Build reliable source records
A dependable system starts with separate business accounts, a useful chart of accounts, consistent transaction capture, and a place for receipts, invoices, contracts, payroll reports, and tax documents. Accounting software supports the process, but it does not replace the review and controls that make the records reliable.
The IRS explains that a business may choose a recordkeeping system suited to its operation as long as it clearly shows income and expenses. See the agency's business recordkeeping guidance.

