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

Your S corporation basis is the running tally of what you have invested in the company, and it controls two things on your tax return: how much of the corporation’s losses you can actually deduct, and whether the cash the company pays you is tax-free. Basis has two parts. Stock basis reflects what you put in for your shares, adjusted each year for the company’s activity. Debt basis reflects money you personally loaned to the corporation. You track both yourself; the corporation does not do it for you.

Where Your Stock Basis Starts

Your starting number depends on how you got the shares.

Bought for cash: basis equals what you paid, including transaction costs.
Contributed property for stock: basis generally equals your basis in the property you gave up. If the corporation assumed a liability on that property and the liability exceeded your basis, you recognize the excess as taxable gain.
Received as a gift: you take the donor’s basis (carryover). A portion of any gift tax paid may increase it.
Inherited: basis is generally stepped up to fair market value on the date of death, reduced to the extent the value represents income in respect of a decedent.¹

Document the starting figure carefully. If the IRS later questions a loss deduction or the treatment of a distribution, you carry the burden of proving basis, and that proof begins here.

Adjusting Basis Each Year, In the Right Order

Once you have a starting number, you adjust it every year for the corporation’s activity on your Schedule K-1. Treasury regulations require a specific sequence, and the sequence is where many shareholders go wrong.²

Increase for your share of all income items, including ordinary business income, separately stated items like capital gains and interest, and tax-exempt income.
Decrease for non-dividend distributions received during the year. Basis cannot go below zero from distributions.
Decrease for non-deductible, non-capital expenses, such as the disallowed portion of meals or penalties.
Decrease for your share of losses and deductions, including ordinary business loss, capital losses, and charitable contributions. Basis cannot go below zero from losses.

Notice the trap built into this order. Distributions come out in Step 2, before losses are applied in Step 4. A large distribution in a loss year can consume the basis that would otherwise have supported a loss deduction, leaving you with a suspended loss you could have used if you had taken less cash.³

When Losses Exceed Basis

If your stock basis hits zero in Step 4, the unused losses are not gone. They suspend and carry forward, keeping their original character, and you can deduct them in any later year when new income or additional investment restores basis.⁴

Non-deductible expenses from Step 3 work differently. Any amount that exceeds remaining basis is permanently lost. It does not suspend and it does not carry forward. If the corporation incurs significant non-deductible expenses in a low-basis year, that basis reduction never comes back.

Debt Basis: A Second Pool for Losses

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

The “directly” requirement is strict. Guaranteeing a bank loan to the corporation creates no debt basis, even if you pledge personal collateral, because a guarantee involves no actual economic outlay until you are called on to pay. The loan has to run from you to the corporation, documented with a real obligation to repay.

Losses apply to stock basis first. Only after stock basis reaches zero do remaining losses reduce debt basis, which itself can never go below zero.

How Debt Basis Is Restored, and the Repayment Trap

When the corporation has a net increase in a later year (income items exceeding losses, deductions, non-deductible expenses, and distributions), that net increase first restores any reduced debt basis, up to the original face amount of the loan, before it rebuilds stock basis.⁵

The restoration order creates a real risk. If the corporation repays your loan while debt basis is still reduced below the repayment amount, the difference is taxable income to you. With a written instrument like a formal promissory note, that gain is capital. Without one, it is ordinary.⁴

When Distributions Become Taxable

Whether a cash distribution is tax-free depends on your stock basis and on whether the corporation carries accumulated earnings and profits from years it operated as a C corporation. Debt basis does not shelter distributions; only stock basis does.

Always Been an S Corporation

Distributions are tax-free up to your stock basis and reduce it dollar for dollar. Any amount beyond remaining stock basis is treated as gain from the sale of stock, usually capital gain.⁴

Converted From a C Corporation

If the company has accumulated C corporation earnings and profits (E&P), distributions follow a three-tier order, tracked through the corporation’s Accumulated Adjustments Account (AAA) on Schedule M-2 of Form 1120-S:⁶

First, from AAA, tax-free up to stock basis.
Next, from accumulated C corporation E&P, taxable as a dividend.⁷
Then from any remaining stock basis, tax-free, with anything beyond that treated as capital gain.

The tier rule exists so that old C corporation earnings cannot be pulled out tax-free just because the company later elected S status. If your corporation was ever a C corporation, the AAA and E&P balances deserve close attention.

Basis Is Only the First Loss Hurdle

Even when basis supports a loss, three more limitations can block it, applied in order.⁸

At-risk limitation (Form 6198): losses are capped at the amount you have at risk in the activity. For shareholders who invested cash or took personal recourse loans, this tracks closely with basis. It bites when nonrecourse or leveraged financing is involved.⁹
Passive activity limitation (Form 8582): if you do not materially participate in the business, losses can only offset passive income, not wages or portfolio income.
Excess business loss limitation (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 converted into a net operating loss carryforward. The thresholds adjust annually for inflation.

A loss blocked at any stage carries forward under that stage’s rules. A loss suspended at the at-risk level stays suspended there until your at-risk amount increases, regardless of what your stock basis is doing.

Selling Your Stock or Ending the S Election

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

If the corporation’s S election terminates instead, you get a limited window called the post-termination transition period (PTTP). It generally runs for one year after the last day of the corporation’s final S year, or until the extended due date of that final S return, whichever is later.¹⁰ During the PTTP, suspended losses from the final S year can be deducted against your stock basis as of the end of the period (debt basis does not count here),¹¹ and cash distributions remain tax-free to the extent of stock basis. When the PTTP closes, both benefits expire.

Reporting Basis on Form 7203

Form 7203 is where you report your stock and debt basis calculations to the IRS. You must file it with your individual return whenever you:

Claim a loss from the S corporation, including suspended losses from a prior year
Receive a non-dividend distribution
Dispose of any S corporation stock
Receive a loan repayment from the corporation

Even in years when nothing triggers filing, the IRS recommends completing and keeping the form so you don’t have to reconstruct years of history later.⁸ Your ending basis on each year’s form becomes the starting basis on the next.¹²

The corporation tracks AAA, E&P, and its other corporate-level accounts on Form 1120-S. Your personal stock and debt basis is yours to maintain. If you use a tax preparer, make sure they have your prior-year Form 7203 or equivalent worksheets. Rebuilding basis from scratch after several years is expensive, slow, and sometimes impossible if records are gone.

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