This can't be right, can it??
SIPP rules - you can pay 100% of your wages into a SIPP up to a maximum of £60k, or your full wage (whichever is smaller). The amount you can pay in includes the 25% tax relief.
An example of a low paid person:
In a single year.
Wages £20k (maybe part time hours?).
Total pension contributions into a SIPP, £16k.
Additional tax relief rebate is £4k
Total into the SIPP = £20k (100% of wages and so within the rules),
But!
Tax was only paid on £20k minus personal allowance of £12.5k, so £7.5k is taxable.
Tax paid is 20% of £7.5k, so £1.5k. Tax rebate is £4000!
The upshot of this is that wages were £20k minus £1.5k tax, so £18.5k.
£16k paid into the SIPP becomes £20k with the tax rebate.
So there is a net gain onto incomings of £2.5k, due to the tax rebate!
National Insurance wasn't factored in, but is this correct, and legal?
Somebody paying into a workplace pension wouldn't get this gain, as they simply wouldn't pay tax in the first place (due to the way tax/contributions are calculated/deducted).
The figures aren't right, but this situation is a real one.