What is TACoS (Total Advertising Cost of Sale)?
Reviewed by CA Apurav GargLast reviewed
In short
TACoS is advertising spend divided by total sales of the product or brand, organic and ad-driven together, rather than by ad-attributed sales alone as ACoS is.
Want help applying this to your own accounts?
We handle bookkeeping, GST and TDS for D2C and marketplace sellers, and can walk you through how this works in your business.
The formula
TACoS = ad spend ÷ total sales of the product or brand in the same period
ACoS, which most marketplace ad consoles show, divides the same ad spend by ad-attributed sales only. ACoS judges the campaign; TACoS judges how much of the whole business is being bought with advertising.
How to read it
- TACoS falling while sales grow: ads are building organic rank and repeat purchase. Advertising is becoming a smaller share of the business.
- TACoS rising while total sales stay flat: ads are taking credit for sales the product would have made anyway, often by bidding on the brand's own name. This is called cannibalisation.
- TACoS rising with total sales: the brand is buying growth. That can be the plan, for a launch or a sale event, but it needs a contribution margin wide enough to pay for it.
Measure it on what you actually receive
On a marketplace, TACoS is usually worked out on sales at the selling price, including GST. What the brand keeps is lower: GST, commission and fees, shipping and returns come out first.
On quick commerce, many brands sell to the platform on purchase orders at a discount to MRP, while the ad console reports sales at MRP. Dividing ad spend by sales at MRP makes TACoS look lower than it is. Working it out on the brand's net realisation (what the platform pays for the units it actually takes) gives a truer figure, and that is what the Quick-Commerce Ad Spend calculator does.
What it does not tell you
TACoS does not show whether the advertising is profitable. Compare ad spend with the contribution the extra sales bring in, after product cost, fees, shipping and returns. A low TACoS on a thin-margin product can still lose money; a higher TACoS on a high-margin product may be fine.
Example in rupees
A brand's sales of one product on a marketplace in a month:
| Figure | Amount |
|---|---|
| Ad spend | ₹1,00,000 |
| Sales attributed to ads | ₹4,00,000 |
| Organic sales (no ad click) | ₹6,00,000 |
| Total sales | ₹10,00,000 |
| Measure | Working | Result |
|---|---|---|
| ACoS | ₹1,00,000 ÷ ₹4,00,000 | 25% |
| ROAS | ₹4,00,000 ÷ ₹1,00,000 | 4.0 times |
| TACoS | ₹1,00,000 ÷ ₹10,00,000 | 10% |
Next month the brand spends the same ₹1,00,000 and total sales rise to ₹12,50,000, with ad-attributed sales unchanged. ACoS is still 25%, but TACoS falls to 8%: the ads are lifting organic sales too. If total sales had stayed at ₹10,00,000 while ad sales rose, the ads would only be taking credit for sales that would have happened anyway. The figures are illustrative.
Related terms
Work it out for your business
Want help applying this to your own accounts?
We handle bookkeeping, GST and TDS for D2C and marketplace sellers, and can walk you through how this works in your business.
General information only, not professional advice. Rules and rates change — check the official source before you act.