S Corporation Basis: Stock, Debt, Distributions, and Form 7203

Your S corporation basis is a running measure of what you’ve put into the company, and it sets two hard limits on your personal tax return: how much of the corporation’s losses you can actually deduct, and how much of any distribution you can receive tax-free. Because an S corporation passes its income, losses, deductions, and credits through to shareholders instead of paying tax at the entity level, everything that lands on your return has to pass through your basis first. Keep the number accurate every year, or you’ll either lose deductions you’re entitled to or trigger tax on distributions you thought were free.

Where Your Basis Starts

Your opening number depends on how you got the stock.

Bought for cash: basis equals what you paid, including transaction costs.
Contributed property in exchange for stock: basis generally carries over from the property. If the corporation assumes a liability attached to that property and the liability exceeds your basis in the property, the excess is taxable gain.
Received as a gift: you take the donor’s basis. A portion of any gift tax the donor paid can add to it.
Inherited: basis is generally stepped up to fair market value at the date of death, reduced for any income in respect of a decedent baked into the share value.¹

Whatever the starting figure is, keep the records that prove it. If the IRS challenges a loss or the tax treatment of a distribution years from now, the burden is on you.

The Annual Adjustment, in Order

Once you have a starting number, you adjust it every year in a specific sequence set by the regulations.² Change the order and you get the wrong answer.

Increase for income. Add your share of every income item on the Schedule K-1: ordinary business income, separately stated items like capital gains and interest, and tax-exempt income such as municipal bond interest. Tax-exempt income increases basis so that distributions funded by it stay tax-free.
Decrease for distributions. Subtract non-dividend distributions received during the year. Basis cannot go below zero from distributions.
Decrease for non-deductible, non-capital expenses. Subtract items like the non-deductible half of meals or penalties.
Decrease for losses and deductions. Subtract ordinary business losses, capital losses, charitable contributions, and other K-1 deduction items. Basis cannot go below zero from losses either.

The ordering has a real consequence. Distributions come out in Step 2 before losses reach Step 4, so a large distribution in a loss year can consume basis that would otherwise have supported a deduction. Many shareholders assume it’s the other way around.³

When Losses Suspend and When They Vanish

If Step 4 drives your basis to zero, the leftover losses don’t disappear. They suspend and carry forward, keeping their original character, and become deductible in any later year when new income or new investment restores basis.⁴

Non-deductible expenses from Step 3 behave differently. Any portion that exceeds your remaining basis is permanently lost. It does not carry forward the way a suspended loss does.

Debt Basis: A Second Pool for Losses

If stock basis runs out and you still have suspended losses, debt basis can unlock more of them. Debt basis exists only when you personally lend money directly to the corporation. Its initial amount equals the face of the loan.⁴

“Directly” is strict. Guaranteeing a bank loan to the corporation does not create debt basis, even if you pledge personal collateral. The obligation has to run from you to the corporation, ordinarily documented by a promissory note showing a real duty to repay. A guarantee involves no actual economic outlay by the shareholder unless and until the guarantor is called on, and that disqualifies it.

Borrowing from a bank personally and then re-lending to the corporation can produce debt basis, but only if the two transactions are genuinely separate. If they’re structured as a single pre-arranged step, the IRS and the courts can collapse them and treat the bank as the real lender to the corporation, leaving you with no debt basis.

How Losses Hit Debt Basis

Losses always drive stock basis to zero first. Only then do they start reducing debt basis, which itself cannot go below zero.⁴

Restoration and the Loan-Repayment Trap

When the corporation has a net income year, that income restores debt basis before it rebuilds stock basis. The “net increase” for this purpose is income items minus all decrease items for the year (losses, deductions, non-deductible expenses, and distributions). Restoration continues until debt basis is back to the loan’s face amount.⁵

Here’s the trap. If the corporation repays your loan while debt basis is still reduced below the repayment amount, the difference is taxable to you. With a written instrument like a formal promissory note, it’s capital gain. Without one, it’s ordinary income.⁴

Distributions and Basis

For a corporation that has always been an S corporation, distributions are tax-free up to your stock basis and reduce it dollar for dollar. Anything beyond stock basis is treated as gain from the sale of stock, typically capital gain. Debt basis is not considered in this test.⁴

If your corporation used to be a C corporation and still carries accumulated earnings and profits from those years, the rules change. Distributions then flow through a three-tier order tracked on the corporation’s Accumulated Adjustments Account: first out of AAA (tax-free up to stock basis), then out of the old C corporation earnings and profits (taxable as a dividend), then out of any remaining stock basis (tax-free), and finally as capital gain.⁶⁷ If your company ever operated as a C corporation, those account balances deserve close attention.

Other Limits That Can Still Block a Loss

Clearing basis is only the first hurdle. The IRS runs a loss through four limitations in order, and a loss that survives one can still be blocked by the next.⁸

Basis limitation on Form 7203, as described above.
At-risk limitation on Form 6198. Losses that pass the basis test are then capped at the amount you have “at risk.” For shareholders who invested cash or took recourse loans, this usually tracks basis closely; the rule bites when nonrecourse or leveraged financing is involved.⁹
Passive activity limitation on Form 8582. If you don’t materially participate, losses are passive and can only offset passive income. They cannot reduce wages or portfolio income.
Excess business loss limitation on Form 461. For 2025, aggregate net business losses above $313,000 (single) or $626,000 (married filing jointly) are disallowed for the current year and become a net operating loss carryforward. The thresholds adjust annually.

A loss blocked at any stage carries forward under that stage’s own rules. A loss stuck at the at-risk level, for instance, stays stuck there until your at-risk amount grows, even if stock basis is fine.

Selling Stock or Ending the S Election

If you sell all your S corporation stock while you still have suspended losses from the basis limitation, those losses are gone. They do not transfer to the buyer, and they do not convert into a capital loss on the sale.⁴

If the S election itself terminates, a window called the post-termination transition period opens. It generally runs one year after the last day of the final S corporation tax year, or through the extended due date of that final return, whichever is later.¹⁰ During that window, suspended losses from the final S corporation year can be deducted against your stock basis as of the end of the period (only stock basis counts here, not debt basis), and cash distributions during the window remain tax-free returns of capital up to your remaining stock basis.¹¹ Once the window closes, both benefits expire.

Tracking It on Form 7203

Form 7203 is where you show the IRS your stock and debt basis calculations. You must file it with your individual return in any year you:

Deduct a share of an S corporation loss, including a suspended loss from a prior year;
Receive a non-dividend distribution;
Dispose of S corporation stock; or
Receive a loan repayment from the corporation.

Even in years without a trigger, the IRS recommends filling out the form and keeping it. Updating year by year is far cheaper than reconstructing basis after several years of operations.⁸

The form has three parts: stock basis, debt basis, and the allowable loss computation after the basis limitation is applied. Line 1 starting stock basis should match the prior year’s ending figure, or your initial basis if this is your first year filing it. Each K-1 item that changes basis has a corresponding line, so the form also works as a cross-check against your Schedule K-1.¹²

The corporation does not track your basis for you. It tracks corporate-level accounts like the AAA and E&P on Form 1120-S, but your personal stock and debt basis is yours to maintain. If you use a preparer, hand them the prior-year Form 7203 or equivalent worksheet. Records that go missing are sometimes impossible to rebuild, and the consequence, in an audit or on a loss year, falls on you.

1
Office of the Law Revision Counsel. 26 U.S. Code 1014 – Basis of Property Acquired From a Decedent
2
GovInfo. 26 CFR 1.1367-1 – Adjustments to Basis of Shareholder’s Stock in an S Corporation
3
Internal Revenue Service. Stock Basis Ordering Rules
4
Internal Revenue Service. S Corporation Stock and Debt Basis
5
Internal Revenue Service. Instructions for Form 7203
6
Internal Revenue Service. Instructions for Form 1120-S (2025) – Section: Schedule M-2
7
eCFR. 26 CFR 1.1368-2 – Accumulated Adjustments Account (AAA)
8
Internal Revenue Service. Instructions for Form 7203
9
Office of the Law Revision Counsel. 26 U.S. Code 465 – Deductions Limited to Amount at Risk
10
eCFR. 26 CFR 1.1377-2 – Post-Termination Transition Period
11
Office of the Law Revision Counsel. 26 U.S. Code 1366 – Pass-Thru of Items to Shareholders – Section: (d)(3)
12
Internal Revenue Service. About Form 7203, S Corporation Shareholder Stock and Debt Basis Limitations