"A supplement after payment: calculate only the new customer balance"
"Source","https://bluefinchadvisors.com/blog/collision-supplement-after-payment-customer-balance"
"Basis","This planning scenario uses the values entered. It is not an industry benchmark or a quote."

"Inputs","Value","Unit"
"Revised approved invoice total","10600","currency"
"Current confirmed carrier responsibility","8800","currency"
"Current authorized customer responsibility","1800","currency"
"Carrier payments already collected","6500","currency"
"Customer payments already collected","1500","currency"

"Results","Value","Unit"
"Allocation difference","0","currency"
"New customer balance","300","currency"
"Carrier balance remaining","2300","currency"

"Calculation detail","Value","Unit"
"Combined confirmed allocation","10600","currency"
"Payments already collected","8000","currency"
"Total invoice balance","2600","currency"

"Assumptions"
"All defaults are illustrative. Carrier and customer totals are confirmed allocations, not assumptions about coverage."
"All amounts use the same invoice version and price basis."
"The calculator does not change deductibles or decide repair authorization or vehicle-release rights."

"Result notes"
"A zero allocation difference does not prove approvals or coverage; verify the supporting records."
"Cancel stale payment requests and check for an existing collection before sending a revised link."

"Sources"
"Progressive: Car repair estimate and payment questions","https://www.progressive.com/claims/faq/repair-estimates/"
"California BAR: Write It Right","https://www.bar.ca.gov/wir"
"Visa: U.S. merchant surcharge questions and answers","https://usa.visa.com/dam/VCOM/global/support-legal/documents/merchant-surcharging-qa-for-web.pdf"
"Stripe: Place a hold on a payment method","https://docs.stripe.com/payments/place-a-hold-on-a-payment-method"
"Stripe: Refund and cancel payments","https://docs.stripe.com/refunds"