The advice that circulates on expense records goes like this: a receipt reconstructed after the fact is worthless to the IRS, so write everything down the day it happens. The word that carries that advice is contemporaneous: records made at the time, not rebuilt later. The first answer I pulled on the subject went further and said a late record can cost you the deduction outright. I went to the regulation instead, because the difference between those two sentences matters a great deal to an owner at year-end.
The sentence that governs timing is in Treasury Regulation §1.274-5T(c)(1). It says a record made “at or near the time of the expenditure or use, supported by sufficient documentary evidence, has a high degree of credibility not present with respect to a statement prepared subsequent thereto when generally there is a lack of accurate recall.”
That is a credibility rule, and it cuts both ways. A prompt record carries weight that a later statement lacks, and the regulation names the reason: a lack of accurate recall. It does not say a late record is void.
What contemporaneous records actually measure
The regulation’s phrase is “at or near the time,” and it does not count days. It defines the phrase by what the person knows when they write the record: the elements are recorded when the taxpayer “has full present knowledge of each element” (§1.274-5T(c)(2)(ii)(A)).
So the test is memory. A record written the evening of a client dinner, while you still know who was at the table and what the conversation was for, qualifies. One written in March from a credit card statement is working from the amount and little else, and the business purpose is the part that went first.
What a late record can still do
When a taxpayer cannot show adequate records, or substantial compliance with them, the regulation provides another route in §1.274-5T(c)(3): the taxpayer’s own statement, “containing specific information in detail as to such element,” together with corroborative evidence sufficient to establish it.
That path is harder. A detailed account backed by a calendar entry, an email thread, or a colleague who was there is evidence. A general recollection that “this was probably a client meeting” is not. Late is weaker, though it is not nothing, and an owner who has been told otherwise may abandon a deduction that was supportable.
Where the rule gives no room
The flexibility has an edge. For travel (including meals and lodging while away from home), gifts, and listed property, the category that includes business use of vehicles, Internal Revenue Code §274(d) is written as a condition. No deduction is allowed unless the taxpayer substantiates, “by adequate records or by sufficient evidence corroborating the taxpayer’s own statement,” four things: the amount, the time and place (or, for a gift, the date and description), the business purpose, and the business relationship of the person who received the benefit.
The statute does not ask for a reasonable estimate of what you probably spent. It asks you to establish each element. For these categories, a missing business purpose or a missing relationship cannot be filled in with a plausible guess. The amount is rarely what goes missing, because the card statement has it. The purpose and the relationship live in the head of whoever was there, and they fade.
What this means if you run a larger business
Once a company reaches this size, the person who incurred the expense and the person who records it are usually different people. The traveling executive knows the purpose. The bookkeeper knows the amount. The gap between the two is where a year-end reconstruction begins, and the reconstruction is where the weaker evidence comes from.
If you reimburse employees, the regulation sets a clock of its own. Under the safe harbor in §1.62-2(g)(2), substantiating an expense within 60 days, or returning any excess within 120 days, is treated as happening within a reasonable period of time. That is a clock measured in weeks, not months.
I would not read any of this as permission to reconstruct freely. A late record is weaker evidence, and it invites questions that a prompt one does not. What the regulation supports is a narrower claim: a record made close to the event is strong, a later one can still be good, and for travel, gifts, and listed property, every element has to be established one way or the other.
One check worth running this month: take your last ten travel and gift expenses and ask whether someone can state the business purpose and who was there, without looking anything up and without asking anyone else. Where the answer is yes, the record is probably already in good shape. Where it takes a search through email, that is the gap to close, and it is cheaper to close it now than in the spring. For ways to build that check into the books, see Is Your Policy Real or Just a PDF? and Don’t Just Close the Books, Monitor Them.
This post is general information on the rules cited, read from the regulation and statute text, not advice on your particular situation. The rules have exceptions and conditions not covered here.
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