Audit Adjustments and Your Tax Computation

Nobody in the clearance meeting is thinking about tax. The discussion is about a stock provision, a cut-off error and whether the director’s account movement is income. Then the adjustments get booked, the audited profit changes, and a number nobody in the room owns changes with it.

Audited profit before tax is the first line of the Form C computation. Every adjustment agreed at the end of the audit lands there.

The timing problem

Event	When it happens (31 December year end)
CP204 furnished	30 days before the basis period begins
CP204 revision windows	Sixth, ninth and eleventh months only — June, September, November
Basis period ends	31 December
Audit fieldwork and clearance	February to March
Adjustments known	March
Form C due	31 July, plus one month e-Filing grace

The audit produces its adjustments four months after the last revision window closed. There is no mechanism to revise the estimate retrospectively. Whatever the adjustments do to chargeable income, the estimate is already fixed.

That is the structural link no audit page makes, and it is the reason a company with a well-run audit can still be penalised for a badly-timed one.

How the under-estimation penalty actually works

This is the part that is stated wrongly almost everywhere.

Section 107C(10) of the Income Tax Act 1967 does not charge 10% of the shortfall. Where the tax payable under an assessment exceeds the revised estimate — or the original estimate where none was revised — by more than 30% of the tax payable, the 10% increase is imposed on the amount by which that difference exceeds the 30% margin.

Worked through:

• Final tax payable: RM500,000
• 30% margin: RM150,000
• Estimate furnished: RM300,000
• Difference: RM200,000
• Excess over the margin: RM200,000 − RM150,000 = RM50,000
• Increase at 10%: RM5,000

Ten percent of the shortfall would have been RM20,000. The safe harbour is therefore an estimate of at least 70% of the final tax — anything at or above that attracts nothing at all.

The worse provision is s.107C(10A), which applies where no estimate was furnished and no assessment raised. It charges 10% of the whole tax payable, not 10% of an excess, and for most companies it is far larger than s.107C(10). A company that simply did not file CP204 is in a different and heavier regime from one that filed a poor estimate.

Which adjustments move tax, and which do not

Not every audit adjustment changes chargeable income.

Moves it: cut-off corrections to revenue and purchases, a write-off that is deductible, a reclassification between repairs and capital expenditure (which moves the capital allowance claim), errors in accrued expenses, and corrections to directors remuneration.

Does not move it directly: general provisions that were never deductible, impairment of non-qualifying assets, unrealised exchange differences on capital items, and reclassifications within the balance sheet. These change the accounts without changing the computation — but they change the deferred tax note.

Moves it in a way people miss: a correction to the fixed asset register. Capital allowances are computed off it, so an addition reclassified or a disposal picked up in the audit changes the allowance claim and the balancing charge.

What to do about it

Estimate off a real forecast, not last year plus a margin. The 70% safe harbour is generous if the forecast is honest and useless if the number was picked to manage cash flow.

Use the eleventh month deliberately. By November a December year-end company knows eleven months of results. That is the last chance to correct the estimate, and it is the window most commonly wasted.

Run a draft tax computation during fieldwork, not after. If the computation is prepared alongside the audit, the tax effect of a proposed adjustment is visible at the clearance meeting while there is still a decision to make about whether to book it.

Book last year’s adjustments. Adjustments agreed and never posted reappear as prior-year differences and distort the following year’s estimate as well.

Common mistakes

• Computing the s.107C(10) increase as 10% of the shortfall, which overstates it substantially.
• Confusing s.107C(10) with s.107C(10A). The second is 10% of the whole tax and applies where no estimate was furnished.
• Assuming CP204 can be revised once the audit is done. The windows are the sixth, ninth and eleventh months of the basis period.
• Treating the audit and the tax computation as sequential. They should run in parallel, because the second depends on the first.
• Ignoring the capital allowance effect of fixed asset adjustments.
• Assuming audit exemption removes the tax substance. It removes the audit, not the requirement for a defensible computation.

What’s next

If the adjustments cannot be agreed at all, the disagreement stops being a tax question and becomes a reporting one — which is where the four opinion types come in.