Fairfax County Real Estate Tax 2026: Second Half Due Mon., Dec. 7

Fairfax County’s second-installment real estate tax is due Monday, Dec. 7, 2026, because Dec. 5 falls on a Saturday, according to the county’s Department of Tax Administration (DTA). The DTA’s “Tax Facts and Deadlines” page says: “Because December 5 falls on a Saturday in 2026, the due date is extended to Monday, December 7, 2026.” Its general rule is that a date falling on a Saturday, Sunday or county holiday moves to the following business day. The county’s real estate page still describes the installments as due July 28 and December 5, so the Saturday shift is easy to miss.

Other Northern Virginia jurisdictions do not all say the same thing, which is why the table below lists each one. The printable Northern Virginia due-date sheet puts them on one page with tick boxes. Mark the day on the December 2026 printable calendar.

Northern Virginia second-half real estate tax due dates, December 2026

Jurisdiction	Second-half date on its page	Weekday in 2026	What the page says about weekends
Fairfax County	Mon., Dec. 7	Monday	Saturday, Sunday or county holiday moves to the next business day
Prince William County (PWC)	Dec. 7	Monday	Calendar lists “Second-half Real Estate Taxes Due” on Dec. 7
Falls Church	Mon., Dec. 7	Monday	“Normally due on December 5 or next weekday if December 5 falls on a weekend”
Loudoun County	Dec. 5	Saturday	Page is silent on Dec. 5; confirm with the Treasurer
City of Alexandria	Nov. 15	Sunday	Next business day if a weekend, which makes Mon., Nov. 16 (computed from the city’s rule)
Arlington County	Second half was due Oct. 5	Monday	Already passed (installments are June 15 and Oct. 5)

Falls Church’s page lists Mon., Dec. 7, 2026 as the “First Half Payment Due for FY2027”, because the city counts its fiscal year (FY) from July. A second list on the same page still shows Saturday, Dec. 5 for “Half of Real Estate Tax Due”.

Loudoun’s tax calendar lists “December 5: Second Half Real Estate Taxes Due” with no year and no weekend rule for that date, so this story does not move it to Dec. 7. The same page does carry a weekend note for another date, October 5 on a Sunday, but not for Dec. 5. Owners there should check with the Treasurer’s office before relying on Monday.

What happens if the Fairfax County payment is late?

The DTA’s missed-due-date page says the penalty for late payment of real estate taxes is 10% of the amount due and is applied automatically after the due date. Real estate is paid in two installments, so a penalty applies to each late installment. The page adds that interest at 1% per year applies. Virginia Code § 58.1-3916 caps a local penalty at 10 percent of the tax past due, and says no penalty or interest is imposed when a taxpayer shows timely mailing with a Postal Service Certificate of Mailing or other proof of mailing.

The example below uses a made-up $4,000 second-half bill. It is computed from the rates on each source page; your bill shows your own amounts, and interest is not added here.

Jurisdiction, $4,000 second-half bill	Penalty rate on the page	Penalty on $4,000
Fairfax County	10% of the amount due	$400
Prince William County	10% late payment penalty	$400
City of Alexandria, up to 15 days late	5%	$200
City of Alexandria, more than 15 days late	10% or $10, whichever is greater	$400

Prince William County’s June 22, 2026 notice adds interest at 10% per year, accumulating monthly. Alexandria’s page lists 10% interest for the first year.

How much is one Fairfax County installment at $1.12 per $100?

On May 5, 2026, the Board of Supervisors adopted the FY 2027 budget and “lowered the Real Estate Tax rate by one-quarter cent, from $1.1225 to $1.12 per $100 of assessed value,” according to the county’s news release. The new rate took effect July 1.

Example assessment	Tax a year at $1.12 per $100	Each installment
$500,000	$5,600	$2,800
$700,000	$7,840	$3,920
$900,000	$10,080	$5,040

These figures are computed from the base rate alone and split the year evenly; the county’s bill is the one that counts.

How can I pay the Fairfax County bill?

The county’s Pay Taxes & Fees page lists online, mail, in-person and phone payments. The walk-in office is at 12000 Government Center Parkway, Suite 223, Fairfax, VA 22035, open “weekdays from 8AM to 4:30PM” per the page. The page says service fees may apply to some payment types. The DTA phone number is 703-222-8234.

Fairfax County’s senior and disability tax relief had a May 1, 2026 deadline for returning applicants, which has passed; no 2027 date is posted in the pages used here. For other deadlines that move off a weekend, see how weekend deadlines move, and for another county’s December due date, see LA County property tax dates.