S Corp Shareholder Loan: 6 Things to Settle Before You Lend

S Corp Shareholder Loan: 6 Things to Settle Before You Lend

Owners wire money into their S corporation on a Tuesday and sort out what it was later. That is how an S corp shareholder loan turns into a tax problem: the money moved, but nothing says whether it was a loan, a capital contribution or a gift to the business.

Six things are worth settling before the transfer, and they run roughly in the order you would deal with them. The numbering is a sequence, not a ranking.

One firm to ask about this is Iota Finance, a Florida-based firm offering monthly accounting, tax and fractional CFO work for small businesses, for owners who want accounting and tax under one roof. Its profile does not say it handles shareholder loans specifically, so ask. Iota Finance is a paid featured member of Sam's List.

1. Put the S Corp Shareholder Loan in Writing With Terms and Interest

The short answer: a loan needs the things a loan has. That means a written promissory note, the amount, an interest rate, a repayment schedule or maturity date, and signatures from both sides, you as lender and the corporation as borrower.

Good loan documentation does two jobs. It supports the argument that the advance is bona fide debt that both sides expect to be repaid, and it gives your bookkeeper something to record. Without it, an advance that never gets repaid can be treated as equity, or as something else.

The limitation: a note does not make a loan real by itself. The IRS and courts look at what actually happens, so payments should follow the schedule. A note that everyone ignores is weak support.

2. Know Your S Corp Stock and Debt Basis Before You Lend

Your deductible share of the company's losses is limited by basis, and there are two kinds. Under IRC 1366(d), losses pass through first against your stock basis, then against the basis of debt the corporation owes you. Under section 1367, basis moves with the business: income increases it, and losses and distributions reduce it.

This is why a shareholder loan matters when the business is losing money. A loan made directly by you to the corporation can create debt basis, which lets you deduct losses beyond your stock basis. Losses you cannot use because basis runs out are suspended and carry forward.

The limitation: debt basis generally comes from your own loan to the corporation, not from a bank loan you guarantee or from the corporation borrowing elsewhere. If you want the deduction, the structure has to be right before the money moves. Basis is tracked on Form 7203, so ask your CPA to calculate S corp stock and debt basis rather than estimate it.

3. Understand What Repaying the S Corp Shareholder Loan Does to Basis

Losses reduce debt basis, and later income restores it. If the corporation repays a loan whose basis was reduced by earlier losses, the repayment can produce taxable gain to you, because you are being paid more than your remaining basis in the debt.

The mechanics depend on whether the loan is a written note or an open account, and on the year's numbers. Interest you receive is a separate matter and is taxed as interest, not as a return of principal.

Keep a simple record each year: the loan balance, your debt basis, and what was repaid. A CPA can tell you what a given repayment does before it happens, which is the cheap time to ask.

The limitation: this is one of the areas where reasonable-sounding shortcuts cost money. Do not time repayments on a hunch. Check them against your basis first.

4. Charge Interest at a Reasonable Rate and Report It

A real loan carries interest. The corporation generally deducts the interest it pays you, and you report that interest as income on your own return. Both sides should show it, and the amount should match the note.

For the rate, the IRS publishes applicable federal rates (AFRs) each month, and a rate well below them can raise below-market loan questions under IRC 7872. Many owners use a rate at or above the AFR for the loan's term, and a CPA can say which fits.

Ask your CPA whether the corporation owes you a Form 1099-INT for the interest it pays, and what the interest does to your side of the return.

The limitation: interest paid to you is income to you. A shareholder loan does not give anyone a tax-free way to move money out of the company, and a rate that is too high looks like something else.

5. Do Not Use the Loan to Disguise Distributions or Wages

If the corporation "lends" you money with no note, no interest and no repayment, the IRS can treat it as something other than a loan. Depending on the facts it may look like a distribution, which affects your stock basis, or compensation, which brings payroll tax.

An S corporation can have only one class of stock. Straight debt, such as a written, unconditional promise to pay a set sum on demand or on a fixed date, with an interest rate that does not depend on profits, is generally not treated as a second class of stock under IRC 1361(c)(5). A loan that looks more like an equity stake can raise questions about that status.

The limitation: owners who also work in the business should pay themselves reasonable wages through payroll, not through loan repayments. That is a separate rule with its own test, and your CPA should confirm it for you.

6. Keep the Shareholder Loan Out of Equity in Your Books

The books should say what the paperwork says. A loan from you to the company is a liability. A loan from the company to you is an asset, a receivable. Contributions and distributions are equity. Mixing them is the most common reason owners cannot answer "what is my basis?" at tax time.

Use a separate account for each shareholder's loan. Record principal and interest separately. Record each payment as repayment of principal, interest, or a distribution, never as a catch-all line like "owner transfers."

The limitation: clean books do not fix a loan that was never really a loan. They record the facts accurately, but only the facts you have. If the advance was meant as equity, the books should say that too.

Where Iota Finance Fits

Iota Finance is a Florida-based firm, founded in 2022. Igor Tutelman, CPA, is the Managing Partner. It provides monthly accounting, tax and fractional CFO services for small businesses, startups and entrepreneurs, serves clients nationwide, and lists minimums of $200,000 income, $500,000 revenue and $500,000 raised.

A shareholder loan sits between bookkeeping and tax, which is where a firm doing both can help: one that records the loan correctly during the year and checks the basis math when the return is prepared.

Iota Finance has 14 verified client reviews on Sam's List as of 2026-10-02. Each review is submitted by an individual who identifies as a client of the firm and rates it on communication, subject-matter knowledge, and overall satisfaction. Reviews reflect those individual experiences and do not represent an endorsement by Sam's List. Iota Finance is a paid featured member of Sam's List. Ratings and rankings are not indicative of future performance or results.

The limitation, plainly: the minimums put smaller owners outside its range, and the profile does not say the firm handles shareholder loans or basis calculations in particular. Ask whether it does and who prepares the basis schedule.

Frequently Asked Questions

Can an S corporation owner lend money to the company?

Yes. A shareholder can lend money to the S corporation, and many do. To be treated as debt, it should be a bona fide loan with a written note, a stated interest rate and a repayment plan that is followed. Ask your CPA how it will be treated before you transfer funds.

What is the difference between stock basis and debt basis in an S corp?

Stock basis is what you paid for your shares, adjusted each year for income, losses and distributions. Debt basis comes from money you personally lent the corporation. Losses are generally applied against stock basis first, then debt basis. Your CPA can calculate both.

Does an S corp shareholder loan need a written agreement?

It should have one. A note with the amount, interest rate, repayment terms and both signatures is the best evidence that the advance is real debt, and loan documentation like this is also what your bookkeeper needs to record it. No document guarantees the IRS will agree, so follow the terms.

Do I have to charge interest on a loan to my S corp?

A real loan generally carries interest, and a rate far below the IRS applicable federal rates can raise below-market loan questions. The corporation deducts the interest, and you report it as income. Ask your CPA what rate fits your loan and whether Form 1099-INT applies.

If you are about to move money into or out of your S corporation, write the note first, then take it to your CPA. You can browse accountants on Sam's List, including the firm above.

Disclosure: Some firms named here pay for a Sam's List listing or featured placement. Sam's List takes no referral fee or commission on any engagement.

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About the author: Kimberly Green is cofounder of Sam’s List, a directory and matching platform for financial professionals.