"Commercial window film: price a measured scope change before collection"
"Source","https://bluefinchadvisors.com/blog/commercial-window-film-measurement-change-payment"
"Basis","This planning scenario uses the values entered. It is not an industry benchmark or a quote."

"Inputs","Value","Unit"
"Originally quoted installed area, square feet","420","number"
"Approved measured installed area, square feet","480","number"
"Agreed installed-area selling rate","12","currency"
"Approved additional access charge","350","currency"
"Separate agreed price credit","120","currency"
"Payments already applied","1500","currency"

"Results","Value","Unit"
"Net scope adjustment","950","currency"
"Revised project amount","5990","currency"
"Revised unpaid balance","4490","currency"

"Calculation detail","Value","Unit"
"Original area-based quote","5040","currency"
"Area-only adjustment","720","currency"

"Assumptions"
"Starting values are examples, not market benchmarks or payment quotes."
"Use one currency and a consistent before-tax basis. Work out taxes and program-specific adjustments separately."

"Result notes"
"The original quote must match quoted area times the entered rate. Model complex mixed-rate quotations separately."
"This does not approve film-to-glass compatibility, building access, tax treatment, or a customer's authority to approve work."

"Sources"
"IWFA: film-to-glass compatibility and window-film FAQs","https://iwfa.com/faq/"
"Mastercard: merchant surcharge rules and debit exclusions","https://www.mastercard.us/en-us/business/overview/support/merchant-surcharge-rules.html"
"Visa: merchant fees, rules, and surcharge disclosure","https://usa.visa.com/support/small-business/regulations-fees.html"
"Stripe: refund destinations, partial refunds, and refund status","https://docs.stripe.com/refunds"
"3M: separate warranty resources for wrap, PPF, and window film","https://www.3m.com/3M/en_US/post-factory-installation-us/resources/warranties/"