Tom works full-time earning £35,000. His wife Laura is on maternity leave earning nothing this year. Tom goes to gov.uk/marriage-allowance and applies. Laura transfers £1,260 of her unused Personal Allowance to Tom. His tax bill drops by £252. It took 5 minutes.
Even better: they can backdate the claim up to 4 years. That's up to £1,258 as a one-off payment. It arrives as a cheque or adjustment to Tom's tax code. They had no idea this existed until a colleague mentioned it at lunch.
→ Action: Apply at gov.uk/marriage-allowance right now. It takes 5 minutes.