How to Underwrite a Multifamily Deal With Negative Leverage in 2026

Agency debt at 5.30% means every Class A deal you look at in 2026 starts with negative leverage. You pay the lender more than the property earns from day one. This five-step framework sizes the gap, sets rent growth assumptions that hold up under scrutiny, and tells you when to walk before you spend 40 hours on a pro forma.

Where Negative Leverage Actually Shows Up in 2026

Fannie Mae DUS debt prices at 5.30%. Freddie Mac Optigo comes in at 5.18% to 5.34%. That is your starting point for any agency-financed deal.

Now set it against current cap rates by asset class:

• Class A, primary markets: 4.0% to 5.0%. Every deal in this bucket carries negative leverage against agency debt.
• Class B, primary markets: 5.0% to 6.5%. Leverage turns positive above the 5.3% threshold, but the margin is thin in primary markets.
• Class B, secondary markets: 6.5% to 8.0%. Most deals here have positive leverage. The financing challenge is not the spread; it is DSCR and refi risk on a value-add business plan.
• Value-add, any market: Current observed rate sits near 6.77%. Positive leverage is available, but only if your NOI projections hold.

Negative leverage is not a universal problem in 2026. It is a Class A and primary market problem. Most operators working in this environment describe the financing calculus as harder than it has been in years. Deals still close because a negative leverage spread is a year-one problem, not a hold-period problem. Underwrite it correctly and the math works over five years.

Step 1: Calculate Your Leverage Spread

Start by quantifying the gap. Your leverage spread is your going-in cap rate minus your all-in debt cost.

Leverage Spread = Going-In Cap Rate - All-In Debt Cost

Example: You are buying a 150-unit Class B deal in Cincinnati at a 5.8% cap rate. Agency debt costs 5.30% all-in. Your leverage spread is +50 basis points. Positive leverage.

Run the same deal in Austin at a 4.9% cap rate. Your leverage spread is -40 bps. You pay the bank more than the property yields from day one.

A negative spread does not mean walk. It means every dollar of debt adds negative carry until NOI grows enough to close the gap. The question to answer: how many years until the cap rate on your purchase price exceeds your debt cost? If the answer is never with realistic rent growth, walk. If the answer is year two or three with a credible value-add plan, the deal works.

Step 2: Use the Right Rent Growth Assumptions

The biggest underwriting error in 2021 to 2023 vintage deals: operators modeled 7% to 10% annual rent growth because markets were delivering it. Operators who used those numbers on Sun Belt bridge loans are now talking to special servicers.

For 2026 underwriting, CBRE data shows institutional buyers model 3.0% to 3.5% annual rent growth over a five-year hold in stabilized markets. Calibrate by market:

• Midwest (Chicago, Cincinnati, Columbus, Twin Cities, Cleveland): 3.0% to 3.5%. Supply is thin, demand is steady, and these markets have posted positive rent growth for three consecutive years.
• Sun Belt recovering (Miami, Charlotte, Nashville): 0.5% to 1.5% in years one and two, then 2.5% to 3.5% in years three through five as supply clears. Miami prints 3.8% rent growth in 2026 as new deliveries dry up.
• Sun Belt distressed (Austin, Phoenix, Denver): Model -2% to 0% in year one. Austin and Phoenix have posted steep year-over-year rent declines. In Denver, 68% of rentals are offering concessions. In Phoenix, more than 50% of units are offering at least one month free. Do not model a recovery before the supply pipeline clears.

Blend your rent growth carefully. CBRE data shows 57% of leases in most multifamily portfolios are renewals. Renewal increases outperform new-lease asking rents. Your effective rent growth runs 50 to 100 bps above the asking-rent headline. Model them separately.

Step 3: Build Concessions Into Year One

In distressed Sun Belt markets, concession penetration rates are severe. Denver has 68% of rentals offering concessions. Phoenix has more than 50% offering at least one month free. In the worst markets, the effective revenue drag on a new-lease cohort runs 5% to 8% below asking rent. Do not gross up to 100% occupancy and move on. Build a concessions line item and model it burning off over 18 to 24 months.

Use this structure: concessions at 6% of gross potential rent in year one, stepping to 2% by year two and 0% by year three. If the deal cannot reach cash flow neutrality by year two even after concession burn-off, the debt load is too heavy.

Step 4: Set a Conservative Exit Cap

Most 2021 deals broke here. Sponsors modeled exit caps 25 to 50 bps below their going-in cap. They bet on continued compression. They got expansion instead.

In 2026, model an exit cap 25 to 50 bps above your going-in cap over a five-year hold. National cap rates have been flat for several quarters with no clear compression trend. Underwriting to a tightening exit cap requires you to predict a macro move you have no control over.

Apply this framework: if you are buying at a 5.5% cap, model your exit at 5.75% to 6.0%. If the deal requires exit cap compression to generate your target return, you are relying on luck. This is speculation, not underwriting.

Step 5: Run the Refi Stress Test

Even if you buy all-cash or with bridge debt, you will face a refinance event. The refi gap is roughly 140 basis points. New debt costs approximately 6.2%. Maturing debt on 2021 to 2022 vintage deals priced at 4.8%. Trepp identifies $115 billion in CRE loans maturing by year-end 2026 with DSCR below 1.20x.

Agency minimum DSCR at underwriting is 1.25x for Fannie and 1.20x for CMBS Class A IO. Run this calculation at your year-three projected NOI:

Max Supportable Loan = (Year 3 NOI / 1.25) / Debt Constant
Debt Constant = Annual P&I / Loan Amount

If the answer is 55% LTV and you are buying at 75% LTV, you have a refi gap baked in. Either the purchase price needs to come down, or your value-add NOI growth needs to close the gap by year three. Run this number before you get to LOI.

When Negative Leverage Makes Sense

Negative leverage is not a deal-killer on its own. It works when:

• You have a clear value-add path. Push rents $150 per unit on a 100-unit deal through unit interiors. Your NOI improvement of $180,000 per year flips a 4.9% going-in cap to a 5.5% effective cap on your basis. Leverage turns positive.
• The supply pipeline has cleared. In markets where deliveries are down 40% to 50% year-over-year, rent growth accelerates as occupancy tightens. Negative leverage at close turns positive by year two without capital improvements.
• You are buying basis, not cash flow. Institutional buyers in primary markets accept negative leverage on 10-year holds and underwrite to eventual cap rate compression. On a three-year flip, the case is much harder to make.

When to Walk

Walk when hitting your target return requires all three of these at the same time: your rent growth hits the optimistic end of your range, your exit cap compresses, and interest rates drop materially. Any deal requiring three favorable macro outcomes is not a deal.

Also walk when the negative leverage gap exceeds 100 bps and the value-add plan is speculative. Full gut renovations, rezoning, or conversion deals carry huge execution risk. The cost of carry while you execute kills your IRR even if the exit works.

How MultiVest Engine Handles This

Running this analysis in Excel takes hours, introduces formula errors, and requires you to rebuild the model for every deal. MultiVest Engine's Quick Analysis section turns your deal inputs into a scored output in minutes, and the Scenario Builder lets you stress-test every assumption behind the leverage spread, including rent growth, concessions, and exit cap, without rebuilding a model for each variation.

For deals carrying bridge debt, the platform's bridge-to-permanent financing view shows your DSCR for every year of the hold, so you see the exact year NOI growth flips the deal to positive leverage and whether the refi math holds before you commit to a debt structure. You make the decision. The engine makes sure you have the right numbers first.

Operators screening more than two or three deals a month in a negative-leverage environment need a faster process. The operators closing deals in 2026 move fastest on the right ones. They do not spend three days in a spreadsheet only to find the refi math does not work at year three.

The Bottom Line

Negative leverage in 2026 is a Class A and primary market problem, not a universal one. Class B secondary deals at 6.5% to 8.0% cap rates carry positive leverage against agency debt. The challenge in those deals is DSCR at refi, not the initial spread. For Class A deals or any deal where the going-in cap sits below 5.3%, the math works only when your value-add plan is disciplined, your rent growth is honest, your exit cap is conservative, and your refi math closes at year-three NOI. Miss one of those four and you are building a hope model, not an underwriting model.

The operators who win in this environment are not waiting for rates to drop. They underwrite through the leverage spread, size the gap accurately, and close only when all four conditions are met.

References

1. SelectCommercial.com: Freddie Mac Multifamily Loan Rates (Updated April 29, 2026)
2. SelectCommercial.com: Freddie Mac Large Balance Multifamily Loan Rates (Updated April 27, 2026)
3. ApartmentLoanStore.com: Cap Rates for Apartment/Multifamily Properties 2026
4. Rod Khleif: Cap Rates for Multifamily 2026: Benchmarks by City (March 12, 2026)
5. CBRE: U.S. Real Estate Market Outlook 2026 — Multifamily Chapter
6. KB Exchange Trust: Multifamily Faces a Long Road to Recovery (January 15, 2026)
7. Hot Not CRE Podcast, Episode 61: 68% of Denver Rentals Offering Concessions (March 15, 2026)
8. YouTube: Episode 61 — 68% of Denver Rentals Offering Concessions (March 15, 2026)
9. Trepp: Multifamily Refinance Risk Reveals Buying Opportunities Across U.S. CRE (July 8, 2025)