Mortgage rates explained —
what moves them and what you control.

What a mortgage rate actually is

A mortgage interest rate is the annual cost of borrowing the principal loan amount, expressed as a percentage. On a $400,000 loan at 7%, the annual interest cost is $28,000 — or about $2,333 per month in interest alone during the early years of a 30-year loan.

Interest is not flat — it is calculated on the remaining balance. Early payments are mostly interest. Late payments are mostly principal. This is amortization. Over a 30-year loan, a borrower at 7% will pay roughly $558,000 in interest on a $400,000 loan — more than the original loan amount itself.

The rate matters. But it is not the only thing that matters. Fees, points, mortgage insurance, and the total cost of the loan over your actual hold period are equally important — and all of them interact with the rate.

What moves mortgage rates — and what does not

Most borrowers believe mortgage rates follow the Federal Funds Rate. They do not — at least not directly. The Fed Funds Rate controls short-term borrowing costs between banks. Mortgage rates are long-term instruments, and they track the 10-year Treasury yield much more closely.

What mortgage rates actually follow

Illustrative correlation — not a formula. Multiple factors influence rate movement simultaneously.

The spread problem

Mortgage rates are not the same as Treasury yields. They are always higher — by a spread. That spread compensates lenders and mortgage-backed security investors for prepayment risk, default risk, and the complexity of securitization. When markets are uncertain or lender capacity is constrained, that spread widens. This is why mortgage rates sometimes rise even when Treasuries fall.

Why the Fed rate cut did not lower your mortgage rate

This confuses borrowers constantly. When the Fed cuts the Federal Funds Rate, it directly lowers rates on home equity lines, credit cards, and short-term loans. It does not directly lower 30-year fixed mortgage rates. Mortgage rates may actually rise in the days following a Fed cut if bond markets read the cut as inflationary. The relationship is indirect and often counterintuitive.

The four things you can actually influence

You cannot control the 10-year Treasury. You can control your credit profile, your down payment, your point structure, and when you lock. These four levers move your actual rate more than market timing in most scenarios.

Loan-Level Price Adjustments — the hidden rate layers

Loan-Level Price Adjustments (LLPAs) are pricing adjustments applied by Fannie Mae and Freddie Mac to conventional loans based on risk factors in the file. They are expressed as fractions of a point and they stack — meaning multiple factors each add their own adjustment to the base rate.

LLPAs are one of the most important things to understand when comparing mortgage quotes. A rate that looks competitive at first glance may reflect a file with minimal LLPA exposure. Your file — with its specific credit score, LTV, property type, and occupancy — may price differently.

Factors that trigger LLPAs on conventional loans

• Credit score — adjustments begin at every 20-point threshold; largest jumps are below 700 and below 680
• LTV ratio — higher LTV = higher adjustment; the 80% threshold is significant
• Occupancy — investment properties carry a significant premium over primary residences
• Property type — condominiums, 2-4 unit properties, and manufactured homes each carry specific adjustments
• Loan purpose — cash-out refinances carry higher LLPAs than purchase or rate-and-term refinances
• Debt-to-income ratio — high DTI ratios (above 40%) add an LLPA on some loan structures
• Fixed vs. adjustable rate — adjustable-rate mortgages (ARMs) carry their own LLPA structure separate from fixed-rate pricing; a 5/1 or 7/1 ARM is not automatically cheaper than a 30-year fixed once adjustments are applied — the comparison depends on the full file profile
• Loan term — the term you choose affects both the base rate and LLPA exposure. A 15-year fixed typically prices 0.5–0.75% below a 30-year fixed and carries more favorable LLPA treatment. A 20-year sits between the two. Shorter terms reduce total interest dramatically but increase the monthly payment — the right term depends on payment capacity and hold period, not just rate

Fixed vs. adjustable — the LLPA and pricing difference

Adjustable-rate mortgages (ARMs) have a fixed initial period — typically 5, 7, or 10 years — before the rate adjusts annually based on an index plus a margin. An ARM is not inherently cheaper than a fixed-rate loan when LLPAs and total cost are included. In some file profiles, the ARM actually prices similarly to a 30-year fixed after adjustments. The ARM makes the most sense when you have high confidence you will sell or refinance before the adjustment period begins — and you are not relying on assumed lower payments that may not materialize.

Buying down the rate vs. taking a lender credit

This is a cost-structure decision, not a rate decision. You can pay to lower your rate (points) or accept a higher rate in exchange for cash back toward closing costs (lender credit). The loan itself is the same — only the shape of the total cost changes.

The break-even calculation

To evaluate whether buying down the rate makes sense: divide the upfront cost of the points by the monthly payment savings. The result is the number of months until break-even. If you plan to hold the loan longer than that break-even period, buying down is financially advantageous. If not, it is not.

Example: paying $4,000 in points to save $80/month breaks even in 50 months — just over 4 years. If you plan to stay 7+ years, the buydown is a good investment. If you expect to sell or refinance in 3 years, you lose money on the points.

Use our refinance break-even calculator to model your specific scenario before deciding.

The difference between interest rate and APR

The interest rate is the cost of borrowing the principal — what determines your monthly payment. The Annual Percentage Rate (APR) includes the interest rate plus most fees expressed as an annualized cost of the loan. APR is designed to make loans comparable across different fee structures.

APR is a useful comparison tool — a loan with a lower rate but high fees may have a higher APR than a loan with a slightly higher rate but minimal fees. However, APR assumes you hold the loan to maturity. For borrowers who sell or refinance before the loan pays off, the APR comparison may not reflect the actual cost of the shorter hold period.

Rate locks — what they are and how to use them

A rate lock is an agreement with the lender to hold a specific rate for a defined period — typically 30, 45, or 60 days — while your loan is processed. During the lock period, your rate does not change even if market rates move.

Lock period rules

• Longer locks cost more — a 60-day lock is priced higher than a 30-day lock because the lender carries more market risk during the extended period
• Lock before a volatile event — major economic reports (jobs, CPI, Fed decisions) can move rates by 0.25-0.5% in a single day; locking before a risky event eliminates that exposure
• Expiring locks — if your closing extends beyond the lock period, you either pay to extend or take the current market rate, whichever is worse for you (most lock extension agreements favor the lender)
• Float-down options — some lenders offer a float-down provision that lets you take a lower rate if rates fall after you lock, at a cost. They are rarely free and the terms vary significantly

Mortgage rate questions