An examiner disallows $41,000 of deductions not because the client lied, but because the file held only a credit card summary line reading "Office Supply Co." Substantiation wins cases; testimony rarely does.
Substantiation means backing up each item on a return with records. When the IRS examines a return, every issue comes down to three questions: did the transaction happen, how much was it, and does the law allow the treatment the taxpayer claimed? Documents answer the first two questions. Your legal argument answers the third.
Financial documents and legal documents don't all carry the same weight. A document's strength as evidence depends on four attributes:
KEY: Under IRC 6001, the taxpayer bears the burden of keeping records sufficient to establish every item on the return. As the representative, your job is to turn the client's pile of paper into that record.
Financial documents prove that money actually moved. Cancelled checks or equivalent proof of payment, bank statements, credit card statements, receipts, and brokerage records form the backbone of almost every examination file you will...
Common mistakes
- Treating a credit card statement as a receipt. A $6,200 line of charges proves only that payment was made. Without itemized receipts, the $1,400 unreceipted portion is lost, and the 50% meal limit then cuts what remains.
- Applying the Cohan rule to IRC 274(d) items. Estimation is not available for travel (including meals while away from home), gifts, and listed property. Candidates allow a "reasonable" mileage estimate and select a wrong dollar answer.
- Reading the payment year instead of the decree date. Alimony under a decree executed after December 31, 2018 is neither deductible nor includible, no matter when the payments are made.
Bottom line
- Payment proof and purpose proof are separate. Cancelled checks or their equivalent and bank statements show payment; receipts and invoices show what was bought.
- Credit card statements never substantiate a deduction alone; pair every charge with an itemized receipt.
- Brokerage records supply basis. Unsubstantiated basis defaults to zero, making all proceeds gain.
- Legal documents decide status facts: a birth certificate proves age and parentage; divorce decrees fix filing status and alimony character by decree date, with post-2018 decrees neither deductible nor includible.
Exam shortcut
Run every substantiation stem through one order. First ask which fact is contested: amount, occurrence, or legal character. Amount and occurrence are answered by financial documents; character is answered by legal documents or entity instruments. Then check for an IRC 274(d) flag. If the stem names travel (including meals while away from home), gifts, or listed property, the estimation answer choice is always the distractor.
The full lesson (about 3,352 words, 22 min read) adds 2 worked examples, all 6 common mistakes, a self-check, free in the app.
Learning objectives
- 4
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