How to lower Amazon ACoS without killing sales
Symptom: Amazon ad spend is running above your product margin
High ACoS usually comes from wasted spend on the wrong queries, not from bidding too high across the board. This workflow harvests proven converters into controlled campaigns, adds negatives, sets bids by match type against margin, and watches TACoS so cutting ACoS does not quietly erode organic rank. The goal is efficiency that holds, not a number chased into a sales collapse.
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- Accurate gross margin per product
- Recent search-term reports for your campaigns
- Organic rank visibility for key terms
- 1
Set the target ACoS from margin
Start by deriving each product's target ACoS from its real gross margin. Break-even ACoS equals the margin percentage, so a defensive campaign should run below it and a launch may run at or above it deliberately.
Without a margin-derived target, you are chasing an arbitrary number that may be too aggressive or too timid.
- 2
Harvest proven converters
Mine the search-term report for queries that convert and move them into exact-match manual campaigns where you control bids. This concentrates spend on terms that already work.
The discovery campaigns, automatic and broad, exist to find these winners, not to carry ongoing spend at scale.
- 3
Add negatives aggressively
From the same report, add irrelevant and non-converting queries as negatives on automatic and broad campaigns. This is the single biggest lever on wasted spend, since broad and auto campaigns bleed budget on queries that will never convert.
Make negative hygiene a weekly habit, not a one-off.
- 4
Set bids by match type
Bid exact-match proven terms up to their value, and keep broad and auto bids lower since they are for discovery. Reduce bids on terms whose ACoS sits above margin, and increase where there is profitable headroom.
The aim is to pay what each query is worth, not a flat bid across intent levels.
- 5
Watch TACoS as you cut
As ACoS improves, watch TACoS and organic rank. If TACoS starts climbing or organic rank slips, you may be cutting spend that was feeding the sales velocity behind your organic position.
Efficiency that quietly erodes organic rank is a false win, so judge the account on both metrics.
- 6
Iterate and hold the discipline
Lowering ACoS is not a one-time fix but an ongoing rhythm of harvesting, negating, and bid tuning. Review weekly, and re-derive target ACoS if margins or the product lifecycle change.
The accounts that hold low ACoS are the ones that keep the discipline, not the ones that slash bids once.
- Cutting bids across the board instead of removing wasted queries, which kills sales
- Chasing a target ACoS not grounded in margin
- Neglecting negatives, so broad and auto campaigns keep bleeding spend
- Ignoring TACoS, so ACoS falls while organic rank quietly erodes
- Treating it as a one-time fix rather than a weekly discipline
Common questions
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