A bridge loan funds the gap between buying your next home and selling your current one. It is short-term, secured on one or both properties, and priced well above a conventional mortgage — which is the point to keep in view, because the cost is driven by how long you carry it, not by the amount.
Duration, not size, drives what this costs
A bridge loan is priced as a short-dated, higher-risk facility. Interest accrues from day one, and origination is charged up front regardless of how briefly you hold it. So the variable that dominates the total is the number of months between the two closings — the one thing least under your control.
For reference on what "above conventional" means, the Freddie Mac Primary Mortgage Market Survey put the 30-year fixed average at 6.71% and the 15-year at 6.04% for the week ending September 3, 2026. A bridge facility prices above both. We have not published a typical bridge spread here because there is no equivalent published survey for bridge lending — the rate you enter should come from an actual quote, not from a benchmark.
That absence is worth stating plainly rather than papering over with an estimate. Bridge lending is a thin, negotiated market. Two lenders can quote the same borrower very differently, and there is no national average to check either against.
The risk this calculator cannot price
Every bridge loan carries an assumption: that the departing property sells within the term. The arithmetic on this page assumes it does. The risk is what happens if it does not.
- ·You are carrying two properties. Both mortgages, both tax bills, both insurance policies, both utility accounts, for as long as it takes.
- ·Extensions are not free. Where a lender grants one, it usually carries a fee and often a higher rate.
- ·A price cut costs more than the interest. Borrowers under bridge pressure discount to sell. That reduction is frequently larger than the entire cost of the loan, and it does not appear anywhere in this estimate.
- ·Qualification is doubled. You must carry both payments on paper, which is a harder test than the purchase alone.
The honest way to use this page is to run it at a realistic sale timeline and then again at double that, and ask whether the second number is survivable. If it is not, the alternatives — a sale contingency, a delayed closing, or renting between homes — deserve a closer look than the convenience of bridging.
One tax note: IRS Publication 936 limits the home mortgage interest deduction to the first $750,000 of acquisition debt ($375,000 married filing separately). A bridge loan taken alongside an existing mortgage can push combined debt past that, and interest above the limit is not deductible.
Methodology
Costs are computed from the loan amount, rate, term and fees you enter, over the months you specify. This calculator does not assume a bridge rate — there is no published national survey for bridge lending, so the rate must come from your own quote. The conventional mortgage averages quoted for comparison are the Freddie Mac PMMS figures for the week ending September 3, 2026. Deduction limits are from IRS Publication 936.
Sources
- Freddie Mac — Primary Mortgage Market Survey (week ending September 3, 2026) — accessed 2026-09-05
- IRS — Publication 936, Home Mortgage Interest Deduction — accessed 2026-09-05