How Interest-Only Mortgages Work
An interest-only mortgage lets you pay only the interest for an initial period — usually 5 or 10 years — before the loan recasts into fully amortizing payments over the remaining term. During the IO period the balance does not decline unless you make voluntary principal payments.
On a $900,000 loan at 7%, the interest-only payment is about $5,250 versus roughly $5,990 fully amortized. The gap widens on larger balances, which is why these are most common in high-cost California markets and on jumbo loans.
Who Interest-Only Suits — and Who It Does Not
The structure fits borrowers with lumpy income: commission earners, business owners taking irregular distributions, and professionals whose compensation is weighted toward year-end bonuses. It also suits investors who want to maximize cash flow during a hold period.
It fits poorly if you are relying on appreciation to build equity or plan to stay past the recast without a plan for the higher payment. That recast is the real risk — when a 10-year IO period ends on a 30-year loan, the remaining balance amortizes over 20 years, and the payment jump is substantial.
Most California interest-only programs are non-QM, meaning they sit outside the Qualified Mortgage safe harbor. Expect a larger down payment, reserves, and qualification at the fully amortizing payment rather than the interest-only one.
Frequently Asked Questions — Interest-Only Loans
What is an interest-only mortgage in California?
An interest-only mortgage requires only interest for an initial period, usually 5 or 10 years, before recasting into fully amortizing payments over the remaining term. On a $900,000 loan at 7%, the interest-only payment is about $5,250 versus roughly $5,990 amortized. Lenders qualify you at the higher fully amortizing payment, not the interest-only one. Expect 20-30% down and a 680-700 credit score.
What credit score do I need for interest-only loans?
Most interest-only mortgage programs in California look for 680-700+. Credit tends to affect your pricing more than your eligibility — a stronger score usually shows up as a lower rate rather than a different answer on whether you qualify.
How much down payment do I need?
An interest-only mortgage in California typically requires 20-30% down. The exact figure moves with your credit profile, occupancy and property type — stronger files land at the low end of that range.
How long does closing take?
An interest-only mortgage in California generally closes in 30-45 days. Appraisal turn times and how quickly you return requested documents are the two things that move that timeline most.
Can I use this program for an investment property?
An interest-only mortgage is available for primary, second home or investment. Occupancy affects both pricing and down payment, so confirm the intended use up front — it changes the terms you are quoted.
Are rates higher for interest-only loans?
Interest-only mortgage rates run roughly 1% to 2% above a comparable conventional loan, which is the cost of documenting income a different way. Your specific number depends on credit, down payment, occupancy and the day you lock.
Do I need to verify my income?
For an interest-only mortgage, income is qualified at the fully amortizing payment, not the interest-only payment. This is the main way the program differs from a standard conventional loan, and it is usually the reason borrowers choose it.
Can I refinance later into a different program?
Yes. With an interest-only mortgage the usual path is to refinance before the interest-only period recasts to avoid the payment jump. Nothing locks you in — plan the exit when you take the loan rather than after.
What documents do I need to apply?
For an interest-only mortgage you will need a government ID, credit authorization and property details, plus income documents plus reserves, which these programs weight heavily.
How do I get started?
Call (888) 703-1840 for a free interest-only mortgage consultation, or use the form on this page. Pre-approval usually takes 1-3 business days, and there is no cost and no hard credit pull to find out what you qualify for.
Last updated: July 2026. Sources: FHFA, HUD, VA, CalHFA, CFPB, California DRE, California Association of Realtors. All loans subject to credit approval. Rates subject to change.
About This Website
Mortgage Education Written by Licensed Mortgage Professionals
Mortgage Guide California was created by licensed mortgage professionals to help California homebuyers and homeowners understand their options before they apply. This website itself is not a lender or a mortgage broker — it does not take applications, quote binding rates, or make credit decisions. The guides are written and reviewed by people who place loans for a living, and the site is sponsored and paid for by Save Financial, Inc., a California-licensed mortgage broker.
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Mortgage Guide California is an educational resource sponsored and paid for by Save Financial, Inc. All mortgage services, rate quotes, and loan applications are handled by Save Financial, Inc. (NMLS #377740, DRE #01875766), a California-licensed mortgage broker. Equal Housing Lender. All loans subject to credit approval.