Jumbo Loans in Marin County 2026: What Every Buyer Needs to Know

If you’re buying a home in Marin County in 2026, there’s one thing you need to understand immediately: almost every purchase here requires a jumbo loan. With a median home price of $1,865,000 and a conforming loan limit of $1,249,125, the moment your loan exceeds that threshold you’re in jumbo territory — with different rules, different lenders, and different qualification standards than most buyers expect. See our guide to California mortgage rates in 2026. See California’s 2026 conforming loan limits for current thresholds.

What Is a Jumbo Loan?

A jumbo loan is any mortgage that exceeds the conforming loan limit set by the Federal Housing Finance Agency (FHFA). In Marin County, that limit for 2026 is $1,249,125 for a single-unit property. Any loan above that amount is a jumbo loan and cannot be sold to Fannie Mae or Freddie Mac — meaning private lenders set their own underwriting guidelines, which vary significantly from lender to lender.

Jumbo Loan Tiers in Marin County

Marin buyers typically fall into one of three jumbo tiers, each with different requirements:

Jumbo Loan Requirements in Marin County

Credit Score

Most Marin jumbo lenders require a minimum 700 credit score. For loan amounts above $2M, most lenders want 720–740+. Ultra-jumbo lenders (above $4M) typically require 760+. A difference of 20–30 points in your score can change both your eligibility and your interest rate by a meaningful margin.

Down Payment

Some Marin jumbo programs allow as little as 10% down on loan amounts up to $2M, though 20% is the most common threshold. Going below 20% on a jumbo loan typically means a higher rate and sometimes the addition of private mortgage insurance. For super and ultra jumbo, most lenders require 20%–30% down.

Reserves

This is where many Marin buyers are caught off guard. Jumbo lenders require significant cash reserves — liquid assets remaining after your down payment and closing costs. Standard jumbo programs typically require 6–12 months of mortgage payments in reserves. Super and ultra jumbo programs often require 12–24 months. On a $3M home with a $2.4M mortgage at $14,000/month, that’s $168,000–$336,000 in reserves beyond your down payment.

Debt-to-Income Ratio

Jumbo DTI limits are typically stricter than conforming loans — usually 43%–45% maximum, compared to 50% on some conforming programs. For ultra-jumbo, many lenders cap at 40% or lower. This means your total monthly debt obligations (including the new mortgage) should not exceed 43%–45% of your gross monthly income.

Income Verification

Full income documentation is standard for jumbo loans. Self-employed buyers face the same challenge here as elsewhere — two years of tax returns with net income sufficient to qualify. Bank statement loan programs (non-QM) are available for self-employed Marin buyers who show strong deposits but have significant write-offs.

Interest Rates on Marin Jumbo Loans

Jumbo rates have historically been slightly higher than conforming rates, though the gap has narrowed in recent years. The rate you receive depends on your loan amount, credit score, LTV (loan-to-value ratio), and lender. A Marin mortgage broker with multiple jumbo lender relationships can shop your loan across lenders to find the most competitive rate for your specific profile — something a single bank cannot do.

Jumbo Loans for Specific Marin Communities

• Tiburon / Belvedere / Ross: Ultra-jumbo territory — $4M–$10M+ purchases are common. Portfolio lenders and private bank programs are often the right fit.
• Mill Valley / Kentfield / Greenbrae: Super-jumbo range — $2M–$5M. Strong income documentation and reserves are essential.
• San Rafael / Novato / Fairfax / San Anselmo: Standard jumbo — $1.25M–$2.5M. More lender options, still requires careful qualification.
• Corte Madera / Larkspur / Marinwood: Mix of standard and super jumbo depending on neighborhood and property type.