Year-end audit preparation in Nigeria should start about 11 weeks before 31 December, not in January. If your books are reconciled, your schedules are supported and your IFRS adjustments are agreed before the auditors arrive, fieldwork is shorter, fees are lower and you are far more likely to meet the filing deadline. This checklist tells you what to do, and when.
The clock matters. Under the current rules summarised by PwC Tax Summaries, a company files its annual income tax return within six months after the end of its financial year, and the filing must include audited financial statements prepared under IFRS. For a 31 December 2026 year-end, that is 30 June 2027.
Why does year-end audit preparation matter in Nigeria?
Because the audit is a filing requirement, not an optional extra. The audited accounts go to the NRS with your tax computation, your signed self-assessment form and evidence of payment. A delayed audit means a delayed return.
The cost of delay is concrete. PwC reports an administrative penalty of ₦100,000 for the first month of default and ₦50,000 for each month after that. Late payment of tax adds 10% of the unpaid amount plus interest. Companies must also file annual returns with the CAC, within 42 days after the AGM under sections 417 to 419 of CAMA 2020, and those returns go in alongside the audited accounts.
What should you do in each phase before year-end?
Treat the next 11 weeks as three phases. Each one has a short list of jobs and an owner.
Phase 1: how do you clean up the books?
- Reconcile every bank account. Include dormant and foreign-currency accounts. Auditors send confirmation letters to banks, so any gap between your ledger and the bank will surface.
- Age your debtors and creditors. Match balances to statements from customers and suppliers. Old, disputed balances need a decision now, not at the audit.
- Check the fixed asset register. Tag assets, confirm they exist and still work, and remove disposals. Depreciation should agree to the ledger.
- Clear suspense and clearing accounts. An unexplained balance is the first thing an auditor queries.
Phase 2: which judgements should you settle early?
These are the areas where auditors and management most often disagree. Settling them early is cheaper than arguing in January.
- Expected credit losses and impairment. Document how you estimated them. A one-line note will not satisfy an audit file.
- Provisions and contingent liabilities. List open disputes, tax assessments and legal claims, with a lawyer's view where you have one.
- Leases and borrowings. Agree schedules to lender statements and lease contracts, including interest accrued but unpaid.
- Tax balances. Reconcile VAT, withholding tax credits and PAYE to what you filed on Rev360. Mismatches between filed returns and the ledger are a common audit finding.
If you report under IFRS, remember that IFRS 18 applies from 1 January 2027, so your 2026 accounts become comparatives. Our guide on IFRS 18 in Nigeria explains what to prepare.
Phase 3: what do you need ready before the auditors arrive?
- Stock count. Agree the date with your auditors so they can attend. Count sheets must be numbered, signed and reconciled to the ledger.
- Cut-off. Record the last goods received and last invoices issued before the year-end, so sales and purchases land in the right period.
- PBC list. Ask your auditor for the list of documents they expect (prepared by client). Assign each item to a named person with a date.
- Supporting files. Contracts, board minutes, payroll summaries, bank statements and tax filings should sit in one indexed folder. Our post on how long to keep tax records covers what to retain.
What do auditors look for first?
Most queries come from the same places: unreconciled bank balances, unsupported journals posted near year-end, stock that does not match the count, receivables that nobody expects to collect, and tax balances that differ from filed returns. If you fix those five, the rest of the audit usually moves quickly.
An audit is also a dress rehearsal for an NRS review. The same records the auditor asks for are the ones the NRS will request. Our checklist on preparing for an NRS tax audit shows how the two line up.
What this means for your business
The finance team's workload is front-loaded now so that January is quiet. Set a date for each phase, name an owner for each task, and hold a short weekly review until the PBC list is closed. If the audit slips, so does your tax return, and the penalties above start to run.
Smaller companies should check carefully before assuming they are exempt from audit or from filing. Exemption thresholds depend on turnover, assets and company type, and the answer affects both CAC and NRS filings.
FAQ
When should we start year-end audit preparation in Nigeria?
Eleven to twelve weeks before the year-end is a sensible start. That gives you time to reconcile accounts, settle judgements and brief your auditors before December closes.
What is the deadline to file a company income tax return with audited accounts?
Within six months after the end of the financial year, according to PwC Tax Summaries. For a 31 December 2026 year-end, that is 30 June 2027. The NRS may grant an extension of up to two months at its discretion.
What happens if the audit is late and we miss the filing date?
PwC reports a penalty of ₦100,000 for the first month and ₦50,000 for each later month. Any unpaid tax also attracts a 10% penalty plus interest.
Need help getting your books audit-ready before 31 December? Contact VOG Global in Area 10, Garki, Abuja, or visit vog.global to book an audit-readiness review with our team.