How it works
The acquirer sets a percentage and a holding period. Each payout is reduced by that percentage, and the withheld amount is released when the period expires, rolling forward continuously as new payments arrive.
Typical terms run from 5 to 10 percent held for 180 days in ordinary categories, and from 10 to 15 percent in high-risk ones. Some agreements go further.
The word rolling matters. This is not a one-off deposit that gets returned. Once the arrangement reaches steady state, a fixed amount of money is permanently unavailable to the business for as long as the account is open.
What it locks up
The arithmetic is worth doing, because merchants routinely underestimate it.
A business processing 100 000 dollars a month with a 10 percent reserve held for 180 days has 10 000 dollars withheld every month. After six months, 60 000 dollars sits with the acquirer, and that balance stays there. Every month a new 10 000 goes in as an old 10 000 comes out.
At a million a month on the same terms, 600 000 dollars is locked. For a business with thin margins and a working capital cycle, that is often larger than its entire monthly profit.
The money is the merchant’s and earns the merchant nothing. Whoever holds it does earn on it.
Why acquirers use it
Because the risk is real from their side. A merchant that fails, disappears or gets hit with a wave of disputes leaves the acquirer liable for refunds it cannot recover. The reserve is collateral against that.
The logic is sound. What merchants object to is the sizing, which is set by category rather than by their own record, and rarely revised downward without a fight.
Why crypto rails do not use reserves
There is nothing to reserve against. A confirmed blockchain transfer cannot be reversed, so no future liability accumulates behind a completed payment, and there is no reason to hold funds against one.
Settlement is therefore the full amount, minus the processing fee, released on the schedule agreed. For a high-risk merchant this is frequently a bigger financial improvement than the fee difference, because it returns working capital rather than reducing a cost line.
What to check in the contract
Four numbers decide how much this costs you, and all four are negotiable at signing far more easily than afterwards.
The percentage withheld. The holding period, which is what turns a percentage into a locked balance. Whether the reserve is capped or grows indefinitely with volume. And what happens on termination, specifically how long after closing the account the final balance is released.
A merchant who reads only the headline rate and signs will discover the rest in month seven, when the locked balance stops growing and reveals its actual size.