Notes
Rolling Reserves Explained: How the Hold Works and How Funds Come Back
What a rolling reserve is, why banks hold one, how the math works day by day, and how held funds are released. With sources from the OCC, PayPal and Shopify.
By ResearchPay Team ·
A rolling reserve is a share of each day's card sales that the bank holds for a set number of days, then pays out. New sales keep adding to the hold while old sales roll off. The bank holds it because it pays chargebacks the merchant can't cover.
This note covers the mechanics. For what a peptide store should expect at signup, read our reserve guide for peptide merchants.
Why do banks hold a reserve at all?
Because the bank is on the hook. The OCC's Comptroller's Handbook on merchant processing explains that when a merchant can't pay a chargeback, the acquiring bank pays it. A reserve is money set aside for that case.
Processors write the same right into their terms. PayPal's User Agreement (last updated Sept 14, 2026) lets PayPal place a reserve on an account. The Shopify Payments Terms (read Oct 31, 2026) let Shopify set a reserve at its discretion.
What kinds of reserve are there?
The merchant agreement names the type, the percentage, the period and the release terms. If any of those is missing, ask for it in writing.
| Type | How it works | When funds come back |
|---|---|---|
| Rolling | A percentage of each day's sales is held for a set period. | Each day's hold is paid out when its period ends. |
| Fixed or capped | Holds build until they reach a set dollar amount. | At the end of the agreement or after a review. |
| Upfront | A lump sum is held before or at go-live. | On the terms in the agreement. |
How does the math work?
Take a store with $3,000 in card sales every day, a 10% hold and a 90 day period. This is an illustration with round numbers, not a quote.
| Day | Held that day | Released that day | Total held |
|---|---|---|---|
| 1 | $300 | $0 | $300 |
| 30 | $300 | $0 | $9,000 |
| 90 | $300 | $0 | $27,000 |
| 91 | $300 | $300 (from day 1) | $27,000 |
- The held balance grows for the length of the period, then levels off.
- After that, each day's release roughly matches each day's hold.
- Cash flow takes the hit up front. Plan for it in the first months.
How are reserve funds released?
Under a rolling reserve, release is automatic as each day's period ends, unless the agreement says otherwise. Chargebacks and fees can be taken from the held balance first.
Changing the terms is a separate step. The bank reviews processing history, refund and dispute ratios and documentation. Clean history is the strongest case for a lower percentage or a shorter period. Nothing in the network rules requires the bank to change it.
What happens to the reserve if the account closes?
Disputes can still arrive after the last sale, so banks often hold the balance after closure. The length depends on the agreement. Read that clause before signing.
Sources
- Comptroller's Handbook: Merchant Processing, OCC, v1.0 Aug 2014, updated Mar 2025.
- PayPal User Agreement (US), holds and reserves, PayPal, last updated Sept 14, 2026.
- Shopify Payments Terms of Service, section C4, Shopify, read Oct 31, 2026.
ResearchPay works only with merchants that sell products labeled and marketed for research use only, not for human or animal use. Pricing, reserves and settlement terms are set by the acquiring bank during underwriting. This is general information, not legal advice.