As you’re studying for your CPA Canada exams, especially for the Assurance elective and the Common Final Exam (CFE) – Assurance role, you’ll come across the concept of rollback audit procedures.
While the term might sound technical at first, rollback is a straightforward and effective audit technique. It’s used when prior year data is incomplete, unaudited, or needs to be verified indirectly. Think of it like time travel for auditors: you’re working backwards from the year-end to verify the beginning-of-year balance.
In this article, I’ll explain rollback procedures in more detail and give tips on how to detect it during the CPA exam.
What are audit rollback procedures?
Rollback procedures involve starting with an account’s year-end balance and then adjusting for year’s transactions to verify the opening balance. Put simply, it means working backwards through the year to check if the beginning balance makes sense based on what happened during the year.
Why would auditors use it? Well, rollback is used when the opening balance can’t be trusted on its own. For example, let’s say last year’s audit wasn’t done, or the client is new and their prior F/S weren’t audited. Instead of assuming the opening balance are correct, auditors use rollback to rebuild opening balances from what they can verify: ending balance and transactions during the year.
For example, let’s say a company has $200,000 in inventory at year-end. During the year, they purchased $500,000 of inventory and sold $450,000 worth. The auditors want to verify the prior year balance (ie, opening balance).
You may recall the following formula from your MA studies: “Ending Balance = Opening Balance + Purchases – Sales”. This formula can be re-arranged to be like this: “Ending Balance – Purchases + Sales = Opening Balance”
We can use this formula and perform a rollback to check the opening balance:
- Year-end (Ending Balance): $200,000
- Less: Purchases: $500,000
- Add: Sales: $450,000
- Equals (Opening Balance): $150,000
So opening inventory balance is $150,000. If the company’s records also say they started the year with $150,000 in inventory, that supports the the balance. If it doesn’t match, that’s a red flag and auditors would investigate further
Overall, auditors use rollback procedures when:
- They didn’t audit the prior year’s financials
- The client has incomplete records or prior year detail is missing
- They need to verify opening balances (first-year audit or auditor switch)
- They want to test cut-off around the year-end
- They need to recalculate balances from partial data
Rollback procedures are commonly used in areas such as:
- Inventory
- PPE
- Accounts Receivable
How do you recognize it during CPA exam?
Rollback procedures are needed when direct evidence for an opening balance isn’t available. It is your go-to audit procedure when:
- The client switched auditors and you didn’t audit the prior year
- You’re testing opening balances
- You want to verify cut-off accuracy
- The client’s records are incomplete or unreliable
To get full marks on your CPA exam case, be clear and specific. Write a procedure like below:
“Perform rollback procedures by adjusting the current year’s ending balance for relevant transactions (e.g., purchases, sales, depreciation) to verify the accuracy of the opening balance.”
This shows markers that you understand both the purpose and the mechanics of the procedure.
Exam scenarios
Below are some common exam scenarios where speaking about rollback procedure makes sense.
Scenario: First-Year audit engagements
Context: Auditor is performing an audit for first time of client, thus they have no direct audit evidence from prior year’s financials. Auditor is still responsible for obtaining sufficient and appropriate audit evidence to ensure the opening balances don’t contain material misstatements
Approach: Prior year working papers are unavailable or not fully reliable, because the previous audit firm did not share sufficient documentation. This means we must perform rollback procedures.
Procedure: Perform rollback procedure by recalculating the opening balance using the audited year-end balance and current year transaction details (such a JEs, GL, trial balance) to ensure the opening balances are not materially misstated in the absence of prior audited figures.
Scenario: Change in auditors
Context: A client changes audit firms, so the new auditor inherits balances that they didn’t originally verify. The risk increases if the prior auditor’s workpapers aren’t accessible or if there are concerns about prior audit quality.
Approach: Rollback procedure is necessary as the opening balances are inherited. It’s used to gather objective evidence rather than relying on unconfirmed prior year data.
Procedure: Perform rollback procedure by tracing transactions from the opening balance to the audited year-end balance using current year supporting documents, specifically invoices, JEs, bank statements, to ensure the opening balances are independently verified without relying on prior audit work.
Scenario: Cutoff testing or prior period errors
Context: Inventory purchase was recorded in early January but it might actually relate to December
Approach: If this cutoff is incorrect, it affects both inventory valuation and COGS, which impacts gross profit. You can recommend a rollback procedure here, because it allows auditors to determine whether the opening balances reflect appropriate cutoffs.
Procedure: Perform rollback on inventory balances using the year-end inventory figure and purchase activity near year-end to ensure transactions are recorded in the correct period and opening inventory reflects accurate cutoff.
Conclusion
Rollback audit procedures are used when dealing with opening balances, cut-off errors, or incomplete prior-year data.
They’re common and can appear in CPA exams. Consider rollback when you see the following next time:
- Prior year not audited
- Opening balance questionable
- Transactions well-documented but the start of year is messy…
Extra resources
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