Places we'd actually send you.
Serenity Tax is a planning tool, not the final word. These are the official and independent resources worth checking alongside it.
Official
How Income Tax works, current rates, and how to check what you owe.
National Insurance — gov.ukWhat National Insurance pays for and how much you pay at each threshold.
Self Assessment tax returns — gov.ukWho needs to file, key deadlines, and how payments on account work.
File your Self Assessment — gov.ukSign in to HMRC's own portal to file or check your return.
Repaying your student loan — gov.ukThresholds and repayment rates for all student loan plans.
Scottish Income Tax — mygov.scotScotland's separate Income Tax bands, which apply to salary and profit (not dividends).
Getting further help
Free, impartial, government-backed guidance on tax, budgeting and money more broadly.
Citizens AdviceFree, independent advice if your situation is more complicated than a calculator can cover.
Low Incomes Tax Reform Group (LITRG)Plain-English tax guidance aimed at people who can't easily afford professional advice.