Overview

ATS addresses a wide range of county property-tax work, from assessments and levies to payment plans, accounting, and fee decisions. Its coverage of real and personal property, bankruptcies, foreclosures, and local improvement districts (LIDs) makes it more relevant to offices with varied cases than to teams seeking a narrow billing tool.

Kitsap County developed ATS, and the project remains in development there. Velosys offers deployment assistance, customization, training, and consultation for other counties. That support can help counties adapt the system, but prospective users should factor in the implementation work and confirm the project’s status and fit for their needs before committing.

Key features

Assessment and property records: ATS handles real and personal property, levies, new construction, destroyed property, bankruptcies, foreclosures, and LIDs. This range suits county offices with varied assessment and property situations.
Payment workflows: Payment plans and advance payment plans support staged collections. Counties can also control whether late fees and non-sufficient-funds (NSF) payments are assigned, leaving those decisions with local administrators.
Public personal-property updates: The Personal Property Online module gives business owners a public-facing website for updating personal property information. That provides a direct update channel for business records.
Accounting configuration: Counties can configure accounting and interface ATS with their existing accounting software. This is useful for offices that need tax workflows to connect with established accounting processes, though the precise integration fit will depend on the county’s setup.
Queries and API: Flexible queries support varied data retrieval, while a general-purpose RESTful API exposes ATS data. The user interface also accesses data through the API, an API-led design that may suit teams integrating the system with other software.
Database options: ATS works with Kitsap County’s MS SQL database without modifications. Other Entity Framework-supported databases can be used with a modification change, so counties using another database should confirm the required changes before planning deployment.

Pricing

The ATS plan is free and is open source. This makes it a fit for counties prioritizing access to the software without a license charge. Customization, deployment, training, and consultation are available as services from Velosys; counties should account for those implementation needs separately when evaluating total cost.

Platforms

ATS is listed as an API platform. Its RESTful API is central to how the interface accesses data, which makes it relevant to teams considering integration, but the API designation alone does not establish compatibility with a county’s other systems.

Who it's for

ATS is aimed at county property-tax offices, particularly those managing both assessment and treasurer workflows and able to arrange implementation support. It is less compelling for counties that require a mature, broadly established deployment or cannot accommodate database modifications and local customization.

Pros and cons

Pros: Broad coverage across assessment, property events, and collections gives county offices a single system for varied tax workflows.
Pros: Open-source software at no license cost, paired with a RESTful API, offers counties room to work with the application and its data.
Pros: Configurable accounting, fee controls, and flexible queries can accommodate local administrative practices.
Cons: The software remains in development by Kitsap County, which makes its wider adoption a less certain fit for counties seeking an established product.
Cons: Counties using a database other than Kitsap’s MS SQL setup may need a modification change, adding a compatibility consideration to deployment.
Cons: Deployment and customization services may be needed, and their costs can affect the economics beyond the zero-cost software plan.

Alternatives

For other options, see Property Tax Software.

PVDNet Suite is a paid API and web option to consider when a county is comparing paid alternatives to ATS.
Cozerna RPTA is a paid option with API, Linux, self-hosted, and web platforms; choose it when those deployment environments are a priority.
DEVNET Edge combines CAMA, assessment administration, billing and collection, permitting and zoning, records management, wEdge, and EdgeMaps under all-inclusive pricing. It may suit teams seeking that broader package.
itamlink is a paid API and web alternative for teams considering another platform with demo-based pricing.
Avalara VAT Registration is a paid API and web alternative for readers comparing tax-related services.
CSC Corptax is enterprise corporate tax software, making it a different option for corporate tax needs.
Catalis Assessment E-file is a paid web alternative for readers considering another assessment e-filing product.
Springbrook Property Tax Management covers residential, commercial, agricultural, and personal property taxes from assessment through billing and collection, and is an alternative for teams seeking that scope across web and mobile platforms.

Verdict

ATS is a strong candidate for counties that need broad property-tax workflows, value open-source software, and can plan for implementation with Velosys. Its zero-cost plan and API-led design are meaningful advantages, but counties should look elsewhere if they need a mature, established deployment or cannot accommodate the project’s development status and database requirements.

	ATS Assessor Treasurer Software	Catalis Assessment E-file
Free plan	Yes
Paid from	Free
Platforms	api	Web
Free plan	Yes
Tax calculation	Yes	Yes
Assessment tools	Yes	Yes
API access	Yes	Yes
Electronic filing		Yes
Jurisdiction tracking		Yes
Parcel data import		Yes
Audit reporting		Yes

ATS Assessor Treasurer Software vs Catalis Assessment E-file

ATS Assessor Treasurer Software

Catalis Assessment E-file