Once you’ve accessed more than your 25% tax-free cash from your pension, the amount you can continue to contribute to a pension each year is cut dramatically, from a maximum of £60,000 to just £10,000. This is known as the Money Purchase Annual Allowance.
It was brought in to prevent ‘pension recycling’, where you take pension cash and reinvest it into another pension to gain further tax relief.
Note that if you’re in a capped drawdown contract from prior to April 2015 and remain in capped drawdown, you can still contribute the full non-reduced annual allowance of £60,000 to your pension unless you break the cap on what you can draw from your pension under the rules of capped drawdown.