Moneybox will automatically claim the basic rate of tax relief (20%) from HMRC on your behalf and invest this into your personal pension - this works out as a 25% top-up. This means for every £100 you put into your pension, the government will add a further £25, and this will be invested in the same way as your contribution.
If you pay a higher tax rate, you will need to apply for additional tax relief through a self-assessment tax return or by contacting HMRC.