ATS Assessor Treasurer Software

6.8easy start · #1 of 17
in Property Tax Software

Free to practise onyes
Free trialnot on record
Well documentedyes
Runs where you worknot on record

Runs on api.

ATS Assessor Treasurer Software is ranked #1 of 17 in property tax software on The Geeks Club. It runs on API. There is a free plan.

ATS Assessor Treasurer Software plans and pricing

All plans

ATS Free Open source; customization, deployment, training, and consultation are available services, with no service prices shown velosys.com · 5 Oct 2026

Compared on property tax software

Free plan: Yes
Tax calculation: Yes
Assessment tools: Yes
API access: Yes

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The record

Purpose: ATS is an open-source, customizable property tax solution for calculating and collecting property taxes.
Assessments and property: It manages assessments, levies, real and personal property, new construction and destroyed property, bankruptcies, foreclosures, and LIDs.
Payment plans: It supports payment plans and advance payment plans.
Public module: Its Personal Property Online module provides a public-facing website where business owners can update their personal property information.
Accounting: The software lets counties configure accounting and interface with their existing accounting software.
Fees and queries: Users can control whether to assign late fees and NSF payments, and can run flexible queries.
API: ATS has a general-purpose RESTful API, and its UI accesses data through that API.
Database: The page says ATS works with Kitsap County’s MS SQL database without modifications and that other Entity Framework-supported databases can be used with a modification change.
Implementation support: Velosys offers counties deployment assistance, customization, training, and consultation.
Intended users: The page presents ATS as a property tax management application developed by Kitsap County, Washington, and describes Velosys deployment assistance for other counties.
Development status: The page says ATS is in development by Kitsap County and that Kitsap is considering making the project open source and available to other counties.
Maker headquarters: Velosys is based in Poulsbo, Washington.
Open source: The page describes ATS as open source and freely available.
Fees and payments: Users can control whether late fees and NSF payments are assigned.
Price from: Free

Where it ranks on The Geeks Club

Best Property Tax Software in 2026#1 of 17

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Sources

velosys.com/ats/· checked 5 Oct 2026
velosys.com/company/· checked 5 Oct 2026