How Can a Company Prepare Its Books Before an External Audit?

Clean-up fails when the books keep changing underneath it. Before you start, agree a cutoff date for transaction posting, then lock the audit period in the accounting system so later changes require a deliberate unlock.

Next, confirm opening balances. If the prior year was audited, opening balances must match those statements exactly, including any audit adjustments that were never booked. If this is a first audit, the auditor will also need evidence supporting the opening balance sheet, so the prior-year closing balances deserve the same scrutiny as the current year.

Agree with management who may post entries during the clean-up, and keep a short log of every correcting entry with its reason. That log later becomes the explanation the auditor asks for when a balance differs from the version first sent.

1. Cash. Reconcile every bank, card, fintech and payment-processor account for each month-end, not just year-end. Unreconciled differences at month 4 tend to be the cause of unexplained items at month 12.
2. Receivables and revenue. Agree the AR aging to the ledger, write off or reserve balances that will not be collected, and check that invoices around year-end are in the right period.
3. Prepaid expenses. List annual subscriptions, insurance and deposits; amortize them over the period they cover rather than expensing them when paid.
4. Fixed assets and capitalized costs. Roll forward cost and accumulated depreciation, add the year's purchases, and remove disposals.
5. Payables and accruals. Review bills received and payments made after year-end and record any that relate to the audit year. Accrue payroll, bonuses, professional fees and interest.
6. Deferred revenue. Reconcile to the billing system and contract terms.
7. Debt. Agree principal and accrued interest to lender statements.
8. Equity. Roll forward from opening to closing, matching each issuance, SAFE, conversion and option to a signed document and the cap table.
9. Intercompany and related parties. Agree balances with the parent or related company and document each one.

Many small companies keep books on a cash basis and make a few year-end adjustments for tax. Audited US GAAP statements require accrual accounting throughout. The practical conversion steps are:

• Record customer invoices when issued and revenue when earned, not when cash arrives.
• Record vendor bills in the period the service was received.
• Separate payment-processor gross receipts from fees and refunds so revenue is not reported net.
• Reverse year-end tax-only adjustments that do not belong in GAAP statements.

Cutoff is where small errors cluster. A consulting invoice dated 2 January for December work, or a December customer payment for a January subscription, will be picked up in the auditor's sample if it is in the wrong year.

Accounts named "uncategorized", "ask accountant", "suspense" or "owner clearing" should be zero at year-end. Each remaining item needs to be classified to an expense, asset, liability or equity account with a document behind it.

Auditors review journal entries for those posted manually, at unusual times, by unusual users or to unusual accounts. Give every manual entry a plain description ("Accrue December legal fees per invoice 1045") and attach or reference the support. This single habit removes a large share of audit questions.

Once the balances are clean, compare each account to the prior year and, for income-statement lines, to the monthly trend. For every movement above a threshold you set (for example a percentage and a dollar amount), write one or two sentences explaining it: a new customer contract, a price change, a new hire, a one-time legal matter.

Auditors perform the same analytical procedures. When your explanations already exist and are supported, the conversation is short. When they do not, each unexplained movement becomes a request for detail.