Law Firm Marketing for Personal Injury: How to Split Budget Across SEO, LSA and PPC Using Case-Value Math
Stephen Gardner · Published · 8 min read
Law firm marketing for PI firms: how to split budget across SEO, Local Services Ads and PPC using your own case-value math, within ABA advertising rules.
# Law Firm Marketing for Personal Injury: How to Split Budget Across SEO, LSA and PPC Using Case-Value Math
Law firm marketing for a personal injury practice comes down to a question of arithmetic: what is a signed case worth to your firm, how many inquiries does it take to get one, and which channels deliver those inquiries at a cost that makes sense? This guide gives you a way to answer that with your own numbers instead of borrowed benchmarks. Then it explains what each major channel (SEO, Google's Local Services Ads and paid search) is actually good at, so the budget split follows from the math instead of from a vendor's pitch.
Quick summary
- Start with your firm's own case-value and conversion numbers. Industry averages are not a plan.
- SEO builds an asset slowly. Local Services Ads and PPC buy visibility now, with ongoing cost.
- Each channel has a different role. A sensible mix usually assigns one job to each.
- Every channel has its own rules under ABA Model Rules 7.1 and 7.2 and state law.
- Every number in the worked example below is hypothetical and exists only to show the arithmetic.
The math that should come before the budget
You need four numbers from your own records. Do not use anybody else's.
- Average fee to the firm per resolved case, net of whatever your accounting treats as case costs. Your own books decide this; it differs by case type and by firm.
- Signing rate: of the qualified inquiries you receive, how many sign?
- Qualified rate: of all inquiries, how many are cases you would actually take?
- Time to revenue: how long from signing to fee, since marketing spend comes first and fees come months or years later.
Then work backward. Here is a made-up example, only to show the arithmetic (these are not benchmarks and should not be quoted):
- Suppose the firm decides it can afford to spend up to 10 units of money per signed case.
- Suppose 1 in 3 inquiries is a case it would take, and 1 in 4 of those signs. That means roughly 12 inquiries per signed case.
- Then the firm can afford up to about 0.83 units per inquiry.
Replace those figures with yours. If the number that comes out is lower than what a channel charges per inquiry in your market, that channel is not a fit at the moment, no matter how well it works for a different firm. If it is higher, the channel can be tested, and the test should be judged on signed cases, not clicks.
Two cautions. First, a firm that loses a case earns no fee, so the "average fee" should reflect your realized results, not your best outcomes. Second, your intake process changes the signing rate more than any ad does, which is why this guide treats response speed as part of marketing. See our legal intake guide.
What each channel is actually for
SEO: the asset you keep
Search engine optimization improves how your site and Google Business Profile show up in organic and map results. It takes time, you cannot pay Google for a better local ranking (Google says so directly), and it is not a faucet you can turn off and on. What you get is a set of pages, reviews and links that keep working. For a PI firm, the work is accident-type pages, attorney credibility, reviews, local links and a fast, clear site. We cover the content mix in our guide to personal injury lawyer SEO.
Role in the budget: a steady, long-horizon base. Judge it over quarters, not weeks.
Local Services Ads: pay per lead, with verification
Google describes Local Services Ads as ads that deliver leads as phone calls and messages from potential customers, where you pay for leads related to your business. For lawyers, Google lists categories including personal injury, and its screening requirements for personal injury lawyers include business owner identity verification and state bar license checks for each personal injury lawyer in the firm, plus professional liability insurance and other checks for select users. Ads appear in a unit prominently in search results, and Google says if you regularly fail to answer calls or respond to messages, your ad ranking may be affected. We cover the mechanics in our guide to Google Local Services Ads for lawyers.
Role in the budget: a test for fast, intent-rich calls, where you set a budget and judge the leads by signed cases. It needs a phone that is answered.
PPC (paid search): control and speed, at auction prices
With pay-per-click ads, you bid on searches and pay when someone clicks. It offers control over terms, geography, schedule and landing pages. The cost per click and competition are set by the auction in your market, so we are not quoting averages. Landing-page quality, tracking and intake matter as much as the bid.
Role in the budget: precise, scalable, but only as good as your tracking. Best for specific case types or periods when you have capacity to take cases.
Everything else
Referral relationships, community presence, legal directories and sponsorships can all contribute. Two rules apply to anything that sends you leads. ABA Model Rule 7.2(b) generally prohibits paying someone for recommending your services, and the commentary says directory listings that merely list lawyers by practice area are not recommendations. The commentary also says you may pay for lead generation as long as the lead generator does not recommend you, any payment is consistent with fee-division and professional independence rules, and its communications comply with Rule 7.1. A lawyer must not pay a lead generator that states or implies it is recommending the lawyer, that it is making the referral without payment, or that it has analyzed a person's legal problems when choosing the lawyer. Have counsel read any lead-gen contract.
A framework for splitting the budget
Instead of a percentage chart, use a sequence.
Step 1: Make sure the base works. Before paying for traffic, confirm that your Business Profile is accurate, your site loads quickly on a phone, the phone is answered, and intake is tracked. Paid channels make a leaky funnel more expensive.
Step 2: Fund SEO as a long-term base. Decide the monthly amount you can sustain for at least two quarters without needing it to pay back immediately.
Step 3: Test one paid channel with a ceiling. Pick LSA or PPC based on which fits your case types and capacity, set a monthly cap and a review date, and track signed cases by source.
Step 4: Add the second paid channel only after the first is measured. Running everything at once makes it impossible to see what worked.
Step 5: Reallocate on evidence. After a few months, compare each channel's cost per signed case with your affordable ceiling from the math section. Move money toward what clears it.
Your split will not look like another firm's. A solo practitioner with limited intake capacity should be cautious about spending that generates more inquiries than they can handle. A larger firm with a full intake team can absorb more volume.
Tracking: the thing that makes the math possible
You cannot allocate a budget without knowing where cases come from.
- Use call tracking and form tracking, with a source field intake fills in on every call.
- Keep a simple sheet: date, source, qualified or not, signed or not, case type.
- Review monthly with the people who answer the phone, not just the ones who read the dashboard.
- Mark leads you did not take, and why. Patterns here show what to change in your targeting.
Ethical guardrails that apply to every channel
- Truthful, not misleading (Rule 7.1). The commentary says even truthful statements can mislead if they omit a necessary fact or create an unjustified expectation. Ad copy such as "we win" or "maximum compensation" deserves counsel review.
- Results and testimonials. Truthful reports of past results can still mislead if presented so a reasonable person expects the same results for others; qualifying language may help.
- Contact information. Rule 7.2(d) requires communications to include the name and contact information of at least one lawyer or law firm responsible for the content.
- Solicitation. Rule 7.3 generally restricts live person-to-person solicitation of a specific person for pecuniary gain, with exceptions. Do not blur ads with outreach to specific accident victims.
- State rules. States modify the model rules, sometimes significantly. Verify yours.
Frequently asked questions
What percent of revenue should a law firm spend on marketing?
We do not have a sourced figure to give, and a general percentage is a poor guide anyway. Work backward from your own case value and conversion numbers, then test.
Is SEO or PPC better for a personal injury firm?
They do different jobs. SEO is a slower asset; PPC is faster and ends when the budget does. Many firms use both, with clear roles and tracking.
How long before SEO produces cases?
It varies with competition, your starting point and your capacity to produce good content and reviews. Anyone promising a date or a number of cases is guessing.
Can I pay a company to send me leads?
Under the ABA commentary you can pay lead generators in some circumstances, but not ones that recommend you or misrepresent how referrals are made. State rules vary. Have counsel review the arrangement.
Should my budget change if I am a small firm?
Yes. Size your marketing to the number of cases you can handle well. More inquiries than intake can answer will waste spend.
Build your own numbers with us
If you want help turning your firm's data into a channel plan, our personal injury SEO team can walk through it, as part of our legal SEO work.
This article is general marketing information, not legal advice. The ABA Model Rules are models; each state adopts its own advertising rules. Confirm requirements with your state bar or ethics counsel. The numerical example is hypothetical and not a benchmark.