Capital Stack 101: How an Affordable Housing Deal Actually Gets Financed

A market-rate apartment building can often be financed with two ingredients: a conventional mortgage sized to the property's rental income, and enough equity to cover the rest. Affordable housing almost never works that way.

When rents are restricted to a fraction of what the local market would otherwise support, the income available to repay debt is restricted right along with it. A single conventional loan sized to that restricted income usually can't cover anywhere close to total development cost. The result is that nearly every affordable housing deal is financed with a capital stack — several distinct funding sources, each covering a different slice of cost, layered together and closing simultaneously.

The layers, generally

While every deal is different, most affordable housing capital stacks are built from some combination of the following, roughly in order of typical size:

• LIHTC equity. For most 9%-credit deals, and many 4%-credit deals too, tax credit equity is the single largest piece of the stack — often covering a substantial majority of total development cost. This is what makes the tax credit program the backbone of affordable housing finance nationally.
• Permanent debt. A mortgage sized not to total cost, but to what the property's restricted rental income can actually support — typically a much smaller loan than a comparable market-rate property would carry.
• Public soft/gap financing. State and local subsidy — competitive grant or low-interest loan programs, local housing trust funds, federal HOME funds passed through a local jurisdiction, and similar sources — that fill the gap between what tax credit equity and debt can cover and total project cost.
• Deferred developer fee. The developer's own fee for putting the deal together, often partially deferred — meaning paid out of future cash flow over time rather than at closing — specifically to help close the last piece of the financing gap.

LIHTC equity, in plain terms

Developers don't typically use tax credits directly. Instead, the credits are syndicated — sold, usually through a syndicator that pools capital from multiple investors, to investors (often banks and financial institutions with both an appetite for the tax benefit and, in the case of bank investors, regulatory incentive to invest in community development). In exchange for providing upfront equity into the deal, those investors receive a dollar-for-dollar federal tax credit spread over a multi-year period.

Credit pricing — how many cents of equity an investor pays per dollar of credit — moves with investor demand and broader market conditions, and has historically ranged roughly in the $0.85–$1.00-plus range per credit dollar, though pricing can shift meaningfully depending on the investment climate at any given time. That pricing directly determines how much actual equity a project's credit award translates into, which is why credit pricing swings can materially affect a deal's feasibility even when the credit award itself hasn't changed.

Soft and gap financing

Even with tax credit equity and a permanent loan in place, most deals still have a gap — and that's where public soft financing comes in. California's Multifamily Housing Program (MHP) is one well-known state source; many cities and counties also run their own local housing trust funds, and federal HOME funds are frequently passed through to local jurisdictions and layered in as well. These sources are typically structured as low- or no-interest loans, often with flexible or deferred repayment terms, precisely because the project's restricted income can't support additional conventional debt service.

Why the stack has to close all at once

Here's what makes affordable housing finance genuinely difficult compared to market-rate development: every layer in the stack is typically conditioned on the others being in place. A tax credit investor won't fund without confirmed permanent debt and gap financing commitments. A soft-financing source often won't commit without confirmed tax credits. That circularity means a developer isn't securing financing sources one at a time — they're coordinating several simultaneously, each with its own timeline, application cycle, and underwriting requirements, all needing to land in the same window for the deal to close.

That coordination problem — not any single source being hard to get — is usually the real reason affordable housing deals take so much longer to finance than market-rate ones, and why development teams with strong relationships across every layer of the stack have a real structural advantage.

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Track application windows and deadlines across state and federal funding sources on our funding calendar. Looking for a partner with experience closing a specific layer of the stack? Search the directory.