Agency Pricing Guide
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An objective breakdown of the four main agency pricing models, their incentive structures, and which actually aligns with your commercial goals.
What is the best pricing model for a Google Ads agency?
Fixed monthly retainers align agency incentives with client profit rather than spend inflation. The agency has no financial incentive to increase your budget unnecessarily and is rewarded for efficiency and strategic thinking.
Percentage-of-spend models (10-20% of ad spend) create structural conflicts: the agency earns more when you spend more, regardless of whether that spend is profitable.
The Four Models
How each pricing model works
Each model creates different incentive structures. Some align with your goals. Most don't.
Percentage of Ad Spend
Agency charges 10-20% of your monthly Google Ads spend as their management fee.
Pros
- Fee scales with your investment
- Agency has skin in the game (sort of)
- Easy to calculate
Cons
- Agency earns more when you spend more, not when you profit more
- Creates incentive to inflate budgets unnecessarily
- Fee compounds as you scale-£100k spend = £10-20k fee
- No accountability for commercial outcomes
Best For
Brands who prioritise simplicity over aligned incentives
Verdict
Structurally misaligned. The agency benefits from spend inflation, not profit growth.
Performance/Commission Based
Agency takes a percentage of revenue or leads generated through ads.
Pros
- Appears to align incentives with results
- Low upfront cost
- Agency motivated to drive volume
Cons
- Attribution is murky-what counts as 'from ads'?
- Encourages short-term thinking over brand building
- Can lead to aggressive tactics that hurt long-term
- Revenue ≠ profit-agency may drive unprofitable sales
Best For
Simple, single-product businesses with clear attribution
Verdict
Sounds good in theory. Falls apart in practice for complex ecommerce.
Hourly/Day Rate
Agency bills for time spent working on your account, typically £50-200/hour.
Pros
- Transparent-you pay for work done
- Flexible for project-based work
- Good for consultancy or audits
Cons
- Inefficiency is rewarded-more hours = more money
- Unpredictable monthly costs
- No incentive for strategic thinking that saves time
- Difficult to budget for ongoing management
Best For
One-off projects, audits, or consultancy-not ongoing management
Verdict
Fine for projects. Terrible for ongoing partnerships.
Fixed Monthly Retainer
One predictable fee regardless of ad spend or hours worked.
Pros
- Predictable costs for budgeting
- Agency incentivised by efficiency, not spend inflation
- Aligned with your commercial goals, not their billing
- No conflict when recommending budget cuts
Cons
- May feel expensive if account is small
- Requires trust that agency delivers value
- Less flexibility for seasonal businesses
Best For
Brands who want a commercially aligned partner, not a vendor
Verdict
Aligned incentives. Agency succeeds when you succeed, not when you spend more.
Side-by-Side
How the incentives compare
| Factor | % of Spend | Performance | Hourly | Fixed Fee |
|---|---|---|---|---|
| Incentive alignment | Spend more | Revenue (not profit) | Work longer | Your profit |
| Budget advice | Increase budget | Increase budget | Neutral | Right-size budget |
| Cost predictability | Variable | Variable | Variable | Predictable |
| Transparency | Medium | Low | High | High |
| Long-term thinking | Low | Low | Low | High |
| Scalability | Fee grows with spend | Fee grows with revenue | Fee grows with hours | Fee stays stable |
Common Questions
Frequently asked questions
Should I pay a PPC agency a percentage of ad spend?
Percentage-of-spend pricing creates a structural conflict: the agency earns more when you spend more, regardless of whether that spend is profitable. This incentivises budget inflation over profit optimisation. Consider fixed-fee models that align agency incentives with your commercial goals.
How much should a Google Ads agency charge?
Quality ecommerce Google Ads management typically ranges from £2,000-£20,000+ per month depending on account complexity, catalogue size, and strategic requirements. Percentage-of-spend agencies typically charge 10-20% of ad spend, which can become very expensive as you scale.
What is the difference between ROAS and POAS agencies?
ROAS (Return on Ad Spend) agencies optimise for revenue per pound spent. POAS (Profit on Ad Spend) agencies optimise for contribution margin per pound spent. The difference matters because high-revenue products are often low-profit products-a 4x ROAS can still lose money after COGS, returns, and shipping.
Ready for aligned incentives?
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