Income Tax & NI
What comes out of your payslip and why.
PAYE, tax codes and National Insurance
How tax is taken from your salary automatically, what your tax code means, and how to spot (and fix) being on the wrong one.
Getting your National Insurance number
Who needs to apply, who already has one via their visa, and how to apply — you can usually start work before it arrives.
Self-assessment: who must file and how
Side income, self-employment, or high earnings? The HMRC self-assessment deadlines, registration, and penalties to avoid.