Pricing structure shapes how your Google Ads agency behaves. The choice between percentage of spend vs flat fee PPC pricing determines whether your agency gets paid more when you spend more, or whether their fee holds steady regardless of budget. For a small or mid-size family law firm, that distinction changes the recommendations you'll get, the budget conversations you'll have, and the way success is measured.
For the complete picture, see our The Complete Guide to Vetting a Family Law PPC Agency.
Both models are common. Both have legitimate agencies behind them. The right one for your firm depends on your budget, your growth plans, and how closely you want fee structure tied to the agency's own incentives.
This guide walks through how each model works, what each one rewards, and the criteria you can apply to your own situation. You'll leave with a clear way to evaluate proposals on your desk right now.
How Percentage of Spend Pricing Works
Under percentage of spend pricing, the agency charges a management fee calculated as a share of your monthly ad spend. Common ranges fall between 10% and 20%, with some agencies setting floors for smaller accounts. If you spend $5,000 a month on Google Ads and the fee is 15%, you pay $750 in management on top of the media.
The model scales with your account. Spend $10,000 and the fee doubles. Spend $20,000 and it doubles again. Agencies like this structure because revenue grows alongside the client, and larger budgets often do require more management hours for additional campaigns, geographies, or sub-practice areas.
For firms, the appeal is that fees stay proportional to the investment. A smaller firm pays less. A firm scaling up pays more. On paper, it feels fair.
The structural detail worth understanding is where the incentive points. When fees are tied to spend, higher budgets generate higher revenue for the agency. Many percentage-based agencies manage this incentive responsibly and recommend budgets based on actual market opportunity. The incentive still exists, and it's worth weighing when you evaluate growth recommendations.
How Flat Fee Pricing Works
Flat fee pricing sets a fixed monthly management fee regardless of what you spend on ads. You might pay $2,000 or $3,500 a month in management, and that number holds whether your ad budget is $4,000 or $14,000. The media spend goes directly to Google. The agency fee is separate and predictable.
Flat fee structures usually come with a defined scope: a set number of campaigns, geographies, or sub-practices. If you want to expand beyond that scope, the fee gets renegotiated. That's a feature, because it forces an honest conversation about whether added complexity actually warrants added investment.
The appeal for firms is predictability. You can budget twelve months ahead without wondering what management will cost if you push spend up during a seasonal push or pull back during a slower quarter. Your spend decisions get decoupled from your agency's revenue.
Flat fee works best when both sides agree on scope upfront and revisit it when the account genuinely grows. It also puts pressure on the agency to be efficient with hours, since they're not earning more by recommending bigger budgets.
What Each Model Rewards
Every pricing model creates incentives. Understanding what each one rewards helps you anticipate the kinds of recommendations and conversations you'll have with your agency over time.
Percentage of spend rewards:
- Growing account size, whether through higher budgets, additional geographies, or new campaign types
- Taking on larger clients with more complex needs
- Recommendations that often lean toward scaling spend when performance supports it
Flat fee rewards:
- Efficient use of agency hours within a defined scope
- Clear scope conversations before expanding the account
- Recommendations tied to performance outcomes rather than budget size
Neither set of incentives is inherently bad. A percentage-of-spend agency recommending a budget increase might be reading the market correctly. A flat fee agency staying within scope might be respecting the engagement you agreed to. The question is whether the structure aligns with how you want decisions made in your account.
Criteria to Apply to Your Own Situation
Use the following criteria to pressure-test which pricing model fits your firm. Walk through each one with your current or prospective agency's proposal in hand.
- Current and projected ad spend. If you're spending under $5,000 a month, percentage fees often fall below agency minimums, which means you'll end up on a floor fee anyway. Flat fee pricing tends to make the math clearer at smaller budgets. At $15,000 and up, percentage fees can climb quickly, and flat fee may be the more cost-efficient structure if scope stays stable.
- How often you expect budget to change. If you anticipate meaningful fluctuation up or down across the year, flat fee gives you flexibility to adjust spend without a management fee swing. If you're on a steady upward trajectory and plan to invest more every quarter, percentage of spend scales naturally with that growth.
- How you want recommendations framed. Ask yourself whether you want an agency whose revenue grows when your spend grows, or an agency whose revenue is independent of that decision. Both can produce good work. Your comfort with the incentive matters.
- Scope clarity. Flat fee requires a clear scope. If your firm handles divorce, custody, child support, and adoption across several geographies, that scope needs definition upfront. If scope is fuzzy or likely to shift often, percentage of spend may absorb that variability more smoothly.
- How performance gets measured. Neither model ties fees directly to consultation outcomes. Make sure reporting is built around consultations booked, cost per lead, and lead quality regardless of pricing structure. The fee model shouldn't change what you're measuring.
- Agency size and client load. Larger agencies often default to percentage pricing because it supports their overhead and growth model. Boutique agencies working with a smaller roster are more likely to offer flat fee because their capacity planning works differently. If you want senior attention on your account, factor that in.
Run every proposal through these six questions. If an agency can't walk you through how their pricing aligns with your situation, that's useful information too. For more context on evaluating agency fit specifically for family law, our resources library covers vetting questions, benchmark fees, and the handover process when switching providers.
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Which Model Fits a Small Family Law Firm
Small firms, roughly solo to five attorneys, tend to benefit from pricing structures where the agency's revenue doesn't depend on budget growth. The reason is practical. Smaller firms often have less flexibility to scale spend quickly, and the right recommendation in any given month might be to hold steady, reallocate between campaigns, or even reduce budget during a slow stretch.
Flat fee pricing keeps those conversations clean. The agency gets paid the same whether this month's recommendation is to spend $6,000 or $9,000, so the recommendation reflects what the account needs rather than what the fee structure favors.
There are exceptions. A small firm planning aggressive growth over the next twelve months, with a clear budget runway and the intake capacity to handle more leads, may find percentage pricing acceptable because the growth is already planned. The fee scales with a trajectory you've chosen, not one being recommended to you.
The common thread for small firms is alignment. You want a fee structure where the agency makes money by doing good work, by keeping you as a client, and by growing your account only when growth genuinely serves your firm. At ORSA, we work with a limited roster of family law firms and structure engagements so that fee discussions and performance discussions stay separate. That's a deliberate choice tied to who we serve.
Percentage of spend pricing ties the agency's fee to your budget. The results you actually care about, consultations booked and qualified cases signed, sit outside that formula. Flat fee pricing holds the fee steady so budget decisions and agency revenue stay separate, which matters more the smaller your firm and the tighter your margin for wasted spend.
The deeper point is that pricing is a signal. It tells you what the agency optimizes for, how they think about scope, and how aligned their business model is with yours. Pick the structure that lets you have honest budget conversations without wondering whose interest is being served.
Look at your current agency proposal or invoice this week. Ask yourself: if my spend dropped 30% next quarter because that's what the data recommended, how would this fee structure respond, and would my agency recommend it? If you'd like a second read on a proposal you're evaluating, you can get in touch here.
