When your income is over a certain level, the government takes tax from your earnings.
You can see this on your payslip. If you put money into a pension scheme, it qualifies for tax relief.
This means that as well as the money you’re putting in, some of your money that would have gone to the government as tax now goes into your pension pot instead.
This is one of the benefits of a pension over a traditional savings account, and is why pensions are so important.
Even if you don't earn enough to pay tax, you may still be able to make contributions up to £2,880 a year with tax relief making them up £3,600.