27,281 Accounting Firms: What They Actually Advertise, Service by Service

Most lists of "accounting firm services" are written from a template, not from what firms actually sell. We profile US accounting firms from their own public websites, so we can count instead: across 27,281 firms, tax preparation is the single most advertised service at 12,483 firms, bookkeeping is second at 11,715, and no service in our taxonomy is offered by a clear majority of the market.

That last fact is the useful one. There is no such thing as a standard accounting firm. The average firm that advertises anything at all advertises 2.91 services out of 22, which means the firm you are looking at is far more likely to be missing what you need than to cover everything.

What do accounting firms actually advertise?

Every service listed on a firm's own site, mapped into 22 categories, counted across the whole corpus. Percentages are of all 27,281 firms.

Tax preparation and bookkeeping together account for 24,198 of the 57,290 firm-to-service links in the dataset, 42% of everything advertised by two categories out of 22. The bottom eight categories together account for 2,666 links, about half of what payroll alone carries.

Why is nothing offered by a majority?

Partly because a lot of firms advertise very little. Of the 27,281 firms, 19,705 list at least one service we can categorise and 7,576, or 27.8%, list none at all. That second group is mostly firms with a one-page site or a listing that exists because we matched it to a state licence record: they are real firms, they just do not publish a service menu. Their average description is 237 characters against 258 for the rest, and only 5.1% of them name any software against 19.0% of firms that do list services.

Among the 19,705 firms that do publish a menu, breadth is modest:

The widest menu in the corpus is 15 services, held by a single firm. Fewer than one firm in sixteen advertises six or more. If a firm's site reads like it does everything, it is unusual, and worth a question about which of those lines is actually staffed in house.

Which services travel together?

The pairs tell you what a "full service" firm usually means in practice.

Bookkeeping and tax preparation is the spine of the industry, and it is still only 7,610 firms, 27.9% of the market. The split around it matters more than the overlap: 4,873 firms advertise tax preparation without bookkeeping, and 4,105 advertise bookkeeping without tax preparation. If you assume the person doing your books will also file your return, you will be wrong roughly as often as you are right.

For the difference between those two jobs and who is qualified to do each, see bookkeeper vs accountant vs CPA.

Where is the long tail, and who lives there?

The bottom of the table is not noise. It is where the specialists are, and the counts are small enough that the specialist pool for any given need is genuinely thin.

Some of these firms do nothing else. Counting firms whose entire advertised menu is a single service:

Audit and assurance stands out. It is the fifth most common service overall, but 720 firms advertise it and nothing else, the highest single-service rate of any category outside the two giants. Audit is the part of the profession most likely to be a firm's whole business rather than a line on a menu, which is what you would expect from a service with its own independence rules. Forensic accounting behaves the same way at smaller scale: 71 of 814.

At the other end, 840 firms advertise only services from outside the top five. That is the pool to search when your need is not tax, books, payroll or an audit.

Two counts in the long tail understate reality and we would rather say so than let you read them straight. Catch-up and cleanup bookkeeping shows 201 firms, but most firms that will happily clean up two years of neglected books simply call it bookkeeping. Nonprofit accounting shows 161 firms as a service, while 1,405 firms tag nonprofits as an industry they serve. Both numbers are real counts of what firms wrote, and neither is a count of capability. Our catch-up bookkeeping guide covers what to ask for when the phrase is not on the site.

What should you do with this?

Shortlist on the second service, not the first. Almost every firm does tax preparation or bookkeeping. What separates them is the third and fourth line on the menu, and the pair table above tells you which combinations are common enough to find easily.

Treat a missing service as missing. With an average of 2.91 advertised services, silence usually means they do not do it, not that they forgot to mention it. Ask directly rather than assuming.

Expect to hire twice for anything specialised. Business valuation, forensic work, international tax and R&D credits are each held by under 3% of firms. Your generalist will most likely refer you out, and it is worth asking who they refer to before you need it.

Do not read a long menu as depth. Six or more services puts a firm in the top 6% for breadth. That can mean a large firm with real departments, or a small one that lists everything it has ever been asked to do.

You can browse the full service directory, or start with bookkeeping, the category most people arrive on. If you are weighing whether a part-time finance lead belongs on your list, see when to hire a fractional CFO.

For the size of the profession as a whole, the US Bureau of Labor Statistics tracks employment for accountants and auditors in its Occupational Outlook Handbook. That counts people in the occupation, including everyone working inside a company rather than at a firm, so it is a different measure from anything on this page.

Method

What was counted. Every service phrase published on the public website of each of 27,281 US accounting firms in the AccountingNearYou corpus, as of 28 August 2026, mapped to a fixed taxonomy of 22 services. A firm counts once per service regardless of how many times it says it. The result is 57,290 firm-to-service links across 19,705 firms.

From what. Firms' own sites. Nothing here comes from a survey, a filing, a purchased list or a licence body.

What these numbers do not mean. They are not a census of US accounting firms, and they are not a measure of capability. A firm that does payroll but does not mention it on its site is counted as not offering payroll, because that is all we can observe. The corpus undercounts firms with thin websites: 7,576 firms here list no service at all, and many of them certainly do the work. The mapping is phrase based, so a firm using an unusual name for a common service can be missed. Counts move as firms rewrite their sites and as the corpus grows, so treat these as a snapshot of what US accounting firms advertised in August 2026, not as a fixed fact about the industry.