Verify the Case Studies Before You Believe Them
Every agency pitch deck has a slide with a client logo next to a number: 340% more leads, 6x return on ad spend, doubled revenue in 90 days. None of that tells you anything on its own. Ask the agency for the client's name and permission to contact them directly. A legitimate shop usually says yes within a day or two. One that stalls, cites an NDA for every single case study, or only ever shows a cropped dashboard screenshot hasn't given you evidence. It's given you a claim dressed up as one.
Ask specifically what the case study measured. Leads and revenue aren't the same thing, and a campaign that generated leads at $4 each isn't automatically the same campaign that returned $4 in profit for every dollar spent. According to the Federal Trade Commission's guidance on truth in advertising, marketers are expected to have a reasonable basis for the claims they make and to keep the substantiation behind them on hand. A results claim an agency can't substantiate on request is a claim you should treat as marketing, not evidence.
A results claim an agency can't substantiate on request is a claim you should treat as marketing, not evidence.
The same skepticism applies to the testimonials an agency shows off during the pitch. It's the same pattern we track in fake reviews and testimonials: a quote with no name attached, or a name that can't be found anywhere else online, isn't verification. It's decoration.
AdvertisementRead the Fee Structure Line by Line
Agencies typically get paid one of three ways: a flat retainer, a percentage of ad spend, or a markup built into the media buy itself. None of these is dishonest by default. The problem shows up when the contract doesn't say which one applies, or says one thing and quietly does another. A 15% management fee on top of a $10,000 monthly ad budget comes to $1,500. A hidden 15% markup baked into the media buy can cost the same amount while making it look, on paper, like your whole budget went to ads.
Get the number in writing before you sign: what percentage goes to spend, what percentage goes to the agency, and whether there's a separate setup or strategy fee stacked on top. If an account manager can't answer that in one straight sentence, treat the hesitation itself as information.
| Model | How it works | What to ask |
|---|---|---|
| Flat retainer | Fixed monthly fee, separate from ad spend | What deliverables are included at this price? |
| Percentage of spend | Fee scales with your ad budget | What percentage, and is there a minimum? |
| Media markup | Fee is built into the cost of the ad buy | Can I see the raw platform cost versus what I'm billed? |
Check the Contract Terms That Actually Protect You
The cancellation clause tells you how confident an agency is in its own work. A 30-day, no-penalty exit is standard in this industry. A 12-month lock-in with an early termination fee worth several months of retainer suggests the agency expects clients to want out before results show up.
Ownership matters just as much. Ask, in writing, who keeps the ad accounts, the creative files, the email lists, and the tracking pixels if you part ways. Some agencies build campaigns inside their own master accounts specifically so a client can't leave with the account history intact. That's a structural way to make switching expensive, and it's worth asking about before you sign, not after you've already decided to go.
- Cancellation notice period is 30 days or less, with no exit penalty
- Contract states in writing who owns the ad accounts after termination
- Creative files and reporting history transfer to you on request
Ask Who Controls Your Reporting and Ad Accounts
A results report an agency builds itself isn't the same as read access to the actual ad platform. Google Ads, Meta Ads Manager, and most other platforms let an advertiser grant a partner limited access while keeping the account, and the raw numbers, under the client's own login. If an agency insists on sole account ownership and only ever shares a PDF summary once a month, you're seeing selected numbers, not the underlying data.
Ask for direct, read-only access to the ad platform from week one. A legitimate agency sets this up as routine practice. One that resists is asking you to trust its summary instead of letting you check the underlying work, which is the opposite of what you want from a vendor managing your budget. This is one of the clearest signs of agency and consultant red flags we see across reader tips.
Watch for Credential Inflation and Vague Expertise Claims
"Google Partner," "Certified Marketing Expert," and "Award-Winning Agency" appear on a huge share of agency websites, and some of these badges mean less than they sound like. Google's own Partner Badge, for instance, is earned by meeting ad-spend and staff-certification thresholds. That's a real credential, but it measures spend managed and tests passed, not campaign performance for any particular client. An agency can hold the badge and still deliver mediocre results for you specifically.
When someone calls themselves a marketing expert, ask one direct, specific question about your industry or your preferred ad platform and see how the answer holds up. A real specialist can usually go two or three questions deep before running out of specifics. Someone who repeats general marketing language back at you, without naming a platform feature, a benchmark, or a specific tactic, is probably newer to this than the pitch suggested. The same overselling shows up constantly in online course claims, where "expert" is used just as loosely.
Exhibit: Claim vs. Evidence
The Claim
"We're a certified team of growth experts with a proven track record."
What to Ask For
Which certifications, held by which named team members, verifiable on the issuing platform's own partner directory.
Common Questions From Readers
How much should I expect to pay a marketing agency?
It varies widely by scope and market. Small-business retainers commonly run from a few hundred dollars a month for a narrow, single-channel engagement up to five figures a month for full-service management across several platforms. Ask exactly what's included in the retainer, since two agencies quoting the same number can be offering very different amounts of actual work.
Is it a red flag if an agency won't guarantee results?
No, it's usually the opposite. No legitimate agency can guarantee a specific number of leads or a set return on ad spend, because outcomes depend on your market, your offer, and factors outside the agency's control. Be more cautious of an agency that guarantees a specific number than one that won't.
Should I hire a local agency or one that works remotely?
Location matters less than access and communication. A remote agency with transparent reporting and regular calls can easily outperform a local one with vague updates. Focus on the verification steps in this article rather than on geography.
What's the fastest way to check if an agency is legitimate?
Ask for one client reference you can contact directly, and request read-only access to your own ad accounts starting week one. Both are simple for a legitimate agency to fulfill, and both are commonly where a questionable agency starts making excuses.
The same due-diligence habit applies past the marketing agency itself. Plenty of small businesses hire an agency for strategy and ad spend, then hire a separate vendor for the physical side -- the direct mail pieces, event signage, or leave-behinds a campaign still needs. Vet that vendor the same way: ask for written per-unit pricing and turnaround time up front, and get it in writing before production starts. A commercial printer such as Duplicates Ink publishing its pricing and lead times plainly is the kind of transparency that should be the baseline for any vendor billing you, agency or otherwise.
The Bottom Line
Most agencies aren't scams. Most are mediocre or mismatched, not dishonest, and that's a different problem with a different fix. Still, the fastest way to protect your budget is the same lesson that runs through every category on this site: ask for the documentation before you pay, not after something goes wrong. If you're still working out how to choose a marketing agency, spend one hour verifying case studies, fee structure, and account ownership before your first call ends. That hour is cheaper than a 12-month contract with the wrong company. Browse more of our reporting in Red Flag Rants.