“What should we spend on Google Ads?” is the question every accounting firm asks first, and it’s the wrong one. The number that matters isn’t your monthly budget. It’s what a client is worth to you over three years, because that figure decides whether $2,000 a month is reckless or embarrassingly conservative.
Key Takeaways
- Work backward from client lifetime value, not forward from a budget you picked because it felt safe.
- Below roughly $1,500 a month in a competitive metro, you’ll gather data too slowly for the account to ever optimize.
- Tax season and the rest of the year are two different businesses. Your budget should reflect that, and most firms flatten it.
- Advisory, CAS, and tax resolution keywords cost more per click and are usually still the better buy.
- Track booked consultations and signed engagements, not form fills. Form fills lie.
Start with what a client is worth
Pull your actual numbers rather than guessing. Average annual revenue per client, average years retained, and your gross margin on the work. A firm doing $2,400 a year in individual returns with a five-year average tenure is looking at $12,000 in lifetime revenue. A CAS client at $2,000 a month with a three-year run is at $72,000. Those two firms should not be spending the same amount to acquire a client, and yet they often do.
The rough rule most firms can live with: spend up to 10% of first-year revenue to acquire a client, and up to 20% if retention is strong and margins are healthy. At $12,000 lifetime value that supports something like $240 to $480 per acquired client. At $72,000 you can rationally spend a few thousand.
Now the conversion math. If 10% of clicks become leads and 25% of leads become clients, you need 40 clicks per client. At $12 a click that’s $480. Sits right at the edge of what an individual-return practice can justify, which is exactly why so many firms conclude Google Ads “doesn’t work for accounting.” It works fine. The service mix is what’s off.
The floor nobody wants to hear about
Google’s bidding systems need conversions to learn from. Roughly 30 in a 30-day window before automated bidding gets reliable. Below that you’re running on manual bids and thin data, and results swing wildly month to month.
In practice that means a floor of about $1,500 a month in a mid-sized market and $2,500 or more in a metro where CPCs run $15 to $30. Firms that start at $500 usually spend six months learning nothing, then conclude the channel failed. If $1,500 isn’t available, put the money into local SEO and your Google Business Profile instead and come back to ads later. That’s not a consolation prize. For a lot of small firms it’s the better first move anyway.
Where the money should go
Not all accounting keywords are the same purchase. Some are shopping trips, some are emergencies.
Tax resolution and IRS problems
Expensive clicks, sometimes $40 and up, and worth it. Someone searching “IRS wage garnishment help” has a problem with a deadline attached. They’re not comparing five firms over three weeks. If you do this work, this is where the strongest returns usually sit.
Advisory and CAS
“Outsourced CFO,” “virtual controller,” and similar terms carry high CPCs and long sales cycles. Someone might click in March and sign in July. Budget for that gap and don’t kill the campaign in week six because the cost per lead looks ugly.
Business tax and bookkeeping
The reliable middle. Moderate cost, decent volume, clients who stick. Most firms should anchor here.
Individual tax prep
Cheap clicks, terrible economics for most firms. You’re competing with software and with national chains whose whole model is volume. Run it only if individual returns feed something bigger, like a business owner who brings the company work along later.
Seasonality: stop spreading it evenly
January through April, search volume for tax terms climbs hard and so does competition. May through December it drops off, but so do the bids, and the people searching in August for a bookkeeper are often better prospects than the ones searching on April 12 for anyone with a free hour.
A pattern that works for a lot of firms: about 40% of annual budget in Q1, 20% in Q2, and the remaining 40% split across the back half with the emphasis on advisory and CAS terms rather than compliance. September and October in particular are underpriced, since extension deadlines create real demand while most competitors have gone quiet.
One caution about the January ramp. If you turn campaigns off in November and back on in January, the algorithm restarts its learning at the worst possible moment. Keep something running year-round even at a reduced level, if only to preserve the account’s history.
The parts of the budget that aren’t clicks
Ad spend is maybe 70% of what this actually costs. The rest is landing pages that match the ad, call tracking so you know which campaign produced which phone call, negative keyword work (you don’t want clicks from people looking for accounting jobs or free tax software), and management time.
Sending paid traffic to your homepage is the single most common waste we see. A firm bidding on “small business bookkeeping Denver” and landing people on a homepage that leads with the firm’s 1987 founding date is paying $18 for a bounce.
Measure to the engagement
Cost per lead is a comfortable metric because it’s easy to get. It’s also close to useless on its own. Two campaigns at $85 per lead look identical until you notice one produces $400 tax returns and the other produces $30,000 CAS engagements.
Push measurement down the funnel: cost per booked consultation, cost per signed engagement, and revenue per campaign. That requires connecting your CRM or practice management system back to the ad platform, which takes a weekend of setup and pays for itself many times over. Benchmarks worth aiming at: 4% to 8% click-through on search, 8% to 15% of clicks converting to a lead on a decent landing page, and 20% to 35% of qualified leads becoming clients. Miss those badly and the problem is usually the landing page or the intake process, not the budget.
The firms that get this channel to work aren’t the ones spending the most. They’re the ones who know what a client is worth and spend accordingly, then fix the leaks between click and signature.
