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Affordable housing underwriting is how you check whether an income-restricted property earns enough to cover its debt and deliver a return, when the rent it can charge is set by regulation instead of by the market. The One Big Beautiful Bill Act permanently raised 9 percent housing credit allocations by 12 percent and lowered the tax-exempt bond financing threshold for 4 percent credits from 50 percent of land and building costs to 25 percent, both taking effect in 2026. Affordable differs from conventional multifamily in one respect above all. The upside does not come from raising rents, because the rents are capped. It comes from the capital stack, the subsidy contracts and the tax credits, and each of those carries rules that outlast the loan.
In conventional multifamily, rent growth is the business plan. Here the rent ceiling is fixed by regulation, so the model has to earn its return somewhere else.
A conventional deal has a loan and equity. These deals can have eight sources, each with its own rules, and the underwriting has to satisfy all of them at once.
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LIHTC stands for the Low-Income Housing Tax Credit, created by the Tax Reform Act of 1986 and set out in Section 42 of the Internal Revenue Code. It gives investors a federal tax credit in return for funding the construction or rehabilitation of rent-restricted housing. In practice the credit is sold to investors, and the proceeds become equity in the deal, which is why it is the largest single source of affordable housing finance in the United States.
Both are LIHTC, and the names refer roughly to the annual rate at which credits are claimed. Nine percent credits are competitively awarded by state agencies from a limited annual allocation and generate far more equity, which suits new construction. Four percent credits come automatically with tax-exempt bond financing and generate less equity, which suits acquisition and rehabilitation. Which credit a deal uses changes the size of the equity, the rest of the capital stack and the competitive process to get there.
To qualify for 4 percent credits, a share of a property's land and building costs has to be financed with tax-exempt private activity bonds. That threshold was 50 percent for decades. The One Big Beautiful Bill Act permanently lowered it to 25 percent for properties placed in service after 31 December 2025, provided at least 5 percent of aggregate land and building costs are financed with bonds issued after that date. Because many states run out of bond volume cap, halving the requirement lets the same cap support substantially more deals. One point matters more than the headline: the 25 percent figure is a federal floor rather than a uniform standard. States can require a higher share, so the applicable threshold comes from the state's own program rules and not from the statute alone.
A HAP contract, short for Housing Assistance Payments contract, is an agreement under which the federal government pays part of the rent for eligible tenants directly to the owner. Where one is in place, a large share of the property's income comes from that contract rather than from the tenants, so its remaining term, its rent levels and its renewal history are core underwriting facts.
Project-based Section 8 attaches rental assistance to specific units in a specific building, in contrast to a voucher that a tenant carries with them. The assistance stays with the property when a tenant leaves, which makes the income more stable, and it also means the property's income depends on a contract with a fixed term that has to be renewed.
Area median income, usually shortened to AMI, is the midpoint household income for a metropolitan area or county, published annually by the Department of Housing and Urban Development. Rent and income limits for restricted units are set as percentages of it, such as 50 or 60 percent of AMI. In underwriting it matters that AMI is recalculated every year, so the rent ceiling on a property can move without anything at the property changing.
Where tenants pay their own utilities, the rent an owner can charge is the applicable rent limit minus a utility allowance, which estimates what those utilities cost. The allowance therefore comes straight off collected rent. It is set by schedules that get updated periodically, so an increase in the allowance reduces the owner's rent even though the rent limit itself has not moved. Underwriting a restricted property without checking the current allowance overstates the income.
Mixed income housing combines restricted and unrestricted units in one property, so part of the rent roll is capped and part moves with the market. It is not the same thing as mixed-use, which combines different property types. In underwriting it means running two rent models in one asset, and confirming which units carry which restriction, because the applicable fraction that drives the credit calculation depends on getting that split exactly right.
A qualified allocation plan, or QAP, is the document each state housing finance agency publishes setting out how it will award its competitive 9 percent credits, including scoring criteria and priorities. It is effectively the rulebook for whether a proposed deal can win an allocation in that state, and it changes from year to year, which is why a deal structured for last year's QAP may not score the same way this year.
Eligible basis is the portion of a property's development cost that can be counted toward generating credits, which generally excludes land and certain other costs. Qualified basis is eligible basis multiplied by the share of the property that is income-restricted. Qualified basis is what the credit amount is calculated from, so errors here flow straight through to the size of the equity a deal can raise.
A basis boost allows a property in a designated area to count up to 130 percent of its eligible basis when calculating credits, which increases the equity the deal can raise. The designations are qualified census tracts and difficult development areas, published by the Department of Housing and Urban Development. Many state agencies can also award a boost at their discretion under their allocation plans.
The compliance period is the initial span during which a property has to maintain its income and rent restrictions or risk losing credits already claimed. The extended use agreement is a separate recorded restriction that keeps the property affordable for substantially longer, commonly thirty years in total. The practical point for underwriting is that the restriction usually outlives the loan, so a buyer at year twenty is buying into rules they cannot exit.
Resyndication is refinancing an existing affordable property by allocating it a new round of tax credits, typically around the end of the initial compliance period. It funds a fresh renovation and brings in a new investor, and it resets the compliance clock. It has become one of the main ways older affordable housing gets preserved rather than sold into the market.
RAD stands for Rental Assistance Demonstration, a Department of Housing and Urban Development program that converts older public housing subsidy into long-term project-based assistance. The conversion lets a property raise private debt and equity, which public housing could not. For underwriting it means the subsidy contract in the file may be much newer than the building, and its terms have to be read on their own rather than assumed from the property's history.
Workforce housing generally refers to housing aimed at households earning too much to qualify for deep subsidy programs but not enough to afford local market rents, often described as the 60 to 120 percent of AMI band. Unlike LIHTC, it has no single statutory definition, so what counts as workforce housing depends on the program, the lender or the local ordinance involved. Some workforce housing carries formal restrictions and some is simply priced that way by the market.
Naturally occurring affordable housing, often shortened to NOAH, is housing that rents at affordable levels without any subsidy or legal restriction, usually because it is older and in a weaker submarket. It carries no regulatory ceiling, which means it also carries no protection: a buyer can renovate and raise rents, which is why preservation buyers and market-rate buyers compete for the same buildings.
| Metric | What it measures | Why it matters |
|---|---|---|
| Net operating income | Income left after operating costs, before debt service | The starting point for value and for how much hard debt the property supports |
| Restricted rent against limit | Current rent compared with the published ceiling for that income level | Shows whether there is headroom or the property is already at the cap |
| Restricted rent against market rent | Capped rent compared with what the unit could achieve unrestricted | The cushion protecting the income, and it disappears when market rents fall |
| Subsidy share of income | Portion of total income coming from a subsidy contract | Sizes the exposure to a single contract renewal |
| Qualified basis | Eligible basis multiplied by the restricted share of the property | The figure the credit amount is calculated from |
| Applicable fraction | Share of units or floor area that is income-restricted | Drives qualified basis and therefore the equity raised |
| Hard debt against soft debt | Split between debt that must be paid and debt that need not be | Two deals with the same total leverage can carry very different real obligations |
| Deferred developer fee | Fee left unpaid at closing, repaid from future cash flow | If projected cash flow cannot repay it, the stack does not close |
| Compliance period remaining | Years left before restrictions or credits are at risk | Sets both the recapture exposure and the timing of the year 15 decision |
| Operating and replacement reserves | Funded reserves required by lenders and investors | Required by most funding sources and frequently understated by sellers |
| DSCR | Income against annual debt service | Sets how large a loan the property can support |
| Debt yield | Income against loan amount | How a lender sizes a loan without relying on interest rates |
Two rows on this table link to the shared glossary rather than being defined here: DSCR and debt yield. Cap rate is deliberately absent, because value in these deals is driven by the capital stack and the restrictions rather than by capitalizing income at a market rate.
In underwriting, LIHTC is treated as a source of equity rather than as a subsidy on the income. The state awards credits, an investor pays for the right to claim them, and that payment funds part of the development cost. What the model then has to carry is the consequence: rents capped for decades, compliance obligations that can trigger recapture, and a partnership structure with an investor who will exit at a known point. The credit fills the funding gap, and the restrictions are what it costs.
In underwriting, the difference is how much equity the deal raises and how certain it is to happen. Nine percent credits are competitively awarded from a limited state allocation and produce substantially more equity per dollar of cost, which makes them suited to new construction but uncertain to win. Four percent credits come with tax-exempt bond financing and are effectively available to any qualifying deal, producing less equity, which is why they are typical for acquisition and rehabilitation where the gap to fill is smaller.
In underwriting, a HAP contract is closer to collateral than to income. Where one is in place, the federal government is paying a large share of the rent directly to the owner, so the property's cash flow depends on that contract's remaining term and on it being renewed. Two questions follow. Whether contract rents sit above or below market, which shapes the renewal outcome, and what the income looks like if renewal does not happen, which belongs in the model even when renewal has never been refused at that property.
The test sets how much of a property's land and building costs must be financed with tax-exempt private activity bonds in order to access 4 percent credits. It stood at 50 percent for decades. The One Big Beautiful Bill Act permanently lowered it to 25 percent for properties placed in service after 31 December 2025, so long as at least 5 percent of aggregate land and building costs are financed with bonds issued after that date. In underwriting terms, this matters most in states that routinely exhaust their bond volume cap, since the same cap can now support substantially more transactions. Note that 25 percent is a federal floor and not a uniform standard. States may set a higher requirement, so a deal only gets the benefit if the state has adopted the lower threshold, and the operative number comes from the state's program rules.
In underwriting, AMI is the input that sets the revenue ceiling. Rent limits for restricted units are published as percentages of the area median income, so the maximum rent on a 60 percent AMI unit is determined by that year's published figure rather than by the local market. Because the figures are recalculated annually, the rent ceiling on an existing property can move up or down without anything changing at the property, which is why a multi-year projection has to treat the limit as a variable.
Around the end of the initial compliance period, the original tax credit investor's interest in the deal has largely run its course and an exit is negotiated. In underwriting terms this is a decision point rather than an ending, because the extended use agreement usually keeps the property restricted well beyond it. The common outcomes are a resyndication with a new round of credits funding renovation, a sale to a preservation buyer, or a transfer to the general partner. What the partnership documents say about that exit is worth reading before the deal closes, not at year 14.
Workforce housing generally serves households earning too much for deep subsidy but not enough for market rents, often described as 60 to 120 percent of AMI. In underwriting the key point is that it has no single statutory definition, so the restrictions vary by program and jurisdiction, and some workforce housing carries no formal restriction at all. Each deal therefore starts by establishing what actually binds the rents, which can be a recorded agreement, a lender covenant, a local ordinance, or nothing but the market.
Underwriting in affordable housing is the process of establishing what an income-restricted property can charge under its regulatory limits, how much of its income depends on subsidy contracts and for how long, what each layer of its capital stack requires, and whether the resulting cash flow supports the hard debt and funds the reserves. It differs from conventional multifamily because the rents are capped by regulation rather than set by the market, so the return comes from the capital stack and the subsidy rather than from rent growth, and the compliance obligations typically outlast the loan.
To underwrite an affordable or workforce housing deal, start with the regulatory agreement and establish which units are restricted, at what income levels, and for how long. Check current rents against the published limits for the area and against what those units could achieve unrestricted, because that gap is the only cushion the income has. Read every subsidy contract for its term and renewal history, and size how much of the property's cash flow depends on it. Map the full capital stack, separating debt that has to be paid from debt that does not, and confirm what each source requires. The deal works if the income covers hard debt service at your target DSCR, funds the required reserves, and satisfies every funding source's rules at the same time, for as long as the restrictions run.
