ACCA FM December 2026: The Profit-to-Cash-Flow Mistake That Wrecks Your NPV

If the FM question gives you profit, your first job is to turn it back into cash. Add back depreciation, add back amortised sunk costs, and treat a loss as a tax refund, not a dead year.

Miss those three adjustments and the whole NPV is built on the wrong numbers before you've discounted a single cell.

What the examiner saw

The March/June 2025 FM Section C question (Sulu Co) gave forecast profit or loss before tax for four years and asked for the NPV. That's a deliberate trap. NPV is a discounted cash flow technique, so the profit figures had to be converted first.

The examiner's report says too many candidates made neither adjustment, made only one, or got the direction wrong and deducted the costs instead of adding them back. This is a 6-mark requirement and it opens every FM exam's investment appraisal question. The examiner's own recommendation is blunt: every recent FM exam contains a Section D investment appraisal question, so work through as many as you can.

The three adjustments

Depreciation is not a cash flow. Sulu's machinery cost $600,000, depreciated straight-line over four years, so $150,000 a year had been charged against profit. Add it back. The cash left when the machine was bought at T0, not year by year.

Sunk costs are not relevant cash flows. $200,000 of R&D had already been spent and was being amortised at $50,000 a year. That money is gone whether or not the project goes ahead, so the amortisation comes back too.

A loss gets tax relief, not silence. Sulu Co was stated to be profitable overall. If your operating cash flow in a year is negative, the company pays less tax elsewhere, so the tax line is an inflow. Candidates who showed it as an outflow, or left it blank on the assumption that a loss means no tax effect, lost marks on figures they had otherwise calculated correctly.

Wrong answer vs correct answer

Wrong (what the examiner kept seeing): Year 1 forecast loss ($75,000). Candidate takes the loss as the cash flow, deducts nothing for tax because "it's a loss", and then calculates tax-allowable depreciation on a 25% reducing balance basis because that's what they practised. Year 1 net cash flow: roughly ($37,500). The project looks like it's bleeding.

Correct: Loss ($75,000) + depreciation $150,000 + R&D amortisation $50,000 = operating cash flow $125,000. Tax at 20% = ($25,000), paid in the same year because the question said so. The question also said the machinery qualifies for a 100% first-year allowance, so the tax saving is the full $600,000 × 20% = $120,000 in year 1, not a reducing-balance drip. Year 1 net cash flow: $125,000 − $25,000 + $120,000 = $220,000.

Same data. One answer is negative, the other is positive by more than a fifth of the investment. The difference is entirely exam technique, not finance knowledge.

What to do

1. Read the tax paragraph twice before touching the spreadsheet. Timing (same year or one year in arrears), allowance type (100% first-year, 25% reducing balance, straight-line) and whether the company is profitable all change the numbers. Sulu Co candidates who defaulted to a reducing-balance TAD calculation were answering a question that wasn't set.

2. Build the tax line as a formula, with a minus sign. The examiner shows exactly this: tax = −operating cash flow × 0.20, copied across years 1 to 4. A negative operating cash flow then automatically flips to a positive tax inflow, so you can't get the direction wrong.

3. Use NPV() for T1 onwards, then subtract T0 separately. The spreadsheet NPV function assumes the first cash flow is at T1. Compute the PV of years 1 to 4 with it, then net off the initial outlay. And write one sentence of comment on the result; the examiner noted candidates throwing away a "potentially straightforward" mark by not doing so.

The numbers

FM passed 48% of candidates in June 2026, in line with its long-run range of 46–50%. Investment appraisal is the one Section C question you can bank on seeing, and the profit-to-cash-flow conversion is the first thing it tests.

Profit is an opinion. Cash is a fact. The NPV only works with facts.