Cap Rate Stress Testing: Why a 50bps Move Kills More Deals Than Rate Shocks
How a 50bps cap-rate move kills more deals than a 200bps rate shock — and how to model both.
The Math: Why Cap Rate Beats Rate Shock
A 200-basis-point interest rate shock raises annual debt service by roughly 25% on a 30-year amortizing loan. Painful, but cash flow absorbs it. A 50-basis-point exit cap rate move on the sale at year five hits valuation by roughly 7–8% — and on a leveraged deal, that 8% is borrowed against, so the equity hit is closer to 30–35%.
Worked example: $10M asset acquired at a 6% going-in cap on $600K NOI. 5-year hold. NOI grows 3% a year to $696K. At a 6% exit cap, sale price is $11.6M — comfortable equity multiple. At a 6.5% exit cap, sale price drops to $10.7M. At a 7% exit, $9.9M — you sell for less than you paid despite five years of NOI growth. The IRR collapses because the asset becomes worth less even as it earns more.
The asymmetry is structural. Rate shocks happen quarterly, are visible in real time, and can be hedged with rate caps. Cap-rate moves happen across cycles, are invisible until the listing hits the market, and cannot be hedged.
Three Cap-Rate Stress Tests That Matter
A defensible cap-rate stress test runs three scenarios in parallel. First, a static exit-cap shift: hold all else equal, sell at +50bps and +100bps higher than acquisition. This isolates the cap-rate impact from NOI growth. If the deal still pencils at exit cap +100bps, you have a margin of safety; if it doesn't pencil at +50bps, you're betting on cap-rate compression to make the deal work.
Second, a concurrent stress: exit cap +50bps while NOI underperforms by 5%. This is the realistic recession scenario — caps widen and rents soften at the same time. It is the test most operator models skip and the test most institutional underwriters require.
Third, a rate-environment stress: model the relationship between the 10-year Treasury at exit and the cap rate at exit. Historically, multifamily caps run 200–300bps over the 10-year. If the 10-year sells off another 100bps during your hold, your exit cap likely follows — and the income approach valuation has to reflect that.
Cap-Rate to Treasury Spread by Asset Class
The historical cap-to-treasury spread is the underrated input in long-hold underwriting. Multifamily averages a 250bps spread to the 10-year. Industrial averages 300bps. Office runs 400–500bps and is currently widening. Retail varies dramatically by sub-type — grocery-anchored is 350bps, while power-center retail can run 600bps+.
Mobile home parks and RV parks sit at 350–450bps spreads, with smaller-format parks pricing wider. Self-storage runs 250–350bps. Hospitality runs 500–700bps with significant chain-vs-independent dispersion. Knowing your asset class's historical spread tells you what cap rate is reasonable to underwrite for the exit, given a treasury assumption.
The macro implication: if you assume the 10-year stays at 4.0% during your hold, your exit cap is roughly your asset class's spread plus 4.0%. If you assume 5.0%, add another 100bps. Most operator models assume rates fall during the hold, which is a forecast — and forecasts are not stress tests.
How to Read a Cap-Rate Sensitivity Table
Every institutional underwriting includes a cap-rate sensitivity table that shows IRR and equity multiple at exit caps from -50bps to +100bps in 25bps increments. The single most useful number on that table is the breakeven exit cap — the cap at which the deal returns exactly 100% of equity. If the breakeven is materially below your underwriting cap, the deal has a margin of safety. If it's above, the deal needs cap compression to clear.
A good sensitivity also shows the breakeven on NOI at the underwritten cap. This is the percentage NOI shortfall you can absorb and still return capital. Deals with breakeven NOI shortfalls under 10% are fragile; under 5% is dangerous.
The table you don't see in broker decks is the joint sensitivity — exit cap and NOI moving together. Build that one yourself, or have your underwriting tool do it. It will tell you in a single grid which scenarios kill the deal and which scenarios you can survive.
Stress-Test Your Cap Rate Across +50 / +100 bps →
Every Full report ships with a cap-rate sensitivity grid showing IRR and equity multiple at exit caps from -50bps to +100bps — plus the joint NOI-and-cap stress most spreadsheets skip entirely.
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