There's a filing cabinet, or a garage shelf, or a folder in a drive somebody set up in 2018. Nobody knows what's in it that matters, so nothing gets thrown away and nothing gets found.

How long to keep business records is more specific than the folklore suggests, and the rules are built around one idea: keep a record as long as it could still be needed to support something on a return.

The periods, by situation

The IRS frames retention around the period of limitations, the window during which a return can be amended or additional tax assessed.

  • Three years. The general rule for most records supporting income and deductions on a return. Measured from the later of the date you filed or the due date.
  • Three years from filing, or two years from paying the tax, whichever is later. The window for amending a return to claim a credit or refund. If you paid late, the second clock is the one that matters.
  • Six years. If you omitted income amounting to more than 25% of the gross income shown on your return.
  • Seven years. If you file a claim for a refund based on a loss from worthless securities or a bad debt deduction. This is the window for making the claim, not a penalty for having taken the write-off.
  • No limit. If you filed a fraudulent return, or if you didn't file at all. There is no clock running in your favor in either case.
  • Employment tax records: at least four years after the date the tax becomes due or is paid, whichever is later.

Two categories sit outside the schedule entirely and should be kept for as long as you own the thing, plus the period of limitations for the year you dispose of it in a taxable sale. If the property came out of a like-kind exchange, the records on what you gave up stay live too, because they set the basis on what you hold now.

Asset records. Purchase invoices, closing statements, improvement receipts, and depreciation schedules for anything you own. You need these to compute gain or loss on sale, which may be twenty years from now. A building bought in 2011 and sold in 2032 needs its 2011 paperwork in 2032.

Entity and formation records. Articles, operating agreements, partnership agreements, minutes, stock or membership records, buy-sell agreements. Keep these permanently. Keep copies of filed tax returns indefinitely as a matter of practice — the IRS tells you to keep them and never sets an end date, and reconstructing one is far harder than storing it.

The clock starts on the return, not on the receipt. A 2026 expense supporting a return filed in 2027 is on the 2027 clock.

What counts as a record

Publication 583 is specific about supporting documents, and the categories are worth knowing because they map to what an examiner will ask for.

  • Income: deposit slips, invoices, receipt books, credit card and processor settlement records, register tapes
  • Purchases and inventory: invoices and canceled checks for goods bought for resale, with proof of payment
  • Expenses: invoices, canceled checks, account statements, credit card slips, petty cash slips
  • Assets: purchase and sales invoices, closing statements, records of improvements
  • Payroll and travel: their own rules, in Publications 15 and 463 respectively

Two things about the format. Electronic records are acceptable, so a clean scan or a PDF from the vendor is fine. And a credit card statement alone is generally not adequate substantiation for a business expense, because it shows the amount and the merchant but not the business purpose. The statement plus the itemized receipt plus a note on what it was for is the complete record.

Vehicles, meals, and the two that get disallowed most

These categories carry heightened substantiation requirements, meaning the documentation standard is stricter and the deduction is more commonly disallowed when it's thin.

Mileage. A log showing the date, the destination, the business purpose, and the miles — plus your total miles for the year, because the deduction turns on business-use percentage and Schedule C asks for business, commuting, and personal miles separately. Keep it at or near the time. A log rebuilt the following March from a calendar is weaker evidence rather than automatically fatal, but it isn't a position you want to be arguing from. Note that the standard mileage rate moved mid-year in 2026: 72.5 cents per mile for January 1 through June 30, and 76 cents per mile from July 1 forward under IRS Announcement 2026-11. If you use the standard rate, your log needs to distinguish the two halves of the year, and a single annual mileage total won't compute correctly.

Meals. The amount, the date, the place, the business purpose, and who was at the table. The first four are the statutory elements. The fifth earns its place because a business meal is only deductible if you or an employee was present and the food went to a business associate, and nothing but your own record establishes either. A receipt with no names and no purpose is a receipt for lunch.

For anyone running vehicles at scale, a contractor with a fleet or providers driving between sites, this is worth systematizing rather than leaving to individual habit. Apps that log automatically and export monthly cost very little and eliminate the reconstruction problem entirely.

A filing system that holds up

The rule of thumb is that a record you cannot find in five minutes is a record you do not have.

  • Organize by year, then by type of income or expense, exactly as Publication 583 suggests
  • Attach source documents to transactions in your accounting file, so the receipt lives with the entry rather than in a parallel universe
  • Keep one durable archive per closed year, backed up somewhere that isn't the same laptop
  • Set a shred date on the folder when you file it, so the cabinet clears itself
  • Before you dispose of anything, check whether your state, your lender, your bonding agent, or your insurer requires longer retention. Several do, and their clocks are independent of the IRS

If your accounting workflow already attaches documentation at the point of entry, most of this becomes automatic. That's part of what a well-run monthly close produces, and part of what the bookkeeping work is for: not just correct numbers, but a defensible trail behind each one.

What to do next

Pick your oldest tax year on the shelf and decide, in writing, what its retention date is. Then do the current year properly from here forward, which is a smaller job than fixing the past and prevents the next decade of the same problem.

If you'd like your documentation workflow set up so the records file themselves, book a free discovery call.

This is general information, not tax advice for your specific situation. Confirm retention decisions with your tax preparer, especially where an audit, a loan, or a sale may be involved.