A standard break-even ACOS calculation only accounts for the first purchase. For products with repeat purchases, that leads to systematically under-investing in acquisition, because it ignores the profit from the second, third, and fourth orders that follow. The Break-Even ACoS page recalculates your target ACOS using your actual repeat purchase data, not assumptions.
When to use it: quarterly, and whenever you set or revise ACOS targets with your PPC team.
How the calculation works: the page calculates break-even ACOS across four time horizons (1, 3, 6, and 12 months) based on:
Your average sale price (last 30 days)
Your average profit per unit before advertising (uses your entered COGS)
Your actual LTV multiplier from cohort data (how many units the average customer buys within each window)
Step 1: Open the table
Open the LTV & Subscriptions report and go to the Break-Even ACoS page. Find your product in the table. For each parent or child ASIN you will see the average sale price, the average profit per unit (excluding ads), and the break-even ACOS for 1, 3, 6, and 12 months.
Step 2: Pick your payback window
The key decision is how long you are willing to wait to recover your acquisition cost. As a worked example: if your average profit per unit before ads is $10 and your customers buy an average of 3.5 times within 12 months, your break-even ACOS looks like this at each window:
Payback window | What it means | Break-even ACOS (example) |
1 month | Profitable from the first order alone | ~56% |
3 months | Recoup investment within one quarter | ~78% |
6 months | Recoup within half a year | ~104% |
12 months | Recoup within a full year of repeat orders | ~139% |
For brands with strong retention and healthy cash flow, a 3-month payback window on acquisition campaigns is often the right target.
Step 3: Read the Payback Period column
The Payback Period column shows how many months it takes to recoup your advertising investment, based on your current ACOS against each break-even threshold. How to act on it:
Payback period of 1 to 2 months: a strong case for scaling acquisition spend aggressively.
Payback period of 3 to 6 months: you can grow if cash flow allows. Worth pushing on high-opportunity keywords.
Payback period over 6 months: you are close to maximizing your investment capability. Review your first-order acquisition cost and invest in retention instead: retargeting, Brand Tailored Promotions, or additional variations.
Step 4: Share the ceiling with your PPC team
Share the Break-Even ACoS table directly with your PPC manager or agency, with a clear brief: "We are comfortable with up to X% ACOS if the payback period is within 6 months." It gives them a data-backed ceiling to work within and removes the guesswork from budget decisions.
Only scale where market share is not maxed. A high LTV-adjusted ACOS target only makes sense on keywords where your market share is not already maximized. Increasing spend on fully captured keywords will not bring in new customers, it will just cost more to keep the same ones. Always cross-reference with the Market Share & Funnel report before scaling spend on any keyword.
Exclude branded terms before reading this report. Your branded ACOS is artificially low, and branded LTV overstates acquisition value, since branded customers were likely going to find you anyway. Go to Advertising Analytics, open Keywords & Search Terms, and use the "Search Terms Contains" filter to exclude branded terms by adding ! before the brand name. Example: if the brand name is "Apple", use !apple. Then review ACOS at the search term level to build the strategy, rather than relying on the overall product-level ACOS.