Flat fee, or a percentage of ad spend?
A flat fee is a fixed monthly retainer that does not move when your budget does. A percentage of ad spend is a fee calculated as a share of what you hand the ad platforms, so the agency's invoice rises every time your budget does. The models cost the same at one specific budget and diverge in both directions from there. The real difference is not price, it is what each one pays the agency to recommend.
The two models, stated plainly
A flat monthly retainer is one number. You pay it whether the ad budget is $5,000 or $50,000, and the scope is what the contract says it is. Kova charges this way: $1,497, $2,497 or $3,497 a month, published, with ad spend billed separately to your own card.
A percentage of ad spend is a fee derived from your media budget. Raise the budget and the fee rises with it, without anything else in the engagement changing. Some agencies blend the two: a floor retainer, then a percentage above a spend threshold.
Two other models exist and are worth naming so the comparison is complete. Hourly or project billing suits a defined piece of work with an end date, and rarely suits ongoing media management. Revenue share ties the fee to tracked sales, which sounds aligned and in practice makes the agency the referee of its own scoreboard, since it also owns the attribution setup.
What a percentage does to the incentive
Under percentage pricing, the fastest legitimate way for the agency to increase its own revenue is to persuade you to spend more. That is not an accusation of bad faith. It is the arithmetic of the contract, and it applies to honest operators as much as to anybody else.
The problem is that the correct advice is very often the opposite. Accounts hit a point where the next dollar buys a worse customer than the last one — frequency climbs, the audience saturates, and the incremental return falls below the point where spending more makes you money. Telling a client to hold budget flat, or cut it, is exactly the moment a percentage-priced agency has to argue itself into a smaller invoice.
A flat fee removes that particular conflict. It does not make the advice correct, and it introduces a conflict of its own, covered below. It just means the recommendation to raise or lower budget costs the agency nothing either way.
The honest case for percentage pricing
Percentage pricing is not indefensible, and an argument that ignores its merits is not worth much. Managing a $200,000 monthly budget genuinely is more work than managing $10,000: more campaigns, more creative, more variance, and more expensive mistakes. A fee that scales with budget tracks that workload better than a single fixed number does.
It also lowers the entry cost for a small advertiser. At a small budget a percentage fee can be a fraction of any serious flat retainer, which is why the model is common among agencies serving many small accounts at once.
The question to ask is not which model is virtuous. It is which one prices your specific budget correctly, and what each one pays your agency to tell you.
The arithmetic, at your numbers
This is division, not a claim about anybody's results. Take the flat retainer you have been quoted and divide it by the percentage rate you have been quoted. The answer is the monthly ad budget at which the two cost exactly the same.
Against Kova's middle tier at $2,497 a month, a 15% rate breaks even at a budget of about $16,600 a month. Below that budget the percentage is cheaper. Above it the flat fee is, and the gap widens every month you scale. At $40,000 a month the same 15% is $6,000 against a flat $2,497 — for management work that has not changed in kind.
Run it at your own numbers before the call, because the answer flips depending on where you actually are. Under roughly $10,000 a month in spend, a percentage deal is often genuinely the cheaper arrangement, and an agency telling you otherwise is selling rather than advising.
The conflict a flat fee introduces
A fixed fee pays the same whether the account gets forty hours or four. The incentive it creates is toward doing less, and the way agencies act on it is usually not neglect but dilution: the senior person who sold the work moves to the next pitch and a junior inherits the account.
What blunts that is scope written down and a named person attached to it. At Kova the person on the sales call is the person who builds the ad accounts, the tracking and the reports, because there is only one person. That is a structural fact about a one-operator firm, not a service promise — and it cuts both ways, since one person has a ceiling a twenty-person agency does not.
The contract terms that matter more than the rate
Pricing model is the question most buyers ask. These are the ones that decide what happens when the relationship ends, and they are worth more than a point or two on the fee.
Who owns the ad account. If the agency runs your campaigns inside its own business manager, you leave with nothing: no spend history, no learning phase, no audiences. Insist the account is opened in your name, with the agency granted access to it.
Who owns the pixel and the conversion data. Same test. A pixel on the agency's asset takes years of purchase history with it when you go.
Who owns the creative. Ask whether you receive working files or only exported ads, and whether usage survives the engagement.
What the minimum term is, and what happens after it. Kova's is three months, then month to month with 30 days notice. A twelve-month lock on an untested relationship is a different kind of product.
Whether ad spend is marked up. Ad spend should go to the platforms on your own card at cost. If it routes through the agency, ask in writing what margin is taken.
What is actually delivered each month. A rate is not a scope. Get the deliverables enumerated.
How Kova charges, and where it does not fit
Kova charges a flat monthly retainer and never a percentage of ad spend: $1,497, $2,497 and $3,497, published on the pricing page rather than quoted per prospect. Ad spend is billed separately, directly to your own card, at cost. The minimum term is three months, then month to month with 30 days notice.
Where that is the wrong fit: if you are spending under about $10,000 a month, a percentage arrangement will usually cost you less, and Kova will say so on the call rather than sell around it. The flat model earns its keep as budget scales, which is also the point at which percentage pricing starts working against the advice you need.
Straight answers
Divide the flat retainer by the percentage rate and you get the monthly ad budget where they cost the same. Below that budget the percentage is cheaper; above it the flat fee is. Against $2,497 a month at a 15% rate, that crossover is a budget of roughly $16,600.
It scales the fee with the size of the account, which tracks workload, and it lowers the entry price for small advertisers. It also means the agency's revenue rises when your budget does, which is a conflict at exactly the moment an account should stop scaling.
No. Kova charges a flat monthly retainer — $1,497, $2,497 or $3,497 — and ad spend is billed separately, directly to your own card, with no markup.
The client. The account should be opened in your business's name and the agency granted access to it. An account owned by the agency means the spend history, the conversion data and the audiences stay behind when the relationship ends.
It varies from month-to-month to twelve months. Kova's is three months, then month to month with 30 days notice. The first weeks go into instrumentation and audit before any campaign decision is trustworthy, which is what a short minimum is for.
It sounds the most aligned and carries the sharpest conflict, because the agency that gets paid on tracked revenue usually also owns the tracking setup. If you use it, have attribution built or audited by somebody who is not paid on its output.
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