Set up an appropriate chart of accounts and enter opening balances before importing transactions. Reconcile one account against a real statement, then confirm that income, expenses, assets and liabilities appear correctly in the reports.
Use scheduled backups and keep supporting documents organized outside or alongside the accounting file. GnuCash offers substantial accounting control, but that also requires consistent bookkeeping practices. Verify tax treatment and reporting needs for your jurisdiction before making it the sole record of a business.
