An informal property tax assessment review is a no-cost meeting with your local assessor’s office where you present evidence that your property’s taxable value is too high and try to reach an agreement before filing a formal appeal. In most places it resolves the dispute on its own. To use it, you have to act fast after your assessment notice arrives, bring the right evidence, and keep the conversation on the facts the appraiser can actually change.
Start With the Deadline on Your Notice
The whole process is triggered by a document your local government mails you, usually called a Notice of Value, Notice of Assessment, or Notice of Proposed Property Taxes. It shows the assessor’s new valuation and starts the clock on your right to challenge it.
That clock is short. Most jurisdictions give you somewhere between 30 and 45 days from the date the notice was mailed. Miss it, and you have typically lost the right to challenge your assessment for the entire tax year. This is where most would-be appeals actually die, not on the merits but on the calendar.
Don’t count on an extension. Some states explicitly bar their appeal boards from granting extra time for any reason. A handful may accommodate extraordinary circumstances such as military deployment, but the safe assumption is that no exception exists. Treat the deadline printed on your notice as absolute, and start gathering evidence the day you open the envelope.
When notices go out varies enormously. Some jurisdictions mail them as early as January; others don’t send them until late summer or fall. If you’re not sure when to expect yours, call the county assessor’s office and ask.
Check the Property Record First
Before you spend a weekend pulling comparable sales, get a copy of your property record card from the assessor’s office. This is the document the assessor actually used to value your property, and it lists the physical description, land classification, and parcel identification number tied to your assessment.
Read every line. Wrong square footage, an extra bathroom that doesn’t exist, a finished basement that’s actually unfinished, an incorrect lot size, a bad condition code: these mistakes are more common than homeowners expect, and they are the easiest thing to fix because the proof is straightforward. If the assessor thinks your house is 2,400 square feet when it is actually 1,900, no comparable-sales analysis will matter as much as correcting that one number.
Pull Comparable Sales
If the physical description checks out and you’re challenging the valuation itself, comparable sales are your main tool. Look for three to five similar properties that sold within the past twelve months, ideally in the same neighborhood. “Similar” means close in size, age, condition, and lot size. The more your comps resemble your home, the harder they are for the assessor to dismiss. Document each sale with the address, sale date, sale price, and basic property characteristics.
You can also argue lack of uniformity: your property is valued higher than comparable homes in the same neighborhood. Even if the assessor’s number is close to market value, you can push back if nearly identical houses nearby are assessed for less.
Where to Find Them
Many county assessor websites publish recent sale prices alongside property details, which makes them a natural starting point. Your county recorder’s office holds deeds and transfer documents as public record. Online real estate platforms aggregate sales data and let you filter by location, size, and sale date. You can also ask a local real estate agent; most will pull recent comps at no charge, since it takes a few minutes and builds goodwill with a potential future client.
Proximity matters more than perfection. A house two streets over that sold last month is usually more persuasive than a closer match from a different school district. Avoid comps that involved unusual circumstances such as foreclosures, estate sales, or transfers between family members, because the assessor will likely exclude those as not reflecting true market conditions.
Other Evidence That Helps
Gather anything else that supports a lower value. Repair estimates for structural problems, photographs of damage or deferred maintenance, and documentation of negative external factors such as proximity to a noisy commercial property all strengthen your position. If you had a professional appraisal done recently for a mortgage or refinance, bring it. A licensed appraiser’s opinion of value carries real weight.
Watch the Assessment Ratio
One detail trips up many homeowners: not every jurisdiction taxes you on 100 percent of what your home is worth. Many apply an assessment ratio, meaning your taxable value might be set at, say, 80 or 90 percent of estimated market value. When you compare your assessment to recent sales, make sure you’re comparing apples to apples. If your county assesses at 85 percent of market value, a home that sold for $300,000 would have an expected assessed value around $255,000, not the full sale price.
How to File the Request
Most assessor’s offices provide a request form, either online or on paper, that asks for your parcel number, the current assessed value, the value you believe is correct, and a brief explanation of why. Use the exact figures from your assessment notice. In the explanation section, be specific: “Three comparable homes within half a mile sold for $15,000 to $25,000 less than my assessed value” is far more useful than “my taxes are too high.”
Many jurisdictions accept online submissions through a portal where you upload your evidence and receive an electronic confirmation. If you submit by mail, send it certified with a return receipt so you have proof of the postmark date. For in-person submissions, ask the clerk to stamp a copy with the date received. Keep every confirmation, receipt, and copy. If there is ever a dispute about whether you met the deadline, that paperwork is your shield.
Most informal reviews charge no filing fee. A small number of jurisdictions assess a nominal processing fee, but the vast majority treat this stage as a free service to taxpayers.
What Happens at the Meeting
After your request is processed, an appraiser will typically contact you to schedule a brief meeting by phone, video call, or in person. It usually runs 15 to 30 minutes, though complex cases can go longer. The appraiser may have already reviewed your evidence, or may be seeing it for the first time.
Stay organized and stick to facts. Walk the appraiser through your evidence in a logical order: any factual errors in the property record first, then your comparable sales, then any condition issues or negative influences. Bring enough copies so both of you can look at the same documents at the same time.
What doesn’t work: emotional arguments, complaints about tax rates, or broad grievances about government spending. The appraiser has no control over any of that. They are looking at one narrow question: does the evidence support a different value for your property? Keep the conversation there.
The appraiser may agree to a reduction on the spot, propose a compromise value, or explain why they believe the current assessment is accurate. If they offer a partial reduction, you decide whether it’s close enough to accept or whether you want to escalate. You are not obligated to accept the offer.
Keep Paying Your Taxes
Filing an appeal does not pause your tax obligation. In most jurisdictions you are expected to pay the full tax bill on time even while the review is pending. If the appeal results in a lower assessment, you receive a refund or credit for the overpayment. Failing to pay on time while waiting can trigger penalties and interest that wipe out any savings. Pay on time, dispute the value separately, and collect your refund later.
Your Assessment Could Go Up
In certain jurisdictions, filing an appeal opens the door for the assessor to review your entire property record, and if they discover the assessment was actually too low they can raise it. The risk is small but real. Before you file, compare your home honestly against recent sales. If your assessment is already at or below what similar homes are selling for, an appeal could backfire. The best candidates for an appeal are properties where the gap between assessed value and market evidence is clear and significant.
If the Informal Review Doesn’t Work
An unsuccessful informal review is not the end. Nearly every jurisdiction provides a formal appeal process, typically before a board of equalization or a similar review board. The informal decision usually triggers a new, short deadline to file that formal appeal, often 30 days or less from the date of the decision letter. Read the letter carefully for the next deadline.
Formal hearings are more structured. You present your evidence to a panel, the assessor’s office presents theirs, and the board issues a binding decision. Everything you prepared for the informal review carries forward, so the work isn’t wasted. Some states allow further appeal to a state tax tribunal or to court, but those stages involve real litigation costs and generally only make sense for high-value properties or large discrepancies.
When Professional Help Pays Off
Most homeowners can handle an informal review on their own, especially when the issue is a factual error or a straightforward overvaluation with clear comparable sales. The process is designed to be accessible without legal training.
Professional help starts to pay for itself when the property is unusual, the valuation is complex, or the dollar amount at stake is large. Private appraisers typically charge a few hundred dollars for a residential appraisal. Property tax consultants and attorneys often work on contingency, taking a percentage of the tax savings they achieve, usually between 25 and 50 percent of the first year’s reduction. You pay nothing if they don’t win, but you give up a significant share of the benefit if they do. For a modest reduction on a typical home, the math may not favor hiring someone. For a property assessed $50,000 or more above market value, the savings can easily justify the expense.
Consultants who handle hundreds of appeals a year maintain databases of comparable sales, know which arguments work with local appraisers, and know the procedural quirks that trip up first-timers. If your informal review was unsuccessful and you’re heading into a formal hearing, that’s often the point where professional representation becomes most valuable.