In the UK, it is the employee's responsibility to pay their own taxes to HM Revenue and Customs (HMRC) through the Pay As You Earn (PAYE) system. This means that your employer will deduct income tax and National Insurance contributions from your pay before you receive it, and then pay these amounts to HMRC on your behalf.
Your employer is responsible for ensuring that the correct amount of tax and National Insurance contributions are deducted from your pay, based on your income and tax code. They must also provide you with a payslip each time you are paid, which shows your gross pay, deductions, and net pay.
If you have any questions or concerns about your tax payments, you should contact HMRC or seek advice from a qualified tax professional