Tax term
A taxpayer in a 40% band does not pay 40% of everything — only of the slice above that band's threshold. Quoting a marginal rate as though it were the overall rate overstates the bill substantially.
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Everything here states what it does not cover.
A guide that applies to one country and one tax year says so at the top, and cites the section it relies on. Read one before you decide whether any of this is for you.
Decision support, not tax advice. A professional reviews before anything is filed.