Is a 50% ACoS good on Amazon?

Whether a 50% ACoS is good depends entirely on your product's margin. If your net profit before ads is 55%, a 50% ACoS leaves a 5% profit on ad sales, which is technically profitable but very thin. If your net margin before ads is 40%, a 50% ACoS means you are losing 10% on every ad-attributed sale. Calculate your own break-even ACoS first, then judge any ACoS figure against that number rather than against a general benchmark.

How do I know if my ACoS is too high?

Your ACoS is too high if it exceeds your break-even ACoS, meaning you are spending more on advertising than you are making in profit on those sales. Compare your current campaign ACoS against your break-even figure, which is your net margin before ad costs expressed as a percentage. Any ACoS above that level is loss-making per ad sale. If your ACoS is high but below break-even, it may still be acceptable depending on your campaign goal.

What is the difference between ACoS and TACoS on Amazon?

ACoS (Advertising Cost of Sales) measures ad spend as a percentage of ad-attributed revenue only, excluding organic sales. TACoS (Total Advertising Cost of Sales) measures ad spend as a percentage of your total revenue including both ad-attributed and organic sales. TACoS gives a broader view of how advertising spend relates to your overall business, while ACoS shows the efficiency of advertising in isolation. For mature products with strong organic sales, TACoS will be much lower than ACoS because the denominator is larger.

Can I improve my break-even ACoS without changing my price?

Yes. Break-even ACoS improves whenever your costs fall. Reducing your cost of goods through better supplier terms, switching to a more cost-efficient FBA packaging configuration, or reducing your storage fees by improving inventory turnover all lower the cost side of the break-even calculation. Each reduction in variable cost per unit increases the margin available for advertising spend, raising your break-even ACoS without any change to your selling price.

What is break-even ACoS on Amazon?

Break-even ACoS is the point at which your advertising spend exactly equals your profit on each sale, leaving you with neither a gain nor a loss from that ad spend. It is calculated from your product's net margin before ad costs and sets the ceiling above which advertising becomes unprofitable on a per-sale basis. Break-even ACoS represents the available margin per sale that can be absorbed by advertising before the sale becomes unprofitable. It is expressed as a percentage and calculated by subtracting all variable costs from your selling price and expressing the result as a percentage of the selling price. The formula: Break-even ACoS = (selling price minus COGS minus FBA fulfilment fee minus referral fee minus other variable costs per unit) divided by selling price, multiplied by 100. Variable costs to include are cost of goods, Amazon FBA fulfilment fee, referral fee (usually 8 to 15% of the selling price depending on category), storage costs and any other per-unit expenses such as packaging or prep. Consider a resistance band set listed at £29.99. Cost of goods: £6.50. FBA fulfilment fee: £3.20. Referral fee at 15%: £4.50. Packaging and prep: £0.80. Total variable cost per unit: £15.00. Net margin before ads: £29.99 minus £15.00 = £14.99. Break-even ACoS: £14.99 divided by £29.99 multiplied by 100 = 50%. This means any campaign returning an ACoS below 50% is generating profit from ad sales on this product. A campaign running at 30% ACoS is profitable: for every £100 of ad revenue, £30 goes to ads and £50 to variable costs, leaving £20 in profit. A campaign at 60% ACoS is losing money: for every £100 of ad revenue, £60 goes to ads and £50 goes to costs, a £10 loss per £100 of ad sales. Break-even ACoS is a ceiling, not a target. Setting your campaign target at exactly break-even means advertising produces zero profit on ad sales: you are spending all available margin on ads. Your target ACoS should sit below break-even by the profit you want to retain from each ad-attributed sale. If your break-even ACoS is 50% and you want to retain a 15% profit margin on ad sales, your target ACoS is 35%. For every £100 of ad revenue, £35 goes to ads, £50 to variable costs and £15 remains as profit. The gap between your target ACoS and your break-even ACoS is your advertising profit buffer. Running above break-even ACoS is sometimes a deliberate strategy rather than a sign of failure. During a product launch, running at or above break-even is common because the goal is sales rank improvement, review generation and keyword indexation rather than immediate profit from each ad sale. The long-term value of those outcomes can exceed the short-term cost of the advertising loss. The key discipline is knowing when above-break-even spend is intentional and when it is simply inefficient. Campaigns that have been running above break-even for months on a mature product with strong organic ranking are not generating a strategic benefit. Those campaigns need their keyword targeting restructured or their bids reduced.

Break-even ACoS is the maximum ACoS where your advertising neither profits nor loses money. Learn the formula and how to use it to set PPC targets.