Lifetime-Deal Math: Net Cash That Funds the Build
A five-step lifetime-deal payout test for founders: check gross sales, refunds, payout timing, support cost, and build funding before you build.
You can pre-sell a lifetime deal before you incorporate, before your first customer, and before the product is finished. The dangerous part is the cash you think you will keep.
A lifetime deal can validate the idea with real buyers. It can also leave you with refunds, a delayed payout, and support you never priced. Use the payout test below before you commit to a launch.
Run the five-step payout test before launch
AppSumo pays sellers on a Net 60 end-of-month basis, and refunds can reduce current or future payments.
A lifetime deal on AppSumo gives access for the product's lifetime, not the buyer's lifetime, and the deal ends if the product shuts down.
Those two rules shape the test. You are selling access that can last until the product shuts down, and the payout may arrive after your cash is gone. Work down the list before you promise a date, a price, or a feature.
- Gross sales: total the money before refunds and fees. AppSumo's published rate figures are 95% of revenue from new buyers a seller brings, less a 5% processing fee, and 70% from returning AppSumo customers.
- Refund rate: subtract refunded codes from sold codes, then use the remaining codes for support and validation.
- Payout date: mark when cash actually lands, not when the campaign ends.
- Lifetime support cost: estimate ongoing support for every remaining code, not just the launch week.
- Build-funding threshold: compare net cash to the minimum cost to ship a version that solves the core problem.
The test turns the launch into a funding decision. You see the cash after the platform takes its share, after refunds arrive, and after support begins. If the net cash is too small, the campaign is not a build plan, even if the gross number looks strong.
Start with gross sales because it is the number that feels good. Use the new-buyer figure for buyers you bring and the returning-customer figure for AppSumo's existing customers. Then cut refunds before you celebrate. A buyer can pay, try the product, and decide it is not for them, so the refund rate is the stress test for your cash balance.
Next, mark the payout date. The launch may end before the money lands, and a delayed payout can arrive after your cash is gone. Put the payout date next to your cash balance and ask whether you can cover the build until the payment arrives.
Then price lifetime support. Every remaining code can ask for help, and the deal can outlive your original plan. The support queue can outlast the launch, so estimate it for the codes left after refunds, not the codes sold, and subtract it from the net cash before you compare it to the build cost.
Finally, set the build-funding threshold. Write down the minimum cost to ship a version that solves the core problem. The net cash must cover that cost before you promise anything. Otherwise, the campaign is buying you a promise you have to keep.
Use the examples to size the net cash
Tailride's AppSumo Select campaign began on Monday, 28 April 2025, and ran through 13 July 2025.
It generated $144,028 gross, sold 1,136 codes, and had 247 refunds.
It paid out $34,933.77 net, about 24% of gross, under a 30% revenue share.
That example shows the gap between the headline and the cash. The gross number is large, but the net payout is the number you can use to fund the build. The refund count matters because the remaining codes create support work and the validation you can trust.
A smaller case shows the same test. In a zero-audience AppSumo case, a founder with about 20 followers sold 507 $19 lifetime-deal licenses over 4.5 months, saw 145 refunds, ended with 362 net licenses, and kept $3,209, or $8.86 per sale.
The smaller case shows the net cash is small. If $3,209 cannot cover the minimum ship cost and the support cost, the campaign is not funding the build.
MySignature shared roughly 70% of AppSumo revenue with AppSumo, kept about 30%, and the final revenue share was discussible.
Ask for the final terms in writing before you launch. The share can move, and the payout date can move with it. Put the written terms into the payout test before you count the cash as available.
If the math says no, wait
If the net cash cannot cover the build-funding threshold, do not launch. Shrink the scope, wait for a smaller path to early customers, or hold the launch until the cash can fund the build.