Fairfax County’s 2026 Assessments: What Owners Should Check Before the Appeal Deadline
Daniel ParkNo. 124
Key takeaways
- Fairfax County’s 2026 assessments, released February 17, 2026, show the average residential value up 3.99% to $829,895.
- Single-family detached homes rose 4.28% on average, townhouses 3.9% and condos 2.94%. About 81% of homes went up, roughly 8% went down and about 11% were unchanged.
- The administrative appeal deadline is April 1, 2026 at 4:30 p.m., and the Board of Equalization deadline is June 1. No late appeals are accepted.
- The county executive’s proposed budget keeps the tax rate flat at $1.1225 per $100, which the county estimates would still raise the average homeowner’s bill by about $356.
- Seniors and people with disabilities who meet the 2026 limits ($90,000 income, $400,000 net worth) can apply for tax relief by May 1.
Fairfax County’s 2026 assessment notices show a moderate increase for most owners: the average residential assessment rose 3.99%, to $829,895, according to the county’s February 17 release. Before the April 1 administrative appeal deadline, every owner should check three things: that the facts about the home are right, that the value lines up with sales of similar homes around January 1, 2026, and whether they qualify for tax relief. Here’s how to do that, and when an appeal is worth filing.
What Fairfax County’s 2026 assessments show
Fairfax assesses every property annually at its estimated market value as of January 1. The figures below come from the county’s 2026 assessment announcement.
| Home type | Average 2026 assessment | Change from 2025 |
|---|---|---|
| Single-family detached | $1,012,504 | +4.28% |
| Townhouse or duplex | $612,580 | +3.90% |
| Condominium | $387,560 | +2.94% |
| All residential | $829,895 | +3.99% |
That’s a smaller jump than last year, when the county reported a 6.65% average residential increase. It also matches what we saw in sales during 2025: steady prices, more inventory and modest gains, which I covered in my Fairfax County 2025 market review.
Averages hide a lot. About 81.2% of residential properties increased, nearly 8% decreased and about 11% were unchanged. Your own number depends on your neighborhood, home type and recent sales nearby.
What it means for your tax bill
Your notice shows an estimated 2026 tax using last year’s rate, because the Board of Supervisors hasn’t adopted the 2026 rate yet. On the same day assessments were released, the county executive proposed a FY 2027 budget that keeps the real estate rate at $1.1225 per $100 of assessed value. Even with a flat rate, the county estimates the average homeowner would pay about $356 more because assessments rose.
- Public hearings: scheduled for April 14 to 16, when residents can weigh in on the rate and budget.
- Adoption: the Board plans to adopt the budget and rate in early May.
- Due dates: real estate taxes are due July 28 (first half) and December 5 (second half).
- Escrow: if your lender pays taxes from escrow, expect your monthly payment to be adjusted at the next escrow analysis.
Deadlines and how to appeal
| Step | Deadline | Where |
|---|---|---|
| Talk with an appraiser (optional, recommended) | Before you file | Department of Tax Administration, 703-222-8234 (TTY 711) |
| Administrative appeal | April 1, 2026, 4:30 p.m. | Department of Tax Administration (online, email, mail or drop-off) |
| Board of Equalization appeal | June 1, 2026, 4:30 p.m. | Board of Equalization, 703-324-4891 (TTY 711) |
| Tax relief application (seniors and people with disabilities) | May 1, 2026 | Department of Tax Administration |
The county accepts three grounds for appeal: the assessment exceeds fair market value, it lacks uniformity with similar properties, or there’s an error in the property description. A general rise in values is not, by itself, a reason to appeal. Late filings are not accepted.
How to check your assessment, step by step
- Look up your property record on the county’s real estate site and confirm living area, bedrooms, bathrooms, finished basement area, lot size and year built.
- Find three to five comparable sales of similar homes nearby that closed in the second half of 2025, close to the January 1, 2026 valuation date.
- Adjust for differences. A renovated kitchen, extra bathroom, garage or larger lot changes value. So do condition problems.
- Compare uniformity. Check what similar homes on your street are assessed at. A large, unexplained gap supports a uniformity argument.
- Gather documentation. Closing statements from a recent purchase, a recent appraisal, photos and contractor estimates for significant repairs.
- File only if the evidence points lower. The assessment can be confirmed or changed after review.
Buyers sometimes ask whether the assessment should guide an offer. It shouldn’t drive it; my post on offering the tax-assessed value explains why.
A worked example (illustrative)
This is a hypothetical townhouse, not a real property or client, to show the math.
| Item | Amount |
|---|---|
| 2025 assessment | $600,000 |
| 2026 assessment | $630,000 (+5.0%) |
| Average of four comparable fall 2025 sales | $612,000 |
| Requested value | $612,000 |
| Difference | $18,000 |
| Estimated tax effect at $1.1225 per $100 | About $202 per year |
In this example, the owner’s home rose faster than the 3.9% townhouse average, and nearby comparable sales support a lower figure. A $202 annual saving is worth an hour of paperwork, and a lower base carries forward. If those comparables had averaged $628,000, the case would be too thin to bother.
Common mistakes to avoid
- Missing the April 1 deadline. The county does not accept late administrative appeals.
- Arguing about the tax rate in an assessment appeal. Rate concerns belong at the April budget hearings.
- Using list prices or online estimates instead of closed sales.
- Ignoring data errors, such as a finished basement or extra bathroom that doesn’t exist.
- Forgetting relief programs. The 2026 notice estimate doesn’t reflect any relief you may qualify for.
- Assuming a decrease means a lower bill. If the rate rises, your bill could still change.
Daniel’s tip: Call the Department of Tax Administration before filing and ask which sales the appraiser relied on. If the comparables are a different style or much larger than your home, you’ll know exactly what to rebut. If they’re good matches, you’ve saved yourself the effort.
Want help finding the right comparable sales for your Fairfax appeal or checking your home’s current value? I’ll pull them for you.
This is general information, not legal or tax advice. For complex properties or larger disputes, consult a Virginia real estate attorney or tax professional. Neighbors in Arlington can compare with my Arlington 2026 assessments post, and you can explore more on my Fairfax County page.
Frequently asked questions
How much did Fairfax County assessments go up in 2026?
The average residential assessment rose 3.99% to $829,895. Single-family detached homes rose 4.28%, townhouses 3.9% and condos 2.94%.
What is the deadline to appeal a Fairfax County assessment in 2026?
Administrative appeals are due by 4:30 p.m. on April 1, 2026. Appeals to the Board of Equalization are due by 4:30 p.m. on June 1, 2026.
What is the Fairfax County real estate tax rate for 2026?
The Board of Supervisors sets it in early May. The county executive proposed keeping it at $1.1225 per $100, and public hearings are scheduled for April 14 to 16.
Who qualifies for Fairfax County real estate tax relief?
Homeowners who are 65 or older or have a permanent disability may qualify if they meet the 2026 limits of $90,000 in gross income and $400,000 in net worth. Applications are due May 1.
Can I appeal my assessment just because my taxes went up?
No. Valid grounds are that the assessment exceeds market value, isn’t uniform with similar properties, or contains an error in the property description.
Sources
Filed under Inside Fairfax County, Money & Mortgages
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