Summary answer: Loudoun County's real estate tax rate for 2026 is $0.805 per $100 of assessed value — among the lowest in Northern Virginia, kept there largely thanks to data center tax revenue, which now generates 38-42% of the county's General Fund. On an $800,000 home (near Ashburn's typical price), that works out to roughly $6,440 per year, or about $537 per month.
I'm Johnny with JQ Real Estate. Here's exactly how this breaks down, and why it's genuinely lower than nearby counties.
How Loudoun's rate compares regionally
| Locality | 2026 Rate per $100 Assessed Value |
|---|---|
| Loudoun County (Ashburn) | $0.805 |
| Fairfax County | ~$1.1225 |
| Alexandria City | ~$1.135 |
Why Loudoun's rate is genuinely this low: data centers, and Ashburn is the source
Ashburn sits at the literal heart of "Data Center Alley" — the world's largest concentration of data centers, generating the tax revenue that's cut Loudoun's rate from $1.145 per $100 in 2016 to $0.805 today. Without this revenue, one analysis found the typical homeowner's bill would need to rise by roughly $5,800 per year.
How your bill is actually calculated
Loudoun County assesses property at 100% of fair market value, with payments due June 5 and December 5.
Why this matters for your monthly budget
- Your lender includes this in your monthly payment — rolled into escrow along with principal, interest, and insurance
- This is a genuine, ongoing advantage of buying in Ashburn specifically — you're living at the direct source of the revenue funding this tax break
Factor this into your real budget
Reach out and let's run your real numbers, taxes included.
For more Ashburn buyer and seller questions, visit our Ashburn real estate hub.