Key takeaways

  • Property taxes are based on your home's assessed value multiplied by local tax rates.
  • You can appeal the assessed value, not the tax rate.
  • Appeal deadlines are short, often 30 to 90 days after notices are mailed.
  • Comparable sales and errors in your property record are the strongest evidence.
  • A successful appeal lowers your escrow payment at your servicer's next escrow analysis.

Property taxes are often the largest piece of an escrow payment, and they can rise sharply after reassessments. If your assessment overstates your home's value, an appeal is one of the few ways to directly lower your housing costs.

How property taxes are calculated

Your local assessor estimates your home's value, then applies any assessment ratio and exemptions. The taxable value is multiplied by the combined tax rate of local jurisdictions, such as county, city and school district. Many states cap annual assessment increases for homesteads, and many offer exemptions for primary residences, seniors, veterans and people with disabilities.

Step 1: check your property record

Look up your property card on your county assessor's website. Check for errors in square footage, bedrooms, bathrooms, lot size, finished basement, garage or condition. Simple factual errors are often the easiest wins.

Step 2: confirm exemptions

Make sure you're receiving every exemption you qualify for, especially a homestead exemption. Missing one can cost hundreds or thousands of dollars a year, and some states require reapplication.

Step 3: gather comparable sales

  • Find three to five similar homes that sold near your assessment date.
  • Choose homes close by with similar size, age, style and condition.
  • Note differences and how they affect value.
  • A recent appraisal from a purchase or refinance can be strong evidence.

Step 4: file before the deadline

Deadlines are strict and vary by jurisdiction, commonly 30 to 90 days after assessment notices are mailed. Many counties allow online filing. Include your evidence, photos of condition issues, and repair estimates if your home needs significant work.

Step 5: attend the hearing, if needed

Some appeals are resolved informally with the assessor's office. Others go before a local review board. Keep your presentation short and factual: here's what my home is worth, and here's the evidence.

Example: a home is assessed at $420,000, but three similar homes nearby sold for $382,000 to $395,000 around the assessment date. The owner also finds the county lists 2,300 square feet instead of the actual 2,050. The assessment is reduced to $390,000. At a 1.8% effective tax rate, the annual tax drops by about $540, lowering the escrow payment by about $45 a month.

Getting your escrow updated

Once the new tax bill is issued, send it to your mortgage servicer and ask for an escrow analysis. If you overpaid, a surplus may be refunded. See why your escrow payment changed.

Should you hire someone?

Property tax consultants often work on contingency, taking a percentage of first-year savings. For straightforward cases, many homeowners succeed on their own. Complex or high-value properties may benefit from professional help.

Exemptions worth checking

Exemption typeWho it's forNotes
HomesteadOwners who live in the home as their primary residenceOften reduces taxable value or caps annual increases
SeniorOwners above a certain age, often 65May include income limits or assessment freezes
Veteran / disabled veteranEligible veterans, often based on disability ratingSome states fully exempt 100% disabled veterans
DisabilityOwners with qualifying disabilitiesDocumentation required
Agricultural or conservationQualifying land usesRules vary widely

Eligibility and amounts vary by state and county. Your assessor's website lists available exemptions and application deadlines.

Common reasons appeals fail

  • Using list prices instead of sale prices. Assessors rely on closed sales, not asking prices.
  • Choosing poor comparables. Homes in a different school district, much larger lots, or very different condition weaken your case.
  • Arguing about the tax rate. Boards can only change your assessed value, not the rates set by local governments.
  • Missing the deadline. Late filings are usually rejected regardless of merit.
  • Relying only on an online estimate. Automated values rarely persuade a review board on their own.

Keep your evidence focused: three to five strong comparables, any factual errors in your property record, and documentation of condition issues that reduce value.

Frequently asked questions

Can my taxes go up if I appeal?

In some jurisdictions, the board can raise the value if evidence supports it. Make sure your evidence points to a lower value.

How long does an appeal take?

Anywhere from a few weeks to several months, depending on the county.

Do I still pay taxes during the appeal?

Usually yes. Your servicer keeps paying from escrow, and any refund is issued after the appeal is decided.