From the interim audit to year end: closing the gap
What further procedures ISA 330 requires between an interim audit date and the year end, what to roll forward, what to retest, and a checklist.
By Achekam · · 5 min read · For Accountants & audit firms in South Africa, Nigeria, Kenya
The interim visit went well. In October the team tested payroll controls, confirmed receivables at the end of September and vouched additions to plant up to the interim date. Now it is February, the year ended in December, and the manager wants to know how much of the October work still stands. The honest answer is: some of it, provided the gap is closed properly.
Interim audits help firms spread the load away from the busiest months and give clients earlier warning of problems. The price is a gap: the months between the interim date and the period end, which the interim work never saw. This article covers what the standards require for that gap and how to close it without redoing everything.
Why interim work leaves a gap
Evidence obtained at an interim date speaks to the position at that date, or to how controls operated up to it. Transactions in the remaining months, balances at the period end, and any change in how controls worked after the visit are outside its reach. A receivables confirmation at the end of September says nothing about invoices raised in November or write-offs agreed in December.
ACCA explains that, under ISA 300, audit planning is not a discrete and separate part of the audit and often begins shortly after, or in connection with, the completion of the previous audit. Interim fieldwork belongs inside that continuous process, and so does the plan for the remaining period. It should be decided when the interim work is done, not improvised after year end.
What ISA 330 requires for the remaining period
ACCA explains that under ISA 330, if substantive testing is performed at an interim date, further substantive procedures, alone or combined with tests of controls, are required for the period between the interim date and the period end. ACCA's article on ISA 330 and responses to assessed risks sets out that requirement alongside the rest of the standard's choices on timing.
That leaves two routes:
- Further substantive procedures alone. Compare the year-end balance with the interim balance, investigate unusual movements, and test transactions in the remaining months where the risk or the size of the movement calls for it.
- Substantive procedures combined with tests of controls. ACCA explains that ISA 330 defines a test of control as a procedure that evaluates how effectively controls prevent, or detect and correct, material misstatement. If the team relies on a control for the whole year, it needs evidence about how that control operated after the interim visit as well, by extending the test or by establishing that nothing changed.
Risk sets how far a simple comparison can carry the roll-forward. ACCA notes that ISA 330 indicates that, in general, the extent of audit procedures increases as the risk of material misstatement increases. A significant risk in revenue will rarely be answered by rolling forward an interim confirmation with a movement analysis alone.
Deciding what to roll forward and what to retest
Some interim work carries forward well:
- Balances with predictable movements, such as property and equipment, long-term loans and share capital, where additions, disposals and repayments in the remaining months can be tested directly.
- Receivables confirmed at interim, where the client's cut-off and collections are reliable and later receipts can be traced.
- Controls tested at interim, where inquiry and observation show no change in people, systems or process.
Other areas usually need fresh work at year end:
- Inventory and cut-off: the year-end count and dispatches either side of the period end.
- Estimates such as provisions, impairments and accruals, which depend on year-end information.
- Bank and cash.
- Anything that changed: a new system, a new financial controller, an acquisition, a major customer lost.
- Going concern and subsequent events, which are year-end matters by nature.
Record the decision for each area in the plan, with the reason. A reviewer will want to know why the interim confirmation was enough for one balance and not for another.
Refreshing workbooks from the year-end trial balance in Achekam
In Achekam, a working paper can carry a spreadsheet workbook whose figures are refreshed from the engagement's trial balance, with any figure the refresh could not read listed. Once the engagement holds the year-end trial balance, refreshing pulls those figures into the workbook, so the roll-forward starts from the right numbers instead of retyped ones.
Two practical points. Refreshing is refused on a locked file or on a paper under review, so finish or clear the review of an interim paper first. And before refreshing, make sure the interim figures the work relied on are written into the paper's conclusion, so the evidence of what was tested at interim is not lost when the numbers move. Afterwards, check the list of unread figures for accounts renamed or opened since the interim visit.
Comparing interim and year-end lead schedules
Lead schedules in Achekam are built from the engagement's trial balance, with each figure traceable to its lines. Setting the interim position beside the year-end lead schedules, line by line, is the backbone of the roll-forward: every large or unexpected movement becomes an item to explain and corroborate. Where the comparison turns up an error, staff record an audit adjustment on the line with a reason.
The Working Paper Control Centre can group the engagement's papers by statement line, which helps confirm that every line with a material movement has a paper covering the remaining period. For building expectations precise enough to rely on, see substantive analytical procedures.
A roll-forward checklist
- Interim figures and conclusions recorded on each paper before any refresh.
- Year-end trial balance in place, workbooks refreshed and unread figures resolved.
- Interim and year-end balances compared for every material line, with movements explained and corroborated.
- Transactions in the remaining months tested where risk or movement requires it.
- For every control relied on, evidence that it operated through year end, or the changes identified.
- Year-end-only areas done fresh: count, cut-off, estimates, bank, going concern, subsequent events.
- Changes in the business since interim identified, and their effect on the plan recorded.
- The plan updated with the reasoning for each area rolled forward, as described in audit strategy and plan.
An interim visit saves time only if the gap after it is closed on purpose. Decide at interim what the year-end visit must cover, write it down, and the February conversation becomes a checklist rather than a debate.
General guidance only, not advice on your own circumstances. Tax and payroll rules change: check the current position with the authority or your adviser.
