Use this invoice factoring calculator to estimate cash from selling an unpaid invoice. Enter its face value, advance rate, fee per 30 days, funding period, and fixed charge. Compare the upfront advance with the reserve settlement and total net proceeds.
Invoice factoring results
The settlement can be negative when fees exceed the reserve; that amount may be payable separately. It assumes the customer pays the invoice in full after the entered days.
How the invoice factoring calculator works
The invoice factoring calculator models a conventional two-stage arrangement: a factor advances a percentage of the face value when the invoice is sold, and the remainder is held as a reserve. After the customer pays the factor, fees are deducted from that reserve and the balance is settled with the business. Actual arrangements can vary substantially. Some providers instead advance nearly all of the value after a fee, use tiered fees, or charge on a different base.
Initial reserve = invoice face value − upfront advance.
Time-based fee = invoice face value × fee rate per 30 days ÷ 100 × funding days ÷ 30.
Total fees = time-based fee + fixed fee.
Reserve settlement = initial reserve − total fees.
Total net proceeds = upfront advance + reserve settlement = invoice face value − total fees.
Simple annualized fee / advance = total fees ÷ upfront advance × 365 ÷ funding days × 100%.
The fee in this invoice factoring calculator accrues linearly, including partial 30-day periods. A contract that bills a full fee for every started month will produce a different amount. The annualized figure is a rough financing comparison that divides fees by the amount advanced and scales by 365 days. It is unavailable when the advance is zero and should not be interpreted as APR, an effective yield, or a quoted borrowing rate.
Worked example: a $10,000 invoice
Suppose an unpaid invoice has a $10,000 face value. The factor advances 80%, so the business receives $8,000 upfront and $2,000 is initially held as reserve. The fee is 2% of the invoice per 30 days, prorated over 45 days: $10,000 × 2% × 45 ÷ 30 = $300. An additional $50 fixed fee brings total fees to $350.
After full customer payment, the reserve settlement is $2,000 − $350 = $1,650. Total net proceeds are $8,000 + $1,650 = $9,650, which is $350 less than collecting the invoice without factoring. Fees equal 3.5% of face value for this example. The simple annualized fee relative to the $8,000 upfront advance is ($350 ÷ $8,000) × (365 ÷ 45) = about 35.49%. The amount and timing of fees matter much more than that scaled comparison alone.
As QuickBooks explains in its factoring overview, businesses may receive an advance and a later remaining balance after the factor receives customer payment, less applicable fees. Compare a written proposal carefully: the advance, collection terms, reserve treatment and fee base may differ from this invoice factoring calculator’s assumptions.
Understanding the advance and reserve
The advance rate controls cash received now, not total cash after collection. At an 80% advance, the factor withholds 20% initially. When the customer pays in full, the factor typically settles some or all of that remainder after contractual deductions. For the seller, the invoice factoring calculator highlights earlier access to cash. For the buyer of the invoice, the reserve helps cover fees and possible adjustments.
If total fees exceed the reserve, the invoice factoring calculator shows a negative reserve settlement. For example, a 100% advance leaves no reserve, so every fee appears as a separate amount due in this simplified model. The total net proceeds still equal face value minus fees. Your provider may instead deduct fees from the initial transfer, collect them later, or use an additional reserve or deposit. The invoice factoring calculator uses one consistent convention to make the arithmetic transparent.
Invoice factoring involves selling a receivable, while invoice financing can involve an advance secured by the invoice with repayment obligations. The commercial and accounting treatment depends on the contract. Recourse, disputed invoices, customer nonpayment, chargebacks, minimums and termination fees are outside this tool. Review who bears each risk before treating the projected reserve settlement as assured cash.
Comparing offers and cash flow
The invoice factoring calculator can compare offers with different advance rates, fee percentages and funding periods. A higher advance can improve immediate liquidity but may change the fee or reserve terms. A longer customer payment period raises the modeled prorated fee. Compare the quote’s actual billing increments with the days entered in the invoice factoring calculator. For a provider that charges a flat fee regardless of time, use a separate manual quote comparison rather than interpreting the 30-day input as a contract term.
Check the expected collection date against your Invoice Due Date Calculator and review overdue balances using Accounts Receivable Aging. The Cash Flow Calculator can place the advance and reserve settlement in separate periods. Days Sales Outstanding gives a broader collection-cycle view, but does not tell you a specific customer’s payment date.
When comparing factoring with a credit line, compare cash received on day one, all charges, repayment or settlement dates, and the effect of customer nonpayment. The simple annualized fee / advance can help make a short period visible, but it is not a substitute for a like-for-like financing quote. Do not infer that the model determines whether factoring is cheaper or appropriate for your business.
Assumptions and limitations
- The invoice factoring calculator assumes a single invoice, full collection after the entered whole number of days, and one initial advance.
- The time-based percentage applies to face value and accrues simply at days ÷ 30. Contracts may use the advance, a minimum, a step fee, or calendar months instead.
- Fixed charges are added once. There is no compounding, tax calculation, foreign exchange, default, dispute, partial payment, or chargeback model.
- Advance rate can range from 0% to 100%. A zero advance makes the annualized fee / advance undefined; the other cash-flow results still calculate.
- Currency selection changes formatting only. All amounts must already use one currency.
- Payment amounts are displayed at the selected currency’s usual precision; real settlement and rounding terms may differ.
Use the invoice factoring calculator CSV to retain assumptions for review in a spreadsheet. Print / save PDF opens the browser print dialog. Obtain a written proposal and confirm fees, recourse, reserve release and settlement timing before making a financial decision.
Invoice factoring calculator FAQs
What is an advance rate?
It is the percentage of the invoice paid upfront under the modeled arrangement. The rest is initially held as reserve.
Is the reserve a fee?
No. It is an initially withheld amount. This model deducts fees from it after customer payment, with any remaining balance settled with the business.
What if fees exceed the reserve?
The result shows a negative settlement. That signals a potential amount owed separately under this model; a provider’s actual collection method can differ.
Does this calculate an APR?
No. It offers a simple annualized fee-to-advance comparison, without APR rules, compounding, cash-flow timing adjustments or other contract terms.
Can I use 100% advance?
Yes. The reserve becomes zero and modeled fees produce a negative later settlement. Some providers deduct fees from the upfront transfer instead.
What if my fee is a flat percentage?
The calculator assumes a rate per 30 days prorated by days. For a one-time flat fee, enter a zero rate and put the quoted fee in Additional fixed fee.