Size is not a different formula
Principal and interest still use the standard amortization formula. What changes is pricing, reserve requirements, and how much down payment the lender wants.
If a lender calls the loan jumbo, use the rate and the mortgage-insurance or fee terms on that quote. Do not assume the conventional 20% PMI rule still applies the same way.
Limits are a lookup, not a paragraph
The Federal Housing Finance Agency publishes conforming limits. They are updated. A guide that hard-codes last year's number will become wrong.
Until this site is wired to that publication, it will describe the idea and ask you to check the current county limit yourself.
| Piece | Still true |
|---|---|
| Payment formula | Standard amortization |
| County limit | Look up the current FHFA figure |
| PMI assumption | Only if the quote uses it |
Calculators
Related guides
Sources
Common questions
Are jumbo rates always higher?
No. Pricing moves. Enter the rate you were offered instead of assuming a penalty.
Where is the official limit?
The Federal Housing Finance Agency publishes conforming loan limits. Use the current table for the county.