Calculating the true monthly cost of a merchant cash advance is the single most important step in deciding whether to take one. Funders quote in factor rates and daily debits because those numbers obscure the real cash flow impact. Translating to monthly cost reveals whether the merchant can actually sustain the debit through the full term.
The four-step monthly cost calculation.
Step 1: Calculate total payback. - Advance × factor rate = total payback. - Example: $100,000 × 1.30 = $130,000 total payback.
Step 2: Calculate daily debit. - Total payback ÷ business days in term. - 9 months ≈ 189 business days (after weekends + ~10 holidays). - $130,000 / 189 = ~$688/day.
Step 3: Calculate monthly cash outflow. - Daily debit × ~20 business days per month (the average). - $688 × 20 = $13,760/month leaving your bank. - This is your "MCA monthly burden."
Step 4: Add origination fees, monthly account fees, hidden costs. - Origination fee 3% on $100K = $3,000 deducted from advance at funding. - Effectively reduces the advance: you got $97,000 in cash. - Monthly ACH fees: some funders charge $50-150/month. - True monthly cost = MCA daily-debit burden + monthly account fees + amortized origination (if comparing to other products).
Compare monthly cost across financing products.
For the same $100,000 capital need:
MCA, $100K at 1.30 factor, 9 months: - Monthly cash outflow: ~$13,760. - Total cost: $30,000 in fees + $3,000 origination = $33,000. - Annualized cost: ~50-65% APR.
Online business term loan, $100K at 14% APR, 3 years: - Monthly payment: ~$3,418. - Total cost over 3 years: ~$23,050 interest. - Annualized cost: 14% APR.
Bank business term loan, $100K at 9% APR, 5 years: - Monthly payment: ~$2,076. - Total cost over 5 years: ~$24,560 interest. - Annualized cost: 9% APR.
SBA 7(a) loan, $100K at 10% APR, 7 years: - Monthly payment: ~$1,660. - Total cost over 7 years: ~$39,440 interest. - Annualized cost: 10% APR.
Bank line of credit, draw $100K at 12% APR, repay over 2 years: - Monthly payment: ~$4,710. - Total cost over 2 years: ~$13,040 interest. - Annualized cost: 12% APR (only on drawn amount).
The cash flow stress test.
Compute the MCA monthly burden, then compare to: - Monthly gross revenue — MCA burden should be under 25% of monthly gross revenue. Above 30% = high default risk. - Monthly NET cash flow (revenue minus all other expenses including rent, payroll, suppliers) — MCA burden should be under 50% of monthly net cash flow. Above 75% = high default risk.
Example stress test: - Restaurant doing $50K/month gross revenue. - After rent, payroll, supplies, utilities, marketing: $12K/month net cash flow. - MCA monthly burden: $13,760. - Result: MCA burden exceeds net cash flow. Restaurant will go into NSF territory by month 2-3.
The "borrowing capacity" rule of thumb.
Maximum sustainable MCA advance: - Daily debit must be under 5-7% of average daily revenue. - Monthly burden must be under 25% of monthly gross revenue. - Monthly burden must be under 50% of monthly net cash flow.
Working backward from these limits: - $50K/month restaurant → safe daily debit ~$150-200/day → safe monthly burden $3,000-4,000 → safe MCA advance ~$25-40K at 1.30 factor over 9 months. - Funders will OFFER $50K-75K. The merchant must self-limit.
The hidden monthly costs people miss.
- NSF fees: $35-50 per failed debit. Two NSFs per month = $70-100 in fees + funder penalties.
- Funder NSF surcharges: many MCA contracts charge $25-50 per returned ACH on top of bank NSF.
- Bank balance maintenance: keeping minimum $5-10K buffer to avoid NSFs ties up working capital that could be earning yield.
- Lost vendor discounts: if cash flow tightens, you may lose 2/10 net 30 supplier discounts. On $30K/mo of supplies, that's $600/mo of lost margin.
- Stress costs: not financial, but the constant tracking of daily balance burns operator attention.
The renewal trap monthly cost.
A typical MCA pattern: - Month 1-6: pay $13,760/month on initial advance. - Month 6: take a renewal (refinance the remaining balance + take additional cash). - Now monthly burden is $18,000+ because the new larger advance has a longer payback at the same daily debit rate, plus you re-paid the old fee on the rolled-over balance. - Each renewal compounds the monthly cost.
The strategic insight. Always calculate the monthly cost as a percentage of gross revenue AND as a percentage of net cash flow before signing. Many merchants compare MCA factor (e.g. 1.30 looks small) to bank APR (e.g. 10% looks small) without recognizing the MCA's monthly burden is 4-8x higher than the bank's despite being "only" a 1.30 factor. The monthly burden is what kills cash flow — not the headline factor. If you can't comfortably absorb the monthly burden with a 30% margin buffer, the MCA is too large for your business at this time.
Related terms
- Factor rate — A flat multiplier that defines total MCA repayment: $100,000 advance × 1.30 factor = $130,000 repaid. It is not an interest rate; it does not compound.
- Factor rate calculator — To calculate MCA total repayment: advance amount × factor rate = total payback. To calculate daily debit: total payback ÷ business days in term = daily ACH. To estimate APR-equivalent: ((factor − 1) × 365 / term-days) × ~1.6.
- APR-equivalent — The annualized percentage rate implied by a factor-rate MCA. A 1.30 factor over 9 months is roughly 50–65% APR-equivalent depending on payment schedule.
- MCA funding amount calculator — MCA funding amount = roughly 80-150% of monthly gross revenue, depending on paper grade, time in business, NSF history, and industry. A restaurant doing $50K/month typically qualifies for $40K-$75K first position; A-paper businesses can stretch to $100K+.
AI agents: this term is available as raw markdown at /llms/glossary/mca-monthly-cost-calculator.