Tomás runs an online retail business that, after six months on the platform, was placed in his card processor's higher-monitoring tier — a categorisation triggered by the industry he sells in, not by anything that had actually happened on his account. The terms of the tier include a 10% rolling reserve, held for 180 days from each transaction date.
Six months in, the reserve has accumulated to roughly £15,000. None of that money is reachable. It sits with the processor as a contingent buffer against chargebacks that, in his case, have not occurred. Zero disputes. Zero clawbacks. Just £15,000 of his own working capital, frozen by a model that assigned him to a tier on day one and has not revisited the assignment since.
£15,000 is what Tomás would otherwise be using for inventory, marketing, his own salary, or simply as a buffer against a quiet month. Instead, it is the cost of being categorised.
What rolling reserves actually are
A rolling reserve is a percentage of a merchant's settled volume that the processor holds back as a contingent fund for chargebacks. The terms vary — 5%, 10%, or higher; held for 90 days, 120, or 180 days from the transaction date — but the structure is the same. Money the merchant has earned, has settled, and which is technically theirs, is held in a separate account that they cannot access, while the rolling window stays open.
The practical effect is that a percentage of every month's revenue is invisible to the merchant for the next several months. On a steady-state business, the reserve eventually plateaus — once 180 days have passed, the oldest funds become available as new ones are held. But during the ramp period, and any time volume grows, the reserve absorbs working capital faster than it releases it. A growing merchant is always running with more of their own money frozen than freed.
This is common industry practice for merchants in categories that processors classify as elevated-risk — supplements, ticketing, travel, certain digital services, dropshipping, and any number of legitimate industries that processor risk models flag. It is also applied selectively to newer merchants, merchants whose volume grows quickly, or merchants whose transactions look unusual against an algorithm.
Why the reserve exists — and who actually pays for it
The reserve exists because card networks impose chargeback liability on processors. When a customer disputes a charge, the processor is on the hook to refund — and they price that risk by holding back a buffer from the merchant's own funds. From the processor's side, this is a sensible risk-management tool. From the merchant's side, it is an interest-free loan that they do not get to refuse.
The merchant pays for the reserve in three ways. The first is direct: working capital is frozen, so any business activity that needed that capital — inventory, hiring, growth investment — is constrained or has to be funded elsewhere. The second is interest cost: if the merchant funds the gap from a credit line, they pay interest on capital they technically already own. The third is opportunity: a merchant who would otherwise be growing the business with retained earnings is instead growing it with debt, or not growing it at all.
None of this appears as a fee on a processor invoice. It is the silent operational tax of being in a category the model considers risky.
Rolling reserves of 5% to 10% of monthly volume, held for 90 to 180 days, are common industry practice for merchants in categories card processors classify as elevated-risk.
— Common industry practice as published in card-processing terms across major providers
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