The Short Answer: short-term cash access at a Steep Price
For a startup, a merchant cash advance (MCA) is a way to get a lump sum of cash quickly, often when you can't qualify for a traditional business loan. In exchange for the cash, you agree to pay back the advance, plus a significant fee, by giving the MCA provider a percentage of your future daily credit and debit card sales. The main things it can be useful to know are that an MCA is not a loan, it is high cost, and it lacks the federal consumer-protection context that apply to loans.
Because they aren't legally considered loans, MCAs are not subject to state usury laws that cap interest rates. Instead of an Annual Percentage Rate (APR), they use a factor rate, which hides the true, often extremely high, effective APR. Approval can happen in as little as 24 hours with minimal paperwork because providers are more interested in your daily sales volume than your personal or business credit score. This speed and accessibility are tempting for new businesses needing immediate capital, but they come with serious risks, including aggressive collection tactics and the potential to trap your startup in a cycle of debt. Before considering an MCA, it is critical to understand its unique structure, calculate its true cost, and explore all other financing alternatives.