How Much Should a Small Law Firm Spend on Marketing?

Why asking for a percentage is the wrong starting point

When owners ask how much they should spend on marketing, they usually want a number they can apply immediately without doing the underlying math. The problem is that a percentage taken from another firm or an industry article reflects that firm's practice area, fee structure, competition, and client acquisition cost, none of which may match yours. A criminal defense firm in a mid-size city and a business transactions firm in a suburb may share a revenue figure but have completely different economics for acquiring each client.

The percentage question also hides the relationship between spend and expected outcome. Knowing that a firm spends eight percent of revenue on marketing tells you nothing about what that spending produces. The number that actually connects budget to decision-making is cost per signed client: how many dollars does it take, at the channels you currently use, to produce one signed matter? That figure, not a percentage, is the starting point for setting a defensible budget.

Working backward from a client goal to a spending number

A budget built on goals is easier to defend and adjust than one built on habit or imitation. Start by writing a specific number: how many new signed clients do you want in the next 12 months beyond what you would expect without any additional effort? That number gives you a target. Multiply it by your current cost per signed client for each channel and you have a rough budget. If you do not yet have a reliable cost per client, use a conservative estimate based on your recent experience and plan to refine it as you collect data.

Next, compare that budget to the value of the work it should produce. If your average matter fee is $4,000 and you want 20 additional clients, the target revenue from new clients is $80,000. If your budget to acquire them is $10,000, the return on that spend is 8 to 1 before costs of delivery. If the budget is $40,000, the math is much tighter and you need to be confident in your cost-per-client estimate before committing. The exercise does not require precise numbers to be useful; it forces a comparison between investment and expected return.

A simple calculation you can do this week

• Write your new-client goal for the next 12 months as a specific number.
• Multiply by your current or estimated cost per signed client.
• Compare that total to the expected fees from those matters.
• Identify which channels have a documented cost per client and which are still estimates.

What to count when you calculate your marketing spend

Many owners underestimate their marketing spend because they only count direct payments to vendors or ad platforms. A more accurate picture includes staff time spent on marketing activities, the cost of producing content or creative materials, event attendance and sponsorships, dues to organizations joined primarily for referral access, and any subscriptions to marketing tools. When you add internal labor costs, the true investment in marketing is often larger than the line item on the income statement.

The reason to count everything is that the cost-per-client calculation is only meaningful if it includes the full cost of producing each client. If a channel appears cheap because you are not counting the 10 hours per month your paralegal spends managing it, the math is misleading. Assign a reasonable hourly cost to internal time and add it to direct spend before comparing channels.

Explore more practical client-development ideas in 151 Ways to Get More Clients.

How to set a test ceiling before funding an unproven channel

Every new channel should begin with a pre-set test ceiling: a maximum dollar amount and a defined time period, after which you evaluate the result against a specific metric before deciding whether to continue. The ceiling is not a guess at what the channel will need to succeed; it is the amount you can invest without harming the firm's cash flow while waiting to see a result. Define the ceiling before you start, not after the first bill arrives.

At the end of the test period, compare actual signed clients to the spending and decide: does the cost per client justify scaling the channel, does it need adjustment before another test, or does it make sense to stop? A channel that produces no traceable signed clients after a consistent, fully funded test period is not necessarily a permanent failure, but continuing to fund it without that conversation is how marketing budgets grow without growing the firm.

Protecting proven marketing spend during slow periods

The instinct to cut marketing in a slow month is understandable but often counterproductive for channels with a documented positive return. Marketing affects the pipeline weeks or months later, not immediately. Cutting a channel in November because October was slow may reduce client flow in January and February, exactly when the firm needs it to recover. Identifying which channels have a documented return before the slow period arrives makes the decision cleaner.

When cash is genuinely tight, a practical sequence is to cut or pause channels you cannot measure, reduce spend on channels with a high documented cost per client, and protect channels with a documented low cost per client and a positive return on spend. If everything needs to be cut temporarily, do it across the board and document the restart date so the pipeline effect is anticipated rather than a surprise.

Building a defensible budget in the first 30 days

The goal of the first 30 days is not to produce the perfect budget. It is to replace guessing with documented inputs. Start by pulling 12 months of actual marketing spend from your records, including all vendor payments, ad platforms, and a good-faith estimate of internal time. Divide by the number of clients signed to produce a blended cost per client. That number is a baseline, not a verdict.

In the second week, assign each channel a spend figure and a signed-client count for the period. Some channels will have no traceable clients; mark those as unknown rather than zero. In the third week, write your new-client goal and calculate the implied spend. In the fourth week, set a test ceiling for any channel currently in the unknown category and write a review date. By the end of 30 days you will have a budget you can defend with actual firm data.

• Pull 12 months of all marketing-related spend, including estimated internal labor.
• Divide total spend by signed clients for a blended cost-per-client baseline.
• Assign spend and signed-client counts to each individual channel.
• Write a new-client goal and calculate the implied annual budget.
• Set a test ceiling and review date for every channel currently without traceable results.
• Schedule a monthly 30-minute budget review using cost per client as the primary metric.

Key terms used in this guide

Cost per signed client

Total marketing spend on a channel divided by the number of clients who signed matters traceable to that channel. This figure lets you convert a budget into an expected client count.

Return on marketing spend

Fees collected from new matters divided by the marketing dollars spent to produce those matters, calculated by channel. A figure greater than one means the spend returned more than it cost.

Test ceiling

A pre-set maximum spend on an unproven channel for a defined evaluation period, after which you decide whether to scale, adjust, or stop based on actual results.

Frequently asked questions

Sources and further reading

• U.S. Small Business Administration, Marketing and Sales General guidance on planning and measuring marketing budgets for small businesses.
• American Bar Association, Model Rule 7.2 Ethics rule on advertising and referral payments, which affects how marketing dollars can legally be spent.
• American Bar Association, Law Practice Division Resources on law firm financial management and practice operations.