What it means
The term originated in United States mortgage lending, where lenders were required to give borrowers a standardised estimate of settlement costs within three business days of an application. The purpose was to make offers comparable, so a borrower could put two lenders side by side and see the real cost rather than just the headline interest rate.
Since 2015 the mortgage version has been replaced by the Loan Estimate, which serves the same function in a clearer format. The idea matters because the cost of a transaction is rarely one number.
A mortgage involves origination fees, underwriting charges, appraisal, title work, recording fees, prepaid interest and escrow deposits, and any of these can be quietly inflated. A written estimate forces the provider to commit to figures early and gives the customer evidence if the final bill differs materially.
The mechanism that gives the estimate teeth is the tolerance framework. Some charges, typically the lender's own fees, carry a zero tolerance and cannot increase at all; others, usually services the customer may shop for, may rise by up to 10% in aggregate; a third group, such as prepaid interest and insurance premiums, may vary freely because they depend on the closing date.
If a bucket exceeds its tolerance without a valid change of circumstance, the provider must refund the difference. The phrase now appears well beyond mortgages.
In United States healthcare, providers must give uninsured and self-paying patients a good faith estimate of expected charges before scheduled treatment, and contractors, lawyers and consultants often issue one voluntarily as a professional courtesy. The common principle is the same: a documented, honest projection of cost, given early enough to be useful.
In practice
Real-world examples.
Example
A first-time buyer collects good faith estimates from three lenders. Two quote similar interest rates, but one shows $2,400 more in origination and underwriting fees, which reveals that the apparently cheaper rate is being paid for through upfront costs.
Example
A self-paying patient books a scheduled procedure and receives a good faith estimate of $4,800 covering the surgeon, the facility and anaesthesia. The final bill arrives at $5,900, and the estimate gives the patient a documented basis on which to dispute the gap.
Example
A small business hires a consultancy for a systems review and receives a written estimate of $18,000, split between a fixed scoping phase and an hourly implementation phase. When the implementation runs long, the estimate makes the conversation about which assumption changed rather than an argument about the invoice.
Formula
Calculation
Total estimated cost = Zero-tolerance charges + Charges subject to a 10% tolerance + Charges that may vary freely
Allowed total for the 10% bucket = Estimated bucket total x 1.10
A buyer takes a $320,000 mortgage. The zero-tolerance lender charges are an origination fee of 1% and an underwriting fee of $995.
Origination fee = $320,000 x 1% = $3,200.
Zero-tolerance total = $3,200 + $995 = $4,195.
The services the borrower may shop for are a title search at $850, a recording fee at $250 and a survey at $400.
Shoppable bucket total = $850 + $250 + $400 = $1,500.
Total estimated closing costs = $4,195 + $1,500 = $5,695.
At closing, the shoppable charges actually come to $1,720. The permitted maximum is $1,500 x 1.10 = $1,650, so the excess is $1,720 - $1,650 = $70, which the lender must credit back to the borrower. The zero-tolerance items cannot rise at all, so if the underwriting fee had come in at $1,095 rather than $995, the full $100 increase would be refunded.Case study
Seen in the real world.
Cedar Point Lending is an invented mortgage provider used purely as an illustrative example. A fictional borrower applied for a $320,000 loan and received an estimate showing $4,195 of zero-tolerance lender fees and $1,500 of shoppable third-party services, a total of $5,695.
Between application and closing, the title company in this illustrative scenario raised its search fee and an additional recording charge appeared, taking the shoppable bucket to $1,720. Cedar Point checked whether a valid change of circumstance applied, concluded that none did, and credited the borrower $70 at closing, being the amount above the $1,650 tolerance limit.
The borrower's own view afterwards was that the $70 mattered far less than the comparison the estimate had made possible. Having three estimates in the same format had already saved several thousand dollars in fees on a rate that looked identical across all three lenders.
Watch out
Common mistakes.
- Treating the estimate as a guaranteed final bill. Several categories are genuinely variable, and only the zero-tolerance items are truly fixed at the quoted figure.
- Comparing only the interest rate between lenders. Fees can differ by thousands of dollars on the same nominal rate, which is precisely what the estimate is designed to reveal.
- Not asking for a revised estimate when circumstances change. A change of loan amount, property or product resets the baseline, and the borrower should get updated figures in writing.
Questions
People also ask.
Is a good faith estimate legally binding?
Not as a whole, but specific categories carry legal tolerances, and charges exceeding them without a valid reason must generally be refunded.
Does the good faith estimate still exist for mortgages?
The mortgage form was replaced by the Loan Estimate in 2015, though the phrase remains in common use and applies formally in healthcare settings.
How soon should I receive one?
For a mortgage application the standard is within three business days, and for scheduled healthcare it should arrive far enough ahead of treatment to allow a genuine decision.
From the founder's library
Take it further with the book.
Build your financial confidence beyond this definition. Shihan's full-length guide, Accounting Fundamentals, takes the same plain-English approach and turns it into a complete, practical playbook for non-finance managers, business owners and students - with chapter-end quiz answers and presentation slides included.
25% off with code MMHQ25, applied at checkout. Priced in USD - checkout may show the equivalent in your local currency.
View the book and save 25%Related