Personal Pension Scheme and Personal allowance.

Good Evening,

I understand that for personal pension schemes there isn’t deduction of contributions before PAYE contrarily to the occupational pension schemes.
My question is, if a self-employed has 125,000 trading income, and contributes 15,000 gross to a personal pension scheme will he still get the following Personal allowance:

125,000 less Pension contribution 15,000 = 110,000
Income in excess of 100,000 limit / 2 : 10,000/2= 5,000
Reduction P.A= 10,000 – 5,000 = 5,000

I know the basic and higher band would be extended by 15,000 each, but It’s not clear to me how contributions affect net income in the case of personal schemes.

Many thanks!