Reverse Payment Fee Calculator

The algebra behind 'grossing up' an invoice

The core trap is that percentage fees compound: adding 2.9% on top of your net does not cover the fee charged on the gross amount. The correct derivation treats the fee as applying to the final gross: net = gross − (gross × percent) − fixed. Solving for gross gives gross = (net + fixed) ÷ (1 − percent/100). The fixed fee goes on top before the division because the processor charges it as a flat amount on the whole transaction. For $100 net on Stripe: (100 + 0.30) ÷ 0.971 = $103.30 gross, and the processor takes $3.30, leaving exactly $100. The intuition check most people miss: the fee percentage applies to the larger gross figure, which is why simply multiplying your net by 1.029 under-recovers by a few cents on every invoice — small per transaction, but it compounds into hundreds of dollars annually for busy freelancers.

Processor presets and custom fee structures

The tool ships with the fee structures freelancers actually encounter: Stripe's US standard 2.9% + 30¢, PayPal's US commercial rate of 3.49% + 49¢, PayPal's international transaction tier at 4.49% + 49¢, and a zero-fee baseline for bank transfers or processors like Wise. Every field is editable, because rates vary by country, plan and negotiated volume — enterprise Stripe agreements, nonprofit rates, and regional PayPal pricing all exist. Enter your actual statement terms once and the calculator reflects your real economics. Comparing presets side by side is instructive: on a $100 net invoice, PayPal's consumer-facing rate costs roughly 40 cents more than Stripe, and international tiers can cost double. The effective-rate readout — total fee as a percentage of your net — is the number to quote when a client asks why your invoice differs from your quote: 'it's the 3.23% processing pass-through' is a conversation that ends politely with this tool open.

Forward mode: verifying and reconciling deposits

The forward calculator runs the payment math as the processor does: given a gross invoice amount, apply the percentage, subtract the fixed fee, and show the exact net deposit plus the fee taken. This is the tool's verification face — compute a gross in reverse mode, paste it into forward mode, and confirm the round-trip lands on your intended net. It is also the reconciliation instrument for month-end bookkeeping: when your Stripe payout does not match the invoice total, forward mode shows precisely the fee amount that explains the difference, ready to categorize as an expense. Effective-rate comparison across gross sizes reveals a subtlety worth knowing: fixed fees hurt small invoices proportionally more — a 30¢ fixed fee on a $5 charge is 6% by itself. Many freelancers respond by setting minimum invoice amounts or consolidating micro-payments, and this tool quantifies exactly where those breakpoints should be.

Who eats the fee: the client conversation

Grossing up invoices is standard practice, but it deserves a one-line transparency note on the invoice itself — 'gross amount includes 3.0% payment processing' — which this tool's output makes effortless to justify. Some clients push back; the effective-rate display turns that negotiation into arithmetic rather than opinion. Three common arrangements exist: the vendor absorbs fees (price accordingly, using the effective rate to set your floor), the client pays the gross-up (this tool's headline use), or both parties split it (compute the gross for your half). There is also a compliance dimension in some jurisdictions: surcharging credit-card payments is regulated — a few US states restrict it, and Visa/Mastercard rules cap surcharges below 4% — while adding fees to bank transfers and ACH is generally freer. The calculator does not give legal advice, but by showing your effective rate it tells you whether your pass-through sits inside typical surcharge caps.

Step by step: how to use Reverse Fees

1. 1

   Enter the net amount you want to actually receive in your account after fees.

2. 2

   Pick a processor preset — Stripe US, PayPal US, PayPal international, or zero-fee bank transfer.

3. 3

   Need custom terms? Edit the percentage and fixed-fee fields to match your actual processor statement.

4. 4

   Read the result: the gross to invoice, the exact fee at that gross, and your effective rate as a percentage of net.

5. 5

   Verify with forward mode: paste the gross back in and confirm the net lands exactly on your target.

6. 6

   Copy the gross amount onto your invoice with a one-line processing note, or compare presets to pick the cheapest rail.

Frequently asked questions