Guides
Longer explanations of the rules behind the calculators, with worked examples and links to the official sources.
- The £100,000 tax trapWhy pay between £100,000 and £125,140 is taxed at 60%, and what reduces it.
- How to read your payslipWhat each line means, what tax code 1257L tells you, and how to spot a mistake.
- Cash ISA changes from April 2027The new £12,000 cash limit for under-65s, what stays the same, and where the rules stand.