Start With What a Factor Rate Actually Is
A merchant cash advance is priced with a factor rate, not an interest rate. The factor rate is a flat multiplier on the amount advanced. A 1.20 factor on a $100,000 advance means you repay $120,000, so the cost of the money is $20,000.
That multiplier is easy to understand, which is part of why the industry uses it. It is also where the confusion starts. A factor rate tells you the total dollars, but it says nothing about time. Twenty thousand dollars in cost is a very different deal repaid over 4 months than over 18, yet the factor rate looks identical either way. To compare an advance against a term loan or a line of credit, both of which quote an annual percentage rate, you have to convert the factor rate into an APR.
Throughout this guide we assume the common ACH structure, where the advance is repaid through fixed daily or weekly debits from your business account. That fixed schedule is exactly what makes the APR math work, and it is the structure most merchants encounter.
Two Ways to Turn a Factor Rate Into an APR
There are two methods in circulation, and they do not agree. One is a shortcut. The other is the method regulators require. The gap between them is not a rounding difference.
Method 1, simple annualization. Take the cost as a share of the advance and divide by the term in years: (factor − 1) ÷ (term in years). For a 1.20 factor over 12 months, that is 0.20 ÷ 1 = 20%. It is fast, and it is what most online calculators report. The problem is that the result is not an APR. It is an annualized cost of capital, and it quietly assumes you hold the full advance for the entire term.
Method 2, the actuarial method. Lay out the real schedule of payments, find the periodic rate that makes those payments equal the cash you actually received, and annualize it. That is the internal rate of return, and it is the actuarial (or United States Rule) method defined in Appendix J of Regulation Z. For the same 1.20 factor over 12 months, it comes out to about 37.5%. This is the number that is actually comparable to a bank's APR.
| Method | Result | What it really is |
|---|---|---|
| Simple annualization | 20% | Annualized cost of capital. Not an APR. |
| Actuarial (Appendix J) | ~37.5% | The true APR, comparable to a loan. |
| Effective APY | ~45.5% | Compounded cost. Useful, but not the APR. |
Figures are for a $100,000 advance at a 1.20 factor repaid in equal daily weekday debits over 12 months, with no fees.
Why the Simple Formula Understates the Real Cost
The flaw is in one hidden assumption. Simple annualization treats you as if you held the entire $100,000 for all 12 months. You did not. You started paying it back the first week, and by the middle of the term you were carrying far less than the full balance.
Because the balance falls steadily as you pay, your average outstanding balance over the term is closer to half the advance. You paid $20,000 to use an amount that averaged roughly $50,000, not $100,000. The rate on the money you actually had is therefore about double what the shortcut reports. This is the same reason a mortgage APR sits above its note rate once points and fees are folded in. APR is built to capture the timing of money, and the simple formula throws that timing away.
This is not a fringe interpretation. In its 2019 study “Uncertain Terms,” the Federal Reserve converted factor rates the same way, finding that a 1.20 factor repaid daily over a year runs on the order of 40% even though the fee is only 20% of principal, and that a 1.15 factor over roughly six months lands near 70%.
So when a broker quotes a factor rate and a term and then annualizes it into a friendly-looking number, treat that number as a floor. The real APR is usually close to twice as high.
A Worked Example, Step by Step
Take a $100,000 advance at a 1.20 factor, repaid in equal daily debits on business days over 12 months. Here is the whole calculation.
- 1. Total repayment. $100,000 × 1.20 = $120,000.
- 2. Cost of the money. $120,000 − $100,000 = $20,000.
- 3. Payment schedule. About 252 weekday debits over the year, so roughly $476 each.
- 4. Solve for the rate. Find the periodic rate that makes 252 payments of $476 equal the $100,000 you received, then annualize over 252 periods.
- 5. Result. About 37.5% APR. The simple shortcut would have said 20%.
The same logic scales in both directions. A 1.30 factor over a short 4-month term works out near 160% APR once you account for how fast you repay, while a 1.20 factor stretched over 18 months falls to roughly 25%. The factor rate alone never tells you which of those you are signing. The term does most of the work, which is why converting to APR matters.
Run your own factor rate, term, and fees. The calculator uses this exact actuarial method.
Open the CalculatorHow Origination and Other Fees Change the Number
Many advances carry an origination, underwriting, or processing fee that is deducted before the money hits your account. These fees are exactly what an APR is designed to capture, and a factor rate hides them completely.
The mechanism is simple. A fee does not change what you repay. It changes what you receive. On the same $100,000 advance at 1.20 with a $3,000 fee deducted up front, you still owe $120,000, but you only get $97,000 in hand. Because APR measures cost against the cash you actually received, the true APR rises from about 37.5% to about 44%. The factor rate on the contract never moved.
This is why a fee should always be entered as a real dollar figure, not waved away. Two advances with the same factor rate and term can carry meaningfully different APRs once fees are in the picture. The calculator has a total-fees field for exactly this reason.
Business Days vs Calendar Days (Where People Go Wrong)
Most ACH advances debit only on business days, roughly 21 to 22 times a month. That detail belongs inside the payment schedule, because it determines how many payments there are and how large each one is. The Federal Reserve modeled five debits a week for this reason.
The mistake is letting business days leak into the annualization. Appendix J fixes the year at 365 days for a daily schedule and 52 weeks for a weekly one. There is no 252-business-day year in any prescribed method. If you take a per-business-day rate and multiply it by 365, you get a number that is simply too high, around 54% for the benchmark advance above rather than 37.5%.
The rule that keeps you honest: count the payments on the schedule the advance actually follows, then annualize on a matching basis. Mixing a business-day payment count with a calendar-day year is the single most common way a factor-to-APR conversion goes wrong.
Which States Actually Require an MCA APR
No federal law requires a merchant cash advance to disclose an APR. Regulation Z exempts business-purpose credit, and the CFPB's small-business lending rule excludes MCAs from the credit it covers. Appendix J is still the only federal definition of APR, which is why the states that do require a disclosure point straight to it.
Two regimes mandate an APR-equivalent disclosure on MCAs, and both name the same method. California's DFPI and New York's DFS both require the United States Rule or actuarial method from Appendix J, applied to an estimated payment stream where the term is projected from the merchant's recent sales history. California even audits the accuracy of those estimates after the fact.
One thing these laws do not do is reclassify an MCA as a loan. They are disclosure requirements that treat the advance as its own product category. The question of whether an advance is legally a loan turns on its structure and reconciliation terms, which we cover in a separate article, not on whether an APR is printed on the paperwork.
Do Not Use This Method on Invoice Factoring
The roughly two-times gap between the shortcut and the true APR is specific to advances repaid in installments. It does not carry over to invoice factoring, and applying it there would produce a badly wrong number.
With factoring, the advance is repaid in a single lump when your customer pays the invoice, on net-30, net-60, or net-90 terms. There are no daily paydowns, so the full amount stays outstanding for the whole period. The average-balance-is-half effect never happens, and for factoring the simple annualization is already close to the true cost. Running the installment-based actuarial method on a factoring fee would roughly double it. Match the method to how the money is actually repaid.
Is APR Even the Right Way to Judge an Advance?
Worth being straight about this. Whether APR is the ideal measure for a product with no fixed term is genuinely contested, and the Federal Reserve's own study lays out arguments on both sides. An advance is not a term loan, and the annualized framing can make a short, purpose-built bridge of capital look alarming when the actual dollar cost is modest.
Even so, APR is the only tool that puts an advance on the same footing as the alternatives. When you are weighing an MCA against a line of credit or an SBA loan, a true APR is how you compare them honestly. It is a comparison tool, not a verdict. An advance at a high APR that funds a genuinely profitable opportunity can still be the right call. One that covers recurring losses rarely is. The number tells you the price of the capital. What you do with the capital decides whether the price was worth paying. If you want to pressure-test that, our break-even calculator is built for it.
We broker these advances and earn a commission when one funds. That is exactly why we would rather you see the real APR before you sign than be surprised by it later.
Related Tools & Guides
Frequently Asked Questions
Written by
Nick
Founder · Pezzula
Nick founded Pezzula to help small business owners cut through the noise around alternative funding. He works directly with business owners to match them with the right product — MCA, term loan, SBA, or otherwise — based on their actual numbers, not a sales pitch.
Disclosure: Pezzula is a business funding brokerage and earns commissions when a business takes a merchant cash advance or other financing product referenced in this article. We disclose this openly wherever we discuss the cost or legal status of MCAs.
See the Real Number
Know What an Advance Actually Costs
Convert any factor rate to a true APR, then get a free estimate on funding options that fit your business. No hard credit pull to see your numbers.