Marketing agencies charge a monthly fee that depends on what they run for you, how much ad spend they manage and how they price it, so the honest answer is a range, and you can narrow it to your own number before you talk to anyone.
That is unsatisfying if you wanted a figure to put in a spreadsheet. Still, the reason there is no single price is useful: the fee follows the work, and you control the work. Once you decide what you need done, the quotes you receive stop looking random.
Three things set the invoice
First, scope: running one ad channel is a smaller job than running ads, email, content and reporting together. Second, spend: an agency managing a large ad budget carries more risk and more optimization work than one managing a small test. Third, who does the work: a senior strategist's time costs more than a junior account coordinator's, and agencies differ widely in who actually touches your account.
A quote that does not tell you these things is not a price yet, it is a pitch. Ask for the scope in writing before you compare numbers.
The four ways agencies bill
| Pricing model | What you pay for | Watch for |
|---|---|---|
| Flat monthly retainer | A fixed scope of work each month | Vague scope that lets deliverables shrink quietly |
| Percentage of ad spend | A share of the budget the agency manages | The fee grows when you spend more, whether or not results do |
| Hourly or project-based | Time or a defined piece of work | Open-ended hours with no cap or review date |
| Performance-based | A fee tied to leads or sales | Disputes over what counts as a lead, and shortcuts that chase volume |
What a fair quote should itemize
Look for the channels covered, the reporting you will receive, who your day-to-day contact is, and what happens if you want to leave. Setup work, such as tracking and account structure, is sometimes billed separately from the monthly fee. That is reasonable if it is stated up front and surprising if it appears on the second invoice.
If you want a deeper line-by-line view of what small businesses typically spend across channels, our guide on the cost of marketing for small business breaks it out item by item.
Why so few people search this, and why the answer still matters
Across the whole cluster of related searches, only about 60 people a month ask this, spread over 36 distinct phrasings. The exact wording you used peaked at 50 searches a month in October 2025 and dipped to 20 in July 2026. That is a small crowd, which tells you something: most owners ask a neighbor, a peer group or a sales rep instead of a search box, and they often hear a number without the context behind it.
There is a hint of how valuable the topic is on the advertiser side. The highest top-of-page bid for these searches is $8.74 a click, so agencies are paying real money to be the first thing you see. Treat that as a reason to read the quotes you collect with a little skepticism, not as a reason to avoid them.
Work backwards from what a customer is worth
Instead of asking what an agency costs, ask what you can afford to pay for a new customer and still profit. Take your average sale, your margin and your close rate, and you can estimate a ceiling for total marketing spend, fees and ad budget together. If the fee alone would swallow most of that ceiling, the arrangement does not work at your size, no matter how good the agency is.
Our guide on setting a good advertising budget for small business walks through that math if you have not done it before.
Questions to ask before you sign
Ask who will log into your account each week and how many other clients they handle. Ask which numbers they report and whether you will own the ad accounts and the data. Ask for the shortest contract they offer and what a typical client sees in the first quarter. An agency that answers plainly, and admits what it cannot promise, is worth more than one with a lower number and fuzzier terms.
Your next step this week
Write down your customer value and the monthly total you could spend, list the one or two channels you actually want help with, and request quotes against that same written scope from two or three providers. If your ad account already exists, have someone independent look at it first, since a clean audit shows what is working before you pay anyone to change it. Hiring help is a sensible option when you lack the time or the know-how to run paid channels well, and a poor one when your tracking is broken or your offer is unclear.