2026 Property Tax Due Dates
Official SourceFirst installment (estimate)
July 1
Second installment (final)
December 1
Late Penalty
Interest accrues after due date
Payment Methods
Online, mail, in-person
Sullivan Treasurer
How to Pay Sullivan Property Taxes
💻
Online
Visit county treasurer website
📬
By Mail
Send check to county treasurer
🏢
In Person
Visit treasurer's office
Other Counties in New Hampshire
Related Resources
Get Deadline Reminders
We'll email you 2 weeks before your property taxes are due.