AppealHarbor Jurisdiction Fairfax County, VA Tax year 2026 Reviewed 2026-08-02

Is appealing worth it? The honest math

Last reviewed 2026-08-02, against the county's 2026 appeal forms and the current Virginia Code. The 2027 forms and dates have not been published yet.

Most pages about property tax appeals are written by people who want you to file one. This one is written to help you decide whether to bother.

The arithmetic is simple and the answer depends entirely on your own numbers. Here is how to work it out.

In 30 seconds:

  • What you save is the reduction in assessed value multiplied by the tax rate — not the reduction itself.
  • Part of your bill is a flat charge that does not fall no matter what happens to your assessment.
  • The rate is reset every year, so a reduction does not lock in a saving.
  • Three ways to do this: yourself for free, a flat-fee evidence packet, or a contingency firm that takes a share of what you save.
  • Each one honestly wins in different circumstances, and the deciding number is how much is actually at stake.
  • Filing reopens your assessment in both directions. That is a real cost, not a footnote.

Fairfax County only. The City of Fairfax and the City of Falls Church assess separately, run their own appeal processes, and set their own deadlines — including deadlines that differ from the county's. If your tax bill comes from one of those cities, this page does not apply to you.

What a reduction is actually worth

The number people fixate on is the assessment. The number that matters is the tax.

The formula is the reduction in assessed value, multiplied by the tax rate.

For tax year 2026, Fairfax County's base real estate rate is $1.12 per $100 of assessed value. So a $50,000 reduction in assessed value is worth about $560 a year at the base rate.

Most parcels also carry district levies on top of that base — stormwater at $0.0325 per $100, leaf collection at $0.019 in some districts, pest control at $0.001, and community center levies in McLean and Reston. Those are also charged per $100 of value, so they fall too. Your notice shows which apply to your parcel.

Work it with your own figures before you do anything else. A reduction you would be pleased to win, times your rate, is the entire prize.

What does not fall

Not every line on your bill moves with your assessment, and this is where the arithmetic disappoints people.

Some charges are flat. The refuse fee is $630 per dwelling unit, and the Springfield Water Service District charge is $959 per parcel. Those amounts do not change if your assessed value drops, because they are not calculated from it.

So if you are looking at a bill and thinking about what a ten percent reduction would do to it, subtract the flat charges first. The percentage applies to what is left.

The rate resets every year

A reduction is not an annuity.

The Board of Supervisors sets the real estate rate annually through the budget process. It has moved recently — $1.125 in 2024, $1.1225 in 2025, $1.12 in 2026. And your assessment is re-set every January regardless of what happened last year.

Winning a reduction this year does not fix your value going forward. It changes this year's bill, and it changes the starting point the county works from next year. Anyone telling you a single appeal locks in savings for a decade is selling something.

The three ways to do this

Do it yourself Flat-fee evidence packet Contingency firm
Cost Free Fixed, paid upfront — ours is $99 A share of first-year savings
Who files You You They do
Your effort All of it Reading, then filing Almost none
If you lose You are out your time You are out the fee You owe nothing
If you win big You keep everything You keep everything above the fee They keep their share

Contingency pricing, sourced. The largest national firm in this space, Ownwell, applies its fee to actual tax savings in the year it appeals, using 25% in its own published worked example. Its own guide to the industry says most firms charge 35% to 50% of first-year savings (Ownwell, May 2026).

One thing to know before you go looking: as of 2026 Ownwell's service area does not include Virginia. Virginia work is done by local firms and attorneys whose terms vary, so ask directly what the percentage is, whether it applies to first-year savings only, whether it renews automatically, and whether there is a minimum fee.

When each one honestly wins

Do it yourself wins when the amount at stake is small, or when the problem is a plain factual error you can document in an afternoon. If your record shows a bathroom you do not have, you do not need to buy anything to point that out.

A contingency firm wins when the amount at stake is large and you want no involvement at all. On a big reduction their percentage is a lot of money — but a percentage of nothing is nothing, and if you would otherwise not file, their fee is the price of an outcome you would not have had.

A flat fee wins in the middle: when there is enough at stake that you want good evidence, but not so much that giving away a quarter of it makes sense, and you are willing to file the paperwork yourself.

The crossover is arithmetic you can do. Take the saving you think is realistic, take the percentage a contingency firm quotes you, and compare that to a fixed fee. Below a certain saving the fixed fee is worse. Above it, the fixed fee is better. Where that line falls depends on numbers only you have.

We are not going to tell you which side of it you are on.

The effort ledger

Administrative review takes a form, up to five comparable properties, and whatever you write to explain the error. Expect the county to contact you — DTA staff verify a property's physical description when an appeal is initiated, which ordinarily means an inspection. You can decline, and the review proceeds on the information available.

The Board of Equalization (the independent county board that hears assessment appeals) takes more. All written and supplementary information must be submitted with the application by the filing deadline, formatted to their rules, and there is a formal hearing with sworn testimony.

Circuit Court is litigation. Get legal advice before considering it.

How the three routes compare sets out what each one expects.

The risk ledger

An appeal reopens your assessment, and the value can be affirmed, lowered, or raised.

That is not a scare tactic — it is what the statute provides and what the county's own forms say. If the county's record understates your house, an appeal is an invitation to correct it upward.

This is why reading your property record comes first. It is free, it is private, and it tells you which direction the facts point before anything is filed. How to check your property record for errors walks through it, and can your assessment go up if you appeal? covers how the reopening works at each route.

Why a "no case" answer costs nothing here

Our comparison is free, and it stays free when the answer is that the numbers do not support an appeal.

That is deliberate, and the reason is not generosity. A service paid per packet has an incentive to find a case in every property. A service that charges only when there is something worth filing has to be willing to say there is not — and saying so has to cost the customer nothing, or the incentive comes straight back.

So the free step tells you what recent Fairfax sales suggest about your assessment. If that points nowhere, you have lost nothing but the time it took to ask. How the comparison is built explains the method, including where it is uncertain.

We do not publish success rates — not ours, not the county's, not industry figures. We have not filed enough appeals to have a rate worth quoting, and the figures that circulate elsewhere count assessment changes in both directions. When we have honest numbers, we will publish them with their denominators.

Sources