Jumbo Loan Calculator
Check whether your loan is jumbo under your county's 2026 conforming limit, compare a 30-year fixed with a 40-year fixed with 10 years interest-only, and estimate the reserves you'll need after closing.
Get Started in 3 Steps
How to Use the Jumbo Loan Calculator
Pick your county and property
Choose Oregon or California, your county, and the number of units to load the 2026 conforming limit.
Enter price, program and down payment
Set the purchase price and choose standard jumbo (10% down) or VA or physician financing (0% down).
Compare payments and reserves
See whether the loan is jumbo, compare the 30-year fixed with the 40-year interest-only option, and review 6- and 12-month reserve estimates.
Jumbo Loan Calculator
Check your 2026 limit, compare payments, estimate reserves
Every Oregon county uses the same 2026 limit.
10% down, no hard cap
Illustrative rate as of October 2026. Tax defaults to 1.1% of price.
Is my loan jumbo?
2026 limit: $832,750
Jumbo loan
Loan amount $1,260,000. $427,250 above the $832,750 limit for this 1-unit property.
30-year fixed
$8,277
principal & interest / mo
$9,736 with taxes & insurance
40-year fixed · 10 yrs interest-only
$7,219
interest-only, years 1–10
$8,277 P&I, years 11–40
Same rate for all 40 years
Estimated reserves after closing
$58,414 6 months PITI
$116,828 12 months PITI
Most jumbo loans need 6–12 months. Retirement and brokerage accounts can count.
Best pricing at 740+. No autopay or banking relationship required.
How do I know if my loan is a jumbo loan?
Your loan is jumbo if it's above your county's 2026 conforming limit. In Oregon that's $832,750 in every county. In California it ranges from $832,750 to $1,249,125 depending on the county, and limits are higher for 2–4 unit properties. Lumen Mortgage offers jumbo loans with 10% down (0% for eligible VA and physician borrowers) and best pricing at 740+.
Best for: Buyers and homeowners in Oregon and California financing above the conforming limit
How It Works
Understanding the Jumbo Loan Calculator
This calculator answers three questions. First, is your loan jumbo? Pick your state, county and unit count, and it compares your loan amount with the 2026 conforming limit for that county. Loans above the national baseline but within a high-cost county's limit are high-balance conforming, not jumbo.
Second, what will it cost each month? It shows a 30-year fixed payment next to our 40-year fixed with 10 years interest-only. During years 1–10 you pay interest only. After that, the loan converts automatically to a 30-year repayment at the exact same rate, so the payment in years 11–40 matches the 30-year fixed payment. You get 40 years of fixed-rate security with 10 years of payment flexibility.
Worked example: a $2,000,000 home in Los Angeles County with 10% down is a $1,800,000 loan, $550,875 above the county's $1,249,125 limit. At 6.875%, the 30-year fixed payment is about $11,825 a month, while the interest-only payment is about $10,313, freeing up roughly $1,500 a month for the first 10 years.
Third, how much should you keep in the bank? Most jumbo programs require 6–12 months of payments (principal, interest, taxes and insurance) in reserves after closing. Retirement and brokerage accounts can count. See our jumbo loan program, or the state guides for Oregon and California.
Ready to apply?
Numbers look right? Explore our Jumbo Loans page for eligibility details, rates, and next steps.
About This Calculator
What the Jumbo Loan Calculator is For
A loan becomes jumbo once it exceeds your county's 2026 conforming limit: $832,750 in every Oregon county and up to $1,249,125 in California's highest-cost counties, with higher limits for 2–4 unit properties. Choose your state, county, and unit count, then enter a purchase price and down payment to see whether the loan is conforming, high-balance, or jumbo. The calculator compares a 30-year fixed payment with our 40-year fixed that is interest-only for the first 10 years and then converts automatically to a 30-year repayment at the exact same rate. It also estimates 6 and 12 months of reserves. Model standard jumbo at 10% down, or 0% down for eligible VA and physician borrowers.
Common Use Cases
- Checking whether a loan amount is jumbo in a specific Oregon or California county
- Comparing a 30-year fixed with a 40-year fixed with 10 years interest-only
- Estimating how much to keep in reserves after closing
Ready to turn numbers into a loan?
Or call 503-966-9255Common Questions
Jumbo Loan Calculator — Frequently Asked Questions
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From the Blog
Further Reading
ResidentialCan You Use Your VantageScore for a Mortgage? (What Changed in September 2026)
For decades a mortgage lived and died by a Classic FICO score. That is changing. As of the 2026 rollout, Lumen Mortgage can evaluate a borrower using VantageScore® 4.0 on conventional, VA, and FHA Streamline loans — a model that reads trending credit data over time and is built to score tens of millions of adults that older models can't. Here is exactly where each program stands, how the score is used, who actually benefits, and what to do if VantageScore still doesn't get you there.
InvestmentTurned Down for a Jumbo Loan Because of the Acreage — How We Rescued a Multimillion-Dollar Investment Property Refinance and Funded the Next Purchase
Another lender denied a real-estate investor's jumbo refinance because the property had too much acreage. We cleared the acreage up front — before ordering the appraisal — qualified the loan on the property's rent alone (no tax returns, no employment verification), paid off her existing loan, returned roughly half a million dollars in cash-out proceeds, and structured it as a 40-year fixed with the first 10 years interest-only so she could go buy her next property. Here's how, and why our jumbo lineup fits investors and high-net-worth borrowers other lenders can't.
RetirementHow to Qualify for a Mortgage in Retirement — Without Taking Taxable Distributions (Oregon & California, 2026)
You can qualify for a mortgage in retirement using your savings, investments, and retirement accounts — without starting a single taxable distribution. Here's how Oregon and California lenders actually convert assets, Social Security, and pensions into qualifying income, why the widely repeated numbers (the 70% "discount" and the 25% Social Security gross-up) are wrong, and why the timing of your application relative to your retirement date matters more than almost anything else.
All calculator results are estimates for informational purposes only and do not constitute a loan commitment or guarantee of any specific rate or terms. Actual loan terms will depend on creditworthiness, property type, and market conditions. Lumen Mortgage Corporation · NMLS #1498678 · Licensed in Oregon & California · 920 SW 6th Ave, Suite 1200, Portland, OR 97204.