What's a Good TACoS on Amazon? (With the Math)

What TACoS Actually Measures

TACoS stands for Total Advertising Cost of Sale. It divides your total ad spend by your total sales — ad-attributed sales plus organic sales — over the same period. The formula: TACoS = Total Ad Spend ÷ (Ad Sales + Organic Sales) × 100.

That's the whole difference from ACoS, which only counts sales that ads directly drove. TACoS asks a bigger question: across everything you sold this month, how much of it did advertising cost you? A campaign can post a rough ACoS and still be doing its job if it's pulling organic sales up behind it — TACoS is the metric that shows that.

What Is a Good TACoS on Amazon?

Most practitioners treat 5%–15% as a workable range, with 6%–10% considered strong for a seller with an established catalog. Below 5% and you're probably under-advertising — leaving organic rank on the table. Above 20% for any length of time, on a mature listing, usually means ads are propping up sales that aren't sticking organically.

But that range assumes a healthy, established product. It doesn't hold for every situation:

• New launches. A TACoS of 25% or higher in the first weeks is normal — you're paying for visibility a listing hasn't earned yet.
• Low-margin, high-frequency categories. Consumables and low-price items often run 15%–20% because unit economics need volume, and volume needs constant visibility.
• High-margin or strongly branded products. These can sit at 5%–10% because a chunk of demand is already branded search that ads barely have to touch.

So the honest answer to "what's a good TACoS" only exists once you know the product's age, category, and margin. A flat 8% target applied to every ASIN in a catalog is a mistake, not a strategy.

A Worked Example: Turning the Formula Into a Real Number

Take a product doing $40,000 in total monthly sales, of which $18,000 came from ads and $22,000 came organically. Ad spend for the month was $4,000.

TACoS = $4,000 ÷ $40,000 × 100 = 10%. That's in the healthy range.

Now look at ACoS on the same numbers: $4,000 ÷ $18,000 × 100 = 22.2%. On ACoS alone, this campaign looks expensive. On TACoS, it looks fine — because more than half the total sales came organically, and the ad spend is a small share of the whole. This is the case where TACoS tells the truth and ACoS alone would push someone to cut a campaign that's actually working.

Run the same $4,000 ad spend against a product with no organic sales yet — say $4,000 in ad sales and $0 organic — and TACoS is 100%. Same spend, same click behavior, completely different story. The number only means something next to the sales it's dividing into.

When Your TACoS Number Doesn't Match the Benchmark

If your TACoS looks wrong — too high, too low, or moving in a direction you can't explain — check these before touching a bid:

• Window mismatch. A 7-day TACoS during a launch and a 90-day TACoS on a mature ASIN measure different things. Compare like periods.
• Organic sales misattribution. If organic sales come from a different report than ad sales, double-counted or missing days will move TACoS without anything real changing.
• Seasonality. A spike two weeks before a known demand event isn't a trend, it's a calendar.

If the number is genuinely bad — TACoS climbing month over month on a listing that isn't new — the fix isn't to slash budget on the loudest campaign. It's to find which part of the funnel is leaking: are impressions up but conversion down, is a competitor now winning your branded search, has a price change moved your organic rank. Whatever the fix, it should carry the same three things before it runs: the evidence behind it, a measurement plan, and a rollback trigger. Cutting spend without that is how a bad TACoS reading turns into a bad sales month.

The Mistake Most Sellers Make With TACoS

The most common mistake is treating a single TACoS reading as a verdict instead of a trend. A 22% TACoS in week two of a launch and a 22% TACoS in month eight mean completely different things — the first is expected, the second is a warning.

The second mistake, and one we've made ourselves managing launches, is panicking on the way up. A brand-new ASIN with rising ad spend and no organic sales yet will show a TACoS that looks alarming next to a mature catalog average. Pulling budget at that point can stall the exact ranking climb the spend was buying. The better move is to set the expectation before launch — what TACoS is normal for week one through week six — so a number that looks bad on a dashboard doesn't trigger a decision that undoes the plan.

Where Dr. PPC Fits

Dr. PPC reads TACoS, ACoS, and organic trend together per ASIN rather than as one catalog-wide number, and any change it proposes — a bid cut, a budget shift, a new campaign — carries the evidence behind it, a measurement plan, and a rollback trigger, so a launch-stage TACoS spike doesn't get treated the same as a mature listing sliding the wrong way. It's $300 a month plus 3% of ad spend, capped, with the first 30 days free, and Orbit — the analytics suite with the trackers most sellers pay separately for — is included at no extra cost. Whether or not that's the right setup for a given seller, knowing what TACoS should look like at each stage is the part that matters regardless of who's managing the account.