A 221(d)(4) is not sized by one formula. HUD runs three independent tests and your loan is the lowest of the three. Most developers model only loan-to-cost and get a surprise at firm commitment. Enter your project below and see all three at once.
This runs the same three tests a MAP lender runs at feasibility. It is a screening estimate, not an underwriting decision — nothing here commits any lender to anything.
Each test answers a different question, and each is moved by different inputs. Knowing which one binds tells you where to spend your effort.
A percentage of HUD's recognized replacement cost — 87% for market-rate and affordable deals, up to 90% where 90% or more of units carry project-based rental assistance. Land counts at the lower of appraised value or actual cost. Moved by the cost review.
Stabilized NOI divided by annual debt service — which includes the annual MIP — must clear 1.15x market-rate and 1.11x for affordable, 90%+ rental assistance and middle-income projects (ML 2025-03, 8 January 2025; middle-income tier added by ML 2026-1, 22 January 2026). Moved by the appraiser's rents and expenses, by the rate, and by the MIP. Because MIP sits inside debt service, the premium moves proceeds and not just cost.
Section 207(c)(3) sets dollar caps per unit by bedroom count, adjusted by your area's high-cost percentage. Moved by unit mix and by whether you pursue a high-cost waiver. In expensive markets a project can clear both other tests comfortably and still be capped here.
The 221(d)(4) is the senior piece, and it rarely covers everything. These are the layers that legitimately stack behind it — and the conditions HUD attaches to each.
A surplus cash note is the workhorse of HUD gap financing. It is a subordinate obligation repayable only out of surplus cash — the money left after debt service, required reserve deposits and operating costs, computed under the Regulatory Agreement and typically distributable twice a year after audited statements.
Because it cannot hurt the insured mortgage. The note has no scheduled amortization that competes with debt service, no acceleration rights that reach the property, and no ability to force a default. If there is no surplus cash, nothing is owed that year. From HUD's perspective the FHA lien is undisturbed.
HUD's most accommodating category. Secondary financing from a federal, state or local government body — or an instrumentality of one — gets latitude that private subordinate debt does not, because the public lender's objective is the housing rather than the yield.
Tax credit equity is not debt, so it does not sit in the lien stack at all — which is exactly why it is the cleanest way to close a gap on an FHA-insured deal.
The 4% credit paired with tax-exempt bonds, or a competitive 9% allocation, brings investor equity that reduces the debt the project needs. That relieves pressure on the coverage test. The affordable designation itself then lowers the required coverage to 1.11x and lifts loan-to-cost to 90%, which raises what the loan supports. Both effects run the same direction.
On a substantial rehabilitation of a certified historic structure, the federal historic credit — and a state historic credit where one exists — can be layered with LIHTC. The structuring is genuinely complex and the credit investor's requirements will shape the ownership structure, so bring tax counsel in early rather than at closing.
Investment tax credits on solar and storage can be monetized, including through direct pay for eligible entities or through transfer. Whether the system is owned by the project or by a third party under a lease or power purchase agreement changes both the credit economics and what HUD has to approve as an encumbrance.
Energy work used to carry a financing advantage of its own. It no longer does, and the change is recent enough that a good deal of published guidance is still wrong about it.
HUD reduced the mortgage insurance premium to a uniform 0.25% upfront and 0.25% annual across every FHA multifamily program, effective 1 October 2025 and applying to applications submitted or amended on or after that date where the loan has not reached initial endorsement. The three reduced-rate categories created in 2016 — Green and Energy Efficient Housing, Affordable Housing, and Broadly Affordable Housing — were eliminated as economically obsolete, since the uniform rate is at or below what they offered. A green certification therefore no longer buys a premium reduction or the extra proceeds that came with it. It may still be worth pursuing for operating cost, for investor or allocating-agency requirements, or for a QAP scoring category — but not for the MIP.
Project-based rental assistance does not appear in the capital stack as a line item, but it moves more dollars than most of the pieces that do.
Two ways to reduce the cash you wire at closing without adding anything to the lien stack.
Where the general contractor is a related party, the Builder Sponsor Profit Risk Allowance lets the contractor's profit and overhead be treated as an equity contribution rather than a cash cost. It is added to the replacement cost basis on which the loan is sized, so the loan goes up and the cash equity goes down. The contractor genuinely forgoes the cash, and cost certification at final endorsement tests exactly that. Where the contractor is unrelated, the smaller SPRA allowance applies instead.
Fee deferred and repaid from cash flow over time, usually documented as a surplus cash note. State agency rules cap how much may be deferred and how long it may take to repay; the tax credit investor will have its own view, generally requiring repayment inside the compliance period out of projected cash flow.
Structures that look ordinary in conventional real estate finance and do not survive contact with FHA insurance. Worth knowing before a term sheet is signed.
| Structure | Why it fails | What works instead |
|---|---|---|
| Mezzanine debt secured by the property | A second lien on the insured collateral, with remedies that can disturb the FHA first mortgage | Preferred equity at the ownership level, or a surplus cash note with no property lien |
| Hard subordinate debt with scheduled payments | Competes with debt service and can trigger a default independent of the property's performance | Cash-flow contingent or surplus cash structure with a maturity past the FHA loan |
| Unapproved change orders | Every change to the approved construction contract is reviewed; unapproved work is not fundable | Submit through the lender and hold contingency against approved changes |
| Distributions outside surplus cash | The Regulatory Agreement restricts distributions to surplus cash after reserves are funded | Model distributions on the Regulatory Agreement's definition, not on pro forma cash flow |
| Commercial space above the limits | Commercial area and commercial income are both capped | Right-size the commercial component, or look at Section 220 in a qualifying urban renewal area |
Send us the project and we will come back with a preliminary view — including which test we think binds and what we would look at to move it.
The tool above is a screening estimate built on the inputs you provide. A real sizing needs the appraiser's pro forma, HUD's cost review and the statutory limits for your specific market and unit mix.