Terms of use

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

• Information, not advice. Everything on Tax Letters, the checkers' output included, is general information about letter types, rules and arithmetic. It is not tax, legal or financial advice, it does not know your circumstances, and decisions about your own affairs should be made with a qualified adviser or with HMRC directly.
• The comparison is mechanical. The Simple Assessment checker compares the figures you type, exactly as you type them. It cannot know about income your documents do not show, and a match or a difference is a statement about your inputs, not a ruling on your tax position.
• The letter checker is AI and is labelled as such. It selects from human-reviewed explanations, it can still misidentify a letter, and it cannot verify that any letter is genuine. Check genuineness against GOV.UK's own lists.
• Dates matter. Every page shows when it was last reviewed, and every figure is recorded with its source and the date it was last checked. If a page's review date is old, treat it with proportionate caution and check the primary source it cites.
• Tax Letters is independent. It has no connection to HMRC or any government body. Where Crown material is quoted or linked it is used under the Open Government Licence v3.0, with no suggestion of official status or endorsement.
• Liability. We take accuracy seriously, source every claim, and correct errors when shown them. To the extent the law allows, we are not liable for losses arising from reliance on general information here; nothing in these terms limits liability that cannot lawfully be limited.
• Fair use. Do not scrape the site into a competing service, misrepresent its content, or use the checkers to process other people's letters without their knowledge. Helping someone with their letter, with them, is what the tools are for.