A gap mortgage is a short-term loan, usually running three to twelve months, that covers a defined funding shortfall in a real estate deal until a larger, already-identified source of money arrives. It does not finance the whole purchase. It plugs a hole inside a financing structure that is otherwise in place, carries a higher interest rate than a conventional mortgage, and is repaid in a single lump sum when the anticipated funds come through.
How a Gap Mortgage Works
Speed is the whole point. Terms rarely exceed twelve months, and many run just three to six. The loan exists to inject cash while a cheaper, slower funding source catches up.
Rates reflect that urgency. Gap loan rates typically land several points above prime, often in the 8% to 12% annual range depending on the risk profile of the deal. Repayment comes as a balloon: the full principal plus accrued interest and fees, due on the maturity date or when a specified triggering event (a scheduled construction draw, a property sale, a permanent loan closing) happens.1Consumer Financial Protection Bureau. What Is a Balloon Payment? When Is One Allowed?
The collateral is almost always the property itself, but the gap mortgage usually sits in a subordinate lien position behind the senior construction or acquisition loan. If the borrower defaults and the property is sold through foreclosure, the senior lender gets paid first. The gap lender collects only from what is left.
Because the lien is junior, the gap lender cares less about the raw property value than about how reliable the anticipated payoff source is. A gap loan backed by a confirmed takeout commitment from a permanent lender is a very different animal from one relying on a speculative future sale.
Where a senior lender and a gap lender both have claims on the same property, an intercreditor agreement sets the pecking order and limits what the gap lender can do if the borrower defaults on the senior debt. These agreements often include standstill provisions preventing the gap lender from pursuing enforcement while the senior mortgage is in place. Read that document carefully before signing. It can sharply restrict the junior lender’s independent remedies, and that affects pricing and risk on both sides.
When Borrowers Use a Gap Mortgage
Construction Draw Shortfalls
The most common commercial use is covering the window between scheduled construction draws. A contractor needs to pay a subcontractor now, but the next draw from the primary construction lender is weeks away. A gap mortgage covers the shortfall and keeps work moving. When the next draw releases, the gap loan is paid off.
Construction delays cascade. A single missed subcontractor payment can halt work, push back the schedule, and trigger penalty clauses that cost far more than the gap loan’s interest.
Carrying Costs Between Acquisition and Income
Investors use gap financing to cover carrying costs between buying a property and getting a tenant signed or a buyer at the closing table. The investor locks the property down, executes a renovation or repositioning plan, and uses the gap loan for expenses in the meantime. The expected sale proceeds or lease income is the payoff source.
Residential Timing Mismatches
On the residential side, a gap mortgage can cover the down payment or closing costs on a new home when the sale of the current home is delayed but under contract. The borrower needs to close on the new property to secure it; proceeds from the old property have not arrived yet. The gap loan fills that window, and sale proceeds from the original home go directly to the gap lender when they come in.
The same structure lets a buyer submit a non-contingent offer, which carries real weight in tight markets where sellers routinely pass on offers contingent on another sale closing first.
What a Gap Mortgage Costs and What Lenders Require
Underwriting is less about long-term income stability and more about one question: how certain is the payoff event? Lenders want a documented exit strategy with a specific source and a specific timeline. In practice that means a fully executed purchase and sale agreement for the property being sold, or a binding commitment letter from a permanent lender for takeout financing.
Beyond the exit, lenders look at the borrower’s overall financial profile. Most gap lenders want credit scores in the mid-to-upper 600s at minimum. Loan-to-value ratios are conservative. Combined debt against the property, counting both the senior loan and the gap loan, is commonly capped at roughly 70% to 80% of appraised value, and a recent appraisal from an approved appraiser is standard.
Costs stack up:
- Origination fees of roughly 1% to 3% of the loan amount, reflecting the specialized underwriting and fast turnaround.
- Interest rates in the 8% to 12% annual range, substantially higher than conventional mortgage rates, driven by the subordinate lien and short duration.
- Third-party costs including appraisal fees, title insurance, and legal fees for the intercreditor agreement and subordinate lien documents.
Run the math honestly before committing. On a $200,000 gap loan at 10% interest held for six months with a 2% origination fee, total financing costs come in around $14,000. That number has to be absorbed somewhere in the deal, and the benefit of keeping the transaction on schedule has to outweigh it.
Gap Mortgage vs. Bridge Loan
People use the two terms interchangeably, and some lenders market the same product under both names. The underlying structures are not identical.
A bridge loan typically finances the entire gap between two major events, such as buying a new home before selling the current one. The loan is often most of the purchase capital or a large share of equity in the existing property. A gap mortgage covers a smaller, more targeted shortfall inside a financing structure that already exists. A construction project might carry a $10 million senior loan with a $200,000 gap mortgage covering a specific materials order; the payoff source is the next draw, not the sale of the whole project.
Collateral position follows the same pattern. Bridge loans often sit in first-lien position on the property being sold. Gap mortgages sit behind the primary financing. Bridge loans tend to run six to twelve months; gap loans sometimes just three to six. In practice, bridge loans show up more often in residential deals, and gap mortgages more often in commercial development and construction finance.
What Happens If You Default
Missing a payment on a gap mortgage can trigger damage well beyond the gap loan itself. Many senior loan agreements include cross-default clauses: if the borrower defaults on any other debt secured by the same property, the senior loan is automatically in default too. A missed gap payment can snowball into a full default on the primary financing, giving the senior lender the right to accelerate the entire balance and move toward foreclosure.
Even without a cross-default clause, the gap lender keeps its own foreclosure rights. A junior lienholder can start foreclosure independently, though it rarely makes financial sense unless the property is worth enough to pay off the senior lender and still cover the gap loan. That threat usually gets used as leverage to negotiate repayment or restructuring rather than to actually force a sale.
If the senior lender forecloses first, the junior lien is typically wiped out. The gap lender may receive nothing from the sale proceeds after the senior debt is satisfied. The borrower, however, may still owe the remaining gap loan balance as unsecured debt, depending on the loan terms and state law.
Is the Interest Tax-Deductible?
It depends on what the loan paid for. If the gap mortgage is secured by your main home or second home and the money went toward buying, building, or substantially improving that residence, the interest qualifies as home acquisition debt and is deductible. Total mortgage debt eligible for the interest deduction is capped at $750,000 for homes acquired after December 15, 2017, or $375,000 if married filing separately.2IRS. Real Estate (Taxes, Mortgage Interest, Points, Other Property Expenses)
If the loan proceeds went to something other than acquisition or improvement of the secured residence, the interest is generally not deductible. For commercial or investment properties, different rules apply, and interest may be deductible as a business or investment expense. Gap loans are short, so absolute interest totals are modest, but the deductibility question still affects the real after-tax cost.
A Note on the New York “Gap Mortgage”
In New York refinances, “gap mortgage” means something different. There it refers to a specific legal structure used alongside a Consolidation, Extension, and Modification Agreement (CEMA) to cut mortgage recording tax. New York taxes each recorded mortgage as a percentage of the loan amount, and in New York City those rates reach 1.80% to 1.925%. A CEMA consolidates the existing mortgage with the new loan rather than discharging and replacing it, so recording tax applies only to the “gap” between the old balance and the new, larger loan. On a refinance from a $400,000 balance to a $500,000 loan, tax hits only the $100,000 difference. That is a different animal from the short-term financing product described above. If the term comes up in a New York closing, ask your attorney or title company which meaning is in play.