Financial Glossary
Debt Basis
Debt basis is the measure of a shareholder's economic investment in loans they have personally made directly to an S corporation. It is tracked separately from stock basis and represents the amount a shareholder can use to deduct pass-through losses once their stock basis has been reduced to zero. Debt basis increases when the shareholder lends money to the company and is reduced when losses are passed through or when the company repays the loan.
Problem & Application
For S corporation owners, including many short-term-rental and campground operators who lend their own money into the business during slow seasons, debt basis often determines whether a reported loss is actually deductible in the current year. A common and costly mistake is treating a personal guarantee on a third-party bank loan as debt basis; only loans made directly from the shareholder to the corporation generally count. Repaying a shareholder loan after basis has been reduced can also trigger unexpected taxable income, so the timing and documentation of these loans matter.
In Short
Accurately tracking debt basis each year is essential for S corporation shareholders who want to claim losses and avoid surprise gains on loan repayments.