The short answer

Save the written terms with the original work order, invoice and equipment ID so a future problem can be checked against the actual coverage.

Hammer, pliers, adjustable wrench, screwdriver, and small hardware arranged on a worn workbench.
Illustrative stock photo · Photo: energepic.com / Pexels · Pexels License

Record the boundaries

Note the start date, stated duration, covered work, exclusions and contact method. Leave uncertain terms marked as questions. When a fault returns, describe the symptom without asserting coverage before the contractor has reviewed it.

IRS guidance identifies invoices and purchase records as supporting business documents. [1]

A note saying “under warranty” is too vague. “Labor warranty document attached to invoice 612; contractor review requested” tells the next person what exists and what still needs confirmation. Warranty coverage is not the same as a safety recall remedy.

Sources

This article was generated by AI using the sources below. Editorial standards.

  1. What kind of records should I keep? — IRSSupports the attributed passage: IRS guidance identifies invoices and purchase records as supporting business documents. The practical workflow and labeled examples are the publication’s own applications, not source-reported cases. Source checked Sep 8, 2026.

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