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ATS Assessor Treasurer Software

What ATS Assessor Treasurer Software is
ATS Assessor Treasurer Software is a property tax application for calculating and collecting taxes. Developed by Kitsap County, Washington, it manages assessments and levies for real and personal property, including new construction, destroyed property, bankruptcies, foreclosures, and LIDs. Counties can set up regular payment plans and advance payment plans, configure accounting, and connect the system with their existing accounting software. They can also choose whether to assign late fees and NSF payments, then use flexible queries to work with tax data. The Personal Property Online module provides a public-facing website where business owners can update their personal property information. ATS has a general-purpose RESTful API, and its user interface accesses data through that API. It works with Kitsap County’s MS SQL database without modifications; using other Entity Framework-supported databases requires a modification change. ATS is described as open source and freely available, while Velosys offers counties deployment assistance, customization, training, and consultation. ATS remains in development by Kitsap County, which is considering making the project available to other counties. The listed plan is free.
Who it suits
ATS is intended for counties managing property tax assessments, levies, payments, and accounting. Its public property information module may suit counties that want business owners to update personal property details online.
What it does well
- Manages real and personal property assessments and levies.
- Supports payment plans and advance payment plans.
- Business owners can update details through a public module.
- RESTful API serves both general access and the user interface.
- Described as open source and freely available.
What to know first
- Other Entity Framework-supported databases require a modification change.
- County deployment and customization services have no shown prices.
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| ATS | Open source; customization, deployment, training, and consultation are available services, with no service prices shown | Free |
As velosys.com lists them, read 5 Oct 2026. The maker's own page has the final word.
Getting started
- Visit the ATS website.
- Review the free ATS plan.
- Contact Velosys about deployment assistance, customization, training, or consultation.
Overview
ATS Assessor Treasurer Software is an open-source application for county property-tax assessment and collection. It is best suited to county offices prepared to configure and deploy a system around local processes. Its breadth and free software plan are compelling, but database changes and implementation work can affect the real cost of adoption.
Key features
- Assessment and property records: ATS covers real and personal property, levies, new construction, destroyed property, bankruptcies, foreclosures, and LIDs. That breadth suits offices handling varied property and case types, not just routine assessments.
- Payment and collection controls: Payment plans and advance payment plans support staged payments. Counties can control whether late fees and NSF payments are assigned, useful where local collection practices need to govern those decisions.
- Public personal-property updates: Its Personal Property Online module gives business owners a public-facing way to update their personal property information. That can make record updates more direct for businesses.
- Accounting and queries: Counties can configure accounting and interface ATS with existing accounting software. Flexible queries add a way to work with the system’s data without limiting use to preset views.
- API and database flexibility: ATS has a general-purpose RESTful API, and its user interface accesses data through it. The system works with Kitsap County’s MS SQL database without modifications; other Entity Framework-supported databases can be used with a modification change. Counties on another supported database should account for that modification in planning.
- Deployment assistance: Velosys offers counties deployment assistance, customization, training, and consultation.
Pricing
The ATS plan is free and is described as open source. It includes the software, with tax calculation, assessment tools, and API access. This makes it a strong option for counties seeking to avoid a software-plan charge while retaining a broad property-tax feature set.
Customization, deployment, training, and consultation are available as services, with no service prices shown. The free plan therefore does not establish the total cost of putting ATS into operation: counties should weigh any needed database modification and implementation support before choosing it.
Platforms
ATS is listed on the API platform. Its RESTful API is also the route through which its user interface accesses data, making the API central to the system’s design.
Who it's for
ATS is aimed at county assessment and treasurer workflows, and Kitsap County, Washington, developed it. It is most relevant to county offices that need assessment, collection, payment, accounting, and public personal-property update capabilities and can plan for deployment and customization. Its development by Kitsap County and stated status as in development make it a less certain fit for counties seeking a broadly established product.
Pros and cons
Pros
- No software-plan charge: The ATS plan is free and open source, which is attractive to counties with limited software budgets.
- Wide county workflow coverage: Assessment, payment plans, fee controls, accounting configuration, and public updates for business personal-property information cover several connected tasks.
- API-led access: A general-purpose RESTful API is part of the system’s design, not just an add-on access point.
Cons
- Implementation may require work: Other Entity Framework-supported databases require a modification change, and counties may need customization or deployment services.
- Development status calls for caution: ATS is in development by Kitsap County, which makes it less certain for offices seeking a broadly established deployment.
Alternatives
For a broader comparison, see Property Tax Software.
- CAMAai is a paid option with a pilot program described as having limited county availability and early access; consider it if that pilot availability suits your county.
- Springbrook Property Tax Management is a paid option covering residential, commercial, agricultural, and personal property taxes from assessment through billing and collection; consider it if that stated workflow scope fits.
- Vision CAMA is a paid option with a Vision 8 CAMA plan and demo-based pricing; consider it if a demo-request route suits your evaluation.
- Catalis Assessment E-file is a paid assessment e-file option; consider it if that is the need you want to address.
- CSC Corptax is enterprise corporate tax software with demo-request pricing; consider it if your requirement is enterprise corporate tax software rather than county property-tax administration.
- DEVNET Edge offers all-inclusive pricing and lists CAMA, assessment administration, billing and collection, permitting and zoning, records management, wEdge, and EdgeMaps; consider it if that broader set of functions fits your county.
- Ingenuity CAMA is a paid web-based option.
- itamlink is a paid API and web option with Professional and Enterprise plans; consider it if those platform options fit your requirements.
Verdict
Choose ATS if your county wants a broad, open-source property-tax system with assessment, collections, accounting configuration, public personal-property updates, and a RESTful API—and can plan for deployment and any database modification. Its free software plan is the clearest reason to consider it. Look elsewhere if development status or the prospect of implementation work makes a less uncertain adoption a higher priority.
Verdict
ATS may suit counties seeking a customizable property tax system with assessment, payment, accounting, and public update capabilities. Its free plan and RESTful API are central reasons to consider it; counties using another supported database should account for the required modification change.
Questions
How much does ATS cost?
The ATS plan is listed as free. Velosys offers implementation services, but their prices are not shown.
Is ATS open source?
ATS is described as open source and freely available. Kitsap County is considering making the project available to other counties.
What can ATS manage?
It manages property assessments and levies, payment plans, accounting configuration, late fees, NSF payments, and flexible queries.
Does ATS provide an API?
Yes. ATS has a general-purpose RESTful API, and its user interface accesses data through that API.
Which databases can ATS use?
It works with Kitsap County’s MS SQL database without modifications. Other Entity Framework-supported databases can be used with a modification change.
Who developed ATS?
ATS is presented as developed by Kitsap County, Washington. Velosys offers counties deployment assistance and related services.
Facts from ATS Assessor Treasurer Software's own pages
- Accounting
- The software lets counties configure accounting and interface with their existing accounting software. · velosys.com, 5 Oct 2026
- API
- ATS has a general-purpose RESTful API, and its UI accesses data through that API. · velosys.com, 5 Oct 2026
- Assessments and property
- It manages assessments, levies, real and personal property, new construction and destroyed property, bankruptcies, foreclosures, and LIDs. · velosys.com, 5 Oct 2026
- 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. · velosys.com, 5 Oct 2026
- 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. · velosys.com, 5 Oct 2026
- Fees and payments
- Users can control whether late fees and NSF payments are assigned. · velosys.com, 5 Oct 2026
- Fees and queries
- Users can control whether to assign late fees and NSF payments, and can run flexible queries. · velosys.com, 5 Oct 2026
- Founded
- 2011 · velosys.com, 28 Sept 2026
- Headquarters
- Poulsbo, Washington, United States · velosys.com, 28 Sept 2026
- Implementation and support
- Velosys offers counties assistance with deployment, customization, training, and consultation. · velosys.com, 5 Oct 2026
- Implementation support
- Velosys offers counties deployment assistance, customization, training, and consultation. · velosys.com, 5 Oct 2026
- 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. · velosys.com, 5 Oct 2026
- Maker background
- Velosys says it was founded in 2011 and is based in Poulsbo, Washington. · velosys.com, 5 Oct 2026
- Maker headquarters
- Velosys is based in Poulsbo, Washington. · velosys.com, 5 Oct 2026
- Open source
- The page describes ATS as open source and freely available. · velosys.com, 5 Oct 2026
- Payment plans
- It supports payment plans and advance payment plans. · velosys.com, 5 Oct 2026
- Public module
- Its Personal Property Online module provides a public-facing website where business owners can update their personal property information. · velosys.com, 5 Oct 2026
- Purpose
- ATS is an open-source, customizable property tax solution for calculating and collecting property taxes. · velosys.com, 5 Oct 2026
- Queries
- ATS supports flexible queries. · velosys.com, 5 Oct 2026
Where ATS Assessor Treasurer Software stands on Freedom251
- Property Tax Software#1 of 18
