The government places a limit on the tax-free amount of money that can be saved into a DC pension and/or built up in a DB pension each year. This is currently £40,000 a year. You can save more than this into your pension in a year, if you wish, but any contributions above this amount would not receive tax relief.
Your Annual Allowance may be reduced if you earn more than £200,000 a year. It would also be reduced if you have flexibly accessed any other pension plans. If you think you may be affected by the Annual Allowance, you can find out more using the modeller.