Taxpayers are being urged to check their payslips and pension paperwork for errors that could be costing them money – with 5.6 million Brits paying too much income tax due mainly to tax code mistakes.

Millions are missing out on a £689 from HMRC – and an easy tax code check can see if you’re owed cash. Thousands of workers up and down the UK are thought to be on the wrong tax code, meaning they’re ...