Conforming vs Jumbo Loans
Conforming vs Jumbo Loans
Fannie Mae and Freddie Mac set a ceiling on the mortgages they'll buy. Above that limit, you need a jumbo loan—costlier, stricter requirements, and a smaller market of lenders.
Key takeaways
- The conforming loan limit for 2024 is $766,550 for single-family homes in most counties (higher in high-cost areas like San Francisco and New York).
- Conforming loans are cheaper: rates are 0.25–0.75% lower and PMI (under 20% down) is 0.25–0.5% cheaper annually.
- Jumbo loans require 20%+ down, higher credit scores (740+), lower DTI (typically 36% max), and larger cash reserves (6–12 months).
- Jumbo rates are higher because they're portfolio loans (held by the lender, not sold) and the market is smaller and riskier.
- Buying a $1M home with 20% down requires $200,000 cash; a 10% down payment isn't usually available for jumbos.
The conforming limit
The federal government, via the Federal Housing Finance Agency (FHFA), sets an annual conforming loan limit. This is the maximum loan amount Fannie Mae and Freddie Mac will purchase. For 2024, it's $766,550 for single-family homes in most of the country.
High-cost areas have higher limits:
- San Francisco Bay Area: $1,150,000–$1,300,000+ (depending on county)
- New York City metro: $1,000,000–$1,150,000
- Miami, Los Angeles: $1,000,000+
Alaska and Hawaii also have higher limits. If you're buying a $850,000 home in San Francisco, your loan is conforming. The same $850,000 home in Des Moines, Iowa triggers jumbo rates.
Why the limit matters
Fannie Mae and Freddie Mac exist because of government backing. They buy mortgages from banks and repackage them as mortgage-backed securities (MBS), insuring investors against default. Because of this implicit government guarantee, investors trust Fannie/Freddie MBS, which keeps rates low.
Jumbo loans don't have this backing. Banks originate them and often keep them in portfolio (don't immediately sell). This means the bank carries the credit risk. To compensate, jumbos charge higher rates and require stricter credit, equity, and liquidity standards.
Conforming loan: Rates and PMI costs
A conforming $600,000 loan at 6% rates might have PMI of 0.75% annually if down payment is 10%.
- Monthly P&I: $3,600
- Monthly PMI (0.75%): $375
- Total: $3,975/month
For a jumbo $900,000 loan (same 6% baseline), the rate is likely 6.5% (0.5% premium), and PMI is not available (down payment must be 20%+ for jumbos). If you put 20% down:
- Loan: $720,000
- Monthly P&I at 6.5%: $4,559
- Monthly PMI: $0 (not allowed)
- Total: $4,559/month
The jumbo is $584/month more expensive (14.7% higher), largely due to the rate premium and required 20% down payment (no PMI offset).
Jumbo requirements and restrictions
Down payment: Minimum 20%, often 25% on riskier properties (investment, vacation, non-traditional).
Credit score: 740+ is the new baseline; 760+ for better rates. Under 740, approval is difficult or rates jump 1%+.
Debt-to-income ratio: 36% back-end (vs. 43% for conforming). Some lenders are stricter at 33%.
Cash reserves: 6–12 months of all debts (mortgage, car, credit cards). For a $4,500/month mortgage, that means $27,000–$54,000 sitting in the bank, unused.
Property type: Primary residence preferred. Investment properties, second homes, and cash-out refinances are possible but at higher rates and stricter terms.
Occupancy: Owner-occupied only (no house-hacking with jumbo).
Liquidity verification: Lenders require recent bank statements, investment account statements, and proof of income (tax returns, W-2s, business financials). Stated income is not acceptable.
Appraisal: Appraisal is thorough and often carried out by jumbo-experienced appraisers. A property with deferred maintenance, non-traditional finishes, or in a declining neighborhood might not appraise high enough to justify the loan.
Jumbo rate examples (2024 context)
Assume prime (conforming) rate is 6.0%.
| Jumbo loan size | Rate | Premium vs. conforming | Reason |
|---|---|---|---|
| $800,000 | 6.25% | +0.25% | Slightly above limit, small premium |
| $1,000,000 | 6.50% | +0.50% | Larger loan, higher risk |
| $1,500,000 | 6.75% | +0.75% | Much larger loan, concentrated risk |
| $3,000,000 | 7.25% | +1.25% | Very large loan, portfolio risk |
The premium widens as loan size increases because the lender's maximum loss grows. On a $3M jumbo with 20% down, the lender is exposed to $2.4M of risk; on a $600k conforming with 10% down, it's $540k. Risk scales nonlinearly.
Worked example: Conforming vs. jumbo on a $1M purchase
Scenario 1: Conforming mortgage on a $900,000 home
- Down payment (20%): $180,000
- Loan: $720,000
- Rate: 6.0%
- Monthly P&I: $4,319
- PMI: $0 (20% down)
- Total: $4,319/month
- 30-year cost: $4,319 × 360 = $1,554,840
Scenario 2: Jumbo mortgage on a $1,200,000 home
- Down payment (20% required): $240,000
- Loan: $960,000
- Rate: 6.50% (jumbo premium)
- Monthly P&I: $6,102
- PMI: $0 (20% down, not allowed on jumbos anyway)
- Total: $6,102/month
- 30-year cost: $6,102 × 360 = $2,196,720
Monthly premium for the $1.2M jumbo: $6,102 − $4,319 = $1,783/month.
On top of that, you must have $36,600–$73,200 (6–12 months of $6,102/month) sitting idle in savings.
When jumbo is unavoidable: High-cost markets
In San Francisco or Manhattan, even middle-class homes exceed conforming limits. A $2M home with 20% down requires a $1.6M jumbo loan. There's no workaround; you either pay the jumbo premium or buy elsewhere.
In these markets, jumbo lenders compete actively, and rate premiums are tighter (maybe +0.25% instead of +0.5%). More lenders offer jumbo products, so shopping is important.
Strategies to avoid jumbo (if possible)
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Buy just under the conforming limit: A $1.5M home might have a $750,000 conforming portion and a $750,000 second mortgage (piggyback loan) at a higher rate. This is less common post-2008 but still available from some portfolio lenders.
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Put down more than 20%: The higher your equity, the lower the perceived risk. 25% or 30% down on a jumbo might get you a better rate.
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Wait and refi when rates drop: Buy with a jumbo at a high rate, then refinance to conforming when the loan drops below the limit (via principal paydown or property value adjustment).
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Invest before buying: If you can save more, increase down payment to reduce loan size and potentially keep it below the conforming limit.
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Relocate to a lower-cost area: This is drastic but real; jumbo rates can cost $100k+ over the life of the loan.
Jumbo market and lender choice
Not all lenders offer jumbo mortgages. Conforming loans are standardized and sold easily; jumbos are bespoke and risky. Major jumbo lenders include:
- Larger portfolio banks (JPMorgan, Wells Fargo, Bank of America)
- Jumbo-specialist lenders (Fidelity National, Guild Mortgage, Guaranteed Rate)
- Some credit unions and regional banks
Jumbo rates vary by lender more than conforming rates do. A 0.5% rate difference between lenders on a jumbo mortgage means $40,000+ in lifetime interest. Shopping 4–5 jumbo lenders is essential.
Decision tree
Next
You've decided on conforming versus jumbo. Now comes the fixed-versus-adjustable decision—arguably more consequential for monthly cost. A fixed-rate locks in certainty; an ARM bets on rate paths and refinance windows.