stock and debt basis

Form 7203 is the IRS form S corporation shareholders use to work out their stock and debt basis, filed with their Form 1040. Basis decides how much of a K-1 loss is deductible this year and whether a distribution is tax-free or a capital gain.

Camron Momeni, CPA

VP of Tax Experience

Updated

October 22, 2026

Form revision December 2022

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“S corporation shareholders use Form 7203 to figure the potential limitations of their share of the S corporation’s deductions, credits, and other items that can be deducted on their individual returns.” IRS, About Form 7203

Who has to file Form 7203?

An S corporation shareholder has to file Form 7203 with their Form 1040 in any year one of four events happens, according to the IRS instructions for Form 7203 (Rev. December 2022):

The shareholder claims a share of an S corporation loss, including a loss suspended from a prior year
The shareholder receives a non-dividend distribution
The shareholder sells or otherwise disposes of S corporation stock
The S corporation repays a loan the shareholder made to it

Form 7203 has three parts. Part I tracks stock basis on lines 1 to 15, Part II tracks debt basis on lines 16 to 34, and Part III limits losses and deductions to the stock and debt basis available on lines 35 to 47. The S corporation does not calculate shareholder basis, so the shareholder and their preparer carry the numbers forward from the prior-year Form 7203.

Where does each K-1 number go on Form 7203?

Each Schedule K-1 (Form 1120-S) amount that changes basis has a fixed line on Form 7203. Income items such as box 1 ordinary business income and box 4 interest go in Part I as increases, losses from the same boxes go in Part III, and box 16 codes C and D feed lines 8a and 6.

Schedule K-1 (1120-S)	What it is	Form 7203 line
Box 1	Ordinary business income (loss)	3a, or 35 if a loss
Box 2	Net rental real estate income (loss)	3b, or 36 if a loss
Box 3	Other net rental income (loss)	3c, or 37 if a loss
Box 4	Interest income	3d
Box 5a	Ordinary dividends	3e
Box 6	Royalties	3f
Boxes 7 and 8a	Net capital gain (loss)	3g, or 38 if a loss
Box 9	Net section 1231 gain (loss)	3h, or 39 if a loss
Box 11	Section 179 deduction	41
Box 15, code C	Excess depletion adjustment	3j
Box 16, codes A and B	Tax-exempt income	3k
Box 16, code C	Nondeductible expenses	8a
Box 16, code D	Distributions	6

Dividends reported on Form 1099-DIV stay off line 6, and excluded cancellation of debt income stays off line 3k, per the IRS instructions for lines 6 and 3k.

In what order does S corporation basis change?

Stock basis is the shareholder’s investment in the S corporation for tax purposes. Treas. Reg. 1.1367-1(f) applies four adjustments in a fixed order at the end of each corporate tax year:

Add income, including tax-exempt income (lines 2 to 4)
Subtract non-dividend distributions (line 6)
Subtract nondeductible expenses (lines 8a to 8c)
Subtract losses and deductions, first from stock basis, then from debt basis (Part III)

Each step stops at zero. Distributions above stock basis are capital gain on Form 8949 and Schedule D. Losses above stock and debt basis are suspended and carry forward with no time limit. Under the Treas. Reg. 1.1367-1(g) election, a shareholder can take step 4 before step 3, which frees more basis for losses in the current year.

What does a Form 7203 calculation look like?

For example, Maria owns 100% of an S corporation. She starts the year with $20,000 of stock basis and a $10,000 loan to the company. Her K-1 shows $1,000 of interest, $8,000 of distributions, $2,000 of nondeductible expenses and a $25,000 ordinary loss.

Step	Form 7203	Stock basis after
Beginning stock basis	1	$20,000
Add interest income	3d	$21,000
Subtract distributions	6	$13,000
Subtract nondeductible expenses	8a	$11,000
Loss allowed against stock basis	47(c)	$0
Loss allowed against debt basis ($10,000)	47(d)	Debt basis $0
Suspended loss carried forward	47(e)	$4,000

Maria deducts $21,000 of the $25,000 loss, or 84%, and carries $4,000 forward. The $8,000 distribution is tax-free because Form 7203 applies distributions before losses.

Common miss: debt basis restoration

If Maria's K-1 shows $6,000 of income next year, debt basis is restored by $2,000, not $6,000. The net increase is reduced by that year's losses and the $4,000 carryforward first (line 47, columns (a) and (b)).

What do reviewers check on Form 7203?

A reviewer checking Form 7203 confirms six items, each tied to the IRS instructions or a Treasury regulation. Most errors on Form 7203 come from carrying the wrong number forward from the prior year, so the prior-year return is the first document to pull.

Beginning basis ties to last year

Line 1 matches prior-year line 15, and line 21 matches prior-year line 31.

Instructions, line 1

Distributions come from box 16, code D

Dividends reported on Form 1099-DIV stay off line 6.

Instructions, line 6

Suspended losses carry forward

Last year's column (e) shows up in this year's column (b).

Instructions, Part III

Excess distributions show up as gain

Anything above stock basis on line 5 appears on Form 8949 and Schedule D.

Instructions, line 6

Loan repayments can create gain

Formal notes give capital gain. Open-account debt gives ordinary gain on Form 4797.

Instructions, line 34

Debt basis comes only from direct loans

Guaranteeing company debt doesn't count until the shareholder actually pays.

Treas. Reg. 1.1366-2(a)(2)

Every line checked against the documents the client sent

Filed reads the client's K-1, loan documents and prior-year return, then checks every line of Form 7203 against them. Anything that doesn't tie comes back as a review item with a citation to the source.

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Example review item

Beginning stock basis doesn't tie to prior year

Line 1 shows $18,400. Last year's Form 7203 line 15 shows $20,000. Confirm whether a change in ownership or a correction explains the $1,600 difference.

Source: 2025 return, Form 7203, line 15

Common questions

Who calculates basis, the S corporation or the shareholder?

The shareholder calculates S corporation basis, not the S corporation. The Schedule K-1 reports income, deductions and distributions but not shareholder basis, so beginning basis on Form 7203 comes from the prior-year Form 7203 or the shareholder’s own records.

Can S corporation stock basis go below zero?

No. Stock basis cannot go below zero. Each decrease on Form 7203 stops at zero, and a loss that exceeds stock and debt basis is suspended and carried forward with no time limit, keeping its character as ordinary or capital.

Does a shareholder file Form 7203 every year?

A shareholder files Form 7203 only in a year with a loss claimed, a non-dividend distribution, a stock disposition or a loan repayment. Basis still changes every year, so many firms complete Form 7203 annually to keep the basis history intact.

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