A bad debt tax deduction lets you recover some of what you lost when someone who owed you money can’t or won’t pay. Federal law under Internal Revenue Code Section 166 allows the write-off, but only if you can show three things: the debt was real and enforceable, you had actual money or recognized income tied up in it, and collection is genuinely hopeless. How much you save, and how fast, depends on whether the debt came out of your business or out of your personal life.
What Counts as a Deductible Bad Debt
The IRS starts with the concept of a “bona fide debt”: a real obligation where a specific amount was owed and the borrower was legally required to pay it back.1eCFR. 26 CFR 1.166-1 – Bad Debts Gifts don’t qualify. Neither does a loose understanding that a friend would pay you back when they could. You need a debtor-creditor relationship supported by something enforceable, ideally a signed promissory note or written loan agreement.
You also need basis in the debt, meaning you must have parted with something of value. Loaning cash from your bank account gives you basis because that money was already earned and taxed. A business using accrual accounting has basis in an unpaid invoice because it already reported the sale as income on a prior return. Cash-basis taxpayers, which covers most individuals, cannot deduct unpaid wages, fees, rent, or interest owed to them, because that income was never reported in the first place.2Internal Revenue Service. Topic No. 453, Bad Debt Deduction
Proving the Debt Is Worthless
A legitimate debt isn’t enough on its own. You have to show the IRS that recovery is realistically impossible. The regulations weigh all relevant evidence, with particular attention to the debtor’s financial condition and the value of any collateral.3eCFR. 26 CFR 1.166-2 – Evidence of Worthlessness Someone who lost a job but owns a house with equity is not automatically uncollectible. Someone who filed bankruptcy with no assets usually is.
You are not required to sue. If the facts make it clear a lawsuit would produce nothing, documenting those facts satisfies the standard.3eCFR. 26 CFR 1.166-2 – Evidence of Worthlessness You do need to show effort, though. Demand letters, phone logs, and emails asking for payment help demonstrate that you didn’t quietly walk away from money you could have collected.
Bankruptcy is one of the strongest indicators, especially for unsecured debts. Discharge papers or notice that a bankruptcy case closed without paying your claim provide clean documentation. A debt can become worthless before the bankruptcy case ends, and the deduction belongs in the year the debt actually lost its value, not the year the court closes the file.3eCFR. 26 CFR 1.166-2 – Evidence of Worthlessness Getting the year right matters, because the deduction has to be claimed for the tax year the debt actually became worthless.4Office of the Law Revision Counsel. 26 USC 166 – Bad Debts If you realize a year late, you’ll likely need an amended return rather than a current-year deduction.
Business Debts vs. Personal Debts
Whether the debt is connected to your trade or business drives everything else: how much you can deduct, when you can deduct it, and what kind of income it offsets.
Business Bad Debts
A business bad debt is one created or acquired in connection with your trade or business, or one that became worthless in that context.4Office of the Law Revision Counsel. 26 USC 166 – Bad Debts Typical examples are credit sales that never get paid, loans to suppliers, and advances to employees. The test is whether your primary motive was business.
The benefit is significant. Business bad debts come off as ordinary losses that reduce taxable income dollar-for-dollar with no annual cap. You can also deduct a partially worthless business debt without waiting for the rest to go bad. If a customer owes $50,000 and $30,000 is clearly gone, you can deduct the $30,000, provided you charge off the uncollectible portion on your books during the tax year.4Office of the Law Revision Counsel. 26 USC 166 – Bad Debts
Nonbusiness Bad Debts
Any debt that fails the business connection test is a nonbusiness bad debt. Personal loans to friends, relatives, and acquaintances are the usual examples. The rules are stricter. You cannot deduct a nonbusiness debt until it is totally worthless. If someone owes you $10,000 and pays back $2,000 before going silent, the remaining $8,000 is deductible only once you’ve established that entire amount is gone.4Office of the Law Revision Counsel. 26 USC 166 – Bad Debts
Nonbusiness bad debts are treated as short-term capital losses no matter how long the debt was outstanding.6Office of the Law Revision Counsel. 26 USC 166 – Bad Debts
The Capital Loss Cap on Personal Bad Debts
Because a nonbusiness bad debt is a short-term capital loss, it first offsets any capital gains you have for the year. If your losses exceed your gains, only $3,000 of the remaining loss can offset ordinary income like wages. Married filing separately drops that to $1,500.5Internal Revenue Service. Topic No. 409, Capital Gains and Losses
Anything above the annual cap carries forward to future years.7Internal Revenue Service. Topic No. 409, Capital Gains and Losses A $30,000 personal loan that goes bad could take a decade to fully deduct if you never have capital gains to soak it up. The same $30,000 as a business debt would reduce your taxable income immediately.
Loans to Family Members
Family loans generate most nonbusiness bad debt claims and draw the closest IRS scrutiny. The default assumption is that money moving between relatives is a gift, and a gift produces no deduction because there was never an enforceable obligation to repay.
To overcome that presumption, the loan has to look like a loan from day one. The factors that carry weight:
- A signed promissory note stating principal, interest rate, and repayment schedule.
- Interest at or above the Applicable Federal Rate the IRS publishes monthly. Zero or below-market interest suggests a gift.
- Records of actual payments made on schedule.
- Evidence the borrower had the ability to repay when the loan was made.
- Demands for payment when payments stop, rather than quiet acceptance.
A pattern of forgiving payments as they come due is especially damaging. If you routinely told your brother to skip a month, the IRS will treat the arrangement as a gift wearing loan clothing. The time to build the paper trail is when you make the loan, not years later.
Guarantees and Cosigned Loans
If you guaranteed someone else’s loan and had to pay the lender after they defaulted, that payment can be a bad debt. Whether it’s business or nonbusiness depends on why you signed the guarantee.2Internal Revenue Service. Topic No. 453, Bad Debt Deduction Guaranteeing a loan mainly to protect your job at the borrower’s company produces a business bad debt. Guaranteeing to protect your investment in the company produces a nonbusiness bad debt.
Three conditions apply: you must have had a legal obligation to pay, the guarantee must have been in place before the debt became worthless, and you must have received something of value for signing. If you retain a right to recover from the original borrower, the deduction waits until that right itself becomes worthless.
How to Report It
Nonbusiness Bad Debts
Report a totally worthless nonbusiness bad debt on Form 8949, Part I, which flows into Schedule D of your Form 1040. Enter the debtor’s name and note “bad debt statement attached,” use the date the debt became worthless as the sale date, zero as proceeds, and the amount of the debt as your basis.2Internal Revenue Service. Topic No. 453, Bad Debt Deduction
You must attach a separate statement covering:8Internal Revenue Service. Publication 550, Investment Income and Expenses
- A description of the debt, including the amount and the date it came due.
- The debtor’s name and any business or family relationship.
- The collection steps you took.
- The facts showing why the debt is worthless, such as the borrower’s bankruptcy or inability to pay.
Skipping this statement is one of the fastest ways to lose the deduction in an audit. The IRS expects it, and without it you’re asking the examiner to take your word.
Business Bad Debts
Sole proprietors report business bad debts on Schedule C. Corporations use Form 1120, partnerships use Form 1065.2Internal Revenue Service. Topic No. 453, Bad Debt Deduction A statement of facts supporting the deduction should accompany the return.1eCFR. 26 CFR 1.166-1 – Bad Debts
The Seven-Year Window to Claim or Amend
Bad debts get a longer refund window than most tax items. The usual deadline for claiming a refund is three years from filing, but bad debts and worthless securities get seven years, measured from the due date of the return for the year the debt became worthless.9Office of the Law Revision Counsel. 26 USC 6511 – Limitations on Credit or Refund Congress built in the extra time because worthlessness often isn’t obvious right away.
If you discover that a debt became worthless in a prior year still inside that seven-year window, file Form 1040-X for the correct year, attach the required bad debt statement, and include Form 8949 or the applicable business schedule.10Internal Revenue Service. Time You Can Claim a Credit or Refund
Records to Keep
The IRS specifically advises keeping records for seven years when you’ve claimed a bad debt deduction.11Internal Revenue Service. How Long Should I Keep Records That matches the refund window and protects you if the deduction is questioned years later. Hold onto the original loan documents, the promissory note, all correspondence with the debtor, records of collection efforts, and any bankruptcy filings or court documents. Keep both digital and paper copies where you can, so a single failure doesn’t wipe out your audit defense.