A rolling reserve withholds a fixed percentage of every settlement and releases each withheld slice a set number of days later, most often 180. Nothing is deducted permanently — the merchant simply carries a standing balance with its provider for as long as the arrangement runs, and finances it out of its own working capital.
The two numbers that define it
A rate and a holding period, and nothing else. Ten percent at 180 days means every payout arrives a tenth short, and each slice comes back six months to the day after it was taken. Where the withheld money sits, and who can spend it, is the subject of the reserve account.
Steady state on $500,000 a month
At ten percent, $50,000 is withheld each month. Nothing is released for the first six, so the balance climbs: $50,000, then $100,000, and so on to roughly $300,000 by month six. From month seven, releases and deductions run at the same rate and the payout normalizes — but the $300,000 stays parked for the life of the arrangement.
The first six months are the expensive part. A business funding that out of trading profit is effectively lending its provider half a year of revenue at that percentage, at exactly the point in its life when cash is tightest.
What happens when volume moves
Growth makes it worse before it makes it better. Double the monthly volume and the standing balance climbs toward $600,000 over the following six months, drawing cash out of the business precisely while it is scaling.
The unwind runs the same way in reverse. Stop processing and no new slices are taken, but the last one still releases 180 days after the final transaction, so the account carries a shrinking tail for six months after the business has gone quiet. Anyone selling a payment business needs that tail in the model, alongside any settlement delay already applied to the payouts themselves.
Which merchants are asked for one
The condition is set during underwriting and follows risk rather than size: long gaps between payment and delivery, travel and ticketing, recurring products, thin trading history, or a dispute rate drifting toward scheme thresholds. A one-off retention against a single suspicious batch is a holdback instead, imposed for an event rather than a profile.
Bringing the rate down
Terms are commercial, and providers move on evidence. Consecutive months of disputes well under scheme limits, shortened delivery times, audited accounts, or a bank guarantee offered as a substitute for cash all help. Ask for a written step-down — ten percent falling to five at month six if the ratio stays below an agreed level — rather than a promise to review, which tends not to happen unless someone chases it.