Finance for Marketers / Finance directors
Marketing ROI.
In your P&L.
You already own the budget. The question is not whether marketing can show a return. It is whether that return reconciles to profit.
A finance-first view of the bridge from campaign attribution to incremental revenue, gross profit and operating profit.
Examine the P&L bridge4x ROAS
A revenue-to-media ratio, not a profit measure.
5% campaign ROI
After incrementality, gross margin and full campaign cost.
£6,000 profit uplift
The base case addition to operating profit, not £400k of profit.
01 / The profit bridge
Put the campaign beside the counterfactual.
A fictional quarterly P&L, before interest and tax. The baseline is what the business would have earned without this additional campaign, including existing marketing expense. The campaign column is the estimated incremental change, not a separate statutory line item.
- Attributed sales
- £400,000
- Gross margin
- 45%
- Campaign expense
- £120,000
Net of discounts and returns
After cost of goods sold
£100k media + £20k support
Incrementality assumption
Teaching scenarios, not measured results or recommended targets.
| P&L line | Without campaign | Campaign change | With campaign |
|---|---|---|---|
| Revenue | £2,000,000 | £280,000 | £2,280,000 |
| Cost of goods sold | (£1,100,000) | (£154,000) | (£1,254,000) |
| Gross profit | £900,000 | £126,000 | £1,026,000 |
| Marketing expense | (£200,000) | (£120,000) | (£320,000) |
| Other operating expenses | (£500,000) | £0 | (£500,000) |
| Operating profit | £200,000 | £6,000 | £206,000 |
Incremental operating profit
£6,000
Campaign ROI
5%
Incrementality needed to break even
66.7%
ROI = (incremental gross profit - £120,000 campaign cost) ÷ £120,000. In this simplified case, other operating expenses do not change, so profit after campaign costs equals the operating profit uplift. If fulfilment, support or other overheads rise, include those additional expenses before claiming the same uplift.
02 / Reconcile before approving
The return is only as good as its basis.
Revenue recognition, not pipeline
Use recognised net revenue for the reporting period. Bookings, pipeline and forecast lifetime value may inform the decision, but should not be presented as realised P&L revenue.
Incremental, not simply attributed
Reconcile campaign attribution to total sales, then estimate what would have happened anyway. Holdout and geo tests can support the counterfactual; without evidence, show a sensitivity range rather than a proven ROI.
Full cost, counted once
Map media, agency, production, tooling and relevant staff time to your ledger. Avoid charging costs already in the baseline a second time; do not subtract COGS again after applying gross margin.
Expense timing, not payment timing
Match the return and expense to an agreed period and your accounting policy. This example assumes all campaign costs are expensed in-quarter. Prepayments, accruals and any permitted capitalisation require a separate reconciliation.
Positive ROI is not an approval rule.
At 70% incrementality, the campaign adds £6,000 to operating profit. At 60%, it destroys £12,000. ROAS is still 4x in both scenarios. Your decision depends on the evidence, downside and alternative uses of capital.
Profit is also not cash. Check supplier payment dates, customer collection terms, working capital and liquidity separately. Do not infer cash payback from a quarterly P&L or an ROI percentage.
What the budget paper should contain
- 01A reconciled baseline and incremental revenue case.
- 02Margin, full cost scope and period-matching assumptions.
- 03Downside, base and upside cases with the evidence behind them.
- 04Cash requirements and a separate payback schedule.
- 05A decision owner, review date and explicit stop or scale criteria.
03 / A shared commercial language
You should not have to rebuild every marketing business case.
Finance for Marketers teaches your team how revenue, margin, budgets and campaign returns connect. You bring the financial discipline. They learn to bring the assumptions and commercial reasoning before the budget meeting.
Illustrative educational analysis, not accounting advice. Apply your own policies, evidence and investment criteria.