Invoice Factoring Cost Calculator

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Table of contents

• How to use
• Common mistakes
• Definitions
• Methodology
• Limitations & assumptions
• Sources

Invoice amount: The face value of the invoice being factored before fees are taken out.

Factoring: A financing arrangement where a business sells or assigns an invoice or receivable to a factor and receives cash sooner than waiting for the customer to pay.

Advance rate: The percent of the invoice paid upfront as Cash advance today.

Factoring fee per 30 days: The fee rate charged for each 30-day period the invoice is outstanding.

Reserve: The part of the invoice not paid upfront. It is held back until the customer pays, then reduced by fees.

All-in factoring cost: The factoring fee used after any minimum fee rule, plus fixed extra fees entered by the user.

Annualized cost compared with advance: A simple yearly rate based on the total cost, the cash advanced, and the number of days outstanding. It is for comparison, not a formal loan APR.

Mistake: Entering the invoice balance after fees in Invoice amount .
Fix: Use the full invoice face value before any factoring fee, reserve holdback, or extra charge.

Mistake: Typing a yearly rate into Factoring fee per 30 days .
Fix: Enter the rate charged for each 30-day period, such as 3 for 3 percent per 30 days.

Mistake: Using the invoice due date number in Days until customer pays instead of the expected wait from today.
Fix: Count the days from the advance date until the customer is expected to pay the factor.

Mistake: Leaving known wire, service, or platform charges out of Fixed extra fees .
Fix: Add the dollar total of one-time fees tied to this invoice so All-in factoring cost is not understated.

Mistake: Ignoring a quoted minimum charge in Minimum factoring fee .
Fix: Enter the minimum dollar fee if one applies; the calculator uses the larger of the minimum and the time-based fee.

Mistake: Treating a negative Reserve paid later after fees as a calculator error.
Fix: Read it as a warning that the included fees are larger than the held-back reserve, so the later payment may be zero or you may owe extra.

• The estimate covers one invoice and assumes one advance, one customer payment date, and a flat fee rate per 30 days.
• The calculator includes only the fixed extra fees and minimum factoring fee you enter. It does not know about undisclosed charges, tiered fees, dispute fees, chargebacks, collections costs, or reserve adjustments.
• The annualized cost is a simple comparison rate using 365 days. It is not a legal APR calculation and may not match lender disclosures.
• If the customer pays earlier or later than the Days until customer pays input, the fee and annualized cost can change.
• A negative reserve result is left negative on purpose. Real factoring agreements may instead show no later payment, an offset, or an amount due from you.
• Taxes, accounting treatment, customer disputes, recourse obligations, and contract details are outside this calculator.

Calculation steps

The calculator first finds the upfront advance from the invoice amount and advance rate.

cash_advance_today = invoice_amount * advance_rate_percent / 100

It then calculates the time-based factoring fee using the quoted fee per 30 days and the expected days until the customer pays.

time_based_factoring_fee = invoice_amount * fee_rate_30_percent / 100 * days_to_pay / 30

If a minimum factoring fee is entered, the fee used is the larger of the time-based fee and the minimum fee.

factoring_fee_used = max(time_based_factoring_fee, minimum_factoring_fee)

The all-in factoring cost adds any fixed extra fees to the fee used.

all_in_factoring_cost = factoring_fee_used + fixed_extra_fees

The later reserve payment is the invoice amount minus the cash advance and all-in cost. The calculator does not force this value to zero, because a negative value tells you the included fees are larger than the held-back reserve.

reserve_paid_later_after_fees = invoice_amount - cash_advance_today - all_in_factoring_cost

Total net cash is the upfront cash plus the later reserve payment. This is the same as invoice amount minus all-in factoring cost.

total_net_cash_after_fees = cash_advance_today + reserve_paid_later_after_fees

The cost percent divides the all-in cost by the invoice amount.

cost_percent_of_invoice = all_in_factoring_cost / invoice_amount * 100

The annualized comparison divides the all-in cost by the cash advance, scales it to a 365-day year, and adjusts for the number of days outstanding.

annualized_cost_on_advance = all_in_factoring_cost / cash_advance_today * 365 / days_to_pay * 100

Mini example

For a $10,000 invoice, 85 percent advance rate, 3 percent fee per 30 days, and 45 days to pay, the cash advance is $8,500.

10000 * 85 / 100 = 8500

The time-based fee is $450.

10000 * 3 / 100 * 45 / 30 = 450

With no extra fees and no minimum fee, the all-in factoring cost is $450, total net cash after fees is $9,550, and reserve paid later after fees is $1,050.