You must get fiat somewhere if you only accept bitcoin as payment and your inputs can't be paid in bitcoin

If i spend $1000 to earn $1200 i can buy $200 of btc and reinvest the $1000 to repeat

If i spend $1000 to make $1200 in sats i have 12,000 sats

and $0 to repeat

So..

a) $1000 of fiat comes from outside the business

b) sell $1000 of bitcoin and pay the tax & accounting

c) buy ALL the inputs in bitcoin in btc and don't pay any tax