Dioge9es

I understand that hmrc pays 4% currently on credit balances on personal tax accounts? Does it make sense to pay the tax now and not wait till January? If this interest is not taxable, then the rate is effectively better than I can get in a normal savings account. (I'm a higher rate tax payer, so any interest earned there is taxable at 40% - earn more than the £500 savings allowance). Is my reasoning correct?