The short version
- Repair revenue and merchant-account card volume are not the same number.
- A supplement can change carrier payment, customer responsibility, both, or neither.
- The payment request should follow the latest authorized payer breakdown.
- Examples are useful only when every assumption is labeled.
A body shop can write a large repair order and still process only a fraction of it by card. That makes generic processing examples especially misleading for collision work. The amount that matters is settled card volume: deductibles, customer-pay repairs, deposits, excluded work, and other balances actually run through the merchant account.
The cleanest review follows the money from the first estimate through the final supplement. It does not assume who pays. It records who is responsible, how that party pays, and what changed along the way.
Put each collected dollar in the right bucket
Only settled card transactions belong in the denominator when calculating an effective processing rate. A shop that divides the processing bill by total repair sales will make the rate look lower than it is. A shop that treats all repair revenue as future card volume will overstate the dollar opportunity.
Use the merchant statement as the control total, then reconcile it to repair-order collections. The exercise often uncovers duplicate entries, deposits posted in a different month, refunds, and payment links that were not tied cleanly to the final invoice.
- Carrier-paid by check or electronic transfer.
- Customer deductible paid by card.
- Customer deductible paid by cash, check, or another non-card method.
- Customer-pay repair, betterment, excluded operation, or upgrade.
- Uncollected amount, account billing, financing, or other receivable.
A supplement can move the balance in several directions
Additional damage may increase the carrier payment while leaving the deductible unchanged. An excluded item or customer upgrade may increase the customer's balance. A prior deposit may reduce the final collection. None of those outcomes should be guessed from the total supplement amount.
Before requesting payment, update the repair order and customer authorization. The final request should state what the customer is paying now and how earlier deposits were applied. If two prices are offered, the customer should see the current card and cash amounts before choosing.
A labeled example shows why the split matters
Assume a shop records $120,000 in monthly repair revenue. Carrier checks and electronic payments account for $66,000. Customers pay $48,000 by card and $6,000 by cash or check. At a 3.5% effective rate, the card-processing cost is $1,680 for that month.
Multiplying 3.5% by the entire $120,000 would produce $4,200, which is not the processing bill in this example because most of those dollars never touched the card account. The example is not an industry benchmark. Its purpose is to show which number belongs in the calculation.
Deposits and refunds can cross statement periods
A deposit may settle in one month and the completed repair in another. A later refund or partial reversal can appear in a third. Compare a few complete months when work in process is material, and do not count the same deposit again as part of the final card collection.
Keep the original transaction reference, refund amount, date, reason, customer communication, and revised invoice. The record helps accounting and gives the shop a coherent answer if the customer later questions the charge.
Use the payer map to compare processing offers
Once the shop knows its actual card mix, compare flat rate, interchange plus, and an approved dual-pricing proposal against the same twelve-month volume. Add monthly and per-transaction charges, gateway costs, debit treatment, equipment terms, chargeback fees, and any cost attached to remote payments.
The best result is not automatically the proposal with the most dramatic headline. It is the option the shop can explain, operate, reconcile, and leave without a penalty if it does not fit.
Questions business owners ask
Does a higher supplement always mean a higher card fee?
No. The effect depends on who pays the added amount and how that payment is collected. A carrier check does not create card-processing cost.
Where should a deductible paid by check appear?
It belongs in customer collections, but not in merchant-account card volume. Keep it in the payer reconciliation so the final invoice still balances.
How many statements should a body shop compare?
Three complete recent statements are a useful starting point. More months may be appropriate when volume, insurer mix, refunds, or large work in process changes materially.
Primary sources
BlueFinch reviewed these sources on August 11, 2026. Payment rules and state requirements can change.
- National Association of Insurance Commissioners: Auto Insurance Shopping Tool
- Federal Trade Commission: Auto Repair Basics
- Visa: Resolve a Dispute
This page provides general business information, not legal, tax, or accounting advice.