Materiality Explained: Why Auditors Don’t Check Every Transaction

19th Jan

kohlimaudit

Materiality Explained: Why Auditors Don’t Check Every Transaction

One of the most common questions SME owners ask during an audit is:

“Why didn’t the auditor check everything?”

At first glance, this sounds reasonable. If an audit is meant to verify the financial statements, shouldn’t every invoice, receipt, and bank transaction be reviewed?

The short answer is no—and the reason is materiality.

This article explains materiality in plain English, why auditors rely on it, how it works in practice in Singapore audits, and what SME directors should understand to avoid unnecessary tension and misunderstandings during the audit process.

What Is Materiality? (Plain-English Definition)

In simple terms, materiality asks one key question:

Would this matter to someone using the financial statements to make decisions?

If the answer is yes, it is material.
If the answer is no, it is not material.

Materiality recognises that:

Financial statements are summaries, not transaction listings
Users care about the big picture, not immaterial details
Absolute precision is neither practical nor necessary

Why Auditors Cannot (and Should Not) Check Everything

Imagine an SME with:

10,000 sales invoices
6,000 expense claims
12 bank accounts
Hundreds of journal entries

Checking every transaction would mean:

Audits would take months
Audit fees would be unaffordable
Financial reporting would become impractical

More importantly, it would not improve audit quality.

Auditors aim to provide reasonable assurance, not absolute certainty. Materiality is what makes this possible.

The Purpose of an Audit (Often Misunderstood)

An audit does not mean:

“Every transaction is correct”
“There are no errors at all”
“Nothing can ever go wrong”

An audit means:

“There is no material misstatement in the financial statements.”

This wording is deliberate and consistent with international auditing standards applied in Singapore.

Materiality in the Singapore Context

Audits in Singapore follow International Standards on Auditing (ISAs), which are adopted and enforced by regulators such as Accounting and Corporate Regulatory Authority.

These standards require auditors to:

Set materiality at the planning stage
Focus audit work on higher-risk and higher-impact areas
Use professional judgment rather than mechanical checking

Materiality is therefore not optional—it is a core audit principle.

How Auditors Set Materiality (Conceptually)

Auditors do not pick materiality randomly. They typically consider:

Profit before tax
Revenue
Total assets
Equity
Nature of the business

For example:

A $5,000 error may be material for a small dormant company
The same $5,000 is immaterial for a $20 million turnover SME

Materiality is relative, not absolute.

Performance Materiality: Why Even Material Items May Not Be Fully Tested

In addition to overall materiality, auditors also apply performance materiality.

This is a lower threshold used to:

Reduce the risk that many small errors add up to a material one
Determine sample sizes
Decide how much testing is enough

This explains why:

Not every large balance is fully tested
Sampling is used even for material areas

Why Auditors Use Sampling Instead of Full Testing

Sampling Reflects How Businesses Actually Operate

Auditors assume:

Errors tend to follow patterns
Systemic issues show up in samples
One-off immaterial errors are unavoidable in real businesses

Sampling allows auditors to:

Identify trends
Assess controls
Focus on risk areas

Checking everything would dilute focus, not improve insight.

Common SME Frustrations (And the Real Reasons Behind Them)

“They Didn’t Check This Invoice — Isn’t That Risky?”

If an invoice:

Is small
Is routine
Does not indicate control weaknesses

Then it is unlikely to affect users’ decisions and is therefore immaterial.

“They Focused on This One Adjustment Too Much”

Auditors often spend more time on:

Estimates
Provisions
Related party transactions
Unusual or non-recurring items

This is because:

Judgment is involved
These items can materially affect profit or balance sheet
Risk is higher than routine transactions

“They Ignored Small Errors”

Small errors may be:

Not material individually
Not material in aggregate
Corrected through management representation instead of adjustments

This is normal audit practice.

Materiality Is Not a Free Pass for Errors

A critical misunderstanding is thinking:

“If it’s immaterial, it doesn’t matter.”

This is not true.

Auditors still consider:

Nature of the error
Whether it indicates control weaknesses
Whether it is intentional

For example:

Fraud is material by nature, even if small in value
Related party misstatements matter even if amounts are small
Regulatory non-compliance can be material regardless of dollars

Materiality is about impact, not excuses.

Qualitative Materiality: When Small Amounts Still Matter

Some items are material even if the numbers are small, such as:

Director remuneration disclosures
Related party transactions
Breaches of laws or loan covenants
Grant compliance items
Misclassification that changes profit to loss

Auditors look beyond numbers to context.

How Materiality Affects Audit Adjustments

During audits, you may hear:

“This adjustment is immaterial”
“We will pass this adjustment”
“We will list this as an unadjusted difference”

This does not mean the auditor missed it.

It means:

The auditor identified the issue
Assessed its impact
Concluded it does not affect the overall true and fair view

These items are usually documented internally.

Why Auditors Sometimes Insist on “Small” Adjustments

SMEs are often surprised when auditors insist on adjusting:

$8,000
$12,000
$15,000

Even though larger errors exist elsewhere.

Reasons include:

The adjustment affects a sensitive area (e.g. directors’ accounts)
It changes compliance outcomes
It relates to a high-risk judgment area
It has qualitative significance

Materiality is not just about size.

What Directors Should Understand About Their Role

Directors sometimes assume:

“If auditors accept it, we’re safe.”

In reality:

Directors remain responsible for the accounts
Auditors express an opinion, not ownership
Passing immaterial errors does not shift responsibility

This distinction is important, especially if issues surface later.

How SMEs Can Work Better With Materiality (Instead of Fighting It)

1. Focus on Big, Risky, Judgmental Areas

Spend more time on:

Provisions
Accruals
Revenue recognition
Related party balances

These areas attract audit attention for good reason.

2. Don’t Over-Explain Trivial Items

Flooding auditors with explanations for immaterial items:

Slows down the audit
Distracts from real risks
Increases friction

Let materiality guide effort.

3. Ask the Right Question

Instead of asking:

“Why didn’t you check everything?”

Ask:

“What areas matter most from an audit risk perspective?”

This leads to better discussions and smoother audits.

Why Materiality Ultimately Protects SMEs

Materiality:

Keeps audit fees reasonable
Prevents unnecessary disruption
Focuses attention where it actually matters
Allows timely completion of audits

Without materiality, audits would be:

Prohibitively expensive
Operationally impossible
Of little practical value

Final Thoughts

Auditors don’t check every transaction because they don’t need to—and because doing so would not make financial statements more useful.

Materiality ensures that audits focus on:

What influences decisions
What carries risk
What affects the true and fair view

For Singapore SMEs, understanding materiality helps:

Set realistic expectations
Reduce audit frustration
Improve cooperation with auditors
Achieve faster, cleaner audits

Materiality is not about lowering standards—it is about applying professional judgment to deliver meaningful assurance.

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