ACCA AFM September 2026: APV — The Discount Rate Error That Keeps Costing Candidates Marks

APV is where AFM marks go to die — and it's nearly always the discount rate

The single biggest APV error in ACCA AFM isn't the base case NPV. It's discounting the financing side effects at the wrong rate. Fix that, and APV becomes one of the most predictable calculation questions on the paper.

AFM's pass rate sat at 45% in December 2025. APV appears regularly in Section A and B, and the examiner's reports keep flagging the same handful of errors — which means they're still costing marks, sitting after sitting.

What the examiner keeps seeing

Error 1: Wrong discount rate on the side effects. The AFM examiner's report noted that candidates discounted the financing cash flows using the all-equity cost of capital instead of a rate that reflects the risk of debt. The tax shield and subsidy benefit are low-risk debt flows — discount them at the risk-free rate or the normal (pre-market) borrowing rate, and state which assumption you've made. Either earns the marks. The ungeared cost of equity does not.

Error 2: Fiddling with the base case rate. The base case NPV is the project as if all-equity financed: ungear the proxy beta, calculate the asset-beta cost of equity, and use it unchanged. The examiner reported candidates making adjustments to the all-equity rate they had just calculated — a fundamental misunderstanding. The whole point of APV is that financing effects are handled separately, not baked into the discount rate.

Error 3: Forgetting issue costs — or calculating them on the wrong number. If the question gives you the net finance needed, the issue costs are charged on the gross amount raised. Candidates routinely apply the percentage to the net figure and lose an easy mark.

Error 4: The theory trap. When asked to compare APV with NPV, quite a few candidates claimed NPV "ignores the benefits of debt financing". It doesn't — WACC captures the tax shield in the cost of debt. APV is preferred when gearing changes significantly during the project or when there are specific financing effects (subsidised loans, issue costs) that a single WACC can't capture.

Worked example: the issue cost gross-up

A project needs $47.5m of funds. Issue costs on equity are 5% of the amount raised.

Wrong: Issue costs = 5% × $47.5m = $2.375m.

Correct: The $47.5m is what must be left after costs. Amount raised = $47.5m ÷ 0.95 = $50m. Issue costs = $50m − $47.5m = $2.5m.

That $0.125m difference is the difference between a mark earned and a mark lost — on a calculation that takes ten seconds when you know the trick.

What to do

1. Learn the three side effects as a fixed checklist. Tax shield on the actual debt raised, subsidy benefit on any cheap loan (interest saved × (1 − tax) where tax relief is lost), and issue costs. Run the checklist every time — the examiner rewards each one separately.

2. Write your discount rate assumption down. One line: "Financing side effects discounted at the risk-free rate as these flows are low risk." You earn the method mark even if a later number slips.

3. Practise the full APV structure to time. Base case NPV (ungeared Ke) + PV of side effects = APV, then a one-line conclusion. In the September sitting you won't have time to derive the approach from scratch — it has to be automatic.

APV questions are among the most formulaic on the AFM paper — the same three side effects, the same rate logic, every time. With a 45% pass rate, the paper is hard enough. Don't donate marks on the predictable bits.