How to Pass ACCA PM Section C: The Variance Mistake Costing You Marks (2026)
The bottom line
You don't lose PM in the calculations — you lose it in the discussion. Section C variance questions hand out roughly half their marks for interpretation, and that's exactly where candidates throw them away with vague, generic comments. Fix three things and Section C stops being a coin toss.
What the examiner keeps flagging
PM's pass rate hit 45% in March 2026 — its highest in over a decade — after sinking to 40% in December 2025. The swing isn't about harder sums. It's about technique in the two 20-mark Section C questions, where decision-making, budgeting and variance analysis live.
The single most-repeated variance error: using standard profit instead of standard contribution. Where a marginal costing system applies, the sales volume variance is valued at standard contribution per unit. Reach for profit and the whole figure is wrong before you've written a word of analysis.
The second killer is unlabelled variances. Every number must be marked Favourable or Adverse. A figure left as positive or negative, with no F/A label, risks scoring nothing — even when the maths is right.
The third, and most expensive, is generic narrative. The examiner is blunt: marks go to comments tied to the scenario, not to textbook statements. "The variance is adverse" earns zero. A comment that names the cause from the scenario earns the mark.
Wrong answer vs right answer
Take a $16,000 adverse sales volume variance. Here's what loses marks:
Generic (0 marks): "There is an adverse sales volume variance. This means the company sold fewer units than budgeted, which is bad for profit."
Applied (full marks): "The $16,000 adverse sales volume variance reflects the loss of the Westside contract described in note 3, which cut unit sales by 800. As this was a one-off customer exit rather than a fall in underlying demand, it is unlikely to recur, so the variance overstates the longer-term performance problem."
Same variance. The second answer reads the scenario, explains the cause, and judges what it means. That's the difference between a mark and a blank.
What to do
1. Value sales volume on contribution. Under marginal costing, sales volume variance = (actual units − budget units) × standard contribution per unit. Never standard profit.
2. Label everything F or A. Write the letter next to every variance as you go. It takes a second and protects marks the examiner will otherwise withhold.
3. Make every sentence point at the scenario. If your comment would fit any company, it scores nothing. Name the contract, the price change, the supplier — whatever the question gave you.
The takeaway
Around half of a variance question's marks are for words, not numbers — and they're the marks most candidates leave on the table. With the September 2026 exams running 7–11 September, you have time to drill the discussion, not just the calculation. Get the contribution right, label every variance, and write like you've read the scenario. That's how 40% becomes a pass.