What does a marketing agency actually do?

A proposal lands in your inbox with a monthly number at the top and a list of nouns underneath it: strategy, SEO, content, paid media, reporting. The number is specific. The nouns are not, and the gap between them is where most bad agency relationships begin.

Underneath those nouns, a competent agency runs five recurring jobs, and it runs the same five whether the retainer is six hundred dollars a month or six thousand. The channels change and the order shifts, but the five jobs stay put.

• Strategy and priorities. Deciding what to do next, in what order, and saying no to the rest of the list out loud.
• Channel work. Running whichever channels you bought: search, paid media, email, content, social, local listings.
• Creative. Copy, design, landing pages, ad assets, video. This is the job that makes the most files and the least argument.
• Measurement. Conversion tracking, call tracking, dashboards, attribution. This is the job that makes the most argument and the fewest files.
• A decision cadence. A monthly report and a talk where somebody states what changed, what it produced, and what happens next.

Knowing those five changes what you buy and what you ask for. It tells you what a normal month should hold, what belongs in the first 90 days, which costs are the agency's and which are yours, and which promises no agency can keep. Most of it you can check without hiring anyone.

That figure counts work, not companies. Firms send out about a third of the digital marketing tasks and keep the rest, which is why lasting agency deals add to an in-house owner instead of replacing one. Asked how they build new marketing skills, the same leaders put 59.5% of their weight on building in-house, 38.5% on partnering and 1.9% on buying. Agencies take 15.5% of the partnering answer, close to the 15.1% they scored in 2020.

Whether hiring out is normal for you depends on what you sell. Consumer product firms send out 48% of their digital marketing work and consumer services 44%, against 28% for B2B product firms and 25% for B2B services. Retail and wholesale runs highest at 57%. Education runs lowest at 3%. So a roofer who hires an agency is doing the ordinary thing, and a B2B services firm doing the same sits in the minority. That is worth knowing before you take advice from a peer whose business works nothing like yours.

The retainer names channels, and the work inside each name is narrower than the noun suggests. Search work splits into technical fixes, content, and the local listings that feed the map pack. Paid media splits into account structure, keywords and audiences, creative, landing pages, and the long list of negative keywords that keeps the junk out. Email covers list health, the sends themselves, and the automated sequences that run whether anyone is at a desk or not. Ask which parts of each noun you are buying, because SEO on a $700 retainer and SEO on a $7,000 retainer buy very different amounts of work.

One workstream is new enough that its absence tells you something. In the 2026 CMO Survey, 41.5% of companies already work on getting their content to appear inside AI-generated search results, a line that did not exist in the survey two years earlier. An agency still selling ten blue links as the whole of search is describing a shrinking surface. Ask how they measure visibility inside AI answers, and what that number was last month.

The other tell is where the money goes. Acquisition budgets now run 26.0% larger than retention budgets, up from 19.6% a year earlier, and the same survey notes this happening even as retention delivers stronger performance results. New leads are easy to see and easy to bill for. The cheapest revenue in most small businesses is a customer list you have not emailed since spring, which is why email and win-back work belongs in the scope alongside the ad account.

The label on the door tells you less than the scope document does. Some firms calling themselves marketing agencies handle strategy, media and measurement. Others are creative shops with a strategist attached. The difference between a marketing agency and an advertising agency comes down to where the work starts. The only sure way to tell which one you are talking to is to read the work list line by line.

The first 90 days have one job, which is to produce evidence. Campaigns that launch before tracking is verified generate arguments instead of numbers, and those arguments tend to run for the length of the contract.

1. 1

   Week one: install and verify tracking

   Conversion tracking on every form, phone call and booking, then a test conversion fired while you watch it land. Call tracking if your leads arrive by phone, because forty calls means nothing until you know how many came from new customers. Analytics and Search Console connected, and every account created under your ownership with the agency added as a manager.
2. 2

   Weeks two to four: baseline, scope, and a written rule for a lead

   A written starting point for traffic, leads, cost per lead and revenue, so that month three has something to be measured against. A work list with counts and dates on it. And one agreed sentence for what counts as a qualified lead, settled by both sides before a dollar of media runs.
3. 3

   Days 30 to 60: first campaigns live, first real report

   Paid channels can produce leads inside the first two weeks once tracking and creative are ready. Organic and content work builds over quarters instead. A useful first report says which is which rather than blending both into one line.
4. 4

   Days 60 to 90: the first honest revision

   By now something has fallen short. The test is whether the agency names it before you do, and turns up with a specific change and a date rather than a paragraph about market conditions.

You can build that baseline yourself before anyone starts, and holding your own copy of it changes the tone of every later talk. Our free SEO report checks any URL for speed, on-page issues and AI visibility in about 30 seconds, with no signup. That is enough to date-stamp where the site stood on day zero.

Most of the trouble in these deals is about scope rather than quality. The exclusions rarely appear in the pitch deck, and they surface in month four when somebody asks why the leads are not being called back.

• Answer your phone, call leads back, or close sales. If the phone goes unanswered for a day, no agency can fix that from outside the building.
• Set your prices, fix your product or service, or manage your staff.
• Clean your CRM. An agency can build the fields, the pipeline and the automation, but your team still has to fill them in.
• Pay for media, software licenses, stock photos, printing and third-party fees. Those usually pass through at cost outside the retainer, so ask which line is fee and which is spend.

A scope gap gets expensive in a specific way. When profits fall short, 53.1% of companies respond by cutting costs, and marketing is the line cut 45.4% of the time, ahead of every other category. An agency hired to fix a sales follow-up problem will fail at it, be blamed for it, and be cancelled over it. The next agency then inherits the same problem.

Reporting is the weak spot this industry admits to. On a seven-point scale, marketing leaders rate their ability to show a return on marketing technology at 4.4, and their ability to produce that return at 4.5. No marketing technology activity in the 2026 survey scored above a 5.

The barriers those leaders name are ordinary and fixable: 20.1% cite a lack of budget, 19.1% cite tech integration and data plumbing, 14.1% cite time and focus, and 13.1% cite talent. Two of those four are plumbing, which is the case for spending week one on tracking rather than on campaigns.

A report you can use has four traits. It leads with business outcomes: leads, qualified leads, cost per lead and revenue, each against the target you agreed at the start. It lives in a dashboard rather than a monthly PDF, because Looker Studio is free and a dashboard you can open on a Tuesday beats a document that lands on the ninth. It keeps the channel detail in an appendix, where impressions and ranking charts belong. And it names what fell short in plain words, with a dated plan to fix it.

Every number in that report rests on the analytics setup underneath it. That setup is duller than the report design and matters more. We published how a correct GA4 setup gets built in full, so you can check that work instead of trusting it.

Published ranges for small-business retainers tend to come from pages that sell retainers. The surveyed numbers are lower and more scattered than the folklore, and they come with a sample attached, which is the part worth reading.

Read that survey with its sample in view. Those 260 firms skew small, so the numbers describe the tier a local business buys from rather than the tier that runs a national brand. Multi-channel work with a named account manager, a strategist and in-house creative sits well above that band. Paid media work is often quoted as a share of ad spend with a monthly minimum underneath it, so ask for both halves of that formula. Whatever the total, it should break into three lines you can see: the agency fee, the media spend, and the software.

Some of what you are quoted is software, and it helps to know which licenses are the agency's cost of doing business and which are yours to own.

One rule sits underneath that table: you own the accounts holding your data, and the agency belongs on them as a manager. Your Google Ads history, analytics property, Search Console, Business Profile, pixel, audiences and email list are assets that took years to build up, and none of it moves with you when the account belongs to somebody else. Fixing that at signing costs one email. Fixing it at the exit costs the history.

One number is worth retiring: the claim, repeated on hundreds of pages, that the Small Business Administration says to spend 7% to 8% of revenue on marketing. It does not appear at any live SBA URL, and the sources that date it trace it to an article from 2013. Two current figures stand in its place, and they disagree in a useful way. Gartner asked 401 CMOs at mostly billion-dollar firms and got 7.8% of revenue; the CMO Survey asked 308 US marketing leaders and got 9.0%. In that same survey, marketing takes 9.6% of the total company budget, its lowest share since 2021. Both samples run far larger than a local business, so read them as a ceiling, not a rule.

Build the budget from your own math instead. At the 2026 average cost per lead of $66.69 across more than 13,000 search campaigns, a $2,000 monthly media budget buys roughly 30 leads, not 300, and 30 leads is not 30 customers. Run that through your close rate and your average customer value before agreeing to anything. If the math points at hiring somebody instead, that is a fair answer: we ran the numbers in agency versus in-house marketing, and the agency, freelancer and in-house guide prices the third option most owners forget.

The strongest red-flag list available was not written by an agency. Google publishes hiring guidance for search work, and it opens with a line worth memorizing.

The same page tells you to be careful if a company is secretive or will not explain what it plans to do. It says to avoid anyone pitching link-popularity schemes or bulk submission to thousands of search engines, and it notes that Google does not rate or endorse third-party SEO tools. On access, it says to grant only read access to Search Console at the start. A guarantee is a sales tactic aimed at buyers who have not read that page.

• A guaranteed ranking, a guaranteed lead count, or a guaranteed revenue figure.
• Accounts set up under the agency's ownership, or pushback when you ask to put admin access and data ownership into the agreement.
• A proprietary platform nobody will name. It is often a white-labeled product you could license directly.
• A monthly PDF of impressions, rankings and brand-awareness talk with no cost per lead anywhere in it.
• No written definition of a qualified lead, agreed before the media budget starts running.
• A deliverables list with no counts and no dates on it. That is a wish list, not a scope.

Google also publishes the questions it suggests you ask, and they are worth reading aloud in a first meeting.

• Can you show me examples of your previous work and success stories?
• Do you follow the Google Search Essentials?
• What is your experience in my industry, country or city?
• How long have you been in business?
• Will you share all changes and provide detailed reasoning?
• What results should I expect, and in what timeframe?

That last question is a trap worth setting. An honest answer names a range and what it assumes; a guarantee names a number.

Longer than the folklore claims. The 2025 tenure study from the ANA and the 4A's puts the average client-agency relationship at about seven years, more than double the 3.2-year average the same research found in 2016. The half-life depends on what you hired: media agencies average 3.7 years, full-service and integrated shops 7.3 years, and experiential agencies about ten. Independent agencies average 7.3 years against 5.8 years for holding-company agencies.

The most useful finding in that study is about reviews. The 60% of clients with no required review period average 8.1 years with their agency, while clients who review often run as low as 3.8 years, and the 40% who do require reviews spend an average of $408,500 per pitch. A small business will not spend $408,500 on a pitch. It spends three months of momentum on every restart instead, which is the same tax in a different currency. Review the work every quarter; re-shopping the whole relationship every year costs more than it returns.

The proposal in your inbox is still sitting there. The monthly number on it is the least informative thing on the page: read the deliverables list for counts and dates, ask who owns the accounts, ask what lands in week one, and ask what happens in the month something goes wrong. Those four answers will tell you more than the price does.