As part of the Fairfax County annual assessment program, the Department of Tax Administration (DTA) reviews the assessed values for all real property each year, with January 1 as the effective date of the assessments. The Constitution of Virginia, Article X, Section 2 and the Code of Virginia, § 58.1-3201 require real estate assessments to represent fair market value.

For most residential properties, fair market value is best determined from comparable sales data. This process involves analyzing recently sold properties. Appraisers use computer assisted mass appraisal techniques to accomplish this annual task. In addition to the Sales Comparison Approach, other approaches to value are considered as well, such as the Cost Approach and the Income Approach. 

For most commercial properties, fair market value is best determined by capitalizing the property's income into an estimate of value. This approach is commonly referred to as the Income Approach. This approach considers the ability of the property to earn rental income while taking into account the operating expenses and allowing for vacancy and collection loss. The resulting net operating income is then capitalized into value with an appropriate rate to achieve a fair market value estimate. This value is then compared to available market sales to determine if the property's assessment should change. Other approaches to value such as the Cost Approach and the Sales Comparison Approach are also considered.  Commercial Income and Expense Survey Forms and Instructions are available on the Forms page.

Additional information about assessment trends can be found in the current county budget on the Department of Management and Budget website, the assessment notice press release, or the real estate assessments comparisons page.

Calculating Tax Amount

The amount of taxes is calculated by dividing the assessed value by 100 and then multiplying by the tax rate:

For Example:

Additional tax rates may apply to your property.

Real Estate Assessment Notices

Property owners are provided with an annual official notice of the assessed value of their real property for local tax purposes. (Code of Virginia, § 58.1-3330) This notice is not a tax bill. The assessed value provides the basis for the real estate taxes that will be due on July 28 and December 5.

Property owners are encouraged to review their assessment notices as soon as possible.

What are my options if I need more information or I disagree with my assessment?

We encourage you to connect with our staff appraisers virtually to discuss your assessment questions. Make an appointment, send an email, or call our staff appraisers at 703-222-8234 weekdays from 8AM to 4:30PM. You may also review real estate information from DTA online at https://icare.fairfaxcounty.gov/ffxcare/

You may use the online information to:

• Determine if your property is described correctly on DTA records. Please note, properties, especially commercial properties, cannot be fully described on the website; you may need to call DTA for more details.
• Check the comparability of assessments in your general area for properties that have physical features similar to your own home.
• View a list of sales in your assessment neighborhood and consider if your property could have sold for its assessed value as of January 1st.

Visit our Real Estate Appeal page for more information about filing an assessment appeal.

Administrative appeal applications must be postmarked by April 1, 2026, filed online, or emailed to DTAREDappeals@fairfaxcounty.gov by 4:30 p.m. (EDT) on April 1, 2026. Administrative appeals will not be accepted after this date. An administrative appeal to DTA is not a prerequisite to filing an appeal to the Board of Equalization (BOE). Should you choose to file an administrative appeal, please do so as soon as possible as this will increase the likelihood of you receiving the appeal results prior to the BOE filing deadline of June 1, 2026, at 4:30 p.m. (EDT).

You may also appeal to the BOE. The statutory deadline for filing an appeal with the BOE is June 1. However, if the statutory deadline falls on a holiday or weekend, the deadline is the next business day. For 2026, the deadline is June 1st. BOE appeals emailed/uploaded must be received by 4:30 p.m. (EDT) June 1, 2026. Property owners are encouraged to file an appeal with DTA prior to filing one with the BOE.

Contact the BOE at 703-324-4891 [TTY 711], or at Suite 331, 12000 Government Center Pkwy, Fairfax, VA 22035.