You see an advertised mortgage rate online and call to lock it in, only to hear your actual rate is higher. You're not being baited-and-switched; you're meeting the reality of layered risk pricing. Lenders publish a base rate tied to the bond market, then adjust it up or down based on your specific loan profile. Two borrowers locking the same day can easily see a half-point spread or more.
The base rate is just the starting line
Every mortgage starts with a par rate—the rate at which the lender neither pays you a credit nor charges discount points. That par rate fluctuates daily with investor appetite for mortgage-backed securities. But it assumes a best-case borrower: 740+ credit score, single-family primary residence, conventional loan under conforming limits, 20 percent down, full documentation. Deviate from that profile and the lender adds loan-level price adjustments (LLPAs) to cover the higher default or prepayment risk.
Credit score is the heaviest lever
Fannie Mae and Freddie Mac publish LLPA grids that price risk in quarter-point increments. A borrower with a 780 score and 25 percent down might pay zero adjustment. Drop that score to 680 with the same down payment and the hit can be 1.5 to 2.0 percentage points in rate or upfront cost. FHA loans have their own pricing but follow a similar pattern. Credit score drives more of the final rate than any other single factor.
Loan-to-value compounds the effect
Put down 20 percent and your adjustment is modest. Put down 5 percent and you stack a larger LLPA on top of the credit-score hit. A 95 percent LTV conventional loan also triggers private mortgage insurance, which itself varies by credit score. These figures are illustrative; rates and products are subject to change and this is not a commitment to lend. The result: a borrower with a 680 score and 5 percent down can face a combined pricing impact two full points higher than a 780-score, 25-percent-down buyer locking the same base rate.
Property type, occupancy, and loan purpose matter too
Investment properties carry heavier adjustments than primary residences. Condos price worse than single-family homes. Cash-out refinances cost more than rate-and-term refis. Manufactured homes, high-balance loans, and non-warrantable condos each add their own layers. These aren't arbitrary penalties—they reflect decades of loss data showing which loan types default or prepay at higher rates.
The Alliance take
Layered pricing isn't a secret, but it's rarely explained up front. Understanding the adjustment grid helps you see where you have leverage: bump your credit score twenty points, increase your down payment by five percent, or switch from cash-out to rate-and-term, and you can often move into a cheaper pricing bucket. At Alliance we price your exact scenario before you waste time chasing an advertised rate that was never available to you. If you're ready to see your real number, start an application and we'll show you the full pricing stack in plain English.