Free Invoice Factoring Calculator
Waiting 30, 60, or 90 days to get paid can strangle an otherwise healthy business. Invoice factoring solves that by turning your unpaid invoices into cash today — but the pricing is often confusing, and a rate that looks tiny on paper can be surprisingly expensive once you annualize it. The BizFin247 Invoice Factoring Calculator makes the numbers obvious. Enter your invoice face value, the advance rate, and the factoring fee, choose whether the fee is flat or tiered per 30 days, and you instantly see your immediate cash advance, the total factoring cost, and the reserve rebate you get back once your customer pays.
It is free, requires no sign-up, and runs entirely in your browser — nothing you type is sent to a server. Use it to compare factoring quotes, sanity-check what a factor is charging you, and decide whether selling a receivable is worth it.
What Is Invoice Factoring?
Invoice factoring is a form of accounts-receivable financing. Instead of borrowing against your invoices, you sell them to a third party — the "factor" — at a discount. The factor advances you most of the invoice value up front, waits to collect the full amount from your customer, and then returns the remainder to you minus its fee. Because it is a sale of an asset rather than a loan, factoring usually does not add debt to your balance sheet and is often available to newer businesses that would not qualify for a bank line of credit.
Three numbers define almost every factoring deal:
- Advance rate — the percentage of the invoice the factor pays you immediately, commonly 80%–95%.
- Factoring (discount) fee — what the factor keeps for the service, expressed as a percentage of the invoice.
- Reserve — the portion held back (face value minus the advance). After your customer pays in full, the factor returns the reserve to you, less its fee. That returned amount is your reserve rebate.
Factoring also comes in two risk flavors. With recourse factoring, you must buy back (or replace) an invoice your customer never pays; with non-recourse factoring, the factor absorbs certain credit losses in exchange for a higher fee. This calculator estimates the cash mechanics of the deal — advance, fee, and rebate — regardless of which structure you choose.
How Factoring Rates Are Calculated
The mechanics are simple once you separate the three moving parts. Start with the immediate advance:
Cash Advance = Invoice Face Value × Advance Rate
Reserve = Invoice Face Value − Cash Advance
The factoring fee is where quotes differ the most, because there are two common structures:
- Flat fee — a single discount charged once, no matter how long the customer takes to pay. Example: a flat 2% on a $100,000 invoice is $2,000, whether the client pays in 20 days or 80.
- Accruing / tiered fee (per 30 days) — the discount rate is charged again for each 30-day period the invoice remains unpaid. At 2% per 30 days, an invoice paid in 60 days costs 4%, and one paid in 90 days costs 6%. This is the most common structure in US commercial factoring, and it is why slow-paying customers quietly raise your cost.
Total Factoring Fee = Invoice Face Value × Effective Fee %
Reserve Rebate = Reserve − Total Factoring Fee
Your net proceeds — the total cash you ultimately receive — are simply the face value minus the fee (the advance plus the rebate). The calculator also converts the fee into an effective annualized cost (an APR-style figure) on the money actually advanced, so you can compare factoring against a line of credit or term loan on equal footing. A 4% fee on cash you only hold for 60 days is roughly a 30% annualized rate — a critical reality check that the headline "4%" hides.
A Real-World Example
Imagine you run a staffing agency and just invoiced a corporate client $100,000 on Net-60 terms. You cannot wait two months to make payroll, so you factor the invoice. Your factor offers an 80% advance rate and a 2% tiered discount fee per 30 days.
- Immediate cash advance: 80% × $100,000 = $80,000 wired to you within a day or two.
- Reserve held back: $100,000 − $80,000 = $20,000.
- Total factoring fee: the client pays in 60 days, so the 2% tiered fee applies for two 30-day periods = 4% × $100,000 = $4,000.
- Reserve rebate: $20,000 − $4,000 = $16,000, returned to you after your client clears the invoice.
- Net proceeds: $80,000 + $16,000 = $96,000 (the $100,000 face value minus the $4,000 fee).
That $4,000 fee is 4% of the invoice — but because you only used the $80,000 advance for about 60 days, the effective annualized cost is roughly 30%. If that same client had instead paid in 90 days, the tiered fee would climb to 6% ($6,000) and your rebate would shrink to $14,000. Run both scenarios in the calculator above to see how payment speed drives your true cost.
When Factoring Makes Sense
Factoring is a cash-flow tool, not free money. It tends to pay off when:
- You have creditworthy business or government customers but long payment terms (Net-30 to Net-90).
- You need working capital to cover payroll, materials, or a new order faster than a bank loan can close.
- The profit on the work you can take on with the advance exceeds the factoring fee.
- You are a newer company, or in an industry like trucking, staffing, or manufacturing where factoring is standard and fast.
It is usually the wrong choice when your margins are thin, when customers pay slowly and unpredictably (which inflates tiered fees), or when a cheaper line of credit is genuinely available. Use the effective annualized cost from the calculator to compare — and pair it with the ROI and cash-flow tools linked below to confirm the advance actually funds something profitable.
Know the Real Cost Before You Sell an Invoice
A factoring quote is only a good deal if the numbers work for your margins and your customers actually pay on time. By seeing your advance, total fee, reserve rebate, and effective annualized cost up front, you can negotiate a better advance rate, avoid surprise tiered charges, and choose the financing that keeps your business liquid. Run a few scenarios above, print or save the summary, and take the real figures into your next conversation with a factor.
This calculator provides estimates for planning purposes only. Actual agreements may include additional service, wire, ACH, monthly minimum, or due-diligence fees, plus recourse obligations that change your true cost. Always confirm final figures with your factor.