Your firm just won a new audit client. The partner signed the engagement letter, the fee was agreed, and the prior-year file is sitting on a USB stick from the predecessor auditor. The instinct is to start where any audit starts: materiality and risk assessment, then the planning memo. But a first-year engagement has at least six procedures that don't exist on a recurring audit. Miss any of them and you've created a file deficiency that's difficult to fix at completion.
I've seen first-year files where the team treated opening balances as a tick box exercise, copying the predecessor's numbers without independent verification. That approach fails inspection every time. A first-year audit engagement requires you to obtain evidence on opening balances ( ISA 510.6 ), communicate with the predecessor auditor ( ISA 510.8 ), confirm consistent accounting policies, and run risk assessment procedures that account for zero cumulative audit knowledge.
Key takeaways
- How to obtain evidence on opening balances when the predecessor auditor's file has gaps ( ISA 510.6 through 510.9)
- What to request from the predecessor auditor and how to evaluate what you receive ( ISA 510.8 )
- How to build a first-year planning file that compensates for zero cumulative audit knowledge
- What additional risk assessment procedures ISA 315.13 requires when you have no prior-period engagement experience
What makes a first-year engagement different
On a recurring engagement, you carry forward cumulative audit knowledge. You know the client's systems and you know where the risks sit. You know which management representations turned out to be reliable last year and which didn't. You have a prior-year (PY) file with tested balances. None of that exists on a first-year engagement.
ISA 510.3 defines the auditor's objective: obtain sufficient appropriate audit evidence about whether opening balances contain misstatements that materially affect the current period's financial statements (FS). Opening balances aren't just PY closing numbers. They include matters requiring disclosure that existed at the beginning of the period (contingent liabilities, commitments, related party relationships, and pending litigation). If the PY auditor qualified their opinion, the reason for that qualification may still affect the current period.
ISA 300.13 adds a first-year-specific planning requirement. The engagement partner (EP) must undertake additional activities before starting the audit, including establishing communication with the predecessor auditor (where one exists) and any additional procedures required by the firm's quality management system under ISQM 1. Your firm's quality manual likely has a section on acceptance procedures for new engagements. Check it before fieldwork. The EQCR or engagement acceptance review may require partner-level sign-off before substantive work begins.
The practical consequence is that a first-year engagement takes more hours per revenue euro than a recurring audit. Budget accordingly. The additional procedures (predecessor contact, opening balance work, extended understanding of the client, and building the permanent file) aren't overhead. They are the audit.
Communicating with the predecessor auditor
ISA 510.8 states that where the prior period was audited, the auditor shall request management's authorisation to contact the predecessor. If management refuses, ISA 510.9 treats that as a factor in deciding whether to accept the engagement. In practice, refusals are rare, but document the request and the response either way.
Once you have authorisation, contact the predecessor in writing. Request access to their working papers (WPs) (or at minimum, a meeting to review them), and specifically ask about: the reason the audit relationship ended (resignation, non-renewal, fee dispute, or dismissal), any disagreements with management on accounting treatments, any material matters communicated to those charged with governance under ISA 260 , and any fraud or suspected fraud identified during their tenure. Also ask whether they encountered scope limitations.
Not every predecessor auditor will cooperate fully. Some firms have policies restricting WP access. Others will allow a review meeting but not copy access. Whatever access you obtain, document it. Whatever access you don't obtain, document that too, along with the alternative procedures you performed to compensate ( ISA 510.10 ).
Watch for two things in the predecessor's file. First, areas where the predecessor obtained evidence through management representations alone, without corroborating evidence. Those areas need fresh testing in your opening balance work because management representations from the predecessor's engagement don't carry forward to yours. Second, any qualification or emphasis of matter in the predecessor's report. If they qualified on inventory valuation, you can't carry forward last year's inventory balance as your opening position. You need independent evidence that the opening inventory is not materially misstated.
What if there was no predecessor auditor?
For a first-time audit (the client was never audited before), the opening balance procedures are more extensive. You don't have a predecessor to contact. ISA 510.6 (b) requires alternative procedures, and for balance sheet items this often means substantive testing of the opening balances themselves. For a first-time audit of a company with €25M in fixed assets, you may need to verify the historical cost and accumulated depreciation of material asset classes back to source documentation. This is time-consuming and must be budgeted separately.
Obtaining evidence on opening balances
Opening balance work isn't about re-auditing the prior year. It's about confirming that the numbers you're starting from don't contain misstatements that will flow into the current period.
ISA 510.6 distinguishes between current assets and liabilities (where evidence about the opening balance is typically obtained through current-period procedures) and non-current items (where you may need to examine the predecessor's WPs or perform additional procedures). For trade receivables, the fact that PY receivables were collected in the current period provides evidence that the opening balance was not materially overstated. For fixed assets, you need to verify that the opening balance reflects properly recorded historical cost and accumulated depreciation.
Start with the PY audited FS. Compare every line item to your opening trial balance (TB). If any line differs from the PY audited figures, investigate the difference. It could be a reclassification or a prior-period adjustment, but it could also be an error. Document each difference and its resolution. The file should tell a story: a reviewer reading your opening balance section should be able to follow each material balance from the predecessor's audited figures through to your own tested position without needing to ask you a single question.
For revenue and expense accounts, opening balances are zero by definition (the accounts reset at the start of the period). But PY revenue recognition and expense accruals can create misstatements in the current period. If the prior auditor accepted a revenue cut-off position that was aggressive, the effect carries into your period. Review the predecessor's cut-off testing (if accessible) or perform your own cut-off procedures on transactions around the prior year-end.
For equity, trace the opening balance of each equity component to the PY audited FS and to the client's shareholder register, board resolutions, articles of association, and KVK registration. Any movements in equity (dividends declared, capital contributions, prior-period adjustments, or share issuances) need supporting documentation. The ISA 510 glossary entry on ciferi.com covers the evidence hierarchy for different balance sheet categories.
For provisions and estimates, the opening balance work is where you spend the most judgment. A provision for warranty claims of €800,000 carried forward from the prior year needs evaluation: was the methodology reasonable and has the provision settled close to the estimated amount? Are the assumptions still valid for the current period? ISA 540 applies to estimates in the current period, but the opening balance of an estimate is your starting point. If you can't verify it, you may need to report a scope limitation under ISA 510.11 .
Accounting policies
ISA 510.6 (c) requires you to evaluate whether the accounting policies reflected in the opening balances have been consistently applied in the current period. If the client changed its depreciation method or its revenue recognition policy between years, you need to evaluate whether the change was properly accounted for under IAS 8 and whether the opening balances were restated as required.
Compare the accounting policy notes in the PY FS to the draft current-year policies. Flag any differences for discussion with management. If the client adopted a new standard in the current period ( IFRS 16 leases, for instance, adopted late by a smaller client), the transition adjustments are part of your opening balance work.
First-year risk assessment: filling the knowledge gap
ISA 315.13 requires the auditor to obtain an understanding of the client and its environment. On a recurring engagement, much of this understanding carries forward. On a first-year engagement, you build it from scratch.
Structure your first-year risk assessment around four information sources that compensate for the missing cumulative knowledge: the predecessor auditor's file (already covered above), the client's own documentation, external sources, and your own analytical procedures.
From the client, request the articles of association, shareholders' register, organisational chart, most recent management accounts, board minutes for the current and prior year, any internal audit reports, and the quality management system documentation if the client is in a regulated industry. Read the board minutes cover to cover. On a recurring engagement, you might skim them. On a first-year, they're your primary window into management's decision-making and risk appetite.
From external sources, check the KVK (Chamber of Commerce) extract for registered charges, changes in directors, UBO registrations, and filed annual accounts. Review any industry reports relevant to the client's sector. For clients with public debt, check the most recent credit rating. For clients in regulated sectors, check the relevant regulator's register for sanctions, warnings, or enforcement actions.
Run analytical procedures on two years of financial data (the PY audited figures and the current-period management accounts). Use the ciferi ISA 520 analytical review calculator to compute ratios and trend analysis. On a first-year engagement, analytics serve two purposes: they inform risk assessment under ISA 315 and they help you identify unusual items in the opening balances.
Pay particular attention to related party transactions. ISA 550.13 requires the auditor to identify related parties, and on a first-year engagement you have no baseline. Request the related party list from management and cross-reference it to the KVK extract (for shared directors or shareholders). Review the PY disclosures separately. If the predecessor's file identified related parties that management's list doesn't include, ask why.
One point from experience: assign your most experienced team member to the first-year planning work, not the most junior. I've watched engagements go sideways because a second-year associate was left to build the planning file alone and missed an entire revenue stream in the risk assessment. Every downstream procedure was built on a flawed foundation, and the partner didn't catch it until review.
Worked example: Jansen Vastgoed B.V.
Client: Jansen Vastgoed B.V., a Dutch commercial real estate holding company. Revenue €9.5M (rental income), total assets €62M (investment properties €54M). Year-end 31 December 2024. First-year engagement. Predecessor auditor: mid-tier Dutch firm that resigned after a fee disagreement.
Step 1. Obtain management's authorisation to contact the predecessor.
Request written authorisation from the managing director, R. Jansen. Authorisation received 8 November 2024. Contact the predecessor EP by email. Request a review meeting and access to the PY WPs.
Documentation note: "Management authorisation to contact predecessor obtained 8 November 2024 (letter on file). Predecessor contacted by email 11 November. Review meeting scheduled 25 November. Predecessor confirmed the resignation was due to a fee disagreement. No disagreements on accounting treatments, no fraud identified, no scope limitations in the PY audit. Predecessor's opinion was unmodified. Meeting notes documented [WP ref]."
Step 2. Review predecessor's WPs and identify gaps.
At the review meeting, examine the predecessor's files on investment property valuation (the dominant balance at €54M), rental income recognition, borrowings, and related party transactions. The predecessor relied on an external valuation report from a RICS-registered valuer for investment properties. Revenue testing was substantive (analytical procedures plus detailed testing of lease agreements against rental income). Borrowing confirmations obtained from two banks. Related party transactions identified: management fees of €180,000 paid to R. Jansen Holding B.V., a company owned by the managing director.
Documentation note: "Predecessor WPs reviewed 25 November 2024. Key observations: investment property valued by RICS-registered external valuer (report dated October 2023, fair value €54M). Revenue tested substantively. Two bank confirmations obtained. Related party: management fee of €180K to R. Jansen Holding B.V. No areas where predecessor relied solely on management representations without corroboration. Predecessor's report was unmodified."
Step 3. Perform opening balance procedures.
For investment properties (€54M): obtain the PY valuation report and assess the valuer's competence and objectivity under ISA 620 . Compare the valuation to the amount recorded in the PY audited FS. Verify that no disposals or additions between the valuation date and year-end were unrecorded.
For rental income (€9.5M): obtain all active lease agreements. Recalculate expected rental income per lease for the prior year. Compare to recorded revenue. Investigate differences.
For borrowings (€28M across two loans): obtain the loan agreements. Confirm opening balances to the predecessor's bank confirmations. Recalculate the expected opening balance based on the repayment schedule.
For equity (€8.2M): trace to the PY audited FS and to the KVK extract for registered share capital.
Documentation note: "Opening balance procedures completed for all material balance sheet lines. Investment property opening balance of €54M agreed to PY valuation report and predecessor's WPs. Rental income: recalculated expected revenue from lease agreements; variance of €12K investigated and resolved (one lease amendment effective November 2023). Borrowings: confirmed to loan agreements and predecessor bank confirmations. Equity: traced to PY audited financials and KVK extract. No misstatements identified in opening balances. Conclusion: opening balances do not contain misstatements that materially affect the current period ( ISA 510.6 )."
Practical checklist for first-year engagements
Common mistakes
- Accepting the predecessor's audited FS as sufficient evidence for opening balances without performing any independent procedures. ISA 510.6 requires the auditor (not the predecessor) to obtain sufficient appropriate evidence. The FRC's Annual Inspection Results have flagged insufficient opening balance work as a recurring deficiency in first-year engagement files.
- Skipping the predecessor communication or treating it as a formality. The AFM has noted in its thematic reviews that first-year files often lack documentation of what was discussed with the predecessor and what access was obtained. Your file should also show what alternative procedures were performed for areas where access was limited.
- Applying the same risk assessment depth to a first-year engagement as to a recurring engagement. ISA 315.13 requires understanding the client and its environment, and on a first-year engagement this understanding starts at zero. A first-year planning file that's the same thickness as a recurring file is a first-year planning file that missed something.
- Treating opening balance work as a tick box exercise. If your WPs consist of a single lead sheet with "agreed to PY audited FS" written next to each line, you haven't done ISA 510 work. You've documented the absence of it.
Related content
- ISA 510 opening balances glossary entry: covers the evidence requirements for opening balances by balance sheet category, including what to do when predecessor access is limited.
- ISA 520 analytical review calculator: run two-year analytics on the PY audited figures and current-period management accounts to inform first-year risk assessment.
- How to test journal entries for fraud under ISA 240 : journal entry testing on a first-year engagement requires building the complete population without PY knowledge of the client's posting patterns.
Related ciferi content
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Frequently asked questions
What does ISA 510 require for opening balances on a first-year audit?
ISA 510.6 requires the auditor to obtain sufficient appropriate audit evidence about whether opening balances contain misstatements that materially affect the current period’s financial statements. For current assets, evidence is typically obtained through current-period procedures (e.g., collection of prior-year receivables). For non-current items, the auditor may need to examine the predecessor’s working papers or perform additional procedures such as tracing fixed asset balances to source documentation. Opening balances include not just prior-year closing numbers but also matters requiring disclosure that existed at the beginning of the period.
What should you ask the predecessor auditor on a first-year engagement?
ISA 510.8 requires the auditor to request management’s authorisation to contact the predecessor. Once authorised, ask about: the reason the audit relationship ended (resignation, non-renewal, dismissal), any disagreements with management on accounting treatments, any material matters communicated to governance under ISA 260 , any fraud or suspected fraud identified during their tenure, and whether they identified scope limitations. Also examine areas where the predecessor obtained evidence through management representations alone, and any qualifications in the predecessor’s report.
How much additional time should be budgeted for a first-year audit engagement?
Budget a first-year engagement at 20% to 30% more hours than a comparable recurring engagement. The additional time covers predecessor communication, opening balance procedures, extended risk assessment under ISA 315.13 (building understanding of the client from scratch), and constructing the permanent file. If the budget does not reflect this additional effort, the audit will be rushed at completion.
What if the predecessor auditor refuses to cooperate or management refuses authorisation?
If the predecessor refuses to cooperate fully, document what access was obtained and what was not, along with the alternative procedures performed to compensate ( ISA 510.10 ). If management refuses authorisation to contact the predecessor, ISA 510.9 treats that as a factor the auditor should consider in deciding whether to accept the engagement. In both cases, the auditor must obtain evidence on opening balances through alternative means such as substantive testing of opening balances directly, which may include verifying historical cost and accumulated depreciation of material asset classes back to source documentation.
How do you handle accounting policy changes on a first-year engagement?
ISA 510.6 (c) requires evaluating whether the accounting policies reflected in the opening balances have been consistently applied in the current period. Compare the accounting policy notes in the prior-year financial statements to the draft current-year policies. If the client changed its depreciation method, revenue recognition policy, or provisioning methodology, evaluate whether the change was properly accounted for under IAS 8 and whether opening balances were restated as required. If the client adopted a new standard in the current period, the transition adjustments are part of opening balance work.
Further reading and source references
- IAASB Handbook 2024: the authoritative source for the complete ISA 510 text, including all application material on opening balances and predecessor auditor communication.
- ISA 510 , Initial Audit Engagements (Opening Balances): the primary standard governing first-year engagement procedures for opening balances.
- ISA 300 , Planning an Audit of Financial Statements: includes ISA 300.13 on additional planning activities required for initial audit engagements.
- ISA 315 (Revised 2019), Identifying and Assessing Risks of Material Misstatement: the risk assessment standard requiring extended understanding of the client on a first-year engagement.
- ISA 550 , Related Parties: related party identification procedures that require building a baseline from scratch on a first-year engagement.
- ISQM 1, Quality Management for Firms: the quality management framework that may impose additional engagement acceptance procedures for new clients.