The amount he can move into a pension is limited. It's possible his annual taxable earning are less. For most ordinary people, the max contribution is your taxable earnings in that tax year. Basic tax will be rebated into the pension fund. If you have low, or no, taxable earnings, you can contribute up to £2880 per year (which will receive basic tax rebate and be grossed up to £3600 in the pension, even if you did not pay tax. This is a special concessions to low earners enabling them to build up a modest pension.