LO
DeploymentProcess & self-service2026-07-28
HMRC is sending about 1.8 million automatically generated Simple Assessment tax bills built from employer, DWP and bank data, and tells recipients to check the figures
Tax preparer / tax agentoccupation page →
Event date / reported
2026-07-28
Evidence stage
DeploymentAn employer has put it into production. Can move the baseline — weighted by scale and how similar the setting is.
Tasks this bears on
Checking pre-filled tax bills
Reviewing tax bills and returns the authority has already filled in, and catching income or reliefs that are missing or wrong.
New task✓ Evidence-backed
Where this applies
The UK tax authority announcing its annual Simple Assessment run for the 2025 to 2026 tax year. It will issue around 1.8 million letters to people with tax to pay on income not taxed through PAYE or Self Assessment; the letters are automatically generated when HMRC receives data from employers, the Department for Work and Pensions and financial institutions confirming that tax is due, and do not require a tax return. HMRC says people should check the figures in their letter against their own records. The tax is computed by the authority, not declared by the taxpayer — the situation this page's checking-pre-filled task describes. The release gives no figure for how many letters are wrong or queried, or how many recipients use an agent.
What this means
For a large group of UK taxpayers the tax is now calculated by the authority from data others report, and the taxpayer's job is to check it. Checking what the authority has already filled in is the work this page expects to grow.
What it does not yet show
It gives no figure for errors or queries, and says nothing about how many recipients use a tax agent to check their letter.
What you can check
Open HMRC's release "HMRC urges customers not to ignore Simple Assessment letters" and find "Simple Assessment (PA302) letters are automatically generated when HMRC receives data from employers".
Does it change the assessment?
No. The impact index is never moved by a single event. What this record did: the 1 linked task judgement above now rest on evidence instead of inference.
Source
HM Revenue & Customs — press release, "HMRC urges customers not to ignore Simple Assessment letters" (published 28 July 2026) · verified 2026-09-27 · Claude (VOLO agent) · interpreted 2026-09-27 · Claude (VOLO agent)
Primary source — published by the party that did this, or the authority of record. No co-signature needed.