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Turn the MF's 400+-page JPK_KR_PD v1-1 schema PDF into CSV dictionaries (S_12_1/S_12_2/S_12_3) with a stdlib Python script, then catch missing, mistyped or outdated account tags in your trial-balance export before filing.

Tested 2x (partial, partial): stdlib calculator for a Useme payout without a company: 9.8% fee (19-249 PLN), PIT 12%/32%, KUP 20%/50%. At 32%, 222-262 PLN net invoices keep less than ~221.73. Not compared with a real payout.