Property taxes are frequently the largest single operating expense on a multifamily or commercial property, and they are the one most owners assume is fixed. It is not fixed. Assessments are opinions of value, and opinions can be challenged.

What follows is not a guide to arguing valuation. That work belongs to tax counsel, appraisers, and specialist consultants, and this article does not attempt to replace them. It covers the part that sits squarely with the property manager and determines whether their work succeeds: the evidence, and the calendar.

Both fail more often than the valuation argument does. A note before going further: this is general background, not tax or legal advice. Assessment law, deadlines, and evidence rules vary by state and county, and specific decisions belong with qualified professionals.

Why This Lands on the Property Manager

Ask who owns property tax appeals in most management companies and the answer is usually the owner, or their accountant, or a consultant engaged on contingency.

That is true of the argument. It is not true of the inputs. An appeal on an income-producing property is built almost entirely out of records the management company produces, on a deadline nobody outside the company is tracking.

1. The Evidence Is Operating Data

Appeal boards want to see the property's actual financial performance, and they are specific about it.

Philadelphia's Board of Revision of Taxes, to take one published example, requires appellants on certain commercial properties to submit annual income and expense statements for the past two years with explanatory notations and schedules, a schedule of operating expenses covering items such as heating, repairs, maintenance, insurance, and water and sewer, photographs of the property from several aspects, and a plan locating all buildings on the site.

Read that list again as a property manager. Every item is something you produce or hold. None of it is something an appraiser can generate on your behalf if your records are incomplete or inconsistent between years.

2. The Deadlines Are Statutory and They Vary

Appeal windows are set by statute, usually fall in the first half of the year, and differ by jurisdiction. Miss one and the assessment stands for the cycle regardless of how wrong it is.

For a single-market operator this is one date. For a portfolio across several counties it is a calendar, and calendars of external deadlines with no internal owner are the ones that get missed. It is the same failure mode as compliance filings: the work is not difficult, but nobody's job description contains it.

How Assessors Value Income Property

Understanding the method matters because it tells you which of your numbers the assessment actually turns on. Assessors generally work from three approaches: comparable sales, cost to replace less depreciation, and the income approach. For rental property, the income approach usually dominates.

CBIZ describes that approach as evaluating market rental rates, expenses, vacancy levels, and operating costs to determine net operating income, which is then capitalised at a market-based rate, as of a specific valuation date such as 1 January. So the assessment is, in effect, your NOI divided by a cap rate. Which produces an uncomfortable implication.

The Part Nobody Enjoys Explaining

If assessed value is derived from net operating income, then improving NOI raises the assessment, and therefore the tax, which reduces NOI. That is not an argument for running properties badly. The gain from higher income and controlled expenses far exceeds the tax drag in almost every case. But it does mean two things worth saying out loud to owners.

First, a good year can produce a tax increase that arrives later and feels like a penalty. Better to predict it than to explain it.

Second, and more practically, the accuracy of your expense reporting matters in both directions. Expenses that are understated, misclassified as capital when they were operating, or omitted because they sat in a different entity, all inflate the NOI the assessor sees and therefore the value assigned. Sloppy books do not merely look unprofessional at appeal. They actively raise the assessment.

That is the strongest argument for clean reporting that most managers never make. Our guide to property management financial reports covers the underlying statements.

What to Have Ready

The work that decides an appeal happens long before the filing window. Four things, and the first is most of it.

1. Two Years of Consistent Income and Expense Statements

Consistency matters as much as accuracy. If an expense was classified one way in the first year and another way in the second, the trend the assessor sees is noise, and the appeal loses the argument it was meant to make.

Reconcile the statements to the general ledger, note anything unusual, and be able to explain every material variance. Anything you cannot explain, an assessor will interpret unfavourably.

Watch three things in particular. Capital work misclassified as operating expense, which understates the value being preserved and invites a challenge to the whole statement. One-off items presented without explanation, such as a large legal cost or an insurance recovery, which distort the trend if unlabelled. And expenses paid from a different entity, common in portfolios with separate ownership vehicles, which quietly remove real costs from the property's reported performance and inflate the NOI an assessor derives from it.

2. A Rent Roll That Shows Reality

Contract rent is not effective rent. Concessions, free-rent periods, and tenant improvement allowances all reduce actual income, and if they are invisible in your reporting the assessment reflects income the property never received.

Make them visible and documented. This is one of the most common sources of overassessment on residential and commercial property alike.

3. Vacancy and Market Evidence

Actual vacancy for the period, with the reason where it is unusual, plus submarket evidence: comparable rents, absorption, concessions being offered nearby.

The assessor is applying a market vacancy assumption. If your actual experience is worse and you can evidence why, that is the argument.

The evidence needs to distinguish between market conditions and your own performance, because only the first supports a lower value. A property vacant because the submarket has absorbed nothing for two quarters is making a valuation argument. One vacant because turns took ninety days is making a different point entirely, and an assessor is entitled to say so. Be honest with yourself about which you have before presenting it.

4. Condition and Deferred Capital

Documented physical condition, outstanding capital requirements, and any regulatory work the building faces all bear on value.

A building carrying a known roof replacement, or facing an emissions cap it does not currently meet, is worth less than an identical building without those obligations. That evidence comes from inspection records and capital plans, and it is only persuasive if it existed before the appeal rather than being assembled for it. Our operating cost benchmarks provide context for whether a property's expense profile looks reasonable against comparable portfolios.

Deciding Whether to Appeal

Not every assessment is worth challenging, and a manager who forwards every notice to a consultant is not adding judgement.

Three questions settle most cases. What is the annual saving if the assessment falls to a defensible value, and does it justify the effort and fees? How long does the reduction persist, since in many jurisdictions a successful appeal holds until the next reassessment cycle, which makes a modest annual saving considerably more valuable than it first appears? And is there evidence, or only a feeling that the number looks high?

That third question is where most appeals die. An assessment that is genuinely out of line usually shows it: actual income materially below the assumed level, vacancy above the market assumption, a classification error, or a comparable that does not compare. If none of those is present, the appeal is an argument about cap rates, which is a specialist exercise with a lower success rate.

Two practical notes for owners. Many consultants work on contingency, which removes the cost objection but not the time cost of assembling evidence, and that time is yours. And in some jurisdictions a review can result in the assessment being confirmed or, occasionally, revisited upward. That risk is usually small and worth understanding before filing rather than after.

Building the Calendar

Three things, none of them difficult, all of them commonly absent. Record the assessment appeal deadline for every jurisdiction where you manage property, alongside the assessment notice date, since the window usually opens when the notice is issued.

Name one person per jurisdiction, with a backup. Not a department. Diarise a review of every assessment notice as it arrives, not when the deadline approaches. The notice is the trigger, and the interval between notice and deadline is frequently short.

What This Article Does Not Cover

Deliberately, the valuation argument itself. Choosing between the three approaches, selecting comparables, arguing the cap rate, deciding whether to settle informally or proceed to a board hearing or to court: all of that is specialist work, and the specialists earn their fees. Many work on contingency, which makes the decision to engage them straightforward for an owner.

What they cannot do is fix records that were never kept, or file after a window has closed. The division of labour is clean, and the manager's half arrives first.

Where the Technology Comes In

An appeal is a request to produce two years of clean, reconciled, explicable financial history for a single property, alongside occupancy, concessions, condition, and capital obligations, within a window that may be weeks long.

That is easy where operational and financial data share a record and difficult where they do not. Most of the delay in assembling an appeal package comes from reconciling an operating report against a ledger that disagrees with it, or from finding concession terms that live in a leasing system nobody has connected to accounting.

That is the problem RIOO is built for, and the split is worth being precise about:

• Leasing, lease administration, maintenance, inspections, and capital works run inside RIOO as a purpose-built property management layer, so occupancy, concessions, and condition history sit against the property.

• Finance, multi-entity accounting, consolidation, and reporting are handled by the NetSuite core RIOO is built on, which is where that depth is native.

• Both draw on one record, so property-level income and expense statements reconcile by construction rather than by effort.

The practical effect is that an appeal package is an extract rather than a reconstruction. RIOO runs more than 180,000 units under management across residential and commercial portfolios on that architecture.

Where to Start

Take your largest property by assessed value and produce, as an exercise, the package described above: two reconciled years of income and expense, a rent roll showing concessions, actual vacancy with explanation, and documented condition.

Time how long it takes. That number is your real constraint, and if it exceeds the appeal window in that jurisdiction, you have found the problem before it cost anybody money.

Book a RIOO Demo

RIOO keeps property operations and financials on one record, so income and expense statements reconcile without assembly. Book a demo and see how it works across a multi-jurisdiction portfolio.

Frequently Asked Questions

1. Who is responsible for property tax appeals, the owner or the manager?
The valuation argument generally sits with the owner and whichever tax counsel, appraiser, or consultant they engage. The evidence and the deadline sit with the manager, because appeal boards require operating data the management company produces: income and expense statements, rent rolls, occupancy, and property condition. A specialist cannot compensate for records that were never kept or a filing window that closed.

2. What documents are needed for a commercial property tax appeal?
Requirements vary by jurisdiction, but commonly include two years of income and expense statements with explanatory notes, a schedule of operating expenses, a current rent roll showing concessions and free-rent periods, actual vacancy figures, photographs of the property, and evidence of condition or outstanding capital requirements. Philadelphia's Board of Revision of Taxes, for example, specifies two years of income and expense statements, an operating expense schedule, photographs from several aspects, and a site plan for certain commercial appeals.

3. How do assessors value apartment buildings and commercial property?
Usually through some combination of comparable sales, replacement cost less depreciation, and the income approach. For income-producing property the income approach typically dominates: market rents, expenses, and vacancy are used to derive net operating income, which is then capitalised at a market rate as of a fixed valuation date. That means the assessment is closely tied to the property's reported financial performance.

4. Does improving NOI increase property taxes?
Where the income approach is used, higher net operating income generally supports a higher assessed value and therefore a higher tax. The gain from stronger performance almost always exceeds the tax drag, so this is not a reason to run a property badly. It is a reason to forecast the effect for owners rather than letting a tax increase arrive unexplained, and a reason to ensure expenses are completely and correctly reported, since understated expenses inflate the NOI an assessor sees.

5. When are property tax appeal deadlines?
They are set by statute and vary by state and county, typically falling in the first half of the year and often tied to the date the assessment notice is issued. Because the interval between notice and deadline can be short, the practical control is to review each notice on arrival rather than working back from the deadline, and to hold a per-jurisdiction calendar with a named owner for each entry.