The Quick Read: Blended cost is the all-in price of your new money measured against the debt you are replacing. On a jumbo cash-out, the new loan reprices your entire balance, not only the cash you take. So you compare the whole old setup against the whole new one, after points and fees, over the years you expect to keep the loan.
Here is the catch. “Blended cost” is not an official term. No regulator defines it. It is a practical yardstick, and this article defines it plainly so you can use it.
Key Takeaways
- A cash-out refinance replaces your first mortgage. A second lien keeps it and adds new debt beside it.
- Blended cost folds in the new loan’s rate, points, fees, any second lien you keep, and the old loan you give up.
- A simple average of two rates is wrong. Balances must weight each rate.
- A W-2 paycheck helps, but income still has to be documented and the full file reviewed.
Key Terms Defined
Blended cost: The all-in price of the new money compared with the debt it replaces, counting rate, points, fees and any loan that stays in place.
Blended rate: The weighted-average interest rate across two or more loans, with each rate weighted by its balance.
CLTV (combined loan-to-value): The new loan plus any second lien that remains, divided by the appraised value.
Jumbo loan: A loan that begins one dollar above the county’s conforming limit.
Repricing: Replacing an old loan with a new one, so every dollar of the balance takes the new terms.
Reserves: Cash or liquid assets left after closing, counted in months of your full payment.
What Does “Blended Cost” Actually Mean?
Blended cost answers one question: what does my money cost me after this refinance, compared with before? The answer has four parts: the rate on the new loan, the points and fees, any second lien that stays, and the old low-rate first mortgage you give up.
That last piece gets missed most often. A cheap legacy first mortgage is an asset. When a cash-out replaces it, every dollar of that balance moves to new terms. The new rate can look fine on its own and still raise what your household pays for money overall.
The reverse also happens. The federal consumer-finance regulator’s research notes that a cash-out replaces the original mortgage, while home equity loans and HELOCs leave it in place. It also treats a refinance as cash-out when the new loan plus junior liens runs more than 5% above the loans it replaces. And that same research shows borrowers often use proceeds to pay down other debt, such as credit cards and auto loans. Retire expensive debt with the cash, and your all-in cost can fall.
How Do You Calculate It, Step by Step?
The formula is a weighted average. Multiply each balance by its rate, add the results, then divide by the total balance. Don’t just average the two rates. A small loan at a high rate barely moves the result, and a big balance at a low rate dominates it.
Work it in five steps:
1. List every loan in the “before” setup: the first mortgage and any HELOC or second lien.
2. List every loan in the “after” setup. A cash-out has one new loan. A keep-the-first plan has two.
3. Weight each rate by its share of the total balance.
4. Add the points and fees to the new side. Financed costs raise the balance, which raises your CLTV.
5. Compare both sides on the same principal, over the years you expect to hold the loan.
Rate alone is not enough. The federal consumer-finance regulator explains that the interest rate excludes fees, while the APR includes points, broker fees and other charges. It also warns against comparing a closed-end loan’s APR with a HELOC’s APR, because the two are built differently. That caution matters when you blend a first mortgage with a HELOC.
A Worked Example for a W-2 Homeowner
Picture a salaried homeowner with a low-rate first mortgage and a home worth well above it. She wants cash for a renovation. Run the numbers on her options, using modeled assumptions rather than real market data.
Path one: the jumbo cash-out. One new loan pays off the first mortgage, covers any financed costs, and puts cash in her hands. Her whole balance takes the new terms. Her cost of money is the new rate plus the drag of points and fees, spread over everything she owes.
Path two: keep the first and add a second lien. The legacy loan stays at its low rate. Only the new cash is priced at the higher second-lien terms. Her blended cost is a weighted average of the two.
Then split the new loan into three layers:
- The old balance, repriced.
- The fresh cash.
- Closing costs and points.
This layer view shows what the cash itself costs. If repricing the old balance adds most of the extra expense, you are paying a premium to borrow a modest amount. If she is replacing expensive debt, the picture flips.
How to read it: the winner is the path with the lower all-in cost over the years she will actually hold the loan. A path with a lower payment is not automatically the winner. A longer term can lower the payment and still raise lifetime cost.
Keep the First Mortgage or Replace It?
| Factor | Cash-out (replace) | Second lien (keep) |
|---|---|---|
| What gets repriced | Entire balance | Only the new money |
| Payments | One loan | Two loans |
| Upfront costs | On the whole new loan | On the second only |
| Main risk | Giving up a cheap first | Higher price on the new cash |
| Fits best when | Old debt costs more than new | Legacy first is a bargain |
Neither wins by default. This is a genuine toss-up until you run the weighted numbers. If your existing first is expensive, replacing it costs you little. If it is cheap, replacing it deserves hard scrutiny.
What Changes on a Jumbo?
A jumbo loan begins one dollar above the county’s conforming limit. The FHFA publishes those limits by county, and they differ by area and unit count. Don’t assume one national number.
Across the wholesale programs Lendmire places files with, the headline lane starts at a 660 decision score. Leverage reaches 90% on the top lane, though several lanes reach 89.99% CLTV and the rest stop at 80%. Loans run up to $5,000,000 on the largest lanes. Cash-out generally sits at lower leverage than purchase, and the largest lanes add a cash cap. These figures are subject to lender guidelines and full file review.
The structures vary. Fixed, adjustable and interest-only options exist. Interest-only lowers early payments but builds no principal, so it can mask a higher lifetime cost. Reserves are counted in months of your full payment and rise with the loan amount. Above a lane’s threshold amount, expect two appraisals.
Some borrowers split a jumbo into a conforming first plus a separate second lien. That makes the blend itself the central question. Weigh the two prices together, not each alone. Lendmire’s jumbo cash-out refinance program page lays out the lane options.
How Does a W-2 Paycheck Fit In?
A W-2 gives you a clean income story, but approval is not automatic, since the lender still verifies it. As a conventional benchmark only, Fannie Mae’s Selling Guide calls for a recent paystub and W-2s covering one or two years. Jumbo lenders set their own standards, and many ask for similar documents.
Three points shape the result:
- Ratio after the reset. Your debt-to-income ratio is recalculated with the new payment. The ceiling is 50% on the fixed lanes, 45% on the adjustable lane and 43% on the interest-only lanes.
- Variable pay. Bonus and commission need a history. A declining trend can shrink the income a lender counts.
- Reserves. Months of payment in the bank matter more as the loan grows.
In practice, files with large bonus income often hinge on how the lender averages that pay. A borrower who expects bonus income to count should line up two years of documents before applying. The stronger files also show reserves beyond the minimum.
Cash-out files also tend to come down to appraised value. The appraisal sets your CLTV, and your CLTV gates the lane.
Fees, Term and Holding Period
Points and fees raise your blended figure, and financing them raises your balance. Lender guidelines for conventional cash-out, such as the Fannie Mae Selling Guide, allow closing costs and points to be financed. That is a benchmark for how conventional works, not a rule jumbo loans follow. Either way, financed costs accrue interest too.
Use a break-even method. Take the extra upfront cost, divide it by the monthly savings in cost of money, and you get the months needed to recover it. If you might sell or refinance before then, the deal loses. Costs vary by lender and loan size, so compare them on the Loan Estimate rather than guessing.
Watch the term reset. A new 30-year clock can shrink the payment while raising total interest paid. Compare total cost, not payment alone.
One more point: a cash-out on your primary home carries a right of rescission, a short window after closing when you can cancel. Funds are not released until it ends. This right does not extend to second homes.
The CFPB also notes that turning non-mortgage debt into mortgage debt puts your home at risk if payments become unsustainable. Defaulting on a credit card does not cost you the house. Defaulting on a mortgage can.
Common Mistakes
- Averaging two rates without weighting by balance.
- Comparing loans of different sizes as if they were equal.
- Ignoring points and fees.
- Treating a lower payment as a lower cost.
- Giving up a cheap first mortgage without pricing what it was worth.
Cash-Out or Second Lien? A Decision Checklist
A cash-out fits if:
- Your current first mortgage is no cheaper than the new loan.
- You are paying off higher-cost debt with the proceeds.
- You want one loan and one payment.
- You plan to hold the loan past your break-even point.
A second lien fits if:
- Your legacy first is a bargain you want to protect.
- You need a modest amount of cash.
- You may sell or refinance before costs are recovered.
If the home is a second home or rental, leverage drops, because occupancy sets the leverage on each lane. Taxes are a separate question. Tax treatment can depend on your situation; borrowers should speak with a qualified tax professional before relying on any deduction or credit.
Frequently Asked Questions
What is blended cost on a jumbo cash-out?
It is the all-in cost of your new money compared with the debt it replaces. It counts the new rate, points, fees, any second lien that stays, and the old low-rate first you give up. It is a practical measure, not a regulator-defined one.
Why can’t I just average the two rates?
Because the balances differ. A large low-rate balance should pull the result down far more than a small high-rate one. Weight each rate by its share of the total balance, then add them up.
Does a cash-out reprice my whole balance?
Yes. A cash-out replaces your first mortgage, so every dollar moves to the new terms. A second lien reprices only the new money and leaves the first alone.
Is blended rate the same as APR?
No. A blended rate is a weighted average of interest rates. The APR folds in points, broker fees and other charges on a single loan. Compare APRs only between similar loan types, since a HELOC’s APR leaves out fees.
Can I avoid a jumbo by splitting the loan?
Sometimes. Keeping a first loan at or under the county limit and adding a separate second lien can avoid jumbo status. You then blend two prices instead of facing one. Qualification, pricing and lender guidelines differ for each piece, so run both versions.
If you are weighing a cash-out refinance against keeping the loan you have, Lendmire can help you compare the programs and the equity each one reaches. Every figure here is subject to lender guidelines and full file review, and nothing is a commitment to lend. Whichever way the weighted math lands, the honest answer comes from putting the old setup and the new one side by side on the same balance.
For your own numbers, request a scenario review with Lendmire.
About Lendmire
Lendmire — NMLS# 2371349 — is a mortgage broker that arranges FHA, VA, conventional and jumbo home purchase and refinance financing in 16 states through wholesale lenders. Every option is subject to the lender’s guidelines and full underwriting. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.
For the program’s current guidelines, see jumbo loan programs.
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References
1. CFPB – Office of Research blog on cash-out refinances
2. CFPB – Mortgage interest rate vs APR
3. FHFA – Conforming Loan Limit values
4. Fannie Mae Selling Guide B3-3.2-01
5. Fannie Mae Selling Guide B2-1.3-03
This article is part of Lendmire’s Jumbo Loans series — every loan program’s qualification details, guidelines, and scenarios live on the loan options page.
Related reading: How to Pick the Jumbo Cash-Out Lane as a High-Earning W-2 Homeowner · Jumbo Cash-Out vs High-Balance for a Homeowner Near the Limit · Jumbo Cash-Out vs High-Balance Cash-Out for a High-Earning W-2 Homeowner
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
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Important disclosures. Lendmire (NMLS# 2371349) is a licensed mortgage brokerage. Lendmire is not a direct lender, depository institution, or financial advisor. All loan inquiries are subject to lender underwriting; this article does not constitute a commitment to lend. Rates, terms, and program guidelines are subject to change without notice and vary by borrower profile, property type, and state. Information in this article is general in nature and is not financial, legal, or tax advice. Equal Housing Opportunity. NMLS Consumer Access: nmlsconsumeraccess.org.