Result: a correct profit number without typing every coffee and taxi.

Old bookkeeping asks for every receipt. Most owners quit by week three. NapkinLedger flips it: you record the big items you already remember — sales, rent, stock, pay, owner money. About 90% of your money moves in 10% of your transactions.

Then once a month you confirm balances: type what each account really holds. The difference between expected and real is your small unrecorded spending. NapkinLedger adds it to your costs, so profit comes from reality, not from perfect typing.

One rule keeps it honest: this saves time, it does not replace proof. Keep invoices and receipts in one place for tax. If the monthly gap feels too big, record a few more items next month. See storing your paperwork.