A Monthly Amazon Scorecard That Goes Beyond ACoS

A report can show a falling ACoS and still hide a business that is getting smaller. ACoS describes only the sales your ads got credit for, so it says nothing about the sales you did not get, the customers you did not reach, the stock you did not have, or the account problems quietly building up. A scorecard fixes this by putting a handful of measures on one page, every month, so you read the direction of the business rather than one number.

Why ACoS alone misleads

ACoS is ad spend divided by ad-attributed sales. It can improve for good reasons, such as sharper targeting. It can also improve because you cut spending on prospecting and let branded keywords, which convert easily and cost little, make up more of your spend. The percentage looks better while total sales stall. A single ratio can move up or down for opposite reasons, so a scorecard always pairs it with an absolute number: total sales.

ROAS, which is simply sales divided by spend, has the same weakness from the other direction. Both describe how efficiently ads turn spend into attributed sales. Neither says whether the business as a whole is healthier than it was last month, which is the question an owner or a brand manager actually needs answered.

The measures below come from different places in Seller Central and the Amazon Ads console. None needs special software. They need the same layout every month, so that a change in direction stands out.

The seven measures

Total sales is the anchor. Compare each month with the one before and with the same month last year, since seasonality otherwise passes for performance. A brand that always sells more in the fourth quarter has not improved just because November beat September.

TACoS divides ad spend by total sales instead of ad sales, which shows how heavily the business leans on advertising. In a hypothetical month with $6,000 of ad spend and $40,000 of total sales, TACoS is 15%. It is most useful beside the total sales line. A falling TACoS with rising total sales is good news. A falling TACoS because of a one-off sales spike tells you nothing.

Traffic and conversion by product explain why total sales moved. Sales are roughly sessions multiplied by conversion, so a fall in either one shows up in the total. Business Reports by child ASIN show sessions, the unit session percentage (a conversion measure) and the Buy Box percentage. Falling sessions point to visibility: rank, ad coverage, price or stock. Falling conversion points to the listing, the price, reviews or a new competitor. A falling Buy Box percentage points to availability or pricing.

Organic share is total sales minus ad-attributed sales, divided by total sales. It is an approximation, because ad sales are credited for a window after the click while total sales are counted by order date. The direction is what you want. A rising organic share suggests your ads and listing are building lasting rank. A falling one suggests you are renting sales.

New-to-brand metrics, on the ad types that report them, count customers who bought from you for the first time within a lookback window Amazon defines. An account with a great ACoS and very few new-to-brand customers may mostly be harvesting people who already know you.

For inventory, track in-stock days on your top products, months of cover, and the share of units sitting in older age bands, plus any inventory score Amazon reports for your account. A sales dip in a month when the product was out of stock for part of it is an availability problem, not a marketing one. For account health, record your status and the number of open issues each month. A rising count is an early warning even when sales look fine.

Reading the numbers together

The measures are most useful in combination. Read ACoS or TACoS against total sales and you land in one of four situations.

Warning signs of a flattering report

Reports can flatter without anyone lying. A branded campaign can pull the average ACoS down. A date range can start the day after a bad week. A percentage gain can come from a tiny base. Ad-attributed sales usually count the sale before returns, and an average across the account can hide one product that is collapsing. Look for the habits below.

Add a profit row if you can. Sales growth that is bought at a loss is not growth, and a scorecard without a profit line can make a worsening business look busy. Use contribution after fees, ad spend and returns, even if the figure is rough.

The last item matters most. If whoever prepared the report cannot explain what moved a number, treat the number as unproven until they can.

Running the scorecard each month

Build it as a spreadsheet: one column per month, one row per measure, and a notes row for what changed in the month, such as a price move, a promotion, a stock-out or a listing edit. Review it in one sitting on the same day each month and read it in the order above: total sales, TACoS, organic share, new-to-brand customers, product-level traffic and conversion, inventory, then account health.

Decide in advance what counts as a signal, so one noisy month does not set off an alarm. A useful rule is to investigate when a measure moves the wrong way two months in a row, or when a single move exceeds a limit you set yourself. A scorecard shows what changed, not why. Its job is to tell you where to look next.

Write one sentence per row. If you cannot say why a number moved, that row is your next investigation. Keep the same definitions every month, because changing how you count is the quickest way to make a trend meaningless.

Share the scorecard with everyone who touches the account: whoever runs ads, whoever handles inventory and whoever owns the budget. The same page then becomes the shared record of what happened, instead of three people holding three versions of the month.

Where to start

• Create the sheet with the seven measures and fill in the last three months.
• Add a notes row for promotions, price changes, stock-outs and listing edits.
• Split ad data into branded and non-branded.
• Add the same-month-last-year comparison wherever you have the data.
• Choose a review day each month and keep it.
• Ask for total sales and TACoS in any report someone else prepares for you.