How much does marketing cost for an accounting firm is one of the first questions we get on a call, and it is usually asked in a form that cannot be answered honestly. A two person practice taking on local limited companies and a fifteen person firm running three service lines have almost nothing in common on the cost side.

What can be answered is the structure. Marketing spend in a practice breaks into a build cost, a media cost, and a labour cost, and the three behave in completely different ways. Once you separate them, the question stops being what does this cost per month and becomes what does each pound have to return before it earns its place.

Below is how we cost this out with firms we work with, what each channel actually demands to function, what different budget levels tend to produce, and the situations where paying someone else stops making sense.

The first line is build cost. Site architecture, service and niche landing pages, conversion tracking, CRM configuration, and the onboarding workflow that runs after someone signs. This is front loaded and largely one off. It should be treated as an asset with a life of several years, so judging it against a single month of enquiries makes no sense.

The second line is media cost. Google and Meta spend, data costs on outbound, anything you rent rather than own. It is variable, it stops producing the day you switch it off, and it is the only line most firms think about when they ask about marketing cost.

The third line is labour. Someone has to answer enquiries quickly, write the content, chase the people who went quiet, and keep the CRM honest. In a practice of 2 to 20 staff that person is usually a partner who already has a chargeable workload, which means the true cost is measured in displaced billable hours rather than invoices.

Most disappointing marketing budgets we review are not underfunded on media. They are underfunded on line three.

Google Ads carries the highest immediate cost per enquiry of anything a practice can run. Accountancy search terms sit among the more competitive local service categories, so a click on a high intent term costs a multiple of a click on a general information term. That is workable, provided the traffic lands somewhere built to convert. A campaign posted on AccountingWEB in mid 2026 recorded just over a hundred clicks in under a month and no conversions at all, with every click pointed at a homepage. The media was not wasted by the platform. It was wasted on arrival.

Search and content work the other way round. Cost is concentrated up front in architecture and writing, and the marginal cost of the fiftieth enquiry is close to nothing. In our experience movement takes roughly two to six months depending on the competitiveness of the niche and the state of the existing site.

Meta buys cheaper attention with weaker intent, which means it needs an offer and a follow up sequence to convert anything. Outbound built on registry data shifts cost into data, tooling, and reply handling. A Google Business Profile costs almost nothing in cash and a real amount in attention.

The correct starting point is not a percentage of turnover. It is what one new client is worth to you.

Three numbers decide everything. Your average annual recurring fee per client, your gross margin on delivering that work, and how long clients stay. A firm winning recurring compliance and advisory work with clients who stay four or five years can afford an acquisition cost that would bankrupt a practice selling one off self assessment returns. Same channels, same click costs, completely different maths.

From there, work out how many months of fees you are willing to hand over to win a client, and how long you can wait to get that money back. A practice with tight cash flow needs a payback period inside a year, which rules out some channels and makes others obvious.

The rule of thumb that circulates on practice forums, spending 10% to 15% of turnover on marketing, is a general business average rather than a benchmark for accountancy. It is a reasonable ceiling check once you know your acquisition cost. It is a poor way to choose one. If you want the mechanics, see how to measure marketing ROI for an accounting firm.

At the lowest level, no cash and partner time only, you can do real work. Google Business Profile, review collection, referral partner conversations, and cross selling the existing client base. Expect a slow compounding trickle rather than flow, and expect it to stall the moment January arrives and the time disappears.

One channel funded properly is where most firms of this size should start. Enough media or enough content investment in a single niche, pointed at pages built for that niche, with follow up handled inside a day. This is where measurable enquiry volume appears within a quarter. The risk is concentration, since one channel means one point of failure.

Two channels plus the underlying infrastructure is where the numbers get stable, because search covers the people already looking and paid or outbound covers the ones who are not. Retention of enquiries improves as well, since the CRM catches the ones who are six months away from switching.

The pattern that reliably produces nothing is a modest budget spread across four channels. Nothing gathers enough data to be judged, every channel looks mediocre, and the conclusion drawn is that marketing does not work for accountants.

Doing it in house is the better economics more often than agencies admit. Three situations stand out.

The first is when you have spare capacity and constrained cash. If a partner or a junior has genuine hours available, the relationship led work costs nothing but time and outperforms most paid channels on return. Reviews, referral partners, and existing client conversations are all in this category.

The second is when your positioning is undecided. Paying for traffic before you know which type of client you want is how budgets disappear. Broad targeting on general accountancy terms competes with everyone and converts poorly, and no amount of media fixes it. Settle that first, which is what choosing a niche for your accounting firm is for.

The third is when you cannot service more clients. Buying enquiries you have no capacity to onboard produces a worse client experience and slower responses, which then damages the channel you paid for.

Bringing someone in makes sense when the constraint is implementation speed, when the technical build is beyond what the practice can do internally, and when there is fee capacity waiting to be filled.