Rob Hartley

Founder, AppealDesk · Published June 28, 2026

You just bought a home. The ink on the closing documents is barely dry — and now you're staring at a property tax bill that feels like it was designed to make you regret the whole thing. You're not alone, and you're not powerless.

Here's what most real estate agents don't tell first-time buyers: the assessed value on your new home may have nothing to do with what you actually paid for it — or what it's worth today. And that gap between the county's number and reality is exactly where your savings live.

This guide walks you through every legitimate strategy for lowering your property taxes after buying a house, from claiming exemptions you may not know about to filing a formal appeal if your home was overassessed at purchase.

Why Your First Tax Bill Might Be Wrong

Property tax assessments are set by your county assessor, not by your lender, your real estate agent, or the market. Assessors update valuations on different schedules — some annually, some every three to six years — which means the assessed value on your new home could be based on outdated data.

In some states, purchasing a home triggers an automatic reassessment at or near the sale price. In others — most notably California under Proposition 13 — the previous owner's assessment carries over until specific conditions are met. In still others, the assessment lags the market by a year or more.

The result: many new homeowners end up paying taxes on a number that doesn't reflect the home's current fair market value, the condition of the property, or comparable sales in the neighborhood. The National Taxpayers Union Foundation estimates that 30 to 60 percent of U.S. properties are overassessed. New homeowners are frequently among them.

Step 1: Claim Every Exemption You're Entitled To

Before anything else, make sure you've claimed the exemptions available to you. These don't require proving your home is overassessed — they simply reduce your taxable value because of who you are or how you use the property.

Homestead Exemption

If your new home is your primary residence, you almost certainly qualify for a homestead exemption. This reduces your taxable assessed value by a fixed amount — often $25,000 to $100,000 depending on the state — and can also cap how much your assessment can increase year over year.

The critical detail: you have to file for it. Most counties don't automatically grant homestead exemptions when you close. You need to submit an application — usually to the county assessor or property appraiser — by a specific deadline after purchase. Miss the deadline and you lose the exemption for that tax year.

Common homestead exemption values by state:

Texas: $100,000 reduction in taxable value for school district taxes (plus a 10% assessment cap)
Florida: Up to $50,000 reduction, plus the Save Our Homes cap (3% annual increase limit)
Georgia: Varies by county, typically $2,000 to $10,000
Illinois: $10,000 reduction in equalized assessed value (Homeowner Exemption)
California: $7,000 reduction in assessed value (modest, but still worth claiming)

To claim your homestead exemption, contact your county assessor's office or visit their website. Most applications are one page and require proof that the property is your primary residence (a copy of your closing disclosure and a driver's license with the new address typically suffices).

Other Exemptions Worth Checking

Depending on your situation, you may also qualify for:

Veteran exemptions: Many states offer substantial reductions for veterans, with some providing full exemptions for disabled veterans
Disability exemptions: Available in most states for homeowners with qualifying disabilities
Senior exemptions: If you're 65 or older, your new home may qualify for additional reductions or assessment freezes — even if you just moved in
Agricultural exemptions: If the property includes significant acreage used for farming or ranching, a different (lower) assessment method may apply

Step 2: Review Your Assessment Notice Carefully

After closing, you'll receive a notice of assessment from your county. This is the document that tells you what the county thinks your home is worth for tax purposes — and it's the most important piece of mail you'll get as a new homeowner.

When you receive it, check four things:

The assessed value versus what you paid. If your assessed value is significantly higher than your purchase price — and you bought at arm's length in a normal sale — that's a red flag worth investigating.
Your property details. Pull up your property record card (available on your county assessor's website or by request). Check that the square footage, bedroom and bathroom count, lot size, and year built match your actual home. Errors are common and they inflate your assessment.
The assessment ratio. Many states don't assess at 100% of market value. If you're in a ratio state, the math works differently. Your assessed value should equal your market value multiplied by the ratio — not your full market value. If it doesn't, you may be overtaxed even if your assessed value looks reasonable on its face.
The appeal deadline. It's usually printed on the notice. Miss it and you wait another year.

Step 3: Compare Your Assessment to Recent Sales

The most powerful evidence in any property tax appeal is comparable sales — recent sales of similar homes in your neighborhood that suggest your assessed value is too high.

As a new homeowner, you have one specific piece of evidence that most other appellants don't: your own purchase price. If you paid $380,000 for your home in an arm's-length transaction (not a foreclosure, estate sale, or sale between family members), and your assessment now shows $430,000, your closing disclosure is exhibit A.

Courts and appeal boards in most states treat a recent arm's-length sale as strong evidence of a property's fair market value — often the strongest evidence available. The assessor's job is to estimate what your home would sell for. You have an actual data point.

To build a complete case, supplement your sale price with 3 to 5 comparable sales from the past 6 to 12 months. Look for homes that are similar in:

Square footage (within 20%)
Number of bedrooms and bathrooms
Year built
Lot size
General neighborhood or subdivision

Sources for comparable sales include Zillow, Redfin, your county's online property search tool, and your real estate agent (who can pull MLS data). If those comparable sales suggest a lower market value than your assessed value implies, you have grounds for an appeal.

Step 4: File an Appeal If the Numbers Support It

If your review turns up evidence that your assessed value exceeds your home's fair market value — your purchase price, comparable sales, property record errors, or a combination — filing a formal appeal is straightforward and worth doing.

The process varies by state but generally follows this pattern:

Gather your evidence. Your closing disclosure, comparable sales analysis, photos of any condition issues, and corrected property details.
File before the deadline. Deadlines range from 30 days after your assessment notice to a fixed calendar date (April 1 in New Jersey, November 30 in California). Miss it and you wait a year.
Attend the informal review. Many counties offer an informal meeting with an assessor before a formal hearing. In Texas, roughly 85% of protests are resolved at this stage. Bring your evidence and present it clearly.
Attend the formal hearing if needed. If the informal review doesn't resolve your case, you'll present to a review board. It's typically 15 to 20 minutes, no lawyer required, and the evidence you've already gathered is everything you need.

One thing new homeowners often worry about: can appealing cause my assessment to increase? In most states, no. The assessor generally cannot raise your assessment as a result of your appeal. You're asking them to justify their number, not inviting them to look for reasons to charge you more.

How Much Can You Save?

The math on a successful appeal compounds quickly. On a $400,000 home with a 1.5% effective tax rate, every $10,000 reduction in assessed value saves $150 per year. A $40,000 reduction — completely achievable if your assessment is meaningfully off — saves $600 annually.

In states where assessments are only updated every three to six years, that savings locks in for the entire cycle. A $600-per-year reduction over four years is $2,400 back in your pocket from a single appeal filed in your first year of homeownership.

And if you also claim a homestead exemption you hadn't yet filed for? Those savings stack.

Common Mistakes New Homeowners Make

Assuming the assessed value is correct. It's an estimate, produced by a mass appraisal model processing thousands of properties. Individual errors are the rule, not the exception.

Missing the homestead exemption deadline. In most states you have a window — often 30 to 90 days after purchase, or by a specific date in the tax year — to file. After that, you wait until next year.

Waiting for a reason to appeal. You don't need to wait until your taxes increase dramatically. If your assessed value is too high right now, you can appeal right now. Your purchase price alone may be enough evidence.

Confusing market value with assessed value. In many states, these are different numbers by design. Know your state's assessment ratio before drawing conclusions.

Missing the appeal deadline. Every county has one. It's usually printed on your assessment notice. If you miss it, you start over next year.

The Bottom Line

Lowering your property taxes after buying a house is not complicated — it just requires knowing what to look for and acting before your deadlines pass. Start by claiming your homestead exemption if you haven't already. Then pull your assessment notice, check your property record for errors, and compare the implied market value to what you paid and what similar homes sold for.

If the numbers don't add up, you have a case. And in most states, building and filing that case takes a few hours and costs nothing but your time — or $49 for a complete evidence packet if you'd rather skip the research.

The only deadline that can't be undone is the one you miss. Check yours today.