The Working Capital Cost of Performance Max
Performance Max optimises for conversions. It doesn't know or care about your cash position. Here's why that disconnect creates hidden capital requirements.
Performance Max is efficient at finding conversions. It's completely indifferent to whether those conversions help or hurt your cash flow. And because it controls so much of your spend, that indifference becomes expensive.
Every PMax optimisation decision that favours higher-value orders also favours slower cash recovery, more returns risk, and deeper inventory commitment.
How PMax Creates Capital Pressure
It Chases High-AOV Orders
PMax learns that higher-value orders improve ROAS. So it optimises toward them. Higher-AOV orders are more likely to use BNPL, more likely to include complex multi-item shipments, and more likely to generate returns.
It Ignores Payment Method Mix
A £200 order paid via card settles in 3 days. A £200 order via Klarna might take 60 days. PMax treats them identically. Your cash flow doesn't.
It Scales Before You're Ready
When PMax finds a winning audience, it scales into it aggressively. That's good for conversions. It's potentially disastrous if your cash position can't support the suddenly increased inventory and ad spend.
The Hidden Capital Requirements
When PMax scales efficiently, it creates these capital needs:
A PMax Scaling Scenario
That £60,000 isn't optional. You need it before the revenue arrives. PMax doesn't ask if you have it. It just scales.
The Inventory Commitment Problem
PMax doesn't know your stock levels. It optimises based on historical performance data. If a product performed well last month, PMax will push it hard this month, whether you have stock or not.
- Stock-outs waste ad spend on products you can't fulfil
- Over-ordering ties up cash in slow-moving inventory
- Successful PMax campaigns can drain inventory faster than you can replenish
- International expansion via PMax requires holding stock for longer shipping windows
Managing PMax with Capital Constraints
1. Set Budget Caps by Cash Position
Don't set PMax budgets by ROAS targets alone. Calculate how much ad spend your current working capital can support through the cash recovery cycle.
2. Use Feed-Level Controls
Exclude low-stock products from PMax before they run out. Use custom labels to group products by inventory depth and set separate asset groups.
3. Monitor Cash Cycle by Campaign
Track which PMax asset groups have longer cash recovery periods. If a group attracts more BNPL or international orders, factor that into spend allocation.
4. Implement Scaling Governors
Set weekly budget increase limits. Even if PMax wants to scale faster, constrain it to match your capital runway.
The CFO Conversation
If you're running PMax without involving finance, you're making capital allocation decisions without the people responsible for capital. Every PMax optimisation affects:
What PMax Controls
- • Which products get promoted
- • Which audiences see ads
- • When spend accelerates
- • Where budget gets allocated
What Finance Needs to Know
- • Cash requirements for scaling
- • Inventory investment timing
- • Payment method impact on receivables
- • Working capital runway
PMax is a powerful optimisation tool. It's not a capital planning tool. The gap between those two things is where brands get caught.
Related Reading
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