What Is a Jumbo Loan?
A jumbo mortgage is any loan that exceeds the conforming loan limits set by Fannie Mae and Freddie Mac. In Alameda and San Francisco counties, the 2026 conforming limit is $1,249,125 (the high-cost ceiling; the baseline limit elsewhere is $832,750). Any loan above this amount is "jumbo."
The distinction matters because conforming and jumbo loans are sold in completely different secondary markets, with different investors, different pricing, and different requirements. A $1.2M loan can be sold to Fannie Mae or Freddie Mac. A $1.3M loan cannot. It must be sold to jumbo loan investors or kept by the lender's portfolio.
Why Are There Conforming Limits?
Fannie Mae and Freddie Mac are government-sponsored enterprises (GSEs) that buy mortgages from lenders to create mortgage-backed securities sold to investors. They set limits on how large a loan they'll buy to manage their portfolio risk. The limit changes annually based on median home prices. In 2026, it's $832,750 baseline and $1,249,125 in high-cost areas like the Bay Area.
This system benefits most borrowers: conforming loans have lower rates because they carry the implicit guarantee of the U.S. government. But in expensive markets like San Francisco (median home $1.8M+) and Alameda (median $1.2M), many home purchases are jumbo.
Jumbo Loan Requirements: What Lenders Look For
Jumbo loans are riskier to lenders because they're larger and can't be sold to the GSEs. To compensate, jumbo lenders impose stricter requirements than conforming loans:
Down Payment
Conforming Loans: 3-5% down for first-time buyers, 10% for others.
Jumbo Loans: 10-20% down minimum. Most lenders strongly prefer 20%+ for best rates and easier approval.
On a $1.75M home in San Francisco, 20% down means $350,000 cash upfront. That's not unusual in the SF market, but it's a significant hurdle.
Liquid Reserves
This is the biggest difference between jumbo and conforming loans. Lenders want to see you can make payments even if you lose income. Liquid reserves are cash, savings, investments, anything you can access quickly (not retirement accounts or real estate equity).
- Conforming Loans: No reserves required (though more reserves help approve borderline loans).
- Jumbo Loans: 6-12 months of mortgage payment required in liquid reserves.
Hypothetical rates to show the math, not an offer or a quote. Figures are interest rate only, not APR; APR includes loan costs and would be higher. Ask for today’s rate and APR.
Let's calculate reserves for a $1.75M purchase with a jumbo loan:
- Purchase price: $1,750,000
- Down payment (20%): $350,000
- Loan amount: $1,400,000
- Interest rate: 6.75% (typical jumbo)
- Term: 30 years
- P&I payment: $9,080/month
- Taxes/Insurance estimate: $1,750/month
- Total monthly payment: ~$10,830
- 6-month reserves: $64,980
- 12-month reserves: $129,960
So on a $1.75M purchase, you need $350,000 down plus $64,980-$129,960 in liquid reserves. That's $414,980-$479,960 total cash required before closing costs. This is why jumbo buyers are typically high-net-worth individuals or dual-income professional households.
Credit Score
Conforming Loans: 620+ credit score (though 740+ is needed for best rates).
Jumbo Loans: 700-740+ minimum, with most lenders preferring 750+.
The difference: a $1M conforming loan with 680 credit might be approvable with higher rates. A $1.5M jumbo with 680 credit will be rejected by most lenders. The dollar amount of risk is simply too high.
Debt-to-Income (DTI)
Conforming Loans: 43-50% DTI acceptable depending on reserves and credit.
Jumbo Loans: 36-43% DTI, with most jumbo lenders preferring 36-40%.
Example: if you have $350,000 annual income and your new housing payment is $10,830/month ($129,960/year), that's 37.1% DTI. Acceptable, but tight for jumbo. Add existing debts (car loans, credit cards, student loans) and you might exceed 40% DTI, disqualifying you.
Employment and Income
Jumbo lenders scrutinize income more carefully than conforming lenders:
- W-2 Income: Straightforward. Recent pay stubs and prior 2 years tax returns required.
- Self-Employment: More documentation. 2-3 years of business tax returns, corporate returns, profit/loss statements, business bank statements. More scrutiny for inconsistent or declining income.
- Bonus/Commission Income: Most lenders require 2 years history to count. Must be documented in contracts or prior tax returns.
- Investment Income: 2 years history required. Dividend statements, brokerage statements.
Jumbo Loan Rates: Why They're Higher
Hypothetical rates to show the math, not an offer or a quote. Figures are interest rate only, not APR; APR includes loan costs and would be higher. Ask for today’s rate and APR.
Jumbo rates are typically 0.25-0.75% higher than conforming rates for the same borrower. Example pricing on the same day:
| Loan Type | Amount | Credit Score | Down Payment | Rate | Monthly P&I |
|---|---|---|---|---|---|
| Conforming Fixed | $900,000 | 740+ | 20% | 6.25% | $5,541 |
| Conforming Fixed | $1,100,000 | 740+ | 20% | 6.375% | $6,863 |
| Jumbo Fixed | $1,400,000 | 740+ | 20% | 6.75% | $9,080 |
| Jumbo Fixed | $2,000,000 | 740+ | 25% | 7.00% | $13,306 |
*Hypothetical interest rates, not APRs or an offer. Rates change daily; ask for today’s rate and APR.
Why the Premium?
- Size Risk: A $1.4M loan going bad costs lenders $1.4M; a $900K loan costs $900K.
- Market Liquidity: Jumbo loans are sold in a smaller secondary market with less liquidity. Lenders demand higher rates for this illiquidity.
- Borrower Concentration: Jumbo borrowers are wealthier and can exit if they choose (walk away, sell, move abroad). Less incentive to stay if underwater.
- Portfolio Constraints: Some jumbo lenders hold jumbo loans in portfolio instead of selling, tying up capital. They demand higher returns.
Jumbo Loan Strategies: How to Get Better Rates
Hypothetical rates to show the math, not an offer or a quote. Figures are interest rate only, not APR; APR includes loan costs and would be higher. Ask for today’s rate and APR.
Strategy 1: Use a Broker
Jumbo lending is where mortgage brokers excel. Most jumbo buyers don't shop. They go to their bank and accept whatever rate the bank quotes. But banks often have limited jumbo volume and less competitive pricing.
A broker shops 100+ jumbo lenders simultaneously. On a $1.5M jumbo, the difference between a 7.0% bank rate and a 6.5% broker-shopped rate is about $6,000 in the first year and roughly $179,000 in total interest over 30 years (payment formula M = P×r/(1−(1+r)−360), r = rate/12: $9,980/month at 7.0% vs $9,481/month at 6.5%, a $499/month gap; ×12 = $5,982 in year one, ×360 = $179,466 over the life of the loan). This is why most Bay Area jumbo buyers use brokers.
Strategy 2: Increase Your Down Payment
A 20% down payment qualifies you for jumbo lending. A 25% down payment gets you better rates. A 30% down payment qualifies you for the best jumbo rates and may offset some reserves requirements.
Hypothetical rates to show the math, not an offer or a quote. Figures are interest rate only, not APR; APR includes loan costs and would be higher. Ask for today’s rate and APR.
On a $1.75M purchase:
- 20% down: $350,000, loan $1,400,000, rate 6.75%, payment $9,080
- 25% down: $437,500, loan $1,312,500, rate 6.50%, payment $8,296 (save $784/month)
- 30% down: $525,000, loan $1,225,000, rate 6.25%, payment $7,543 (save $1,537/month). Bonus: $1,225,000 is under the $1,249,125 limit, so this one is conforming, not jumbo.
Strategy 3: Use a Piggyback Loan Structure
Instead of one jumbo loan, you can use an 80/10/10 or 80/15/5 structure:
- 80/10/10: 80% first mortgage, 10% second mortgage, 10% down payment (cash)
- 80/15/5: 80% first mortgage, 15% second mortgage, 5% down payment (cash)
- Bay Area version: first mortgage capped at the $1,249,125 conforming limit, second mortgage covers the rest of the financing
Hypothetical rates to show the math, not an offer or a quote. Figures are interest rate only, not APR; APR includes loan costs and would be higher. Ask for today’s rate and APR.
On a $1.75M purchase with 10% down and a conforming first at the limit:
- Down payment: $175,000 (10%)
- First mortgage (conforming): $1,249,125 at 6.25% = $7,691
- Second mortgage: $325,875 at 7.5% = $2,279
- Total P&I: $9,970/month
- vs. a single $1,575,000 jumbo at 6.75%: $10,215/month (about $245/month less with the piggyback, but you carry two loans)
Piggyback loans made sense when conforming rates were much lower than jumbo rates. Today, the advantage is modest. However, they can help borrowers with lower down payments or tighter reserves: you need reserves on the conforming loan only (6 months at ~$7,700 = $46,200), not the full combined payment.
Strategy 4: Build Exceptional Reserves
Most jumbo lenders require 6-12 months reserves. If you have 18-24 months of reserves, lenders will approve you faster and potentially offer better rates. You're lower risk to them.
When Is a Jumbo Loan Your Only Option?
In the Bay Area, many home purchases require jumbo financing simply because home prices exceed the conforming limit:
- San Francisco median home price: ~$1.8M (jumbo required)
- Alameda median home price: ~$1.2M (conforming with 20% down; jumbo with less)
- Oakland median home price: ~$900K (conforming sufficient)
- Berkeley median home price: ~$1.4M (right at the line; 20% down keeps it conforming)
For buyers in SF, or anyone above the median in the East Bay, jumbo financing is simply the reality. The solution is having strong credit (750+), 20%+ down payment, and liquid reserves.
Common Jumbo Loan Misconceptions
Myth: Jumbo Loans Are Impossible to Get
False. Jumbo lending is robust in the Bay Area. Lenders like Schwab, Jumbo Mortgage, Self Bank, and many traditional banks actively lend jumbo mortgages. The requirements are strict (credit, down payment, reserves), but achievable for qualified borrowers.
Myth: Jumbo Loans Take Longer to Close
False. Jumbo loans close on the same timeline as conforming loans, typically 21-30 days. There's no additional documentation burden (though lenders do review income and reserves more carefully).
Myth: You Need a Mortgage Broker for Jumbo Loans
False. You can get jumbo loans from banks and lenders directly. However, a broker's ability to shop 100+ jumbo lenders simultaneously often results in better rates, so most jumbo buyers prefer brokers for that advantage.
Jumbo loans are mortgages above $1,249,125 (the 2026 high-cost conforming limit in Alameda and San Francisco counties). They require 10-20% down payment, 6-12 months of liquid reserves, strong credit (700+), and lower DTI (36-40%). Rates are 0.25-0.75% higher than conforming loans, but brokers can shop jumbo lenders to find the best pricing. For Bay Area home buyers, jumbo financing is the norm at median prices. Strong reserves and credit are the keys to approval and best rates.
Frequently Asked Questions
What loan amount makes a mortgage jumbo in the Bay Area? +
In Alameda and San Francisco counties, any loan above $1,249,125 is considered jumbo. This is the 2026 Fannie Mae/Freddie Mac high-cost conforming limit; the baseline limit in most U.S. counties is $832,750. A $1.5M loan is definitely jumbo; a $1.1M loan is conforming.
How much of a down payment do I need for a jumbo loan? +
Jumbo loans typically require 10-20% down minimum, with many lenders preferring 20%+ for best rates. You cannot get a jumbo with FHA or VA programs. No PMI is available on jumbo loans; lenders offset higher risk with higher rates and down payment requirements instead.
Are jumbo loan rates higher than conforming loans? +
Yes, jumbo rates are typically 0.25-0.75% higher than conforming rates for the same borrower profile. On a $1.5M loan, a 0.5% rate difference costs $7,500 more per year in interest. However, the difference has narrowed significantly in recent years as jumbo lenders compete aggressively.
What are jumbo loan reserves and why do they matter? +
Jumbo loan reserves are liquid assets you must show (cash, investments, retirement accounts) in addition to your down payment and closing costs. Most jumbo lenders require 6-12 months of mortgage payment in reserves. On a $1.5M jumbo with a $9,700 monthly payment, that's $58,200-$116,400 in additional reserves needed.
Can I combine a conforming loan with a jumbo piggyback loan? +
Yes. A piggyback structure uses a conforming first mortgage at the limit ($1,249,125) with a second mortgage for the remainder. This can save money if conforming rates are lower. For example, on a $1.75M purchase with 10% down, you'd do a $1,249,125 conforming first and a $325,875 second, each at their respective rates.
Figures are illustrative examples as of September 2026, not a quote. Any interest rate shown is hypothetical, not an advertised rate, and is not an APR. Rates and limits change; ask for today's rate and APR.