Property Taxes on a Rental: Reassessment and Appeals

The expense most likely to be wrong in your analysis, because the number on the current bill may not be the number you will pay.

1.25% → 1.6%

A reassessment of that size takes DSCR from 1.07 to 1.01.

How the bill is built

Tax = Assessed value × Assessment ratio × Total millage rate − Exemptions

Assessed value is the county's figure, which may be a fraction of market value. The rate is set by overlapping districts — county, city, school, fire, library.

Three of those four terms can change when you buy, which is why this is the expense most likely to be wrong in a pro forma. The assessed value may be reset to your purchase price. The exemptions attached to the previous owner vanish. Only the millage rate is genuinely shared, and it drifts upward most years.

Reassessment: the surprise that is entirely knowable

Jurisdictions handle a sale in one of three broad ways, and which one you are in determines how much homework you owe yourself:

Regime	What happens when you buy	What to budget
Acquisition-value systems	The property is reassessed at or near your purchase price.	Your price × the local effective rate. The current bill is close to irrelevant.
Periodic mass reappraisal	Values reset on a cycle for everyone, not on sale.	The current bill, plus the expected step at the next reappraisal.
Capped-growth systems	Annual increases are limited for the existing owner, and the cap often resets on sale.	The uncapped value — a long-held property can carry a very large step.

One phone call settles it

Call the county assessor before your contingency expires and ask a single question: “If this property sells at $X, how will it be assessed for the next tax year?” They answer this every day. It is the cheapest piece of diligence available and it routinely moves the expense line by thousands. It is on the diligence checklist for exactly this reason.

What it does to the deal

The $240,000 example, reassessed from 1.25% to 1.6% of value

Taxes at 1.25%: $3,000
Taxes at 1.6%: $3,840
NOI: $15,004 → $14,164
Cap rate: 6.25% → 5.90%
DSCR: 1.07 → 1.01
Annual cash flow: $995 → $155

A 0.35-point tax change removes 84% of the cash flow.

Nothing about the property changed. No tenant left, no roof failed. This is why property taxes deserve the same scrutiny as rent — and why a deal underwritten on a long-held owner’s frozen assessment can be a completely different deal in your hands.

Effective rates vary more than anything else in the model

Effective rate on market value	Annual tax on $240,000	As a share of $25,200 gross rent
0.4% (low-tax states)	$960	3.8%
0.8%	$1,920	7.6%
1.25% (the example)	$3,000	11.9%
1.8%	$4,320	17.1%
2.2% (highest-tax jurisdictions)	$5,280	21.0%

Effective rate means tax paid divided by market value — the only figure comparable across jurisdictions, since assessment ratios differ.

A five-fold spread on a single expense line is larger than the spread on anything else you will model. It is also the main reason cap rates differ between metros that otherwise look similar, and why the 50% rule needs adjusting by jurisdiction rather than applied as a constant.

Appealing an assessment

Assessments are frequently wrong, and appealing is usually free or nearly so. It is the highest-return hour in increasing NOI, because a successful appeal is permanent and costs nothing to maintain.

1Find your deadline first. Appeal windows are short — often 30 to 60 days after notices go out — and missing it costs you a full year.
2Check the record card for factual errors. Wrong square footage, a bathroom that does not exist, a finished basement that is not finished. These are the easiest wins and the most common.
3Pull assessments of comparable neighbouring properties. Uniformity — being assessed higher than similar homes — is a valid ground in most jurisdictions and is often easier to prove than market value.
4Use your purchase price if it helps you. Buying below the assessed value is strong evidence. If you paid above it, do not volunteer that argument.
5For income property, consider the income approach. Some jurisdictions accept an NOI-based valuation, which can be favourable when the assessor has used residential comps on a rental.

Appeal after buying, not before

A recent arm’s-length sale is the best evidence of market value there is — and if you bought below the assessment, the appeal practically writes itself. Many investors appeal in the first cycle after purchase as routine, and a successful reduction flows straight through to NOI, cap rate and value.

Whatever number you land on, put the reassessed figure into the calculator, not the current bill. Alongside insurance, it is one of the two expenses most likely to be materially wrong on day one.

Frequently asked questions

Do property taxes go up when you buy a rental property?

Often, yes. Many jurisdictions reassess at or near the sale price when a property changes hands, and any homestead, senior or long-term-owner exemptions the seller held do not transfer. Ask the county assessor directly how a sale at your contract price will be treated.

How much are property taxes on a rental property?

Effective rates commonly run between about 0.4% and 2.2% of market value depending on the jurisdiction, which on a $240,000 property means anywhere from roughly $960 to $5,280 a year. That spread is wider than any other line in a typical pro forma.

Can you appeal property taxes on a rental?

Yes, and the process is usually free or low-cost. The strongest grounds are factual errors on the property record, uniformity — being assessed higher than comparable neighbours — and a recent arm's-length purchase below the assessed value. Appeal windows are short, so find the deadline first.

Are property taxes included in NOI?

Yes. Property taxes are an operating expense and sit above the NOI line, unlike the mortgage payment. If your lender escrows taxes with the loan payment, take care not to count them twice.