What Determines Your Mortgage Rate? 8 Factors Explained

With rates matching their 2026 highs for the third time this year, the gap between the headline number and your actual quote is confusing more borrowers than usual. A mortgage rate isn't picked — it's built, layer by layer. Here is each layer, what it costs, and which ones you can still change.

TL;DR

• Your rate = market baseline + lender margin + risk adjustments. The baseline comes from the bond market. The adjustments come from your file.
• Credit score and LTV are the two biggest levers you control. On a conventional loan, moving from 660 to 780 FICO at 80% LTV cuts roughly 2 points in loan-level fees — worth around 0.375 to 0.625 percentage points in rate.
• Loan type matters as much as credit. FHA and VA price the same borrower very differently than conventional, especially below 680 FICO.
• Occupancy and property type are silent rate-raisers. Investment properties, second homes, condos above 60% LTV, and 2–4 unit properties all add fees.
• Headline rates assume a best-case file. Survey rates like Freddie Mac's weekly average reflect high-credit, high-down-payment borrowers and often include points.

How a rate is actually built

Every quote you receive is three stacked layers:

Layer 1 — the market baseline. Most 30-year fixed loans are pooled into mortgage-backed securities (MBS) and sold to investors. What investors will pay for those bonds on a given day sets the wholesale cost of money. MBS trade in relation to the 10-year Treasury yield, which is why mortgage rates track Treasuries — loosely.

Layer 2 — the spread and lender margin. Mortgage rates sit above the 10-year Treasury by a spread that covers prepayment risk, servicing, and the lender's operating margin. Historically that spread averaged roughly 1.7 percentage points; since 2022 it has run persistently wider, at times approaching 3 points. A wide spread means rates can stay high even when Treasuries dip — one reason 2026 rate movements have felt disconnected from bond headlines.

Layer 3 — risk adjustments for your file. This is where your quote diverges from your neighbor's. On conventional loans, Fannie Mae and Freddie Mac publish loan-level price adjustments (LLPAs) — fee grids keyed to credit score, LTV, occupancy, property type, and loan purpose. Lenders either charge those fees at closing or, far more commonly, absorb them into a higher rate. As a rough rule of thumb, 1 point in fees converts to about 0.25 percentage points in rate, though the exact trade varies daily.

You can't negotiate layers 1 and 3. You can shop layer 2 — which is why getting multiple quotes reliably saves money even though every lender uses the same LLPA grid.

The 8 factors at a glance

| # | Factor | Typical rate impact | Can you control it? | | --- | --- | --- | --- | | 1 | Credit score | 0 to ~0.75 pp between top and bottom conventional tiers | Yes, over months | | 2 | Down payment / LTV | 0 to ~0.50 pp across LTV bands | Yes, at application | | 3 | Loan type & term | FHA/VA vs conventional; 15 vs 30 year (~0.50–0.75 pp) | Yes | | 4 | Occupancy | Investment property adds ~0.50–0.875 pp | Sometimes | | 5 | Property type | Condo, 2–4 unit, manufactured each add fees | Sometimes | | 6 | Loan purpose | Cash-out refinance adds ~0.375–0.625 pp | Yes | | 7 | Points & lock choices | Each point bought lowers rate ~0.25 pp | Yes | | 8 | The market baseline & spread | Sets the floor for everyone | No |

Rate impacts are approximate conversions of published agency fee grids and vary by lender and day. The point is the ordering: the market sets the floor, and your file determines how far above the floor you land.

Factors 1–2: credit score and LTV — the LLPA grid

For conforming conventional loans, credit score and LTV interact on a single grid. Here are illustrative purchase LLPAs at 80% LTV, drawn from Fannie Mae's current matrix (fees shown as a percentage of the loan amount, rounded):

| Credit score | Approx. LLPA at 80% LTV | Approx. rate equivalent | | --- | --- | --- | | 780 and above | ~0.375% | ~0.09 pp | | 740–759 | ~0.875% | ~0.22 pp | | 700–719 | ~1.375% | ~0.34 pp | | 660–679 | ~2.250% | ~0.56 pp | | 620–639 | ~2.750% | ~0.69 pp |

Two things surprise borrowers here. First, the top tier now starts at 780 — a 765 score, excellent by most standards, does not get the best conventional pricing. Second, the penalty is steepest in the middle bands: the drop from 740 to 700 costs about as much as the drop from 780 to 740.

LTV cuts the other way. Fees generally peak in the 80–85% LTV range and ease at both very low and very high LTVs (high-LTV loans carry PMI, which shifts some risk off the agencies). Crossing a threshold matters: 80.01% LTV and 80.00% LTV can price meaningfully differently. If you're within a few thousand dollars of a band edge, ask your loan officer to price both scenarios. The full grid is published in Fannie Mae's LLPA matrix and mirrored by Freddie Mac; the FHFA sets the framework both operate under.

For a deeper look at score bands, see our credit score for mortgage guide.

Factors 3–6: loan type, occupancy, property, and purpose

Loan type. Conventional loans price off the LLPA grid above. FHA pricing is nearly flat across credit bands, which is why FHA frequently beats conventional for borrowers below about 680 — the trade-off is FHA's mortgage insurance structure. VA loans, backed by the Department of Veterans Affairs, typically carry the lowest rates of any major program because the government guarantee replaces the LLPA framework entirely. Jumbo loans — above the conforming limit you can check with our conforming limit lookup — price off each lender's own balance sheet and can land either above or below conforming rates depending on the bank's appetite.

Term. A 15-year fixed usually prices roughly 0.50 to 0.75 percentage points below a 30-year, because investors face less duration risk. Adjustable-rate mortgages price off a different part of the yield curve altogether.

Occupancy. Agencies charge investment properties roughly 2 to 4 points in LLPAs depending on LTV, and second homes a similar range at higher LTVs. In rate terms, expect an investment-property quote about 0.50 to 0.875 percentage points above an identical primary-residence loan.

Property type. Condos above 60% LTV, 2–4 unit properties, and manufactured homes each carry their own adjustment — typically in the 0.375 to 1.0 point range.

Purpose. A cash-out refinance adds fees across the entire grid — commonly 0.375 to 0.625 percentage points in rate versus a purchase or rate-and-term refinance for the same borrower.

Factor 7: the choices you make at pricing

Once your file is what it is, three decisions still move the number on your lock confirmation:

• Discount points. Paying 1% of the loan amount upfront typically buys the rate down about 0.25 percentage points, though the trade varies. Whether that's worth it depends entirely on how long you keep the loan — our discount points breakeven guide walks through the math.
• Lock period. A 60-day lock costs slightly more than a 30-day lock; a 15-day lock costs less. Extensions get expensive. See rate locks and float-downs for how to time it.
• Lender credits. The mirror image of points: accept a slightly higher rate and the lender pays part of your closing costs. Useful when cash to close is the binding constraint.

Factor 8: the baseline you can't control

The 10-year Treasury yield, the MBS market's appetite, and the spread between them set the floor under every quote in the country. Inflation data, Federal Reserve policy expectations, and Treasury issuance all move it daily. None of it responds to anything in your file.

The practical takeaway is not to forecast it — nobody quoting you a rate can reliably do that either — but to recognize what it means for shopping: on any single day, the baseline is identical for every lender. Differences between same-day quotes are entirely margin and pricing strategy, which makes same-day comparison shopping the one free lunch in mortgage pricing. The CFPB's research found borrowers who compare multiple lenders save meaningfully over the loan's life, and Freddie Mac's weekly survey is the standard reference for where the best-case baseline sits.

Worked example: two borrowers, same day, same lender

A hypothetical, but built from the real fee structure above. Both borrowers apply for a $400,000 conventional 30-year fixed purchase loan on the same morning, when the lender's par rate for a perfect file is 6.50%.

| | Borrower A | Borrower B | | --- | --- | --- | | Credit score | 785 | 665 | | Down payment | 25% (75% LTV) | 10% (90% LTV) | | Property | Single-family, primary | Condo, primary | | LLPAs (approx.) | ~0.125 points | ~3.0 points (score/LTV + condo) | | Rate-equivalent adjustment | ~0.03 pp | ~0.75 pp | | Quoted rate (no points) | ~6.53% | ~7.25% | | Monthly P&I | ~$2,527 | ~$2,729 |

Same market, same lender, same loan amount — a difference of roughly 0.72 percentage points and about $200 per month, driven entirely by file characteristics. Borrower B isn't being gouged; they're being priced off the same public grid as everyone else. Their real options: an FHA quote (flatter credit pricing), a larger down payment to cross the 85% or 80% LTV line, or a few months of credit repair before applying. Run your own payment scenarios with our affordability calculator.

What you can change before you apply

In rough order of impact per unit of effort:

1. Don't add new debt before the credit pull. A new car loan or a maxed card can drop you a full pricing band.
2. Pay revolving balances below 30% utilization — ideally below 10% — a month before applying. This is the fastest legitimate score lever.
3. Price both sides of an LTV threshold. If a slightly larger down payment crosses 90%, 85%, or 80% LTV, the fee drop can outweigh the extra cash.
4. Get quoted on more than one program. Below 680 FICO, always see the FHA number next to the conventional one.
5. Shop three to five lenders in the same week. Inquiries within the shopping window count as one, and margin differences of 0.25 percentage points between lenders are routine.

Sources & verification

• Fannie Mae Loan-Level Price Adjustment Matrix
• Freddie Mac Credit Fees (Exhibit 19)
• FHFA — regulator of Fannie Mae and Freddie Mac
• Freddie Mac Primary Mortgage Market Survey
• CFPB: Explore interest rates and shopping research
• VA home loan programs
• NMLS Consumer Access

Disclosure

MLO Finder is a directory of mortgage loan officers, not a lender. We don't originate loans, set rates, or guarantee approval. Verify any loan officer's current licensing through NMLS Consumer Access before working with them. Information here is educational and not personalized financial advice — consult a licensed loan officer or financial planner for guidance specific to your situation.