One number decides whether your loan is jumbo
The border between conforming and jumbo is the conforming loan limit, which the Federal Housing Finance Agency recalculates every year from national home price data. For 2025 it stood at $806,500 in most counties and $1,209,750 in high-cost areas, and it has risen most years as prices climb. Below your county's figure, Fannie Mae or Freddie Mac can buy the loan. Above it, they cannot.
That single fact drives everything people notice about jumbo lending. A conforming loan flows into a deep secondary market with standardized rules, which keeps rates low and makes one lender's offer look much like another's. A jumbo loan has no such pipeline. The lender holds it on the balance sheet or places it with private investors, writes its own underwriting manual, and prices risk however its own models say to. Two banks can look at the identical borrower and quote terms that differ by half a percent.
Buyers near the line have a lever conforming buyers do not. If the purchase price puts your loan a little above the limit, a modestly larger down payment can pull it under, and with it comes conforming pricing and looser reserve rules. Run both versions before assuming the jumbo route is inevitable.
Why every requirement tightens above the line
A jumbo lender carries the full default risk with no agency guarantee behind it, so the underwriting screws tighten on each dimension at once.
Credit comes first. Scores below 700 are rarely accepted, and pricing moves in tiers, commonly 700 to 719, 720 to 739, and 740-plus, with each step worth 0.125 to 0.25% on the rate. A 740 borrower can price 0.25 to 0.5% below a 700 borrower, which on a $960,000 loan is roughly $160 to $330 a month. Down payments scale with loan size, from 10% at the smaller end to 25 or 30% above $2 million. Debt-to-income usually caps at 43%, stretched to about 45% only for borrowers with substantial assets.
Then come reserves, the requirement that surprises first-time jumbo borrowers most. Lenders want 6 to 12 months of complete housing payments, principal, interest, taxes, and insurance, sitting in liquid accounts after closing. On a payment near $8,000, that is $48,000 to $96,000 held back in addition to the down payment. The logic is straightforward from the lender's chair: a borrower who can absorb a year of payments through a job change or an income gap is unlikely to hand back the keys, and on a loan this size the lender eats the whole loss if they do.
Shopping around matters more here than anywhere else
Conforming pricing is commoditized. Jumbo pricing is not, and the spread between the best and worst quote on the same borrower routinely reaches 0.375 to 0.5%, which is $240 to $330 a month on a $960,000 loan. Over a decade that spread pays for a car.
The variation has a structural cause. Without an agency rulebook, each lender prices from its own risk model and its own appetite for the relationship. A private bank may quote aggressively because it wants your investment accounts. A regional bank flush with deposits may want assets on its books this quarter. A credit union may beat both on a loan structure the banks will not touch. None of this shows up in advertised rates, which is why collecting four or five real quotes on your actual scenario is worth the afternoon it takes. The CFPB's guide to shopping for a mortgage walks through how to compare offers line by line, and everything in it applies double when no two lenders are pricing from the same sheet.
Ask each lender about relationship pricing explicitly. Many publish rate discounts, often 0.125 to 0.25%, for moving a threshold amount of assets to the institution, and on a jumbo balance those small fractions compound into real money.