One of the most complex assumptions in multifamily underwriting is property tax reassessment, particularly as it relates to exit year NOI.
Many models handle tax reassessment correctly at acquisition, then quietly ignore it at exit. The buyer will likely make that adjustment when making their offer. As such, not addressing it upfront may result is an inflated exit NOI, an artificially low exit cap rate, and projected returns that look better on paper than they are likely to be in reality.
This is not a rounding error. It is a structural underwriting decision.
What Exit NOI Is Actually Meant to Represent
Exit NOI is not your trailing twelve-month NOI and it is not a seller’s view of performance.
It is a forward-looking, normalized income stream that reflects what the next owner will reasonably earn after accounting for market rents and stabilized expenses.
That distinction matters.
If the next buyer will face higher property taxes as a result of the sale, then excluding that expense from exit NOI impacts exit valuation.
A Common Question: Is Tax Reassessment Already Captured by Exit Cap Rate Expansion?
This is one of the most frequent pushbacks I hear, and it is an important question to address directly.
The short answer is no.
Exit cap rate expansion and tax reassessment address two different underwriting mechanics and should not be used interchangeably.
Cap Rates Price Market Risk
Exit cap rates reflect:
- Interest rate environment
- Capital market liquidity
- Investor risk tolerance
- Asset class and location dynamics
They are blunt market signals. They are not designed to adjust for specific, deterministic operating expenses.
Taxes Adjust NOI Reality
Tax reassessment is a mechanical cost reset triggered by the transaction itself in many jurisdictions. Buyers do not compensate for that by widening the cap rate. They normalize NOI first and then apply a market cap rate to that adjusted income stream.
In other words:
Cap rates price risk.
NOI reflects reality.
Using cap rate expansion to “absorb” tax reassessment assumes buyers price known expenses indirectly. In practice, they do not.
When Tax Reassessment Should Be Included in Exit NOI
In most multifamily transactions, tax reassessment should be included in exit NOI.
1. Jurisdictions Where Sale Triggers Reassessment
If ownership change resets assessed value, the next buyer will inherit a higher tax bill. That cost reduces stabilized NOI and therefore value.
Ignoring it inflates exit pricing assumptions.
2. Deals Assuming Value Creation
If you are projecting rent growth, expense optimization, or renovation-driven NOI expansion, it is inconsistent to assume taxes remain tied to a lower historical basis.
Value growth without tax normalization is incomplete underwriting.
3. Institutional or Sophisticated Buyer Profiles
Experienced buyers underwrite post-sale taxes explicitly. Exit models that ignore reassessment often fail to clear real-world bid scrutiny.
When Excluding Reassessment May Be Reasonable (With Care)
There are limited scenarios where exclusion can be justified:
- Jurisdictions without sale-based reassessment or with strict caps on increases
- Situations where reassessment timing materially lags the sale
- Short hold strategies with minimal repricing assumptions
- Large exit cap rate expansion that creates additional cushion relative to NOI impact of a tax reassessment
Even in these cases, the assumption should be verified and disclosed, not implied.
Best practice is to show:
- Exit NOI with reassessment
- Exit NOI without reassessment
- The valuation impact of the difference
Transparency strengthens credibility.
Common Underwriting Pitfalls
Across deal reviews, the same mistakes repeat:
- Including reassessment at acquisition but not at exit (especially if exit cap rates are flat)
- Relying on trailing taxes to support exit NOI
- Assuming cap rate expansion substitutes entirely for expense normalization
- Failing to disclose tax assumptions to investors
Each of these quietly inflates projected returns without improving underlying deal quality.
A Simple Rule of Thumb
If a cost is triggered by the transaction itself, it belongs in NOI, not in the cap rate.
Conservative underwriting does not make deals worse. It makes weak assumptions visible.
Why This Matters to Passive Investors and Students
As a passive investor or developing underwriter, you should always ask:
- Are exit taxes normalized?
- Is exit NOI reflective of post-sale reality?
- Does the exit valuation still work after reassessment?
These questions often reveal more about deal quality than headline IRRs.
Final Thought
Tax reassessment at exit is not a technical footnote. It is a valuation driver.
Exit cap rate expansion does not replace it. It complements it.
Deals that survive conservative, reality-based assumptions are the ones that hold up through market cycles and real dispositions.
Vessi Kapoulian
Breaking down multifamily underwriting one step at a time to create educated and empowered investors