IRC 1367: S Corporation Stock Basis Adjustments and Form 7203

S corporation stock basis adjustments are the annual increases and decreases a shareholder applies to the tax-adjusted value of their shares under Internal Revenue Code Section 1367. Each year, your share of the corporation’s income raises basis, and your share of distributions, nondeductible expenses, and losses reduces it, in a specific order the regulations prescribe.¹ Get the running total right and losses flow through cleanly, distributions come out tax-free, and a future sale reports the correct gain. Get it wrong and any of those three can go sideways.

What Basis Actually Controls

Three tax outcomes turn on basis. First, it caps your loss deductions: you can deduct your share of S corporation losses only up to the combined total of your stock basis and any debt basis you hold, with anything beyond that suspended until basis recovers.² Second, it decides whether distributions are tax-free. Cash or property you receive is not taxed to the extent it stays within stock basis.³ Third, when you sell your shares, basis is subtracted from the sale price to arrive at your capital gain or loss.⁴

Because the number moves every year, it needs to be recomputed every year. Waiting until a sale or a large distribution forces you to reconstruct a decade of adjustments is the expensive way to do it.

Your Starting Basis

Where you begin depends on how you got the stock. If you bought shares from another owner, initial basis is what you paid.⁵

If you received stock in a tax-free formation under Section 351, basis equals the cash you contributed or the adjusted basis of the property you transferred, reduced by any liabilities the corporation assumed from you.⁶ Adjusted basis of contributed property is generally what you paid for it, less any depreciation claimed before the contribution.

Inherited stock takes a basis equal to fair market value on the date of the decedent’s death, or the value six months later if the estate elected alternate valuation.⁷ That step-up can substantially reduce the gain an heir recognizes on a later sale.

Items That Increase Basis Each Year

Every income item that passes through from the corporation increases your stock basis, whether it appears as a separately stated item on your Schedule K-1 (interest income, capital gains, and similar categories) or is folded into ordinary business income.¹

Tax-exempt income counts too. Your share of items like municipal bond interest flows through as a separately stated K-1 item and adds to basis even though it does not add to taxable income.⁸ The reason is practical: if tax-exempt earnings did not raise basis, distributing them later would push the shareholder past their basis and manufacture taxable gain out of tax-free income.

A smaller category also increases basis: the excess of depletion deductions over the basis of the property being depleted.¹

Items That Decrease Basis Each Year

Several categories pull basis down. Stock basis never drops below zero from these reductions; any excess either spills into debt basis or is suspended, depending on the item.

Distributions. Cash or property you receive from the corporation reduces your stock basis to the extent it is not already included in income. For an S corporation without accumulated earnings and profits from a prior C corporation period, distributions come out tax-free up to basis and reduce it dollar for dollar.³

Nondeductible, noncapital expenses. Your share of expenses the corporation cannot deduct and cannot add to the cost of an asset reduces basis. Typical examples are the nondeductible portion of meals, penalties, and political contributions. Charitable contributions made by the corporation also reduce basis by their full amount, even when your personal deduction for the contribution is limited at the individual level.⁴

Losses and deductions. Ordinary business losses, capital losses, and every separately stated deduction item reduce basis. Section 179 expense passes through the same way and reduces stock basis in the year it is claimed.¹

The Required Order of Adjustments

The sequence is not optional. Treasury regulations set out four steps, and running them in the wrong order can change both how much of a distribution is tax-free and how much loss you can deduct in the year.⁹

Step 1 — Increase for income. Add your share of all income items, taxable and tax-exempt, plus any excess depletion.
Step 2 — Decrease for distributions. Subtract non-dividend distributions received during the year, but not below zero.
Step 3 — Decrease for nondeductible expenses. Subtract your share of nondeductible, noncapital expenses and any oil and gas depletion deduction.
Step 4 — Decrease for losses and deductions. Subtract your share of all loss and deduction items, but not below zero.

Income runs first so that current-year earnings build enough basis for distributions to come out tax-free in step 2. Distributions come off before losses so a shareholder who receives both a distribution and a share of losses in the same year can still deduct as much loss as basis allows.¹⁰

Electing to Take Losses Before Nondeductible Expenses

The default order can work against you in a year with both deductible losses and nondeductible expenses. Nondeductible expenses run in step 3, ahead of losses in step 4, so they can consume basis that would otherwise support a deductible loss. You lose current-year deduction room to expenses that were never going to help you.

The regulations let you elect an alternative order that runs losses and deductions before nondeductible expenses. In exchange, any nondeductible expenses that exceed your remaining basis carry forward to the next year instead of vanishing. The election is made by attaching a statement to a timely filed return, and once made it applies to that S corporation until the IRS permits revocation.⁹

Take a shareholder sitting at $300 of stock basis after income increases, with $75 of nondeductible expenses and $500 of ordinary losses. Default order: the $75 reduces basis to $225, the loss deduction is capped at $225, and $275 of loss is suspended. Elective order: the full $300 supports losses, allowing a $300 deduction, and the $75 of nondeductible expenses carries forward. The $75 difference in current-year deductions is real money.

Debt Basis Sits in a Separate Pool

Debt basis is a second pool that exists only when a shareholder has personally loaned money to the corporation. Once stock basis reaches zero, losses that would otherwise be suspended can instead reduce debt basis.¹

Only direct loans from the shareholder to the corporation create debt basis. Guaranteeing a bank loan the corporation takes out does not, even if you are personally on the hook when the corporation defaults.⁴ This is one of the most common and costly misunderstandings in S corporation taxation, and it regularly costs shareholders loss deductions on audit.

When losses reduce your debt basis, a later repayment of the loan produces gain to the extent the repayment exceeds your reduced basis in the debt. If the loan was documented with a written note, the gain is capital; on an informal open-account loan, it is ordinary. The statute also provides a restoration rule: in any later year the corporation has net income, that income rebuilds debt basis before it raises stock basis.¹ Keeping the company modestly profitable before repaying such a loan can shrink or eliminate the resulting tax hit.

When a Distribution Exceeds Your Stock Basis

Distributions are tax-free only up to stock basis. Anything above is treated as gain from the sale of property, generally capital gain, with long-term treatment depending on how long you have held your shares.³

Distributions only reduce stock basis, never debt basis. A large personal loan to the corporation does not cushion a distribution that runs past stock basis.⁴ Shareholders who assume otherwise are often surprised by the capital gain on their return.

If the corporation carries accumulated earnings and profits from a prior C corporation period, the distribution rules are more layered: a portion may be a taxable dividend to the extent of those earnings and profits, with the rest following the basis-reduction and capital-gain rules above.

Tracking the Number and Filing Form 7203

Tracking basis is the shareholder’s job, not the corporation’s. The K-1 you receive each year reports your share of income, losses, and distributions, but it does not calculate basis.⁴ A K-1 showing a loss does not, by itself, entitle you to deduct that loss; you have to show basis to support it.

The IRS requires the calculation on Form 7203 (S Corporation Shareholder Stock and Debt Basis Limitations) in any year you:

Claim a deduction for your share of an S corporation loss, including a loss carried forward from a prior year
Receive a non-dividend distribution
Sell or otherwise dispose of your stock
Receive a loan repayment from the corporation

Form 7203 walks the calculation through in order: beginning basis, increases, decreases, distribution treatment, and the loss limitation. It attaches to your individual return.¹⁰ Even in years when the form is not required, keeping the same running computation in your files is what prevents a scramble later, when the number matters most.

1
Office of the Law Revision Counsel. 26 USC 1367 – Adjustments to Basis of Stock of Shareholders
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Office of the Law Revision Counsel. 26 USC 1366 – Pass-Thru of Items to Shareholders
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Office of the Law Revision Counsel. 26 USC 1368 – Distributions
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Internal Revenue Service. S Corporation Stock and Debt Basis
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Office of the Law Revision Counsel. 26 USC 1012 – Basis of Property
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Office of the Law Revision Counsel. 26 USC 358 – Basis to Distributees
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Office of the Law Revision Counsel. 26 USC 1014 – Basis of Property Acquired From a Decedent
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eCFR. 26 CFR 1.1366-1 – Shareholder’s Share of Items of an S Corporation
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eCFR. 26 CFR 1.1367-1 – Adjustments to Basis of Shareholder’s Stock in an S Corporation
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Internal Revenue Service. Instructions for Form 7203