What is a good TACoS on Amazon? How to set your own ceiling

“What is a good TACoS?” is one of the questions we hear most from founders, usually followed by “and what’s everyone else running at?” The second question is the less useful one. Two brands in the same category can both be well run at TACoS figures several points apart, because they have different margins, are at different stages and get different shares of their sales without an ad. This guide shows how to set a TACoS ceiling for your own brand and how to read the trend against it.

TACoS is ad spend divided by total sales, including sales that came without an ad click²³. If you want the full definitions of ACoS, ROAS and TACoS and the profit bridge between them, start with our guide to break-even ACoS. Here we use one line from it:

ACoS vs TACoS

ACoS and TACoS share a numerator, your ad spend, and differ only in what they divide it by. That one difference changes the question each answers.

Amazon defines ACoS as ad spend divided by attributed sales¹, and a sale only counts as attributed when the shopper clicked an ad and bought within the attribution window, seven days for sellers’ sponsored ads⁵. TACoS has no single figure in either console; Amazon’s API documentation builds it by combining advertising data with Selling Partner sales data³.

Because total sales are always at least as large as ad-attributed sales, TACoS is never higher than ACoS. The gap between them is your organic share, which the identity further down makes exact. Use ACoS week to week to run the campaigns, and TACoS month to month to decide how much the account can afford to spend. If you only track one, track TACoS, because it is the one that leads to profit.

Why there is no universal good TACoS

Four things decide what TACoS your brand can carry, and none of them is the same for any two brands:

• Margin. A product that keeps 40p of every £1 after costs and fees can spend far more on advertising than one that keeps 15p, and still make more profit.
• Lifecycle stage. A new product with no reviews and no rank has to buy its early sales. A product that ranks on page one for its main terms needs ads mostly to hold its place.
• Category. Click prices differ widely between categories, and ACoS rises with the cost of a click. Amazon’s own ACoS guide makes the link to margin directly: to stay profitable, ACoS has to stay below your profit margin¹.
• Organic share. The more of your sales that arrive without an ad, the lower TACoS falls for the same ad efficiency.

You will find “good TACoS” ranges published by agencies and software tools. They tend to disagree with each other, many are based on the US store, and they rarely say which categories, margins, periods or accounts sit behind them. The earlier version of this article published its own bands by revenue stage; they came from experience, not a study, so we have taken them out. We don’t cite any benchmark here. Your own margin and your own trend are better guides.

Set your ceiling from your margin

Start with the margin before advertising for each product group: the share of the selling price left after cost of goods, Amazon’s fees, fulfilment and VAT. Our guide to Amazon selling fees in the UK lists every fee that comes out of the price, and the FBA calculator for the UK works out the margin per unit for you. Measure total sales on the same basis as the margin; Amazon Ads reports ad spend and ad sales without VAT, so if your sales figure includes VAT, your margin should be a share of the VAT-inclusive price too. The break-even ACoS guide walks through that calculation line by line. Then decide what share of sales you want left as profit after advertising. The difference is your ceiling.

One account-wide target would be wrong for all three. At 18% across the board, the hero products would be held back from growth they could afford, and the add-ons would lose money on every advertised pound.

Now look at what each point of TACoS is worth. Take the core range selling £80,000 a month at a 30% margin:

Each point of TACoS costs £800 a month here, as long as sales stay the same. That is the test for any extra spend: does it bring in enough extra sales to be worth more than £800 a month per point? That profit counts again at exit, because buyers pay a multiple of yearly profit, as our guide to selling an Amazon business explains. The table assumes sales don’t change, which in real life they do. That is exactly why the trend matters, and we come to it below.

Recalculate the ceiling whenever a price, a cost or an Amazon fee changes. Amazon changed several UK referral and FBA fees between December 2025 and January 2026, for example cutting the Home Products referral fee from 15% to 8% on items up to £20⁸. A change like that moves the margin, and so the ceiling.

Where each lifecycle stage should sit under the ceiling

The ceiling tells you the most you can spend. Your stage tells you how much of it to use. This is how we set targets in the accounts we manage; it is our practice, not an Amazon rule.

Two rules keep this honest. First, anything above the ceiling is an investment, so it needs a budget and an end date. Without them, a launch quietly becomes the permanent state of the account. Second, the stage belongs to the product, not the brand. Most catalogues have products in all four stages at once, which is another reason one account-wide target doesn’t work.

How category and organic share move TACoS

A short identity explains why two well-run brands can sit so far apart:

Category sets much of the first term, because expensive clicks push ACoS up. Listing strength and organic rank set the second. Put them together:

The same brand can move from the top-left cell to the bottom-right without changing its ad budget much at all, by converting better and ranking higher. That is why the fastest way to lower TACoS is often not in the ad console. A listing that converts better lowers ACoS and earns more organic sales at the same time.

What “organic” really means

Be careful with the organic figure. For sellers, Amazon credits a sale to an ad when the shopper clicks and buys within seven days, on a last-click basis, and the credited sale can be any product you sell, not only the one advertised⁵. So “organic” really means “not credited to an ad click in the last seven days”. Some of it was helped by ads the shopper saw but didn’t click, and some sales credited to ads would have happened anyway. Use organic share as a trend, not as an exact measure of what ads did.

For a view by search term, brand representatives can use the Search Query Performance dashboard in Brand Analytics. It shows query volume, impressions, clicks, add-to-basket and purchases for up to 1,000 queries associated with your brand, covering organic and Sponsored Products results from the search page⁷. If your share of purchases on your main terms is rising, organic rank is usually doing some of the work.

Reading the trend: when rising TACoS is fine and when it isn’t

A single month’s TACoS tells you little. The direction of TACoS next to the direction of total and organic sales tells you a lot.

TACOS reveals whether your total sales (organic and paid) are growing in relation to your ad spend.

Here are two versions of the same three months, with illustrative figures:

In both versions TACoS rose and ad-attributed sales grew. In the healthy one, organic sales rose by 25% too: the extra spend is building rank. In the warning one, organic sales fell by 22%. Ads are now buying sales the listing used to earn for free, and total sales barely moved.

When you see the warning pattern, look for the cause before touching budgets. The usual suspects in the accounts we audit are a suppressed or broken listing somewhere in the catalogue, a lost Buy Box, a drop in rating or review flow, a competitor with a stronger offer or better images, a stock-out that cost rank, or seasonality that wasn’t planned for. Cutting spend first can make things worse, because if ads were holding the rank, organic sales can fall further once they stop. Amazon Ads makes a similar point about peak season: a spike in ACoS on its own is not a reason to pause campaigns, and TACoS is the better check⁴.

How to track TACoS every month

1. Fix your product groups. Group products with similar margins and the same stage. Five to ten groups is enough for most brands.
2. Set each group’s ceiling from its margin before advertising and your target profit, and write down its stage and, for launches, the budget and end date.
3. Pull the same four figures each month: ad spend by product from Amazon Ads; Ordered Product Sales by child ASIN from Business Reports⁶; ad-attributed sales by product; and sessions.
4. Calculate for each group: TACoS, organic share (1 − ad-attributed sales ÷ total sales) and profit after advertising, using total sales × (margin − TACoS).
5. Plot 12 months, not one. Compare each group’s TACoS with its ceiling and read it against the trend table above.
6. Decide once a month: which groups get more budget, which launches have reached their end date, and which warning patterns need a listing fix rather than a bid change.

The Profit X-Ray works out TACoS and profit after advertising from four monthly figures, which is a quick way to see where the account sits before you build the full monthly view.

A good TACoS isn’t a number someone else publishes. It is one that stays under the ceiling your own margin sets, fits the stage each product is in, and falls over time as more of your sales arrive without an ad.