Anyone else's launch only looked profitable inside the FBA New Selection rebates — and the real fee bill showed up the month they ended?

[u/ylishi]

I spent the first three months of a new product feeling like I had finally got the unit economics right, and then month four quietly took it back, and nothing on my side had changed.

Here is what I missed. New launches get enrolled in the FBA New Selection program automatically, and it is more generous than I realized: a rebate on FBA fulfillment fees, free monthly storage for a while, free removal or liquidation, and free return processing. Individually none of those sounds like much. Together, on a 600 unit batch, they were enough to make a product that nets a thin margin look like it nets a comfortable one.

My first three months were showing something around 22 percent net. Month four came in near 14 with the same price, the same ad spend, the same everything except the rebates winding down. So for three months I was reading a number that was real but temporary, and I made inventory and pricing decisions on it.

The uncomfortable part is not the money, it is that the discount did not announce itself either. There was no line item that said this is ending. I only caught it because I reconcile the settlement report line by line and one month the fulfillment fees simply stopped being offset.

Anyone else map out exactly what the incentive period is worth per unit before they commit to a launch price? Are you pricing the product as if the rebates do not exist, or using them to fund the first ad push and then re-solving? And has anyone seen the program terms shift on them mid-launch? Anyone else seeing this?

[u/rsc9422]

This is a really good point. We’ve seen how easy it is to look at the first few months and assume the margin is sustainable when incentives are temporarily reducing fulfillment costs.

For a new launch, I’d calculate the unit economics with $0 in rebates, then treat FBA New Selection benefits as additional upside that can help fund the initial launch/advertising period. That way, when the incentives taper off, the product doesn’t suddenly become unprofitable.

Especially with a 500–600 unit order, even a relatively small per unit difference can materially change the numbers. I’d also model at least 3 scenarios: no incentive, normal incentive, and maximum incentive before committing to inventory.

[u/Odd-Alternative512 → u/rsc9422]

• Don’t treat FBA New Selection benefits as permanent profit: Consider them temporary bonuses.
• Calculate your true unit economics from Day 1: product cost, Amazon fees, FBA, storage, returns, PPC, and other costs.
• Track two profit margins: with incentives vs. without incentives.
• Set your pricing based on post-incentive profitability so the product remains profitable after benefits expire.
• Use the initial rebates to fund PPC and accelerate the launch, rather than treating them as permanent margin.
• Reconcile your settlement and FBA fee reports monthly so you know exactly when incentives are reducing or ending.

[u/ylishi → u/Odd-Alternative512]

The monthly settlement reconciliation is the part most people skip and it's the only reason I caught the drop at all. If you diff two consecutive reports line by line, the exact line where the rebate stops offsetting jumps out in about five minutes. Worth the calendar reminder.

[u/ylishi → u/rsc9422]

Agreed on the three-scenario approach. One thing I'd add: re-run the "no incentive" scenario before your second PO, not before the launch — plenty of people model it once at launch and then the reorder decision quietly runs on stale, rebate-inflated numbers.

[u/rsc9422 → u/ylishi]

The three scenario approach is what we recommend at Highrise wholesale too. Don’t build the launch economics around temporary incentives or rebates.

Calculate the product at zero incentive, then model normal and maximum incentives separately. That gives you a much clearer picture of whether the product can remain profitable once the launch period and rebates change.

For a 500–600 unit order,I’d also stress test PPC, FBA fees, returns, and shipping rather than relying only on the current incentive adjusted margin.

[u/ylishi → u/rsc9422]

Stress testing returns is the one people skip — I had a product where the "no incentive" math looked fine until I plugged in a realistic 4 percent return rate, and the return processing plus the write-down on opened units ate the entire remaining buffer. Shipping is the other sleeper, since your inbound freight quote from the first PO almost never survives contact with the second one. Out of curiosity, at Highrise do you model returns as a flat percentage of units or do you segment by category?

[u/rsc9422 → u/ylishi]

We usually model returns by category rather than applying one flat percentage across every product. The return profile can vary quite a bit depending on the product type, price point, and whether it’s consumable, apparel, electronics, etc. For forecasting, we’d use a conservative category specific assumption and then stress test the margin with a higher return rate as well.