The Amazon PPC agency vs in house decision comes down to one test: hire out when you lack the time, skill or tooling to run ads profitably at your spend level. Here is the true cost of each, with a scorecard you can actually decide on.
Agency and Pricing
The Amazon PPC agency vs in house decision comes down to one test. Hire an agency when you lack the time, the specialist skill or the tooling to run Amazon ads profitably at your spend level. Keep it in house when you have a trained specialist and enough ad volume to keep them busy and paid for by results. For most brands below a mid sized budget, a good agency is both cheaper and faster than a competent full time hire, because the true cost of in house is far more than a salary.
We are on one side of this question, obviously, so this article is written to be useful even where the answer is not us. We manage $112M across 200+ brands and 16 marketplaces, and we have told brands to keep it in house often enough to know when that is the right call.
What is on this page
The one test that settles most cases
Three questions. Do you have somebody who can give this several hours a week, every week, without it being the thing that slips when the warehouse catches fire? Do they know Amazon advertising specifically, rather than Google or Meta? Do you have the reporting and tooling to see what is actually happening?
Three yes answers and in house is likely right. Any no and you are choosing between paying an agency and accepting an account that drifts, which is a real option but should be chosen deliberately rather than by default.
The true cost of in house
The headline salary is the part everybody plans for. The rest arrives anyway: recruitment fees or the time cost of hiring, software and data tools, training and conference budget to keep the skill current, and cover for holiday and sickness in a role where a fortnight of inattention costs real money.
Then there is the part that never appears on a budget line at all: the two to four months before a new hire is properly effective. During that period you are paying full cost for partial output, and if they came from a different advertising platform, the ramp is longer.
Amazon PPC agency vs in house, scored honestly
Agency wins on cost at small and mid spend, because you rent a share of a specialist rather than employing a whole one.
In house wins on cost at large spend, where a percentage or tiered fee eventually exceeds a salary and the volume justifies a dedicated person.
Agency wins on speed, because the systems, the templates and the mistakes already exist. Ours are described in what an Amazon PPC agency costs.
In house wins on brand knowledge, which matters more than people expect for seasonality, product roadmap and margin nuance.
Agency wins on tooling, since the same tools cost the same whether they serve one account or forty.
In house wins on focus, when the role is genuinely full time rather than a shared responsibility.
The true comparison is not fee against salary. It is fee against salary plus tools plus training plus cover plus the four months before anything improves.
Not sure which side of this you fall on?
Send us the reports. If the honest answer is keep it in house, we will tell you that, free.
Speed, and why it decides more than cost
An agency with existing processes is usually optimised inside two to four weeks: search term waste cut, negatives applied, placements read, structure tidied. A new hire, however capable, needs two to four months to reach the same point, because they are learning your catalogue, your margins and your history at the same time as the account.
Four months of drift on a $20,000 monthly budget is a large number, and it does not appear anywhere in the salary comparison. That gap is usually the single strongest argument for buying rather than building, and it shrinks to nothing once you already have a trained person in place.
What the first weeks should look like either way is not a mystery. Waste cut first, then placements, then careful bid work, in the order set out in cutting ACOS without losing rank.
Tooling, and the part nobody mentions
Running Amazon advertising well needs more than Seller Central. You need bulk file handling for anything above a handful of campaigns, keyword and competitor data, reporting that joins advertising figures to total sales, and somewhere to keep a record of what changed and when.
Bought individually for one brand, that stack is a real monthly cost and it usually arrives after the hire, when the new person explains what they need to do the job properly. Bought by an agency across many accounts, the same tools cost the same and the per account share is small. That difference is not a small line item, and it rarely appears in the salary comparison anybody actually runs.
There is a skills version of the same point. An agency sees patterns across dozens of accounts and categories, so a tactic that works somewhere else reaches you in weeks. One person working on one account sees one account, which is why in house teams tend to be strong on brand nuance and slower on platform change.
Key person risk, the cost nobody budgets
When advertising lives in one person’s head, their notice period is also your continuity plan. The campaign structure made sense to them. The reasoning behind the negative list was never written down. The account history is in their memory rather than in a document.
You can manage this: insist on written process, quarterly documentation of structure and reasoning, and shared access to everything. Almost nobody does, because it is the sort of task that never becomes urgent until the week after somebody resigns.
An agency has the same risk internally and absorbs it differently, because more than one person knows the account and the systems survive individuals. Ask any agency you are considering who the second person on your account is. If the answer is vague, that is a real red flag.
The hybrid that works
The split we see working most often puts advertising with an agency and keeps listings, stock, pricing and merchandising internal. The skills genuinely differ, and the internal side holds the commercial decisions that should never be outsourced.
It also puts the two halves in productive tension. The agency can say plainly that a listing is not converting and needs work, which lands better than the same message from a colleague. And the internal team can push back on advertising decisions with commercial context the agency does not have.
What it needs to work is shared numbers. Both sides looking at total sales, spend, ACOS and total advertising cost of sale together, monthly, in the format described in ACOS vs TACOS. Without that, each half optimises its own metric and the business ends up worse than either intended.
Want the comparison run against your own numbers?
Send the reports and your spend level. We will show the maths both ways, free.
How to decide this week
Work out your real in house cost. Salary plus roughly sixty percent for everything else, plus four months of partial output. Compare that to a real agency quote at your spend level, not a guess.
Be honest about the hours. Amazon advertising done properly takes several hours a week, every week. If nobody internally has that consistently, in house is a plan on paper.
Look at what has actually happened. Six months of total sales, spend and both cost ratios. If total sales are flat while spend rises, the current arrangement is not working, whoever is running it.
Decide what you keep either way. Brand, pricing, stock and listing ownership stay with you regardless. Anybody who wants those decisions is not offering a service, they are offering to run your business.
And if the honest answer is that your spend is too small for either option, that is worth knowing too. Learn the fundamentals, run it yourself for a few months, and revisit when the numbers justify it. The starting point for that is Amazon PPC explained.
Get a straight answer, including if it is not us
Twenty minutes on a call. We will tell you what we would do and whether it is worth paying for.
Frequently asked questions
For most brands below a mid sized ad budget, yes. The true cost of in house is salary plus recruitment, tools, training, holiday cover and the risk of the person leaving, which together run far above the headline salary. An agency spreads specialist skill and tooling across many accounts.
When the spend is large enough that a full salary is justified by results and there is enough volume to keep a specialist genuinely busy. Below that, a dedicated hire spends part of the week on Amazon and the rest doing other things, which is where accounts drift.
Two to four months for someone competent to get properly up to speed on your catalogue, margins and history, and longer if they are learning Amazon advertising itself rather than just your account. An agency with existing systems is usually optimised inside two to four weeks.
The risk that everything about your advertising lives in one person’s head. When they leave, the structure, the reasoning and the history often leave with them, and the replacement starts again. It is the most underestimated cost of running in house.
Yes, and plenty of brands do. A common split is an agency running the advertising while somebody internal owns listings, stock and merchandising. That works well because those two jobs need different skills and both affect the same numbers.
Brand decisions, pricing, stock planning and listing content ownership. Those are commercial choices that need to sit with the business, and no agency should be making them without you.
Look at total sales, ad spend, ACOS and total advertising cost of sale together over six months. If total sales are flat while spend rises, something is wrong regardless of who is running it, and the answer is usually process rather than personnel.
Send the right reports. Get a straight answer back.
We read the account properly and write back with where the money is going, what it is buying, and the three things we would change first. You keep it either way.
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