7 Deductions That Get Denied for Bad Records, Not Bad Reasons
Sam's List Editorial | 2026-09-06
The deduction was real. The expense happened. The business purpose was genuine.
And it still got thrown out, because the only evidence was a line on a credit card statement that said "SQ *AMBERSON" and a memory.
That is the shape of most deductions denied for bad records. Not fraud, not aggression, just a legitimate expense with nothing behind it. And for a specific set of categories, the tax code does not give you the benefit of the doubt at all. Under IRC Section 274(d), travel, meals, and listed property including vehicles are subject to strict substantiation, which means no deduction is allowed unless you have adequate records or your own detailed statement corroborated by other evidence. Estimates do not save you. A judge cannot approximate the number for you the way one might for other expenses.
Here are the seven where the paperwork, not the reasoning, is what fails.
1. Business Meals
The receipt is the part everyone remembers. It is also the easy half.
Under the strict substantiation rules, a business meal needs the amount, the date, the place, the business purpose, and the business relationship of the person you ate with. "Client dinner" is not a business purpose. "Discussed Q4 scope expansion with Dana Reyes, ops lead at Northbrook" is.
Fixed version: photograph the receipt and add two fields to it the same day, who and why. Most expense apps have a memo field that takes four seconds. The deduction is generally limited to 50% of the cost, and that limit applies to a documented meal and an undocumented one identically. One of them survives.
2. Vehicle Mileage
Vehicles are listed property, which puts them squarely inside Section 274(d). That has one very practical consequence: the log has to be contemporaneous, meaning kept at or near the time of use.
The December reconstruction from a calendar and Google Maps is the single most common failure in this category. It is also visibly a reconstruction, because real logs have odd numbers and gaps and a fake one has neither.
Fixed version: a mileage app that runs automatically, reviewed weekly, recording date, business purpose, and miles. If you claim actual expenses instead of the standard rate, you also need the receipts and the business-use percentage that supports the split. Either method needs total miles for the year, which means an odometer reading in January and one in December.
3. Travel That Mixes Business and Personal Days
A trip that is primarily for business gets the airfare. A trip that is primarily personal does not, even if you took two client meetings.
The test turns on facts and circumstances, and the day count is the evidence everyone looks at first. Lodging and meals on business days are generally deductible even on a mixed trip. The flight is all or nothing.
Fixed version: keep the itinerary, the meeting confirmations, and a simple day-by-day list showing which days were business and which were not, saved with the trip's expenses. Build it while you are there. Nobody has ever successfully rebuilt a five-day trip nine months later.
4. Business Gifts Over the Limit
The business gift deduction is capped at $25 per recipient per year under IRC Section 274(b), a figure that has not moved since 1962. Incidental costs like engraving, packing, and shipping do not count toward the $25 if they do not add substantial value.
The failure here is not usually the limit. It is that nobody tracks gifts by recipient, so at year end there is a pile of gift-shaped charges with no way to allocate them, and the whole category becomes indefensible.
Fixed version: a gift log with recipient name, business relationship, date, and cost. It is a five-column spreadsheet. Also decide up front whether an item is a gift or entertainment, because entertainment is generally not deductible at all now, and a client's concert ticket is not a $25 problem, it is a zero problem.
5. Contractor Payments With No W-9 on File
You paid a contractor $9,000. Real work, real invoice. You never collected a Form W-9, so you have no taxpayer identification number, so no 1099 was issued.
Two things follow. First, the payment is harder to substantiate as a business expense to an unrelated party. Second, and more immediately expensive, a missing or incorrect TIN triggers backup withholding at 24%, and the payer is the one on the hook for the amount that should have been withheld.
Fixed version: no W-9, no first payment. Make it a hard rule in your onboarding, not a January chase. Worth knowing for 2026: the reporting threshold for Forms 1099-NEC and 1099-MISC rose to $2,000 for payments made on or after January 1, 2026, up from $600, which changes who gets a form but does not change whether you should collect the W-9. Collect it from everyone.
6. Equipment With No Date Placed in Service
Depreciation, Section 179 expensing, and bonus depreciation all turn on when an asset was placed in service, not when it was ordered or paid for.
A credit card charge dated December 28 for a machine that arrived in February is a next-year asset. Without an invoice, a delivery record, or anything showing the date it was actually put to use, the timing claim has nothing behind it, and timing is the entire point of accelerating a deduction.
Fixed version: keep the vendor invoice with the asset, note the date placed in service, and maintain a fixed asset schedule rather than reconstructing one from bank activity. This is also the record that makes a future sale or trade-in calculable.
7. Charitable Contributions From the Business Account
A sole proprietor writes a check to a nonprofit from the business account and books it as a business expense. It usually is not one. For most pass-through owners, a charitable contribution flows to the personal return as an itemized deduction, not to Schedule C.
There is a narrow path where a payment to a charity is genuinely an advertising or sponsorship expense, when the business receives commensurate advertising value. That path requires documentation of what you got, not just what you gave.
Fixed version: book charitable gifts to owner's draw or distributions unless you have a sponsorship agreement showing the advertising received. For the personal deduction, keep the contemporaneous written acknowledgment from the organization for any gift of $250 or more.
What a Defensible File Actually Looks Like
None of this is complicated. It is just a habit that has to happen within a week of the expense, because everything above is easy on Tuesday and impossible in April.
The working version is three things. A receipt capture tool that files by date. A memo convention you always follow, who and why. And a monthly ten-minute review where anything without a memo gets one or gets reclassified.
Good Operator is a West Hollywood accounting, finance, tax, and fractional CFO practice founded in 2017, with a team of sixteen serving clients nationwide. Its stated specialties cover SMB owners, solopreneurs, digital nomads, and K-1 partnership income, which is the exact profile where documentation habits either exist or the year is a mess.
Good Operator has 31 verified client reviews on Sam's List as of 2026-09-06. Each review is submitted by an individual who identifies as a client of the firm and rates it on communication, subject-matter knowledge, and overall satisfaction. Reviews reflect those individual experiences, do not represent an endorsement by Sam's List, and are not indicative of future results.
A firm that enforces the habit is worth more here than one that cleans up after it. That said, no accountant can create records that were never made, fees are a real cost against whatever the documentation preserves, and good recordkeeping reduces exposure rather than eliminating it.
For home office records specifically, which follow their own rules, see 7 Records That Support a Home Office Deduction If the IRS Asks. If you want help building the habit rather than the spreadsheet, compare firms in the Sam's List accountant directory.
Frequently Asked Questions
What is strict substantiation under IRC Section 274(d)? It is a heightened recordkeeping standard for travel, meals, and listed property such as vehicles. No deduction is allowed for those categories unless the taxpayer produces adequate records, or their own statement corroborated by other evidence, covering the amount, time, place, business purpose, and business relationship. Reasonable estimates are not accepted in these categories.
Do I need a receipt for every business expense? Not for every one, but the safest practice is close to it. Written records are generally expected for expenses of $75 or more and for all lodging, and the strict substantiation categories need supporting detail regardless of amount. A bank or card statement alone shows an amount and a vendor, not a business purpose.
How much can I deduct for a business gift? Up to $25 per recipient per year under IRC Section 274(b). Incidental costs such as engraving, packaging, and shipping are excluded from the limit if they do not add substantial value. Gifts to a company that are intended for a specific individual are generally treated as gifts to that individual.
What happens if I never collected a W-9 from a contractor? You lack the taxpayer identification number needed to file an accurate information return, and a missing or incorrect TIN can trigger backup withholding at 24% on reportable payments, with the payer liable for amounts that should have been withheld. Collect the W-9 before the first payment rather than at year end.
About the author: Kimberly Green is the cofounder of Sam's List, where business owners and high earners find vetted CPAs, financial advisors, and fractional CFOs. She's met one-on-one with 400+ financial professionals and writes from the real data behind thousands of client-advisor matches. Ask her anything about finding an accountant - she's heard it all, including the questions people are afraid to ask.