Substantive work on every material balance
Why ISA 330 requires substantive procedures on every material class, balance and disclosure even when controls work, and how to check coverage.
By Achekam · · 5 min read · For Accountants & audit firms in South Africa, Nigeria, Kenya
A client with strong controls is a pleasure to audit. The sales system will not release an invoice without an approved order, the financial director reviews the bank reconciliation every month, and the walkthroughs go smoothly. It is tempting to conclude that, having tested those controls and found them working, the team can sign off revenue and receivables with little more.
ISA 330 does not allow that. However good the controls, every material figure needs some direct evidence of its own. This article explains the requirement, how controls testing fits around it, and how to check a file for gaps before review.
The requirement in ISA 330
According to ACCA, ISA 330 requires the auditor, irrespective of the assessed risks of material misstatement, to design and perform substantive procedures for each material class of transactions, account balance and disclosure. "Irrespective" carries the weight: a low assessed risk changes how much substantive work is needed and of what kind, but it does not remove the work.
Why a floor at all? Two reasons sit behind it in practice. Risk assessment is a judgement, and a risk assessed as low may not be. And controls, however well designed, have limits: they can be overridden, they can fail on the day that matters, and a test of controls tells you about the process rather than directly about the figure. A minimum of direct evidence on every material area protects the opinion against both.
The requirement sits inside ISA 330's broader principle. As quoted by ACCA, the standard requires further audit procedures whose nature, timing and extent are based on and responsive to the assessed risks at the assertion level. ACCA's article on ISA 330 and the auditor's responses to assessed risks walks through both requirements and is a useful refresher before planning.
Tests of details and substantive analytical procedures
ACCA explains that ISA 330 defines a substantive procedure as one designed to detect material misstatements at the assertion level, made up of tests of details and substantive analytical procedures.
- Tests of details examine individual items: vouching additions to invoices, confirming balances with customers, inspecting title deeds, recalculating an accrual.
- Substantive analytical procedures build an independent expectation of a figure and compare it with what was recorded: rent predicted from lease agreements, payroll cost predicted from headcount and pay rates, interest predicted from loan balances and rates. An analytical procedure only counts as substantive if the expectation is precise enough to reveal a material misstatement and the differences are investigated.
For a low-risk balance at a well-controlled client, a carefully built analytical procedure can be the entire substantive response. For higher risks, tests of details usually join it. Either way, something substantive has to be on the paper.
Where tests of controls fit
ACCA explains that ISA 330 defines a test of control as a procedure designed to evaluate the operating effectiveness of controls in preventing, or detecting and correcting, material misstatements at the assertion level. The two kinds of work do different jobs:
| Test of control | Substantive procedure | |
|---|---|---|
| The question it answers | Did the control operate effectively through the period? | Is the figure materially misstated? |
| Evidence about | The process | The balance or the transactions |
| A good result means | Less substantive work may be needed | Direct support for the assertion |
| Enough alone for a material balance? | No | Yes, where sufficient |
Controls testing earns its place by reducing the extent of substantive work or changing its nature and timing. It never replaces it. Walkthroughs and controls covers how to evaluate and test controls before relying on them.
Where material areas slip through
On real files the gap tends to appear in the same places:
- Balances judged low risk at planning and never revisited, such as prepayments, sundry payables, deposits and intercompany accounts.
- Disclosures. The requirement covers material disclosures, not only balances: related-party notes, commitments, contingencies.
- Transactions behind a tested balance. Revenue covered only by controls because receivables were confirmed.
- Areas supported only by inquiry. "Discussed with the financial director, no issues noted" is not a substantive procedure.
- Accounts that grew during the year, immaterial at planning but material at year end.
Lead schedules and generated papers as a coverage map in Achekam
In Achekam, lead schedules are built from the engagement's trial balance, with each figure traceable to its lines. That makes them a natural coverage map: every material line should have at least one substantive procedure behind it. Where a figure needs correcting, staff can record an audit adjustment on the line with a reason, and findings can be raised from a working paper and closed or withdrawn.
Working papers can be generated from the methodology. Achekam reads the engagement's facts, a person confirms what it cannot read, another person approves the profile, and a dry run shows which papers will be created before any are. The dry run is the moment to ask the coverage question early: will the papers about to be created reach every material line, disclosures included? If an area has no paper, add one before fieldwork rather than at completion.
At the level of a single step, each work item lists the procedures to perform and the documents required. A step is marked done only with a written response and its documents, or set aside with a reason, and steps are never deleted. A step set aside on a material balance deserves a reviewer's question: what took its place?
A coverage check before manager review
Before a file goes to the manager, the senior can work through this list:
- Compare the final trial balance with overall materiality and list every line and disclosure above it.
- For each, name the substantive procedure, test of details or analytical, and the paper it sits on.
- For every analytical procedure relied on as substantive, confirm the expectation and the investigation threshold are recorded.
- For every area where controls were tested, confirm what substantive work was done as well.
- List material disclosures separately and confirm the evidence behind each.
- Record any area left without a substantive procedure, then fill the gap or explain why it is not material.
How individual risks lead to particular procedures is covered in linking risks to procedures. The principle to carry into every file is short: good controls earn a lighter touch on a material balance, never no touch at all.
General guidance only, not advice on your own circumstances. Tax and payroll rules change: check the current position with the authority or your adviser.
