It's a question I hear all the time from home buyers.

They're comparing two homes on the same street. The houses look nearly identical. They're in the same school district, served by the same municipality, and even built around the same time. Yet one property pays $3,000 per year in taxes while the other pays $7,000 or more.

How is that possible?

The answer is that property taxes aren't determined solely by what a home is worth today. Several factors go into calculating a property's tax bill, and understanding those factors can help buyers make more informed decisions when purchasing a home.

How Property Taxes Are Calculated

At its most basic level, property taxes are determined by two main components:

Assessed Value × Tax Rate = Property Taxes

The assessed value is the value assigned to the property by the local taxing authority. The tax rate is established by the municipality, county, school district, and other local taxing bodies.

While that sounds simple enough, the assessed value is where things can become complicated.

Assessed Value Is Not Always the Same as Market Value

Many people assume that if two homes would sell for roughly the same price, they should have similar property taxes. In reality, that's not always the case.

The assessed value of a property may have been established years ago and may not reflect current market conditions. In some areas, assessments are updated regularly. In others, reassessments may occur infrequently.

As a result, two homes with similar market values can have significantly different assessed values, leading to very different tax bills.

Reassessments Can Create Major Differences

One of the most common reasons neighboring homes have different tax bills is reassessment history.

For example, one homeowner may have purchased their property recently and triggered a reassessment. Another homeowner may have owned their property for decades without any significant change to their assessment.

Even though the homes are similar today, their tax histories may be very different.

Renovations and Improvements Matter

Property improvements can also affect taxes.

Projects such as:

  • Home additions
  • Finished basements
  • Swimming pools
  • Detached garages
  • Major renovations

can increase a property's assessed value.

If one homeowner has invested heavily in upgrades while another has not, the tax bills may reflect those differences even if the homes appear similar from the street.

Some Homeowners Successfully Appeal Their Assessments

Property owners often have the right to appeal their assessment if they believe it is inaccurate.

In some cases, a successful appeal can reduce the assessed value and lower the annual tax burden.

As a result, two nearly identical homes may have different tax bills simply because one owner challenged their assessment while the other did not.

Exemptions and Tax Relief Programs

Certain homeowners may qualify for tax relief programs or exemptions that reduce their property tax burden.

These programs vary by location and may apply to owner-occupied properties, senior citizens, veterans, or other qualifying groups.

When comparing tax records, it's important to determine whether any exemptions are affecting the amount currently being paid.

Property Records Aren't Always Perfect

Believe it or not, assessment records sometimes contain errors.

A county's records may indicate a property has more square footage than it actually does, an additional bathroom that no longer exists, or other inaccuracies that can impact assessed value.

These errors are uncommon, but they do occur and can contribute to differences between neighboring properties.

Why This Happens So Often in Pennsylvania

Here in Pennsylvania, property taxes can be especially confusing.

Many counties do not reassess properties on a regular schedule. As home values rise and neighborhoods change, assessed values may not keep pace with the market.

This can create situations where two very similar homes have dramatically different assessments and tax bills based largely on when they were assessed and what changes have occurred over time.

For buyers, this means it's important to look beyond the home's asking price and carefully review the property's tax history.

What Buyers Should Pay Attention To

When comparing homes, don't assume that a neighbor's tax bill tells the whole story.

Instead, consider:

  • The property's current assessment
  • Recent assessment changes
  • Any exemptions currently applied
  • The property's tax history
  • The likelihood of future reassessments

Property taxes can have a significant impact on your monthly housing costs, sometimes as much as changes in mortgage interest rates.

The Bottom Line

Two homes can look nearly identical and still have vastly different property tax bills.

Differences in assessments, reassessments, renovations, appeals, exemptions, and local tax policies all play a role in determining what a homeowner pays each year.

That's why it's important to understand the numbers behind the tax bill rather than simply comparing one property to another. A little research today can help prevent surprises after closing and give you a clearer picture of the true cost of homeownership.