Short answers
What is S corporation stock basis?
It is the running total of what the stock has cost you, net of what the company has earned, lost and paid out to you. It starts at what you paid for the stock, plus any capital you put in, goes up with your share of the company's income, and goes down with distributions, losses and nondeductible expenses, but never below zero.
When does an S-corp owner have to file the basis form?
The IRS requires Form 7203 from a shareholder who claims a loss, receives a non-dividend distribution, disposes of stock, or is repaid a loan by the company. Most owners who pay themselves distributions fall in the second group every year. In a year with none of the four, the IRS still suggests completing and keeping the form so the numbers never have a gap.
What does basis tracking need from the bookkeeping?
Excite Tax's short list: capital contributions, distributions and shareholder loans each in their own accounts, per shareholder, and nondeductible expenses kept apart from deductible ones. Those are the lines the basis calculation reads. The full list is below.
What is a good bookkeeping strategy for an S corp?
Excite Tax's answer: run owner pay through payroll, take everything else as a recorded distribution from a business-only bank account, close the books monthly, and roll basis forward the day the return is done. The steps are below.
What happens if my distributions are more than my basis?
A distribution from an S corporation with no old C-corporation earnings is not income up to your stock basis. The excess is taxed as gain from a sale of property, which the Form 7203 instructions say to report on Form 8949 and Schedule D. A worked illustration is below.
What happens to a loss my basis cannot absorb?
It waits. The loss you can deduct is capped at your stock basis plus your basis in loans you made to the company, and the rest carries forward to the next year, with no time limit. It comes back only when basis does, so the carryover belongs in the basis records too.
Basis is the number that decides two things on an S-corp owner's personal return: whether a distribution is tax-free and whether a loss is deductible. It changes every year, because stock basis in an S corporation changes every year and must be computed every year. It is also yours to keep: the IRS says tracking it is not the corporation's responsibility but the shareholder's.
The company's Schedule K-1 does not do it for you. The K-1 shows the distribution amount but does not state how much of it is taxable; that depends on a basis figure only the owner's records hold. Clean books are where that figure comes from.
The IRS sets an ordering rule, applied as of the last day of the S corporation's year:
- Add your share of income and excess depletion.
- Subtract non-dividend distributions (second in the order).
- Subtract nondeductible expenses, such as penalties and the nondeductible part of meals (expenses not deductible and not chargeable to capital).
- Subtract losses and deductions last (the fourth step).
The order is why a loss year does not automatically make distributions taxable: distributions are measured against basis before the year's losses come off. It is also why the year's distribution total has to be complete. A distribution the books missed does not disappear; it shows up later as a basis figure that is too high.
The IRS's own example, a sole shareholder with no debt basis, shows every step (IRS stock basis example):
The whole $12,000 distribution is tax-free, because it came off the $19,000 before any loss. Only $4,800 of the $20,000 ordinary loss is deductible that year; the other $15,200 is suspended and carries forward.
Every number in that table came from the bookkeeping: the distribution total from the distributions account, the nondeductible expenses from their own expense lines, the loss from a closed profit-and-loss statement. If any of those accounts is mixed with something else, the basis figure is wrong in the same direction.
When distributions run past basis
An illustration, not a client: a Provo owner starts the year with $10,000 of basis, carried from last year's ending figure, the K-1 shows $15,000 of ordinary income, and the owner took $30,000 out during the year (income is added first).
Basis before distributions is $25,000, so $25,000 of the distributions is not income, because it does not exceed basis. The remaining $5,000 is gain from a sale of property, reported on Form 8949 and Schedule D, and basis ends the year at zero, because it cannot go below zero.
The owner who finds this out in March has no fix left for that year. The owner whose books show the distribution account running ahead of income in October can stop taking money out, or run more of it through payroll.
- Capital contributions, in an equity account per shareholder. Contributions to capital increase stock basis; loans do not go on that line, so money put in has to be labelled as one or the other when it arrives.
- Distributions, in their own equity account per shareholder, including company money spent on personal bills. Those are distributions too, and they reduce basis the same way.
- Owner wages through payroll, as wages. A paycheck booked as a distribution, or a distribution booked as wages, moves both the payroll filings and the basis figure.
- Shareholder loans, each with its written note and its own liability account. The Form 7203 instructions require each formal note to be tracked separately, and an unwritten open account over $25,000 at year-end is treated as a formal note from the next year.
- Nondeductible expenses (penalties, the nondeductible part of meals, and similar) in their own accounts, because they reduce basis even though they are not deducted.
- Keep one business-only bank account, so every transfer to an owner is visible and can be booked as a distribution. See keeping business and personal money apart.
- Set up the equity and loan accounts per shareholder on day one: contributions, distributions, and one account per shareholder loan.
- Close the books every month (monthly close), and compare year-to-date distributions with year-to-date income before each owner draw.
- When the return is done, roll each shareholder's basis forward from the K-1 and file the schedule with the return; next year's opening basis should equal this year's ending basis.
- Keep every year's basis schedule. Records relating to a form must be kept as long as their contents may become material, and basis matters until the last share is sold.
Money you lend the company gives you debt basis, which can absorb losses once stock basis is used up: the loss limit is stock basis plus the basis of the company's debt to you. It does not help with distributions: a distribution's taxability looks solely at stock basis, and distributions don't reduce loan basis.
Two traps follow. A bank loan you personally co-sign is not your loan to the company: co-signed loans aren't part of loan basis until you actually make a payment on one. And once losses have reduced debt basis, repaying that loan to you can be partly or fully taxable; later net income restores debt basis before it adds to stock basis. The loan ledger has to show both the balance owed and the basis left in it.
A loss that clears basis still has to pass three more tests, in this order: the at-risk limits, the passive activity loss limits and the excess business loss limit. Basis comes first, and it is the one the bookkeeping controls.
What if nobody has tracked basis since the company started?
Rebuild it from the first year forward: the stock cost or first capital contribution, then each year's income, losses and distributions from the company's returns, in the order above. Each year's opening figure should equal the prior year's ending basis, so a single missing year breaks every year after it. Old bank statements prove the contributions and distributions the company's returns do not show.
My company was a C corporation before it elected S status. Does anything change?
My spouse and I both own shares. Is one calculation enough?
No. Basis is per shareholder: each spouse completes a separate Form 7203 even on a joint return, so the books need contributions, distributions and loans split by owner.
Hand the books over when keeping them costs more hours than the business can spare, or when they stop agreeing with the bank.
Excite Tax keeps these books; the return they feed is reviewed and signed by a licensed CPA at TBD CPA LLC.
- IRS, Instructions for Form 7203 (Rev. December 2022), S Corporation Shareholder Stock and Debt Basis Limitations · retrieved September 2026
- IRS, S corporation stock and debt basis (page updated June 7, 2026) · retrieved September 2026
- 26 U.S.C. § 1367, Adjustments to basis of stock of shareholders, etc. · retrieved September 2026
- 26 U.S.C. § 1368, Distributions · retrieved September 2026
- 26 U.S.C. § 1366, Pass-thru of items to shareholders · retrieved September 2026
Ranked and explained on the sources page.