How to Write Off Accounts Receivable for Tax Purposes

To write off accounts receivable, you remove the unpaid balance from your books and, if you qualify, claim a bad debt deduction under Internal Revenue Code Section 166. Two tracks have to line up: the accounting entries that clear the receivable from your balance sheet, and the tax reporting that turns the loss into a deduction. Whether you can do the second part at all depends on your accounting method, so start there before you touch a journal entry.

Does Your Accounting Method Even Allow the Deduction

The IRS permits a bad debt deduction only if the amount was previously included in your gross income, or you loaned out cash.¹ That single rule shuts most cash-basis service businesses out of the deduction for unpaid invoices.

Cash-basis taxpayers record income only when payment arrives. An invoice a customer never paid was never counted as income, so there’s nothing to deduct.² Accrual-basis businesses do get the deduction, because they already recorded the receivable as revenue when it was earned.³ The one carve-out for cash-basis taxpayers: if you actually loaned cash to a customer or business contact and they don’t repay, that loss can qualify because real money left your pocket.

What Counts as a Worthless Debt

Section 166 allows a deduction for any debt that becomes worthless during the tax year.⁴ Two things must be true. First, a genuine debtor-creditor relationship existed, with a legal obligation to repay a fixed amount. Informal arrangements where repayment was never really expected don’t qualify.

Second, the debt has no realistic chance of collection. The IRS looks at all relevant evidence: the debtor’s insolvency, a bankruptcy discharge, inability to locate the debtor, abandonment of the obligation, the value of any collateral, and the debtor’s overall financial condition. You don’t have to sue first. If suing would almost certainly not produce a collectible judgment, that’s enough.⁵ Expiration of the collection statute of limitations in your jurisdiction is another strong indicator.

Partial vs. Total Worthlessness

Business bad debts don’t have to be completely uncollectible. Section 166(a)(2) allows a deduction for partially worthless debts, but only for the portion you actually charge off on your books that year.² If a customer owes $10,000 and you determine $6,000 is gone, charge off $6,000 and deduct that amount.

You aren’t required to charge off a partially worthless debt on any set schedule. The hard deadline is the year the debt becomes totally worthless. After that, you lose the deduction for any amount you hadn’t previously charged off.²

Recording the Write-Off on Your Books

Two accounting methods handle the entry differently, and the right one depends on the framework your business follows.

Direct Write-Off Method

The direct write-off method records the loss only when a specific account is identified as uncollectible. Debit Bad Debt Expense, credit Accounts Receivable for the customer’s balance. Net income drops and the receivable is gone from the balance sheet.

Because the expense often lands in a different period than the original sale, this method violates the GAAP matching principle and is generally not acceptable for larger or publicly traded companies. Smaller businesses and sole proprietors use it because it’s simple, and the IRS accepts it for tax purposes.

Allowance Method

The allowance method estimates expected losses upfront through a contra-asset account, Allowance for Doubtful Accounts. Each period, you record an estimated bad debt expense that offsets revenue in the same timeframe. Accounts Receivable then appears on the balance sheet at its net realizable value.

When a specific customer’s balance is later confirmed uncollectible, debit Allowance for Doubtful Accounts and credit Accounts Receivable. That second entry doesn’t touch the expense account; the expense was already booked during the estimation phase. The write-off just draws down the reserve.

Estimates typically come from either a percentage of credit sales (a flat historical loss rate applied to the period’s credit sales) or an aging of receivables (higher loss percentages applied to older buckets). Aging usually produces more accurate numbers because older debts are demonstrably harder to collect. Either way, review the percentages periodically. An allowance that never moves despite changing collection patterns will draw auditor questions.

Documentation to Keep

The journal entries take minutes. The file that supports them is what the IRS actually wants to see.

Keep the documents that prove the debt existed: signed contracts, purchase orders, invoices, promissory notes. Keep the collection record: demand letters, call logs, emails requesting payment, and the debtor’s responses. If the debtor filed bankruptcy, keep the court notices and any distribution reports. If a collection agency handled the account, retain their correspondence and final status report. Organize everything chronologically so the timeline is obvious: when the debt arose, when payment was first missed, what you did, and what confirmed the debt was uncollectible.

Related-party debts get extra scrutiny. If you lend money to a relative or friend with an understanding that repayment might not happen, the IRS treats it as a gift, and no deduction is available.¹ To deduct a related-party bad debt, you need written terms, a repayment schedule, interest, and evidence both sides treated it as a real obligation, plus a detailed statement attached to your return covering the debtor’s name, your relationship, the amount, when it became due, your collection efforts, and why you concluded the debt was worthless.

Where to Report the Deduction

The form depends on your entity type. The underlying rule is the same across all of them: the debt must have been previously included in gross income, and it must be worthless in whole or in part during the tax year.⁴

Sole proprietorships and single-member LLCs report bad debts on Schedule C (Form 1040) as part of other expenses on Line 48, covering debts from sales or services previously included in income and definitely known to be worthless.⁶
C corporations report on Form 1120, Line 15, entering total debts that became worthless in whole or in part during the year.⁷
S corporations use Form 1120-S, Line 10, for trade or business bad debts. A cash-method S corporation cannot claim the deduction unless the amount was previously included in income.⁸
Partnerships report on Form 1065, Line 12, subject to the same income-inclusion rule.⁹

The write-off on your books and the number on your return should match. A $15,000 write-off in the ledger and a $20,000 deduction on the return is the kind of gap that gets examined.

Business vs. Non-Business Bad Debt

The classification changes the tax treatment significantly, and it applies mostly to loans you make rather than to unpaid customer invoices from your own operations. A business bad debt, created or acquired in connection with your trade or business, is an ordinary deduction against taxable income.⁴

A non-business bad debt, such as a personal loan to a friend or family member, is treated as a short-term capital loss regardless of how long the debt was outstanding. Capital losses only offset capital gains plus up to $3,000 of ordinary income per year, so a large non-business bad debt can take years to fully deduct. Non-business debts also have to be totally worthless (no partial write-offs) and get reported on Form 8949 rather than as a business expense.¹ Document the business purpose of any loan or credit extension when you make it, because this classification is one of the most commonly contested issues in bad debt audits.

The Seven-Year Refund Window

Most refund claims have to be filed within three years of the return’s due date. Bad debt claims get longer. Under IRC Section 6511(d), a refund claim based on a bad debt or worthless security deduction can be filed within seven years of the return’s due date.¹⁰

The extra time exists because pinpointing the exact year a debt became worthless is genuinely difficult. If you realize a debt actually became worthless in a prior year and the normal three-year window has closed, check the seven-year rule before assuming the deduction is lost.

If the Customer Eventually Pays

Sometimes an account you gave up on comes back. Under the tax benefit rule in IRC Section 111, you include the recovery in gross income for the year you receive it, but only to the extent the original deduction actually reduced your taxes.¹¹ If the write-off produced no tax benefit (a net operating loss year, for instance), the recovery can be excluded. For debts written off partially across multiple years, each year’s deduction is treated separately, and recoveries apply first to the most recent deduction, working backward.¹²

On the books, reverse the write-off by re-establishing the receivable. Under the allowance method, debit Accounts Receivable and credit Allowance for Doubtful Accounts. Under the direct write-off method, credit Bad Debt Recovery income instead. Then record the cash receipt normally, and keep the recovery linked to the original write-off in your records so year-end reconciliation stays clean.

1
Internal Revenue Service. Topic No. 453, Bad Debt Deduction
2
Internal Revenue Service. Publication 334, Tax Guide for Small Business
3
eCFR. 26 CFR 1.166-1 – Bad Debts
4
Office of the Law Revision Counsel. 26 USC 166 – Bad Debts
5
eCFR. 26 CFR 1.166-2 – Evidence of Worthlessness
6
Internal Revenue Service. Instructions for Schedule C (Form 1040)
7
Internal Revenue Service. Instructions for Form 1120
8
Internal Revenue Service. Instructions for Form 1120-S
9
Internal Revenue Service. Instructions for Form 1065
10
Office of the Law Revision Counsel. 26 USC 6511 – Limitations on Credit or Refund
11
Office of the Law Revision Counsel. 26 USC 111 – Recovery of Tax Benefit Items
12
eCFR. 26 CFR 1.111-1 – Recovery of Certain Items Previously Deducted or Credited