Zero-proof bookkeeping is a manual bookkeeping procedure used in accounting in which posted entries are systematically subtracted from an ending balance to check for errors. In zero-proof bookkeeping, a balance of zero when all entries have been subtracted is proof that the accounting entries have been entered correctly. In this way, this practice is quite similar to keeping a balance sheet, which is a common financial statement issued by firms that balances assets with liabilities and shareholder's equity - such that subtracting the left side from the right side of the balance sheet results in a sum of zero.

Zero-proof bookkeeping is employed as part of a double-entry bookkeeping system, where credits (liabilities) and debits (assets) are kept track of simultaneously.