Yes, you can have both a SIPP and your existing workplace pension, and this can be a flexible way to top up your retirement savings tax-efficiently. If you have access to a workplace pension, make sure you’re maximising any employer contributions before deciding whether to pay into a SIPP. You’ll also need to make sure the money put in across all your pensions each year (including any basic rate tax relief added by the government) doesn't go over the total pension annual allowance of £60,000.