IRC §166 Bad Debt Tax Deduction
Turn uncollectible debts into tax deductions with properly documented demand letters
The Demand Letter as Tax Documentation
When someone owes you money and won't pay, a demand letter serves two purposes simultaneously:
- Collection effort: Creates legal pressure to pay — and it works more often than you'd expect
- IRS documentation: If the debtor can't or won't pay, the demand letter becomes evidence supporting an IRC §166 bad debt deduction on your tax return
The IRS specifically requires evidence of collection efforts before allowing a bad debt deduction. An attorney-drafted demand letter with certified mail receipt is the gold standard documentation.
IRC §166 Requirements
| Requirement | What the IRS Needs | How I Document It |
|---|---|---|
| Bona fide debt | Genuine debtor-creditor relationship | Demand letter references the note/agreement/invoice terms |
| Basis in the debt | You actually loaned or earned the money | Attach bank records, promissory note, or invoices |
| Debt became worthless | Debtor can't pay; collection is futile | Worthlessness assessment memo after demand fails |
| Collection efforts | Proof you tried to collect | Demand letters + certified mail receipts + response log |
| Year of worthlessness | Deduction in the correct tax year | CPA coordination on timing |
Business vs. Nonbusiness Bad Debt
- Created or acquired in your trade or business
- Deductible as ordinary loss
- Partial deduction allowed
- Can reduce ordinary income dollar-for-dollar
- Examples: client invoices, vendor advances, business loans
- Not created in your trade or business
- Treated as short-term capital loss
- Must be totally worthless (no partial)
- Subject to $3,000/year limit vs. ordinary income
- Examples: personal loans, investment losses
My IRC §166 Documentation Package
When I'm engaged to prepare tax documentation for an uncollectible debt, the package I deliver to your CPA includes:
- Formal Demand Letter(s): 1-3 attorney-drafted demands with certified mail receipts, establishing the collection effort timeline
- Collection Effort Chronology: Dated summary of all collection attempts (calls, emails, letters, meetings)
- Debtor Financial Assessment: Documentation of debtor's inability to pay — bankruptcy filings, dissolved entity records, asset search results, or debtor's own financial disclosures
- Worthlessness Determination Memo: Attorney analysis explaining why further collection is futile
- Debt Classification Analysis: Business vs. nonbusiness determination with supporting reasoning
- IRS Documentation Statement: The specific statement required by Reg. §1.166-2 for attachment to the tax return, including:
- Description of the debt and amount
- Date debt became due/worthless
- Debtor's name and relationship
- Efforts made to collect
- Why debt is deemed worthless
How Tax Recovery Works (Example)
Uncollectible debt: $50,000 personal loan (nonbusiness bad debt)
Tax treatment: Short-term capital loss
If taxpayer is in the 32% bracket:
- Year 1: $3,000 deduction → $960 tax savings
- $47,000 carries forward
- Can offset capital gains dollar-for-dollar (if any)
- If taxpayer has $50,000 in capital gains that year: full $50,000 offset → $16,000 tax savings
If classified as business bad debt: Full $50,000 ordinary deduction → $16,000 tax savings in year 1
Pricing
Need Bad Debt Documentation for Tax Season?
Send me the details — I can typically complete the demand letter series and documentation package within 2-3 weeks.
Email owner@terms.law