Define what accounting software must own
The accounting system should normally be the authoritative record for reconciled income, expenses, assets, liabilities, and financial statements. Your photography CRM may create invoices and track client balances, while the accounting platform records the resulting financial activity. Assign ownership so the same invoice is not accidentally created or edited in two places.
Put it into practice: Write a one-page systems map covering leads, invoices, payments, refunds, processor fees, bank deposits, expenses, receipts, sales tax, and reports.
Useful evidence: Every financial record has one authoritative home and a documented handoff.