S corp debt basis and debt basis restoration

“If an S corporation repays reduced basis debt to the shareholder, part or all of the repayment is taxable to the shareholder.” IRS, S corporation stock and debt basis

What creates S corp debt basis?

S corp debt basis comes only from bona fide indebtedness of the S corporation that runs directly to the shareholder, according to Treas. Reg. 1.1366-2(a)(2)(i). Whether a loan is bona fide is decided under general federal tax principles on all the facts and circumstances. Guaranteeing a bank loan, co-signing, or acting as a surety creates no debt basis under Treas. Reg. 1.1366-2(a)(2)(ii). The shareholder gets debt basis only when they actually pay on the guaranteed loan, and only to the extent of the payment.

The regulation's examples cover three common structures. A loan made through an entity disregarded from the shareholder counts as the shareholder's loan. A back-to-back loan, where one S corporation lends to the shareholder and the shareholder lends the money on to a second S corporation, can create debt basis in the second corporation if the shareholder's loan is bona fide. A note distributed to the shareholder can also create basis if, under local law, the borrowing corporation becomes directly liable to the shareholder.

How are debt basis reductions and restorations calculated?

S corp debt basis is reduced only after stock basis reaches zero, and it is restored before stock basis can increase again. Under Treas. Reg. 1.1367-2(b)(1), losses, deductions, nondeductible expenses and oil and gas depletion that exceed stock basis reduce the basis of debt the shareholder holds at year end. With more than one loan, the reduction is spread across the loans in proportion to their basis under Treas. Reg. 1.1367-2(b)(3).

Restoration uses the net increase, which Treas. Reg. 1.1367-2(c)(1) defines as the amount by which the shareholder's income items exceed all items that decrease stock basis for the year, including distributions. The net increase restores reduced debt basis before any of it raises stock basis, and only for debt held at the start of the year. Restoration can't push basis above the loan's adjusted basis at the start of that year, ignoring prior section 1367 adjustments. With several loans, Treas. Reg. 1.1367-2(c)(2) restores a loan repaid during the year first, then spreads the rest by each loan's unrestored reduction.

How is a repayment of reduced-basis debt taxed?

A repayment of reduced-basis S corp debt is partly a tax-free return of basis and partly income, in the ratio of the loan's basis to its balance. The Shareholder's Instructions for Schedule K-1 (Form 1120-S), box 16, code E, make this split and cite Rev. Rul. 64-162 and Rev. Rul. 68-537. Form 7203 lines 24 to 26 apply it: basis before repayment over the loan balance, times the principal repaid. Under Treas. Reg. 1.1367-2(d)(1), that year's restoration takes effect immediately before the repayment.

The character of the gain depends on the paperwork. According to the Instructions for Form 7203, line 34, a formal note gives capital gain on Form 8949 and Schedule D, while open account debt gives ordinary gain on Form 4797. Open account debt means advances with no separate written instrument and $25,000 or less of aggregate principal at year end. In Treas. Reg. 1.1367-2, Example 7, a $3,000 net repayment on a $16,000 open account with $8,000 of basis produces $1,500 of income.

What does a debt basis restoration calculation look like?

A debt basis restoration calculation starts with the net increase and applies it to the loan before the repayment is tested for gain. For example, Lee owns 100% of a calendar-year S corporation and lent it $50,000 on a formal note in 2022. Losses in earlier years took Lee's stock basis to zero and reduced the note's basis to $20,000 by the end of 2024. In 2025 the K-1 shows $40,000 of ordinary income, $15,000 of distributions and $1,000 of nondeductible expenses, and the corporation repays $10,000 of principal.

Stock basis gets the $16,000 of income left after restoration, less the $15,000 distribution and $1,000 of nondeductible expenses, and ends at zero. The $1,200 gain goes on Form 8949 and Schedule D because the debt is a formal note. Without the 2025 restoration, the same repayment would have produced $6,000 of gain.

What do reviewers check on S corp debt basis?

A reviewer checking S corp debt basis confirms that each loan is real debt owed directly to the shareholder, then confirms that reductions, restorations and repayments followed Treas. Reg. 1.1367-2. The loan documents come first: notes, board approvals, the general ledger loan account and the bank records showing the shareholder's money going in. The prior-year Form 7203 supplies each loan's balance and basis at the start of the year, and the K-1 box 16, code E amount shows what was repaid. The reviewer then recomputes the net increase, because a restoration error changes both the gain on any repayment and the stock basis carried into the next year. Open account balances get a separate look at year end, since crossing $25,000 changes how the debt is treated in later years. The IRS also says to consider whether the shareholder had the financial means to make the loan. The six checks below each tie to the Instructions for Form 7203 or a Treasury regulation.