databutler.dev · /facts — every fact · Verified Facts protocol · /.well-known/facts.json · /changes

Register by (new to Self Assessment for 2025-26)

2026-10-05 date

standing figure · verified 2026-10-04 against the official source

You must tell HM Revenue and Customs (HMRC) by 5 October 2026 if you need to complete a tax return for the previous tax year

key

uk/gov/self-assessment/register-by

value

2026-10-05 date

period

—

effective

— to date

source

https://www.gov.uk/register-for-self-assessment

verified

2026-10-04 — fresh (33 days ago; next check by 2026-11-03)

next expected change

none named (irregular: changed by statute or order on no fixed date)

source checked

2026-11-02 (the newest day the automated check fetched the source page)

scope

UK Self Assessment for the 2025-26 tax year (6 April 2025 to 5 April 2026); dates roll forward each year.

hash

sha256:a6c0c44ea8cfae63ac04ccd5c57175777b4e4ade2b9e496c338eaf116229b28e

signature

EdDSA, key db-2026-10 — keys

As JSON

curl -s https://databutler.dev/f/uk/gov/self-assessment/register-by?max_age=30d — schema; verify with npx verified-facts verify https://databutler.dev/f/uk/gov/self-assessment/register-by

{
  "protocol": "verified-facts/0.3",
  "key": "uk/gov/self-assessment/register-by",
  "aliases": [
    "uk/gov/tax-return/register-by",
    "uk/gov/sa/register-by",
    "uk/gov/self-assessment-deadline/register-by",
    "uk/gov/mtd/register-by",
    "uk/gov/making-tax-digital/register-by"
  ],
  "label": "Register by (new to Self Assessment for 2025-26)",
  "value": "2026-10-05",
  "unit": "date",
  "period": null,
  "effectiveFrom": null,
  "effectiveTo": null,
  "source": "https://www.gov.uk/register-for-self-assessment",
  "quote": "You must tell HM Revenue and Customs (HMRC) by 5 October 2026 if you need to complete a tax return for the previous tax year",
  "verifiedDate": "2026-10-04",
  "nextScheduledRefresh": "2026-11-03",
  "changeCadence": "irregular",
  "nextExpectedChange": null,
  "sourceCheckedAt": "2026-11-02",
  "status": "fresh",
  "ageDays": 33,
  "maxAgeDays": null,
  "scope": "UK Self Assessment for the 2025-26 tax year (6 April 2025 to 5 April 2026); dates roll forward each year.",
  "hash": "sha256:a6c0c44ea8cfae63ac04ccd5c57175777b4e4ade2b9e496c338eaf116229b28e",
  "signature": {
    "alg": "EdDSA",
    "kid": "db-2026-10",
    "jws": "eyJhbGciOiJFZERTQSIsImtpZCI6ImRiLTIwMjYtMTAifQ..a9qQSj2xyYV2iFDrTL6FDe-IWz1JVi9wDIdSymm7Uz5rOSYFcbhYLtbPKxtaVnAbsPZFMTp4uIYAjyMXfXlGAg",
    "keys": "https://databutler.dev/.well-known/jwks.json"
  },
  "publisher": {
    "name": "Data Butler",
    "url": "https://databutler.dev/"
  },
  "cite": {
    "url": "https://databutler.dev/facts/uk/gov/self-assessment/register-by",
    "text": "databutler.dev, verified 2026-10-04 against https://www.gov.uk/register-for-self-assessment"
  }
}