Skip to content
BritIndex
4 guides

Money, tax & National Insurance

PAYE and tax codes, Self Assessment, National Insurance, ISAs, student loans and Universal Credit — what you owe, what you are owed, and when.

How to check your tax code is rightWrong tax codes are the most common way people in the UK overpay tax, and HMRC does not always spot it. This decodes what each let…7 minverified 2026-07-30
How to file a Self Assessment tax returnOnline returns are due by 31 January, and registering late is the mistake that costs most first-time filers. This covers who must …8 minverified 2026-07-30
How to get a National Insurance numberA National Insurance number is free, permanent and issued by HMRC. You can start work without one. This covers who needs to apply,…7 minverified 2026-07-30
National Insurance explainedA second income tax with a contributory record attached. What the classes mean, why 35 qualifying years matters more than the amou…9 minverified 2026-07-30
Other topicsArriving & settling inGovernment services & IDWork & employmentHousing & rentingDriving & transportNHS & healthBills & utilitiesEducation & studyConsumer rights & complaintsScams, safety & emergenciesTravel & things to do