The tools

Last reviewed 1 September 2026 · How Tax Letters checks its facts

The checkers are free, need no account, and run in your browser. Each tool says plainly what it can and cannot tell you.

• Simple Assessment checkerCompare your PA302 letter's figures against your own records, line by line. The 60-day route explained if anything differs.
• Letter checkerPaste any HMRC letter and get a plain-English identification, its honest deadline, and your options.
• Scam checkThe checks that settle whether contact is really from HMRC, using GOV.UK's own lists.
• The deadline decoderThe three kinds of deadline in HMRC letters, and how to tell which one is looking at you.
• Missed the date?Where you actually stand when the date in a letter has passed, and what to do now.