If your business takes card payments, at some point you'll get the call. It's usually pitched as fast, flexible funding: a lump sum against your future card sales, no fixed monthly repayment, no lengthy application, money in your account within days rather than the weeks a bank loan can take. For a business with a genuine short-term cash need and a poor credit history, or one that's been turned down by a bank, it can sound like the answer nobody else was offering. It's worth understanding exactly what you're agreeing to before you take it, because the pitch and the product are two different things.
How it actually works
A merchant cash advance isn't a loan in the traditional sense — there's no interest rate, no fixed term, and technically no fixed repayment schedule. Instead, the provider advances you a lump sum, and takes a fixed percentage of every card transaction you process from then on, automatically, until the advance (plus their fee) is repaid. On a slow week you pay back less; on a busy week you pay back more. That flexibility is genuinely the product's biggest selling point, and for a highly seasonal business it can be a real, practical advantage over a fixed monthly loan repayment that doesn't care whether trade is good or bad that month.
Where the real cost hides
The catch is in how the total cost is expressed. Rather than an interest rate, providers quote a 'factor rate' — borrow £10,000 at a factor rate of 1.3, for example, and you repay £13,000, however long it takes. Expressed that way it can sound almost reasonable. Converted into an equivalent annual percentage rate, the way a loan or credit card cost is normally compared, merchant cash advances frequently come out significantly more expensive than a bank loan, an overdraft, or standard invoice finance — often dramatically so if the advance is repaid quickly, because the fixed fee doesn't shrink just because you paid it back fast.
A factor rate of 1.3 sounds like a fee. Converted to an annual rate, it's often the most expensive money a small business can borrow — and the flexible repayment is precisely what makes that easy to lose sight of.
The trap that catches good months, not bad ones
The mechanism has a less obvious downside too: because repayment is a fixed percentage of every card sale, a genuinely strong trading period doesn't feel like relief — it means more is coming out of the till at exactly the moment cash flow should be easing. Some businesses end up taking a second advance to repay the first once the daily deductions start squeezing working capital, which is precisely the kind of debt spiral that any funding option promising speed and few questions asked should make you cautious about from the outset.
When it can genuinely make sense
None of this makes merchant cash advances always the wrong call. For a business with a short, specific cash need, decent and predictable card turnover, and no realistic access to cheaper funding — perhaps because of a thin trading history or credit blip that rules out a bank loan — the speed and lack of fixed repayment can be worth the premium, particularly if the alternative is missing a genuinely profitable opportunity, like stock for a busy season that will comfortably cover the cost. The mistake isn't using one; it's using one as a first resort rather than a considered last one.
Why the sales pitch works so well
It's worth understanding why these offers land so effectively, because it's rarely about the merits of the product itself. They typically arrive at exactly the moment a business is feeling a cash squeeze, often via an unsolicited call from a provider who already has your card-turnover data through your payment processor, and the pitch is built entirely around speed and simplicity at a moment when speed and simplicity feel like exactly what's needed. That's precisely the state of mind in which a genuinely expensive product looks most attractive, and precisely why it's worth pausing to run the comparison properly rather than saying yes on the call.
Questions worth asking the provider directly
Before signing, ask plainly what the total repayment figure is in cash terms, not just the factor rate, so there's no ambiguity about what you owe overall. Ask whether there's any cost or penalty for repaying early, since a genuine no-penalty early repayment can meaningfully change the equivalent APR if your card sales turn out stronger than expected. And ask what happens in a genuinely bad month, or several in a row — some providers apply a minimum payment regardless of sales, which quietly removes the flexibility the whole product is sold on. A reputable provider will answer all of this clearly and without hesitation; reluctance to give straight answers to straight questions is itself useful information.
What to do before saying yes
Always convert the factor rate into an equivalent APR before comparing it to anything else, so you're judging it on the same terms as a loan or overdraft. Ask what percentage of daily card sales will be taken and model it against a genuinely slow month, not just an average one. And check what happens if you switch card processing providers or trading dips hard — some agreements include minimum repayment terms that remove the flexibility that was the whole point of choosing this route in the first place. Loan, overdraft or invoice finance is worth reading before any of these conversations, because a merchant cash advance is rarely the cheapest option on the table — it's usually the fastest, and knowing the difference is what keeps it a sensible tool rather than an expensive mistake.
