A commercial property tax assessment appeal comes down to three things:

• filing by the jurisdiction's deadlines

• an evidence file built from the property's actual income and expenses

• a clear decision about who pays for the appeal, and who receives any refund under the leases

Run it as an annual calendar, not a scramble when the tax bill arrives.

For example: the assessment notice for a 120,000-square-foot office building arrives in March, in a stack of mail. The asset manager reads it in April and thinks the assessed value is well above what the building's income supports.

Then come the questions nobody has answers to:

• When is the appeal deadline?

• Was the income and expense filing the city asks for ever sent?

• If the appeal wins, does the refund belong to the owner, or to the tenants who paid the taxes through their NNN charges?

The value might well be too high. The bigger risk is that the team finds out about the deadline after it's passed.

Why is a tax appeal a property team job?

Because much of the evidence lives in the property's own records. Assessors can value commercial property using income, cost or sales comparisons, and for income-producing property, the income and expenses are often central to the argument.

Two examples show how closely the records are tied in:

• Rhode Island: the state's assessment appeal form points commercial and industrial owners, and owners of residential properties with six or more units, to an income and expense section to attach where applicable.

• New York City: owners of income-producing properties with an actual assessed value above $40,000 must file a Real Property Income and Expense (RPIE) statement each year. Properties assessed at $750,000 or more must add a rent roll. New York City also says plainly that to keep your right to appeal to the Tax Commission, you must file your RPIE on time.

In both cases, the appeal is only as strong as the operating statement and rent roll behind it, and those come from the property team.

The appeal calendar

This is the framework: every property gets four dates, where they apply, in one portfolio calendar, every year.

Deadlines vary widely, sometimes within a single county. Cook County in Illinois, for example, runs separate appeal windows township by township. New York City's RPIE deadline was June 1, 2026, and late or missing filings can bring penalties of up to 5% of the property's actual assessed value.

So the calendar is built property by property, from each jurisdiction's own rules, not from a single portfolio-wide date.

What goes in the evidence file?

Build it before the appeal is filed, from the same records the books close from:

• The operating statement: income, expenses and net operating income, usually for the last full year or the trailing twelve months.

• The rent roll: occupancy, rents and lease expirations.

• Vacancy and concessions: free rent, vacancy and collection loss the assessor may not see.

• Condition: photos and repair estimates for any deferred maintenance or physical problems.

• Record errors: square footage, use class or features recorded wrongly on the assessor's property card.

• Market evidence: comparable sales and rents, usually prepared by the tax adviser or appraiser.

Much of this is the same material the controller already prepares for lenders. RIOO's guide to the quarterly lender reporting package covers how to tie the T-12 and rent roll to the books.

Who decides whether to appeal?

The asset manager, with the owner and a tax adviser, and the lease structure shapes the decision.

That incentive problem is real. Owners of single-tenant leased properties often have little reason to appeal, because all of the taxes pass directly to the tenant. In multi-tenant retail, the landlord carries the full cost of an appeal but keeps the savings mainly on vacant space. Some leases address this by requiring the landlord to appeal, or by giving tenants the right to.

Before deciding, compare the gap between the assessed value and what the income supports with the cost of the appeal, including any contingency fee for the tax adviser.

What happens to a refund?

Read each lease's tax clause first. Where tenants paid taxes through their recoveries, a successful appeal often means part of the refund belongs to them.

Lease language often makes this explicit. One sample tax clause requires the landlord to credit each tenant's pro-rata share of any tax refund, net of reasonable appeal costs, within 60 days.

Two details trip up the accounting:

• Use the shares from the year that was appealed, unless the lease says otherwise. Distribute the refund based on each tenant's pro-rata share during the protested tax year, not their current share. Tenants who have since left may be owed money too.

• Net out the appeal costs only if the lease allows it. Some leases let the landlord recover reasonable appeal costs from the refund. Others don't.

RIOO's guide to NNN recoveries and expense pass-throughs covers how recoveries are calculated and reconciled.

Who owns each step?

What should leadership watch?

Property tax is one of the largest operating costs in most commercial portfolios, and RIOO's guide to setting up a property management chart of accounts recommends keeping it in its own account, so the effect of a tax appeal is easy to see.

Three things are worth reviewing every year:

• Calendar coverage. Every property has its notice, filing and appeal dates on record.

• Tax as a share of NOI, by property. A property whose tax burden is climbing faster than its income is a candidate for review.

• Refunds passed through. Every refund from a successful appeal has been credited to the tenants who were owed a share.

And one control question: for every property in the portfolio, can the team name the next appeal deadline today? If the answer depends on the next envelope that arrives, the calendar isn't doing its job.

Where RIOO fits

RIOO is property management software built directly on NetSuite.

• Recoveries handled for commercial portfolios. RIOO handles percentage rent, CAM reconciliation, multi-tenant billing and lease escalations for commercial, industrial and retail properties, so tenant tax recoveries are billed through the same system as the rest of the lease.

Note: This blog is operational guidance, not tax or legal advice. Assessment and appeal rules are set by each state, county and city, and they change. Last reviewed October 2026. Confirm the rules for each property with a qualified tax adviser.

Frequently asked questions

Q1. What is a commercial property tax assessment appeal?
A formal challenge to the value a local assessor has placed on a commercial property for tax purposes. If the appeal succeeds, the assessed value, and the tax bill based on it, is reduced.

Q2. When is the deadline to appeal a property tax assessment?
It depends on the jurisdiction. Deadlines are set by each state, county or city, and some counties run different windows for different areas. Check each property's deadline every year.

Q3. What evidence is used in a commercial property tax appeal?
Usually the property's operating statement and rent roll, vacancy and concession data, condition evidence, any errors on the assessor's records, and comparable sales or rents.

Q4. Does an income and expense filing affect the right to appeal?
In some places, yes. In New York City, owners required to file an RPIE statement must file it on time to keep their right to appeal to the Tax Commission.

Q5. Who should decide whether to appeal?
Usually the asset manager, with the owner and a tax adviser. The decision weighs the expected tax saving against the cost of the appeal, and the lease structure decides who benefits.

Q6. Do tenants get part of a property tax refund?
Often, if they paid taxes through their lease recoveries. The lease's tax clause decides, and some require the landlord to credit each tenant's share, net of reasonable appeal costs.

Q7. Can a tenant appeal the property tax assessment?
Sometimes. A tenant that pays the taxes, such as a single tenant under an NNN lease, may have the right to appeal, depending on the lease and local law.

Q8. How is a refund split among tenants?
Usually based on each tenant's pro-rata share during the tax year that was appealed, not its current share, unless the lease says otherwise. That can mean crediting tenants who have since moved out.