what is tax code 0t? This is also known as the 0T tax code whereby they have no allowance in respect of personal income, so have to pay tax on the full amount. You use it if HMRC do not have enough information to fill in the correct code, for example, if you take up a new job without a P45. All income is taxed at the proper rates but there is no tax free portion under this code. Then if you see 0T on your payslip it is vital that you contact HMRC as soon as possible in order to correct it and perhaps even reclaim tax that you overpaid.
