Invoice financing cost calculator
The per-period fee hides a triple-digit APR.
A factoring company will advance most of your invoice today for a fee. The fee looks small — but it is charged on the whole invoice for the days you get paid early.
Enter your invoice amount, the advance, the fee, and how many days early you get paid. The calculator shows the fee and the real annualized cost.
The fee is smaller than the cost
A factoring company offers to advance 80% of your $10,000 invoice and charges 3% per 30 days. That sounds like 3% — until you realise you only borrowed the 20% reserve, and you paid 3% on the whole invoice to get it. The calculator converts that seemingly small fee into the annualized percentage rate (APR) it really represents, which is almost always shocking.
Why the APR explodes
Invoice financing is a very short loan against a single invoice. You hand over a slice of the invoice as a fee in exchange for cash today instead of in 30 or 60 days. The fee is computed on the full face value, but the cash you actually received early is only the reserve the factor was holding. Dividing the fee by that small borrowed amount, then annualizing it across 365 days, produces an APR that routinely lands in the triple digits. The calculator shows both the flat fee and that APR side by side so you can compare it honestly to a business line of credit.
Two numbers that matter: advance and fee
The advance rate is the share you get immediately — commonly 70–90%. The reserve (the rest) is released when your client pays, minus the fee. The fee is usually quoted per 30 days, so a 45-day wait costs 1.5 periods of it. A lower advance means you borrow less and the fee looks smaller in dollars, but you also wait longer for the bulk of your money. The calculator separates "cash now," "reserve later," and "fee," so the structure is visible rather than buried in a rate sheet.
When it is worth it
Financing makes sense when the early cash unlocks something the waiting would block: covering payroll, taking a bigger job that needs upfront spend, or smoothing a slow season. If a client is simply going to pay in 30 days on their own, factoring that invoice costs you real money for no benefit. The honest test is "what does the cash let me do today that I could not do in 30 days?" If the answer is "nothing," the fee is pure leakage.
Factoring vs a line of credit
A business line of credit charges interest on the drawn balance, often at a far lower effective rate than invoice factoring, and you keep control of the client relationship. Factoring can be easier to qualify for and faster, which is why many new freelancers reach for it — but once you have any credit history, a line of credit is usually cheaper. Compare the calculator’s APR against whatever your bank or a fintech lender quotes; the gap is often wide.
The relationship cost nobody prices
With factoring, the factor often collects from your client directly, which some clients find odd or unprofessional. Selective or "spot" factoring — financing only the one invoice that is strangling your cash flow, rather than every invoice — limits that exposure and the fees. The calculator is built for exactly that decision: punch in the one invoice, see the true cost, and decide whether this single early payment is worth what it charges.
Estimates only. The calculator assumes a flat fee per 30 days on the invoice face, an advance paid now, and the reserve released at client payment less the fee. It ignores setup fees, per-invoice minimums, and credit-check charges that some factors add. APR is a simple (non-compounding) annualization of the fee against the borrowed reserve. Actual terms vary widely by factor and client credit — read the contract, and treat the figures as a comparison tool rather than a quote.
Frequently asked questions
Why is the annualized cost so much higher than the fee?
Because the fee is charged on the whole invoice, but you only borrowed the reserve the factor held back. Annualizing that fee against the small amount you actually borrowed — across 365 days — produces a triple-digit APR even when the per-period fee looks tiny.
What is the difference between the advance and the reserve?
The advance is the share (often 70–90%) you receive immediately. The reserve is the remainder, released when your client pays, minus the fee. The calculator shows both so you can see how much cash you wait for.
When does invoice financing actually make sense?
When the early cash unlocks something waiting would block — payroll, an upfront job cost, a slow season. If a client would pay in 30 days anyway, factoring just costs you money for no gain.
Is factoring better than a line of credit?
Often not. A line of credit usually carries a much lower effective rate and keeps you in control of the client relationship. Factoring wins on speed and easy qualification, which is why new freelancers use it — but compare the APR the calculator shows against a bank or fintech rate.
What is spot factoring?
Financing just one invoice rather than all of them. It limits both the fees and the awkwardness of a third party collecting from your client. The calculator is built for that one-invoice decision.
Does the fee come out of my advance or my reserve?
Typically the fee is deducted from the reserve released at payment, so your up-front cash is the advance minus the fee. The calculator reports "you receive up front" as advance less fee, and "total you collect" as the invoice less the fee.