This document summarizes 10 common and costly pension mistakes that many British people make. These mistakes include not saving enough for retirement, delaying saving which reduces the power of compound returns, failing to regularly check pension pots and investments, ignoring fees which can significantly reduce the overall value of a pension, relying too heavily on inheritances to fund retirement, not taking advantage of employer pension contributions, opting out of company pension schemes which forfeits employer matching contributions, assuming the state pension will be sufficient, not using pensions to save tax through tax relief on contributions, and accessing pensions early which incurs penalties. The document stresses that pension mistakes can be very expensive due to the long time horizon over retirement savings have to grow. It provides examples to