Trading income allowance

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Hi not sure if I'm in the right forum.
When I fill my tax return in April, I normally put my gross turnover (box 9) then take my expenses off (box 20) and put my net profit in box 21.
This year I'm going to be using the £1000 trading allowance.
So after I do my gross turnover and £1000 trading allowance (box 10.1) where do I put my net amount? as there doesn't seem to be a box.
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