Gap Financing

What Is Gap Financing?

Gap financing is the money that closes the difference between a housing development’s total cost and what its main funding sources provide. In affordable housing, the main sources are usually a first mortgage from a bank or public agency and, for many rental projects, tax credit equity. Whatever is still missing is “the gap.”

Gaps exist because affordability limits income. A lender sizes a first mortgage by what the property’s rents can repay, with a safety cushion measured by the debt service coverage ratio. When rents are restricted to what lower-income households can pay, the property supports a smaller loan. Construction costs, however, are no lower than for a market-rate building.

How It Works

A developer lists every source in a capital stack, ranked by who gets repaid first. The gap is what remains after the senior loan and the equity. Typical gap sources include:

• Federal block grants passed through states and cities, such as the HOME program and the Community Development Block Grant
• State and local housing trust funds
• The Federal Home Loan Bank Affordable Housing Program
• Foundation grants, and the developer deferring part of its own fee

According to the Office of the Comptroller of the Currency (OCC), state and local gap financing usually enters a project as soft loans, which are repaid only when the property has enough cash flow (see soft debt). HOME rules, for example, let local governments invest as deferred payment loans, interest-free loans, interest subsidies, grants, or equity. Delaware’s Housing Development Fund lends to tax credit developments specifically to help them become financially feasible. The OCC also notes that the 4% credit is much shallower than the 9% credit, so 4% deals often need several extra sources.

Example

Suppose a 60-unit development costs $24 million. Its restricted rents support a $6 million first mortgage, and tax credit equity provides $14 million. That leaves a $4 million gap. The developer might fill it with a $2 million state trust fund loan, a $1.5 million city HOME loan, and a $500,000 deferred developer fee. Each source comes with its own application, timeline, and compliance rules.

Why It Matters for Workforce Housing

Homes for households above tax credit limits, roughly 80% to 120% of AMI, face their own version of the problem. In high-cost areas, rents that moderate-income workers can afford may still fall short of what new construction requires. Without tax credit equity, these projects lean on other sources: local trust funds, donated or discounted public land, fee waivers, employer contributions, and patient capital that accepts lower returns.