Paying HMRC late will cost you even more

Lets start with the good news, overpaying HMRC or paying them ahead of time will earn you interest of 4.25% from 22nd August 2023. 
Which in terms of interest rates available isn’t actually a bad one! 

There’s loads to consider with the timing of paying your tax bill, but if you do pay it early that interest rate may factor into your decision making.

Paying it late however, is becoming even more expensive with the interest HMRC charge you for paying late increasing to 7.75% from 22nd August 2023.