Key takeaways: TACoS falls when organic sales grow faster than ad spend, not when you cut ads. The method is to win organic rank on a short list of terms with paid support, then taper that support in steps while watching the organic share of orders. Do it per ASIN, and report launches separately so they do not hide the trend.
What TACoS is telling you
Total advertising cost of sales is ad spend divided by total sales, paid and organic together. A TACoS of 12% means twelve cents of every dollar the ASIN earns went to advertising. When TACoS rises while ACoS holds, your organic sales are shrinking relative to paid, which usually means rank is slipping or paid is carrying growth the organic side has not caught up with. When TACoS falls while sales hold or grow, the ads are doing the job they should: buying rank that then produces sales you do not pay for.
The fastest way to lower TACoS is to switch the ads off. It is also the fastest way to lose the organic rank the ads were holding, so within a month total sales fall and TACoS goes back up. The real target is a falling share of ad cost with revenue intact.
Start with the paid-to-organic split per ASIN
Pull 30 days of ad-attributed orders from the advertising reports and total orders from Business Reports, by child ASIN. Organic orders are the difference. Sort by organic share. You will usually find three groups:
- Mature ASINs with 60% or more organic share. These can carry a lower ACoS target and a tighter budget. Paid support here is about defense, not growth.
- Mid-stage ASINs at 30 to 60% organic. These are where TACoS work pays off most. Rank is within reach on core terms but has not been locked in.
- Launches and low-organic ASINs under 30%. Paid is doing almost everything. Judge them on the launch plan, and report them separately so they do not drag the account-level number.
Win the terms that produce organic sales
Organic rank is earned term by term. For each mid-stage ASIN, choose three to five keywords where you convert well, where you already rank on page one or two, and where the search volume justifies the effort. Search Query Performance shows your click share and purchase share per query; the terms where purchase share is higher than click share are the ones where a better position would pay off most.
Support those terms with a dedicated exact-match campaign each, a top-of-search placement modifier and a bid set for rank rather than ACoS. Accept a higher ACoS on these campaigns for four to six weeks. The organic orders that arrive as rank climbs are what lower TACoS, and they will not show in the campaign's own ACoS.
Taper, do not cut
Read this flowchart as text
- Target terms ranked top 5 for 2+ weeks
- Reduce top-of-search modifier by 10-15%
- Hold 1 week, read organic orders and rank on the term
- Rank held and organic share up or flat?
- Restore the last step, hold 2 weeks
- TACoS down with total sales flat or growing
Once a term has held a top-five organic position for two weeks or more, begin reducing paid support in small steps: the placement modifier first, then the bid, each by 10 to 15% with a week between steps. After each step, check two things: the organic position on the term and the organic share of the ASIN's orders. If both hold, take the next step. If either slips, restore the last step and hold for two weeks before trying again. The floor is not zero. Most competitive terms need some paid presence to hold rank, and the taper finds the level where the ad cost is lowest for the rank you keep.
The levers beyond bids
Conversion rate lowers TACoS twice: it makes every paid click cheaper per order, and it lifts organic rank because Amazon rewards listings that convert. A main image test, a better price position or a stronger review profile can move TACoS more than a month of bid work. Branded search matters too. Every shopper who searches your brand name and buys is an organic order at near-zero ad cost, which is why Brand Store traffic, A+ Content and off-Amazon awareness show up in TACoS over time.
Reporting it properly
Report TACoS by ASIN group, not just at account level. A healthy account launching two new products will show rising TACoS in total while the mature range improves. Show the mature group, the mid-stage group and the launches on separate lines with their own targets. Track organic share of orders alongside TACoS, because it is the number that explains why TACoS moved.
Frequently asked questions
What is a good TACoS on Amazon?
It depends on margin and stage. Mature products in many categories sit under 10%; launches often run 25% or higher on purpose. Judge the trend and the organic share rather than a single benchmark.
How long does it take to shift sales from paid to organic?
Winning rank on a term takes four to six weeks of support in most cases, and the taper takes another four to eight. Expect a visible TACoS improvement on a mature ASIN inside a quarter, not a month.
Does branded search count as organic?
Orders from shoppers who searched your brand name and clicked an organic result are organic. Orders from a branded ad are paid, even though they are cheap. Track branded and non-branded separately, because a rising share of branded orders is a sign the brand is carrying more of its own sales.
Will cutting ad spend lower my TACoS?
Briefly, yes. Then organic rank slips, total sales fall, and TACoS climbs back or ends up higher. Taper support on ranked terms in steps and watch organic share; do not cut.