How Amazon Subscribe & Save works for FBA sellers
Amazon Subscribe and Save (S&S) turns one-time buyers into recurring revenue. A customer clicks the S&S option on a product detail page, selects a delivery interval (every 1, 2, 3, 4, 5, or 6 months), and Amazon automatically places the order on that schedule unless the customer cancels or skips.
Eligible FBA products are auto-enrolled at a 0% seller-funded discount. You can increase the seller-funded discount to 5% or 10% to make the Amazon Subscribe and Save offer more attractive. Amazon funds an additional 5% discount on orders where the customer has 5 or more active subscriptions, which comes from Amazon, not your margin.
Requirements: you need a Professional seller account, FBA participation for at least 3 months on the ASIN, Brand Registry enrollment, and an in-stock rate of at least 85%. Products in most consumable, health, grocery, beauty, and pet categories are eligible. Durable goods generally are not. Amazon’s Subscribe & Save program page details the latest eligibility requirements and discount structures.
The Subscribe & Save discount math
| Scenario | Seller-funded | Amazon-funded | Customer sees |
|---|---|---|---|
| Default (under 5 subscriptions) | 0% | 0% | 0% off |
| Default (5+ subscriptions) | 0% | 5% | 5% off |
| 5% seller discount (under 5) | 5% | 0% | 5% off |
| 5% seller discount (5+) | 5% | 5% | 10% off |
| 10% seller discount (5+) | 10% | 5% | 15% off |
Effective margin formula:
LTV gain = S&S margin x average reorders before cancellation
Example: a consumables brand at $1.8M
A supplements brand sells 12 SKUs at $1.8M annually (ASP $28, roughly 64,300 units/year). The seller offers a 5% S&S discount on all SKUs. Contribution margin before the discount is $8.40 per unit (30%).
S&S margin impact per unit:
- Discount cost: $28 x 5% = $1.40 per unit
- Adjusted contribution margin: $8.40 – $1.40 = $7.00 per unit
Within 6 months, 22% of customers are subscribing. That is 14,146 units/year on subscription. The average S&S customer reorders 4.2 times before canceling (industry average for supplements is 3 to 5 reorders).
LTV comparison:
- One-time buyer LTV: $8.40 (single purchase)
- S&S subscriber LTV: $7.00 x 4.2 = $29.40
- LTV multiple: 3.5x
The 5% discount costs $19,804 annually ($1.40 x 14,146 units), but those subscribers generate $98,922 in contribution margin ($7.00 x 14,146). Without S&S, most of those repeat purchases would not happen because the customer would forget or switch brands.
The inventory planning benefit matters just as much. S&S orders are scheduled in advance, giving you a predictable demand baseline. For this brand, 22% of demand is now forecastable with near-zero variance, which directly reduces the safety stock buffer needed on those SKUs.
Common mistakes
- Stocking out on S&S SKUs. When a subscribed customer’s order fires and you are out of stock, Amazon cancels that subscription delivery. The customer often does not re-subscribe. Stockouts on S&S products cost you the entire remaining LTV of that subscriber, not just one lost sale. Maintain at least 85% in-stock rate or risk losing your S&S eligibility entirely.
- Offering 10% seller-funded discounts without checking the margin. On a $28 product with $8.40 contribution margin, a 10% discount ($2.80) eats 33% of your margin per unit. Run the math on your actual contribution margin before increasing beyond 5%.
- Ignoring S&S demand in reorder calculations. S&S orders are scheduled and predictable. Your reorder point formula should treat S&S volume separately from organic demand because the variance is much lower. Blending them inflates your safety stock unnecessarily.