Most budget advice for law firms starts with a percentage of revenue and stops there. Percentages are a fine starting point, but personal injury is its own economy: cases are high value, competition is priced accordingly, and revenue arrives in lumps when cases settle. Here is how we think about the number, based on the spend patterns we see across New Jersey PI firms.
The percentage benchmarks, for what they are worth
Commonly cited benchmarks put law firm marketing between two and ten percent of gross revenue, with personal injury firms clustered at the high end and aggressive growth-stage firms above it. A PI firm in a competitive metro that wants to grow, not just maintain, typically cannot do it under five percent. Firms in land-grab mode often run well past ten. Treat these numbers as a sanity check, not a plan.
The better question: what does a signed case cost?
Budgets built on percentages drift. Budgets built on unit economics compound. The number that matters is cost per signed retainer, and it varies enormously by channel. Referrals and past-client marketing produce the cheapest cases, often costing little more than the time to run the process. Direct mail from crash reports sits in the middle: a steady program produces signed cases at a fraction of what paid media costs, and we showed the full math in the true ROI of direct mail. Paid search sits at the expensive end, where a signed case routinely costs several thousand dollars once you account for clicks that never call and calls that never sign. Brand media is the most expensive of all in the short term, because it produces nothing measurable for months.
Sizing the budget by firm stage
If you are a solo or small firm, the full week-by-week version of this advice is in our small firm marketing playbook.
Solo firm. Set a floor you can sustain every single month, even a modest one, and put it into the two or three channels with the lowest cost per case: the referral process, local search, and a consistent direct mail program. Consistency beats size at this stage; a mail program that runs every week for a year beats a burst that runs for six weeks and stops.
Small firm, two to five attorneys. This is usually where a real budget line appears, often in the five-to-eight-percent range. Add content and, if intake is strong, carefully tracked paid search. The biggest risk at this stage is spreading the budget across six channels and funding none of them properly.
Growing firm. Above this size the question stops being what to spend and becomes what each channel returns at the margin. That requires tracking every intake to its source, which surprisingly few firms actually do.
The three budget mistakes we see most
First, quitting channels early. Nearly every channel in legal marketing needs three to six months to show its true cost per case, and mail sequences in particular improve with repetition, as our multi-touch case study shows. Second, measuring leads instead of cases. A channel that produces cheap leads and no retainers is not cheap. Third, treating the budget as discretionary. The firms that grow treat marketing like rent: it gets paid first, every month, in good months and bad.
For how the spend should be split across channels, see SEO vs direct mail: where the budget goes, and for the full channel map, start with how to market a PI firm in New Jersey. And if you want to know exactly what a direct mail program would cost for your county mix, ask us; we will give you the real number, not a range.
See how a mail-led program is priced on our personal injury lawyer marketing page.