Pricing of Google Ads agencies: which billing model pays off for you

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When it comes to Google Ads agency pricing, there is uncertainty on both sides. Clients fear paying for “a few clicks.” Agencies find it hard to convey the value of clean tracking and ongoing conversion optimization, because this work happens behind the scenes.

The price rarely follows pure time spent, but the complexity and risk of an account. An account with a €100,000 monthly budget needs completely different monitoring and safeguards than a local trades business with €500. In this article, we show the five common billing models, what actually determines an agency's price and why we bill with a retainer and projects.

Every billing model creates different incentives

There is no single right model. Each structure has advantages and disadvantages, depending on account size and objectives. What matters is which behavior the model rewards at the agency.

Percentage of the ad budget

For a long time, this was the standard for medium and large budgets. The agency charges a percentage of the amount you pay to Google.

Advantage: Costs grow with the account. When the budget rises, complexity usually rises too: more campaigns, more data, more need for optimization. The fee covers this additional effort.

Disadvantage: The model rewards higher spending, not higher profit. An agency earns more when the budget rises, even if efficiency does not grow with it. In addition, the effort does not double when the budget doubles.

Fixed monthly fee (retainer)

You pay a fixed amount per month, regardless of budget.

Advantage: Both sides have planning certainty, and there is no incentive to artificially increase the budget.

Disadvantage: With strong growth or seasonal peaks, the agency hits capacity limits because the additional effort is not paid for. Conversely, if the budget is cut, you keep paying the same amount.

Performance-based compensation

Here the agency is paid by results, for example per lead or as a share of revenue generated. That sounds logical, but we consider it the wrong choice.

Google Ads is an iterative process in an auction market in which competitors, seasonality and technical factors such as Consent Mode influence the result every day. Purely performance-based compensation therefore often leads the agency to stop taking risks out of concern for its fee.

Then exactly the tests that would be needed for the next growth step don't happen. This protects the commission in the short term and costs you growth in the long term. Profit comes from work on data quality, landing pages and tracking: work that doesn't show up immediately in a conversion statistic but is the foundation for every result.

Base fee plus performance bonus

The fixed fee is meant to cover costs, the bonus to motivate top performance. In practice, a dynamic similar to the pure performance model emerges: the agency manages the status quo that secures the bonus.

You, in turn, wonder with every invoice how much of the increase is actually due to the agency. This rarely creates the mutual trust that is decisive for long-term results.

Retainer plus project-based billing

We consider this model the most balanced. The monthly fee does not have to be set artificially high to cushion possible extra work.

The retainer for ongoing work covers everything that belongs to the continuous optimization of your campaigns:

• daily monitoring of bid strategies,
• maintaining search terms and excluding irrelevant search queries,
• A/B tests of existing ads,
• standard reporting.

Projects for larger steps are billed separately, by the hour or by quote. These include:

• internationalization: building campaigns in new languages and markets,
• technical expansion: server-side tracking or connecting your CRM via API,
• designing landing pages that turn clicks into inquiries.

Three factors determine an agency's price

Two quotes for the same account can be far apart. The difference is almost always explained by three factors: the scope of consulting, technical complexity and the number of campaigns.

Consulting and analysis are the biggest cost factor

An automated PDF report at the end of the month costs an agency practically nothing. An experienced point of contact who discusses strategy with you every two weeks, prepares competitive and profitability analyses and feeds feedback from your sales team into the campaigns, on the other hand, is a significant cost factor.

If you want to use a small budget solidly, the need for strategic consulting is low. If you want to grow your company systematically with Google Ads, it takes more experience and significantly more time.

Technical complexity grows with your goals

A Google Ads account has long consisted of more than keywords and text ads. With Performance Max and automated bid strategies, tracking is the most important element: server-side tagging or the Google tag gateway, enhanced conversions for better data quality and profit tracking (POAS instead of ROAS) so that Google optimizes for contribution margin and not just revenue. We describe how this works in detail in our guide to conversion tracking.

None of this is a one-time setup; it needs regular monitoring and adjustment. The more ambitious your growth plans with Google Ads, the more effort is required for optimization and data quality.

The number of campaigns says more about the effort than the budget

Many tasks in Google Ads can be automated and managed with AI. In our view, the budget is therefore not a good measure of effort. Despite all automation, 100 campaigns still almost always mean more work than 10: they need more monitoring and involve more changes.

A good agency discusses with you the account structure that brings performance and effort into a good balance. A simplified structure is often also the path to better results.

We bill with a retainer and projects so that your budget follows profit

At UnitedAds, we focus on capacity and strategy. You pay a fixed fee for ongoing optimization and invest in projects only when they are necessary. When a major changeover is coming up, we charge for the experience and time this step requires.

This creates clarity: we concentrate on the work on your account without looking at a commission statement at the end of the month. And because our fee doesn't depend on the ad budget, we can also recommend cutting budget that brings no profit. Trust arises when you see that your agency is working on the long-term success of your company.