How to Fill Out IRS Form 7203: Stock Basis, Debt Basis, and Loss Limits

To fill out IRS Form 7203, you work through three parts in order: Part I calculates your stock basis, Part II calculates your debt basis if you personally loaned money to the corporation, and Part III determines how much of the corporation’s losses you can actually deduct. Most of the numbers come straight from your Schedule K-1 (Form 1120-S) and from last year’s ending basis figures. The form attaches to your Form 1040, and you file it whenever you claimed a pass-through loss, received a non-dividend distribution, disposed of stock, or received a loan repayment from the corporation during the year.¹

Confirm You Actually Have to File

You need Form 7203 for the tax year if any of these happened:

You claimed a loss or deduction from the S corporation, including a suspended loss carried forward from a prior year.
You received a non-dividend distribution.
You sold, gifted, or otherwise disposed of your stock.
The corporation repaid all or part of a loan you personally made to it.

If none of those apply, you don’t file for that year, but you still need to track basis on your own so next year’s opening figure is right.¹ Spouses who both own shares in the same S corporation and file jointly each complete a separate form, and you complete one form per S corporation if you own stock in more than one.²

Gather Your Records First

Pull these before you open the form:

Your prior year’s Form 7203, or your own basis records if you weren’t required to file one. Line 15 from last year’s form is line 1 on this year’s.
Your Schedule K-1 (Form 1120-S) from the corporation. Nearly every line on Form 7203 pulls from it, especially Box 1 (ordinary income or loss), Box 2 (rental real estate income or loss), and Box 16, code D (distributions).³
Records of any cash or property you contributed during the year for additional stock.
Promissory notes, open-account balances, and repayment records for any loans you personally made to the corporation.

Don’t overlook tax-exempt income shown on the K-1. It increases stock basis even though it never appears on your taxable income.

Apply Basis Adjustments in the Required Order

Before filling in line items, understand the sequence the form is built around. Adjustments must be applied in this order:²

Increase basis for income items (including tax-exempt income and excess depletion).
Decrease basis for non-dividend distributions. Basis cannot drop below zero at this step; anything above your remaining basis becomes capital gain.
Decrease basis for nondeductible expenses and oil and gas depletion. Basis cannot drop below zero.
Decrease basis for losses and deductions. Basis cannot drop below zero; anything unused carries forward.

The form’s layout follows this order, so completing it line by line naturally enforces the sequence. Applying losses before distributions, or skipping the nondeductible expense step, will change every number downstream and can turn what should be a tax-free distribution into a taxable gain.

Part I: Stock Basis, Line by Line

Part I runs from line 1 through line 15.⁴

Line 1 is your stock basis at the start of the corporation’s tax year. Pull it from line 15 of last year’s Form 7203, or from your own records.

Line 2 captures additional capital contributions or new stock purchases during the year.

Lines 3a through 3m are the income and increase items from your K-1. The ones most filers use:

Line 3a: ordinary business income from K-1 Box 1. Losses go to Part III instead, not here.
Line 3b: net rental real estate income from K-1 Box 2. Again, losses go to Part III.
Line 3g: net capital gains (losses go to Part III).
Line 3k: tax-exempt income.

Line 4 totals all the increases. Line 5 adds lines 1, 2, and 4 to give stock basis before distributions.

Line 6 is non-dividend distributions from K-1 Box 16, code D. Line 7 subtracts line 6 from line 5. If the result is zero or less, enter zero, skip lines 8 through 14, and put zero on line 15.

Lines 8a through 8c handle nondeductible expenses, oil and gas depletion, and certain business credit recaptures. Line 10 subtracts them from line 7. If line 10 is zero or less, put zero on line 15 and stop; there’s no basis left to absorb losses.

Line 11 brings in the allowable loss amount from Part III. Line 15 is your ending stock basis for the year and becomes line 1 next year.

Part II: Debt Basis, and What Doesn’t Count

Skip Part II entirely unless you personally loaned money to the S corporation from your own funds. A loan the corporation took from a bank does not give you debt basis, even if you personally guaranteed it.⁵ A guarantee creates basis only if and when you actually make a payment on the guaranteed debt.

Part II splits into two sections. Section A (lines 16 through 20) tracks the face amount of each loan: line 16 for the opening balance, line 17 for new loans, line 19 for principal repayments. Use a separate column for each loan if you have more than one.²

Section B (lines 21 through 34) tracks the tax basis of those loans, which can be lower than the face amount if prior-year losses reduced debt basis. Line 21 is opening debt basis. Line 23 handles basis restoration: when the corporation’s income for the year exceeds its losses and deductions, that “net increase” restores previously reduced debt basis before anything flows back up to stock basis. Line 30 applies loss and deduction amounts that exceeded stock basis, reducing your debt basis proportionally across all loans.

If the corporation repays a loan when your debt basis is lower than the loan balance, you have taxable gain on the difference. A formal promissory note produces capital gain (Form 8949 and Schedule D); open-account debt produces ordinary income (Form 4797).²

Part III: How Much Loss You Can Actually Deduct

Part III determines how much of the corporation’s losses your basis can absorb this year.⁴ Lines 35 through 46 list every loss and deduction category from the K-1:

Line 35: ordinary business loss
Line 36: net rental real estate loss
Line 38: net capital loss
Line 41: Section 179 deductions
Line 42: charitable contributions
Line 43: investment interest expense
Line 46: foreign taxes paid or accrued

Each line has four columns. Column (a) is the total loss from the K-1. Column (b) is any prior-year carryover previously suspended for insufficient basis. Column (c) is the portion allowable against remaining stock basis (from line 10). Column (d) is the portion allowable against debt basis. Line 47 totals everything. The column (c) figure flows back to line 11 in Part I, and the column (d) figure flows to line 30 in Part II.

Any loss exceeding your combined stock and debt basis carries forward indefinitely. You’ll enter it in column (b) on next year’s Form 7203, ready to deduct once you have basis to absorb it.²

Distributions That Go Above Your Stock Basis

A non-dividend distribution is tax-free only up to your stock basis. Debt basis doesn’t count for this test; only stock basis matters.⁶ Anything above your stock basis is treated as gain from the sale of property, generally a capital gain.⁷

Your K-1 reports the distribution amount but does not tell you what portion is taxable. That determination lives on Form 7203, which is why the Part I calculation matters even in years when the K-1 looks straightforward.

Basis Is Only the First Hurdle

Passing the basis test on Form 7203 does not automatically mean you can deduct the loss. The IRS applies up to three limits in sequence:

First, the basis limit on Form 7203. Losses cannot exceed combined stock and debt basis.⁸
Second, the at-risk limit on Form 6198. Losses can only be deducted to the extent you’re personally at risk.
Third, the passive activity limit on Form 8582. If you don’t materially participate in the S corporation activity, surviving losses can only offset passive income.⁹

Anything still standing after those three can then face the excess business loss limitation under Section 461(l), calculated on Form 461.

Attaching and Filing the Form

Form 7203 attaches to your Form 1040.⁴ E-file software handles the attachment automatically. On paper, place it behind the main return and supporting schedules. The deadline is the same as your 1040: April 15 for calendar-year filers, or October 15 with a Form 4868 extension.¹⁰ An extension buys filing time, not payment time; tax on S corporation income or on gain from distributions above basis is still due April 15.

Check your Social Security Number and the corporation’s EIN before submitting. Mismatched IDs cause automatic processing rejections. Keep a copy: your line 15 ending stock basis and Part II ending debt basis are the starting figures for next year.

Mistakes That Draw IRS Attention

Counting a loan you guaranteed as debt basis. Only a direct loan from your own funds counts. This is the single most common basis error.
Applying the four adjustment steps in the wrong order. Every number downstream will be off.
Deducting losses when combined stock and debt basis is zero. Those losses carry forward; they can’t be taken now.
Treating a K-1 distribution as fully tax-free without checking it against your stock basis.
Failing to track basis in a year when Form 7203 wasn’t required. Gaps are hard to reconstruct and nearly impossible to defend under audit.

The current version is the December 2022 revision, available as a fillable PDF on the IRS website with the line-by-line instructions published separately. If this is your first time completing the form, keeping the instructions open next to it is worth the time.

1
Internal Revenue Service. Instructions for Form 7203 – S Corporation Shareholder Stock and Debt Basis Limitations
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Internal Revenue Service. Instructions for Form 7203 S Corporation Shareholder Stock and Debt Basis Limitations
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Internal Revenue Service. Schedule K-1 (Form 1120-S) Shareholder’s Share of Income, Deductions, Credits, etc.
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Internal Revenue Service. IRS Form 7203 – S Corporation Shareholder Stock and Debt Basis Limitations
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Office of the Law Revision Counsel. 26 U.S. Code 1367 – Adjustments to Basis of Stock of Shareholders, Etc.
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Internal Revenue Service. S Corporation Stock and Debt Basis
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Office of the Law Revision Counsel. 26 U.S. Code 1368 – Distributions
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Office of the Law Revision Counsel. 26 U.S. Code 1366 – Pass-Thru of Items to Shareholders
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Internal Revenue Service. Instructions for Form 8582 Passive Activity Loss Limitations
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Internal Revenue Service. When to File