"Diagnostic fees credited to repairs: separate the discount from the payment"
"Source","https://bluefinchadvisors.com/blog/diagnostic-fee-credit-repair-invoice-balance"
"Basis","This planning scenario uses the values entered. It is not an industry benchmark or a quote."

"Inputs","Value","Unit"
"Diagnostic service charge","180","currency"
"Repair charge excluding diagnosis","1200","currency"
"Agreed repair discount","180","currency"
"Tax on the revised invoice","84","currency"
"Prior payment actually collected","180","currency"

"Results","Value","Unit"
"Revised invoice total","1284","currency"
"Balance still to collect","1104","currency"
"Price before entered tax","1200","currency"

"Calculation detail","Value","Unit"
"Diagnostic line","180","currency"
"Separate repair line","1200","currency"
"Agreed discount","180","currency"
"Tax entered","84","currency"
"Prior payment credit","180","currency"

"Assumptions"
"Defaults are examples. The repair amount excludes the diagnostic service listed separately."
"The authorized discount changes the price. The prior payment applies existing cash separately."
"Enter the actual tax and check how your accounting system transfers credits."

"Result notes"
"A negative balance stays visible so you can check for an overpayment or inconsistent inputs."
"The worksheet reconciles amounts; it doesn't decide whether a diagnostic discount or refund is owed."

"Sources"
"FTC: Auto Repair Basics","https://consumer.ftc.gov/articles/auto-repair-basics"
"California BAR: Write It Right","https://www.bar.ca.gov/wir"
"Stripe: Refund and cancel payments","https://docs.stripe.com/refunds"
"Stripe: Place a hold on a payment method","https://docs.stripe.com/payments/place-a-hold-on-a-payment-method"
"Visa: U.S. merchant surcharge questions and answers","https://usa.visa.com/dam/VCOM/global/support-legal/documents/merchant-surcharging-qa-for-web.pdf"