Real Estate Underwriting Playbook (2026)

Introduction

Underwriting in 2026 is less about spreadsheet complexity and more about assumption discipline. Debt costs are still restrictive, loan maturities remain heavy, and occupancy risk is uneven across markets. The refinancing backdrop remains material after the 2025 maturity cycle, when $957 billion in commercial and multifamily balances were scheduled to mature (MBA, 2025). If your team does not standardize downside assumptions, two analysts can underwrite the same deal and deliver opposite conclusions.

TL;DR: Build every deal around the same sequence: confirm market demand, lock current debt assumptions, run downside DSCR and debt-yield tests, then decide with written thresholds. U.S. rental vacancy was 7.2% in Q4 2025 (U.S. Census Bureau, 2026), and a large 2025 maturity wall carried into refinancing workflows (MBA, 2025).

What changed in the 2026 underwriting environment?

The risk backdrop is still defined by financing friction. The Federal Reserve's January 28, 2026 implementation note kept the federal funds target at 3.50%-3.75% (Federal Reserve, 2026), while the 10-year Treasury was 4.13% on March 5, 2026 (FRED DGS10, 2026). That spread environment means cap-rate assumptions and debt sizing have to be treated as moving inputs, not fixed constants.

At the same time, inflation cooled but did not disappear. U.S. CPI was up 2.4% year over year in January 2026 (BLS CPI, 2026). That makes expense-growth assumptions highly market-specific: insurance, payroll, and repairs can still run above headline CPI in many secondary metros.

What should every deal model include before IC review?

At minimum, every model should include base, downside, and severe cases with explicit pass/fail outputs. The 2025 maturity cycle put this in focus: $957 billion of commercial and multifamily balances were slated to mature in 2025 (MBA, 2025), so refinance feasibility can no longer be treated as a footnote.

Your underwriting file should answer six questions in order:

1. Is current in-place NOI durable for 24 months?
2. What debt terms are actually available today?
3. What happens to DSCR and debt yield if NOI misses plan?
4. Can the business plan still refinance at maturity?
5. Is exit liquidity realistic for this asset and market?
6. Does the deal fit portfolio concentration limits?

Use Cap Rate, Debt Yield, and Exit Cap Stress Test as a companion worksheet when you lock those assumptions.

How should you set assumptions for rent, vacancy, and expenses?

Demand-side assumptions should start with observed vacancy and absorption, not pro forma rent growth targets. U.S. rental vacancy was 7.2% in Q4 2025 and statistically similar to recent quarters (U.S. Census Bureau, 2026), which supports a "stabilizing but not tight" baseline in many markets.

A practical setup:

• Base case: current market rent trend, realistic turn-time, and normalized concessions.
• Downside case: lower effective rent, slower lease-up, and higher bad debt.
• Severe case: combine revenue pressure with elevated opex and slower refinancing.

For deal teams that are entering new metros, pair this with Population, Jobs, and Supply: Data Framework for Market Entry so demand assumptions are tied to the same inputs each quarter.

Which credit metrics should control the decision?

IRR is a summary metric, not a risk control. In a refinancing-constrained market, underwriting decisions should be governed by survivability metrics first. MBA's maturity data shows how broad refinancing pressure has been across lender types and property sectors (MBA, 2025), so debt coverage resilience needs to be the core gate.

Use this order in investment committee memos:

1. Downside DSCR and covenant headroom.
2. Debt yield under stressed NOI.
3. Break-even occupancy after capex and reserve funding.
4. Refinance proceeds sensitivity at maturity.
5. Exit valuation range under cap-rate expansion.

If this feels too rigid, that is usually a signal the deal relies on upside, not risk-adjusted cash flow.

How do you run a refinance-risk test that is actually useful?

A refinance test should answer one question: can you repay maturing debt without assuming perfect timing? With long-term rates staying elevated versus the pre-2022 period, a "flat rate" assumption is not enough. The 10-year Treasury remaining near 4%+ in early March 2026 (FRED DGS10, 2026) justifies testing multiple debt coupons and proceeds constraints.

Use a three-step refinance module:

1. Re-size debt at conservative DSCR and debt-yield floors.
2. Run exit-cap scenarios at +25 bps, +50 bps, and +100 bps.
3. Compare estimated proceeds to total takeout needs including reserves and fees.

Then document one of three outcomes in writing: refinance likely, refinance possible with mitigation, or refinance unlikely.

What operating signals should trigger a re-underwrite post-close?

Underwriting should continue after closing. CPI decelerated to 2.4% year over year in January 2026 (BLS CPI, 2026), but property-level costs can still drift above inflation due to insurance and labor variability, especially in thinner vendor markets.

Set automatic re-underwrite triggers:

• NOI variance exceeds plan for two straight months.
• Leasing pace misses target by more than one turn cycle.
• Insurance/tax reset exceeds annual assumption band.
• Refinance proceeds estimate drops below policy threshold.

Use Expense Drift Benchmarks by Market Maturity Tier for ongoing budget controls and Debt Availability Tracker by Secondary Market Type for refinancing readiness checks.

What should be in every investment committee memo?

A strong memo should force consistent decisions across both good and bad market windows. Given the rate backdrop in early 2026, with policy still restrictive (Federal Reserve, 2026) and the 10-year Treasury still above 4% in early March (FRED DGS10, 2026), every IC packet should make downside funding and exit risk explicit rather than implied.

Add these required memo blocks:

1. Investment thesis and margin-of-safety statement.
2. Base/downside/severe scenario table with key assumptions.
3. Debt terms, refinance test, and covenant headroom summary.
4. Operating plan with measurable first-12-month milestones.
5. Explicit pass/fail decision with documented exception logic.

This structure keeps recommendation quality high and reduces post-close surprise when market liquidity changes quickly.

Frequently Asked Questions

How often should we refresh underwriting assumptions in 2026?

At minimum, refresh debt terms and market leasing assumptions before each investment committee decision and at least monthly for active pipeline deals. Rates and liquidity conditions can shift quickly enough that a 30-day-old assumption set may already be stale in credit-sensitive sectors, especially when benchmark yields move around refinancing windows (FRED DGS10, 2026).

Should we underwrite to national averages or metro-level data?

Use metro and submarket inputs whenever possible. National indicators like CPI and rental vacancy are useful context, but pricing, concessions, and operating cost pressure are local. National data should anchor your directional view, not replace on-the-ground comparables.

What is the biggest underwriting mistake right now?

Treating refinance risk as an exit-year check instead of a day-one constraint. The 2025 maturity cycle showed that debt structure can determine outcomes as much as business-plan execution (MBA, 2025). If takeout math is thin at acquisition, upside assumptions rarely fix it.

How many scenarios are enough?

Three is the minimum: base, downside, and severe. If your downside case only changes one variable, add a combined stress case where rent, occupancy, and expenses move together. Real-world stress almost never arrives one line item at a time.

Conclusion

The 2026 playbook is straightforward: standardize assumptions, prioritize debt and liquidity tests, and commit to written pass/fail thresholds. With policy still restrictive in early 2026 (Federal Reserve, 2026), teams that do this consistently make faster decisions, reject fragile deals earlier, and protect downside when capital markets stay uneven.

Sources

• Federal Reserve - Implementation Note (Jan 28, 2026)
• FRED - 10-Year Treasury Yield (DGS10)
• U.S. Bureau of Labor Statistics - CPI Summary (Jan 2026)
• U.S. Census Bureau - Housing Vacancies and Homeownership, Q4 2025
• MBA - Commercial and Multifamily Mortgage Maturities (Feb 2025)
• MSCI - Real Estate in Focus: US (Jan 2026)
• NCREIF - NPI Q4 2025 Press Release