Why do lenders quote different rates for the same borrower?

It is tempting to assume a rate quote reflects some objective assessment of you. Mostly it does not. Your risk profile is priced by a published grid that every lender uses. What varies is what happens on top of that.

Four things that differ

• Margin. Every lender adds their own profit to the base cost of the money. This is a business decision, and it varies more than borrowers expect.
• Cost structure. A lender with heavy advertising spend or an expensive branch network has to recover that somewhere, and it is recovered in your pricing.
• How compensation is split. Two lenders can charge exactly the same total and present it completely differently — one as a low rate with high fees, the other as a high rate with none. Comparing on rate alone rewards the one who hid it better.
• Appetite. Lenders price aggressively where they want volume and back off where they do not. The same lender can be the cheapest option for one loan type and uncompetitive for another.

What this means for shopping

The spread between the best and worst quote for one borrower on one day is routinely large enough to matter over a loan’s life. It is also not predictable from brand: the cheapest lender for your specific profile is not reliably the biggest name or the one advertising most.

Comparing properly means holding everything constant — same loan amount, same product, same lock period, same day — and then comparing rate, points and lender fees together rather than any one of them alone.