When you see a mortgage rate advertised, that number applies to a very specific borrower in a very specific situation. Change one variable — your credit score, your down payment, the property type, the loan program — and the rate changes with it.
Most lenders do not walk you through why your rate is what it is. This post does. Understanding what drives your rate is the first step to improving it.
Before your individual profile enters the picture, mortgage rates move based on macroeconomic conditions — primarily the bond market and specifically the yield on 10-year U.S. Treasury notes. When Treasury yields rise, mortgage rates tend to follow. When they fall, rates often ease.
The Federal Reserve's benchmark rate does not directly set mortgage rates, but Fed policy signals influence bond markets, which influence mortgage pricing. This is why rates can move on a single economic report — inflation data, jobs numbers, or Fed commentary can shift bond yields and move mortgage rates the same day.
You cannot control the macro environment. You can control the borrower-specific factors that sit on top of it.
Your credit score is the single most impactful variable within your control. Lenders use a risk-based pricing model called loan-level price adjustments (LLPAs) that assigns pricing hits or credits based on credit score bands. The difference between a 699 and a 700 credit score can be a meaningful rate adjustment. The difference between 680 and 760 can be half a point or more in rate.
If your score is within 20–30 points of a pricing tier boundary, it is worth talking to your broker about whether credit optimization before application could meaningfully improve your rate.
Loan-to-value ratio (LTV) is your loan amount as a percentage of the property value. A $380,000 loan on a $400,000 home is 95% LTV. The same loan with 20% down is 80% LTV. Lower LTV means less risk to the lender, which means better pricing.
LTV pricing adjustments interact with credit score adjustments — a 680 credit score at 95% LTV carries compounding risk adjustments that can push the rate significantly above the headline number. The same borrower at 80% LTV sees substantially lower adjustments.
For conventional loans, hitting 80% LTV eliminates PMI and improves pricing simultaneously. For borrowers who cannot get to 80%, FHA pricing may actually be more competitive at lower credit scores despite the MIP requirement.
Different loan programs are priced differently because they carry different risk profiles and are backed by different entities.
The property you are buying also affects your rate. Lenders price differently based on:
Above all borrower-specific factors sits one more variable: which lender is pricing your loan and on what day. Wholesale lenders update their rate sheets daily, sometimes multiple times per day based on bond market movement. A loan priced on a Tuesday morning may be different from the same loan priced Tuesday afternoon.
This is why broker access to multiple lender rate sheets matters. Zurn Mortgages pulls pricing from UWM, Rocket Pro, and Dart Bank simultaneously — the best execution on a given day wins. A single-lender institution cannot replicate this. You can learn more about the broker advantage on the About page.
The practical implication: when you are ready to lock your rate, timing within a day can matter. Your broker should be monitoring market conditions and advising you on lock timing — not just quoting you a rate and moving on.
Knowing what moves your rate gives you levers to pull before you apply:
A free quote from Zurn Mortgages shows you real wholesale pricing for your specific profile. No credit pull required for the initial conversation — use the mortgage calculator to model different scenarios before you call.
Disclosure: Alexander Zurn is a licensed mortgage broker in Pennsylvania (NMLS #1753707, Company NMLS #2462161). This article is for educational purposes only and does not constitute a commitment to lend. All loans subject to credit approval. Equal Housing Opportunity.
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