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Keep the confirmation for as long as the document it refers to could still matter. Tax filings and legal papers call for years of retention; routine business confirmations can usually go after months. There is no single rule: the confirmation proves when you sent what, so it should live exactly as long as that fact could be challenged.
| Document type | Keep the confirmation | Why |
|---|---|---|
| Tax filings and estimated payments | At least seven years | Matches the longest common audit lookback; accountants generally advise seven years as the safe window |
| Legal correspondence and filings | As long as the matter is open, plus several years | Disputes over deadlines can surface years later; the confirmation timestamps service and filing |
| Medical and insurance claims | Until the claim, appeal, and any dispute are fully closed | Insurers can question timely filing months after submission |
| Routine business faxes (orders, requests) | One to three years | Covers most warranty and billing dispute windows |
| One-off administrative faxes | A few months after confirmation of receipt | Once the other side confirms they have it, the proof has done its job |
Two facts, and only two: that a transmission started at a recorded date and time, and that it completed successfully to a specific fax number. It does not prove the recipient read the pages, printed them clearly, or routed them to the right desk. That limitation matters when you decide what to keep. If the stakes are high, pair the confirmation with a follow-up call the same day and note who you spoke with. A written log of that call, kept with the confirmation, turns "it sent" into "they received it."
Yes. A confirmation page separated from the document it covers is nearly useless: nobody can reconstruct what "3 pages to 202-555-0148" meant two years later. Staple or file them together, or store the confirmation image in the same folder as the scanned document with a matching filename. If you use an online fax service like LetterAgent's fax (currently in testing for US and Canadian numbers), your confirmations live as digital records; download or screenshot the key ones so you are not depending on a dashboard you might stop using.
Old-school thermal fax paper is notorious for fading: the print can go blank within a year or two, especially in heat or sunlight. If any of your confirmations are on thermal paper, photocopy or scan them now and treat the scan as the archive. For digital confirmations, keep at least one backup copy outside the fax service itself. Name files with the date and recipient ("2026-10-08_insurer_claim.pdf") so a future you, or your accountant, can find them without opening every file.
Tax documents deserve the long end of the scale. The IRS generally has three years to audit a return, longer if income was underreported, so accountants commonly advise keeping returns and all proof of filing for at least seven years. Faxing a form to the IRS or your state revenue agency falls under the same rule: keep the confirmation with the return. For legal documents, keep confirmations for the life of the obligation plus the local limitation period for disputes, which varies by jurisdiction and claim type. When in doubt, keep it. A confirmation costs a few kilobytes to store; a missing one can cost a deadline.
Deletion is fine once the retention period passes, but shred the habit of deleting by gut feel. Set a simple review: once a year, go through confirmations older than your cutoffs and delete the expired ones in a batch. That keeps the archive useful instead of turning it into a pile nobody trusts. Sensitive documents (medical, financial, legal) should be deleted securely, not just dropped in the recycle bin, if your copies sit on a shared or work machine.
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