The answer depends on two things: your accounting method and whether the debt truly becomes uncollectible.
There is no fixed timeline like “180 days = bad debt.” Instead, you write off an unpaid invoice as bad debt in the year it becomes worthless. Worthless does not mean “the debtor hasn’t paid yet.” It means “you’ve made a reasonable effort to collect, and the debtor is unlikely ever to pay.”
The accounting method gatekeep
Your ability to deduct a bad debt at all depends on how you keep your books.
Accrual-basis businesses (you record revenue when the invoice is issued, not when payment arrives) can deduct bad business debt. You reported the income; now you can deduct the loss when it becomes uncollectible.
Cash-basis businesses (you record revenue only when payment lands) cannot deduct bad debt. The unpaid invoice was never counted as income in the first place, so there’s nothing to deduct. This includes most sole proprietors and service businesses.
If you’re unsure which method you use, ask your accountant. Most small-business owners operate on cash basis by default.
What “uncollectible” actually means
You cannot write off an invoice the moment the due date passes. The IRS requires you to show reasonable effort to collect. This means more than a single phone call.
The collection sequence in docs/playbooks/recovery-recommendations.md covers the standard steps: friendly email reminders at days 1, 7, 14, then 21; a formal demand letter by day 30; escalation to a third-party partner or attorney if necessary. After you’ve sent emails, letters, and made reasonable contact attempts, and the debtor is genuinely unable or unwilling to pay, the debt becomes uncollectible.
The timeline varies. A debtor who disappears after a legal demand might be uncollectible within 60 days. A debtor in bankruptcy or insolvency might take longer, but the insolvency makes the debt uncollectible faster than hope alone would.
Most owner-operators determine a debt is uncollectible between 90 and 180 days after the first contact attempt, once collection letters and follow-ups have failed.
The deduction window
Once you determine a debt is uncollectible, you can deduct it in that tax year. The IRS allows a 7-year statute of limitations specifically for bad-debt deductions. If you missed deducting in year 1, you have until year 7 to amend and claim it.
However, the legal statute of limitations for collecting the debt itself varies by state, typically 3 to 6 years. Once that expires, the debt is legally uncollectible in most cases.
The practical threshold
Most small-business owners classify an invoice as bad debt after 120-180 days of failed collection attempts, once they've sent formal letters and received no response or payment. Document your collection efforts (emails, letters, calls) to support the deduction if the IRS asks.
Document everything
The IRS won’t simply take your word that a debt is uncollectible. Keep records of:
- The original invoice and invoice date.
- All emails, letters, and communication attempts with the debtor.
- Any phone calls (date, person, outcome).
- The debtor’s response or lack thereof.
- Any indication they cannot pay (bankruptcy filing, insolvency, business closure).
This trail shows you made reasonable efforts. If you later claim the bad-debt deduction, this documentation is what the IRS will review.
What ti3 does for collection efforts
If you’re an accrual-basis business with unpaid invoices, the 5-week recovery sequence through ti3 documents the entire collection trail in your name. Formal demand letters, structured follow-up, and clear escalation patterns all become part of your official collection record. By the time the 5-week program ends, you have a full record of collection efforts to support a bad-debt deduction if the account remains unpaid.
For cash-basis businesses, the deduction isn’t available, but the recovery process still helps you decide whether the account is genuinely uncollectible or worth pursuing further.
Frequently asked questions
Can I deduct a bad debt before trying to collect? No. The IRS requires you to make reasonable collection efforts first. One friendly email doesn’t count. A structured sequence over weeks, with follow-ups and formal letters, does.
What if the debtor is bankrupt? If the debtor is in bankruptcy or legally insolvent, the debt becomes uncollectible faster, often immediately. Document the bankruptcy filing as proof.
Does the statute of limitations expire the debt? The statute of limitations affects your legal right to sue, not the tax deduction. You can deduct a debt as bad after the statute of limitations expires, since at that point it is legally uncollectible. The 7-year IRS rule still applies to the deduction itself.
Can I deduct a bad debt if I sell it to a collection agency? If you sell the debt, you deduct your loss on the sale, not the full face value. If you sell an invoice for $3,000 for $500, you deduct $2,500 in that year.
What if the debtor makes a partial payment later? If the debtor later pays part of a debt you already deducted, you must report that payment as income in the year you receive it. The offset balances out over time.
Next: once a debt becomes uncollectible, the question shifts from “how do I recover this?” to “how do I write this off?” An accountant can walk you through the mechanics. If you’re in the collection phase and unsure whether an account is truly uncollectible, ti3’s recovery framework can help you document the effort and make the decision with confidence.