At some point you’re going to have an invoice where you’ve exhausted every reasonable option to collect. You’ve sent reminders. You’ve offered settlement. The debtor is unreachable or insolvent. At that point, the tax code lets you write it off, but only if you follow the rules.
A bad debt deduction is a real tax benefit. The IRS allows you to claim the loss on your return and reduce your taxable income dollar-for-dollar. But the rules are specific. Miss one and the deduction gets disallowed, which means auditors will be asking for it back with penalties.
This guide covers when you can claim a bad debt, which accounting method you need to use, how to document it, and what the IRS is actually looking for.
What counts as a bad debt
From the tax code’s perspective, a bad debt has two parts: there was a real debt, and it became truly worthless.
Real debt: You provided goods or services. The customer owed you money. The debt was documented. An invoice, a contract, a written agreement, or something contemporaneous that proves the liability existed and the amount.
Truly worthless: You’ve taken reasonable steps to collect. The debtor is insolvent, bankrupt, or disappeared. You’ve made a business decision that the collection cost exceeds the recovery probability, so you’re writing it off.
If you gave a customer an $8,000 job and they never paid, you have a real debt. If you subsequently learned they filed for bankruptcy two years ago and you have $0 chance of recovery, that’s truly worthless.
If you gave a customer a discount upfront as part of a promo (“referral discount”), that’s not a bad debt. That was always a price reduction, not a debt that went bad.
Accounting method determines if you can deduct it
The IRS splits businesses into two categories: cash-basis and accrual-basis. Your accounting method determines whether you can claim a bad debt deduction.
Cash basis: You record income only when you receive payment. If you never got paid, you never recorded the income, so there’s no income to deduct a bad debt against. You cannot claim a bad debt deduction. (Exception: if you received a payment in an earlier year and later had to refund it, that refund becomes a bad debt.)
Accrual basis: You record income when the invoice is issued, not when payment arrives. If the invoice goes bad, you can later deduct it. This is where bad debt deductions live.
Most small businesses under $5 million in annual revenue use cash-basis accounting. It’s simpler and defers taxes. If that’s you, bad debt deductions are not available. You never took the income into taxable income in the first place.
If you use accrual-basis accounting (common for businesses with higher revenue or those required by their industry), bad debt deductions are available to you.
Check your books first
Before claiming a bad debt deduction, verify which accounting method you're using. Review your prior-year tax return (Form 1040 Schedule C for sole proprietors, Form 1120 for corporations). If you're on cash basis, bad debt deductions won't be allowed. If you're on accrual basis and you took the income into revenue in a prior year, you can deduct it when it goes bad.
How and when to claim the deduction
Once you’ve determined your method qualifies, the deduction process is straightforward:
1. Make the business decision. You decide the debt is uncollectible. This happens when:
- Collection efforts have genuinely ceased (letters, payment plans, offers of settlement have all failed).
- Time has passed (the debt is typically 3+ months old, though there’s no bright-line IRS rule).
- The debtor is insolvent, bankrupt, relocated without forwarding address, or their business has closed.
2. Document your collection efforts. Keep a record of what you did to collect:
- Reminder emails (dates sent).
- Settlement offer letters (amounts, dates).
- Phone logs if applicable (date, person called, outcome).
- Any payment plan proposal that was rejected or abandoned.
This doesn’t have to be elaborate. A simple dated memo in your invoice system stating “Sent final demand letter 2026-04-15; no response. Debtor unreachable as of 2026-05-01. Write-off authorized” is sufficient.
3. Record the write-off in your accounting system. Create an entry removing the unpaid invoice from your accounts receivable and recording a bad debt expense. The exact entry depends on your accounting software, but it typically looks like:
- Debit: Bad Debt Expense (reduces profit)
- Credit: Accounts Receivable (removes the invoice)
Timing matters for the tax year
Claim the bad debt deduction in the tax year when you make the decision that it's uncollectible. Don't wait to "confirm" it's uncollectible two years later. Claim it in the year you genuinely gave up on collecting it. This affects which tax year you get the deduction on.
4. Claim it on your tax return. For sole proprietors, you report the deduction on Form 1040 Schedule C under “Bad debts” (line 18). For S-corps or C-corps, the entry goes on Form 1120 under “Bad debts” as well. Your tax software or accountant will have the specific line.
IRS Topic 431 and documentation
The IRS’s official guidance on bad debt deductions is IRS Topic 431. It covers the basics: real debt, truly worthless, and the timing rules. It also covers what happens if you later collect a portion of the debt (you have to report the recovery as income in the year it’s collected).
The IRS doesn’t have a “bad debt checklist” form or require advance approval. You claim it on your return. If audited, the IRS will ask for:
- Evidence the debt existed. A copy of the original invoice or contract.
- Evidence of collection efforts. Emails, letters, payment plan proposals, anything showing you tried.
- Evidence it’s worthless. A dated memo explaining why collection stopped (insolvency, bankruptcy, debtor disappeared, etc.).
Keep these three items in a single folder for each bad debt you claim. If you’re audited, you can produce them quickly.
What happens if you recover a bad debt later
Sometimes a year after you write off an invoice, the debtor sends payment. That payment is income in the year it arrives.
If you claimed a $5,000 bad debt deduction in 2025 and received $2,000 of it in 2026, you report the $2,000 as income in 2026.
This is one of the few areas where the tax code actually works in your favor: you get the deduction when it goes bad, and if you recover part of it later, you only report the recovered portion as income (not the full original amount again).
When bad debt deduction doesn’t help
If you’re on cash-basis accounting (the vast majority of small businesses), you don’t get a bad debt deduction because you never took the income into revenue in the first place. That $5,000 unpaid invoice reduced your profits when you decided not to collect it, but it happened in your internal calculations, not your tax filing.
The practical upshot: make sure you’re using accrual-basis accounting if bad debt deductions matter to your tax strategy. Don’t try to claim bad debt deductions while staying on cash basis. The IRS will deny them.
Next steps: preventing bad debt in the first place
Writing off a bad debt is a deduction, but it still hurts. A $5,000 deduction at a 25% tax rate saves you $1,250 in taxes, but you’re still out the $3,750. The better play is preventing bad debt in the first place.
That means:
- Invoicing faster (quicker payment due dates).
- Collecting sooner (reminders at days 1, 7, 14, 30 instead of waiting).
- Offering settlement options early (a 25% discount at day 30 beats a full write-off).
- Tracking cash-flow aging (which invoices are headed toward bad debt status).
Once you’ve exhausted those options (settlement, payment plans, formal recovery sequences), the write-off and the tax deduction become the final step in the accounts receivable process.
If you’re managing AR manually with spreadsheets and email reminders, you’re likely missing collection windows that a structured approach would catch. Software like ti3 runs a 5-week recovery sequence automatically (reminder, tone escalation, settlement options, payment plans) so that the write-offs that do happen are genuinely the ones with zero recovery probability, not the ones you just deprioritized.
FAQ
Q: Can I claim a bad debt on a personal loan I made to a friend for their business?
A: Not typically. The IRS distinguishes between “business bad debts” (where you’re in business and the debt arises from that business) and “non-business bad debts” (personal loans to friends). Non-business bad debts don’t qualify for a deduction. The exception: if you made a documented loan to an employee or business associate as part of your business operations, it can qualify as a business bad debt. But a personal favor loan generally doesn’t.
Q: If I’m self-employed, can I claim a bad debt deduction on Schedule C?
A: Only if you’re on accrual-basis accounting. If you’re on cash basis (most self-employed people), bad debts aren’t deductible because the income was never recorded in the first place. Switch to accrual basis if bad debt deductions are important to your situation.
Q: Does a bad debt deduction apply to sales tax I collected but didn’t keep?
A: No. Sales tax you collected but didn’t pay over to the state is a liability. A bad debt deduction doesn’t apply. You’re responsible for remitting it regardless.
Q: Can I claim a bad debt deduction for credit card chargebacks?
A: No. A chargeback is a reversal by the credit card company, not a bad debt from a customer. It affects your merchant account, not your accounts receivable.
Q: My customer filed for bankruptcy. Can I deduct the unpaid invoice?
A: Yes, if you’re on accrual basis. Bankruptcy makes the debt genuinely worthless for tax purposes. Document your claim in the bankruptcy proceedings, and then claim the bad debt deduction in the tax year the bankruptcy became final (or the year you made the decision the debt was uncollectible, whichever is earlier).