Financial expert Martin Lewis is urging workers to check their pay slips to make sure their take-home salary is correct. It comes a month after the start of the new tax year, which brought changes to how much employees are deducted.
Mr Lewis said workers should make sure they are not being overcharged by the tax office. This involved making sure you're on the right tax code.
If it's wrong, you might be able to reclaim any overpaid tax, reports the Mirror. By the same virtue, checking your pay slip will also alert you if you're paying too little tax, meaning you can "avoid a future nightmare", said Mr Lewis.