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Estimate monthly payment, total cost, reserve adequacy and see whether an 80/10/10 piggyback beats a single jumbo loan.
We compute your effective rate (base rate + occupancy premium), amortize the full loan for the term, and add property tax, insurance, and HOA to get PITI. Reserves are compared against the lender's required months of PITI to flag qualification gaps.
For the piggyback comparison, we cap a 1st mortgage at the 2026 conforming limit ($832,750.00) at the conforming rate, then finance the remainder at the HELOC/2nd rate over the same term, and sum both cash flows for an apples-to-apples total cost.
Any single-family mortgage above the FHFA conforming loan limit — $832,750.00 in most areas, up to $1,249,125.00 in designated high-cost areas.
Jumbos aren't purchased by Fannie Mae/Freddie Mac, so lenders hold the risk on their own books. That extra risk shows up as a rate premium (typically 0.10–0.50% over conforming, though in some markets jumbos actually price below conforming for top-tier borrowers).
Most jumbo lenders require 700+, with best pricing at 740+. Some portfolio lenders will go down to 680 with larger down payments and stronger reserves.
Underwriting is stricter: 10–20%+ down, 6–18 months of PITI in reserves, and DTI usually capped at 43–45%. Documentation of income and assets tends to be more thorough.
An 80/10/10 splits your financing into a first mortgage at the conforming limit plus a smaller 2nd loan or HELOC for the rest. It avoids jumbo pricing on the whole balance but you juggle two loans and the HELOC rate is typically variable and higher — this calculator compares both paths side-by-side.
Results are estimates for educational purposes only and are not financial advice. Verify with a qualified professional before making decisions.
Last updated October 2026