A consistent team for all your business needs

Kollath CPA is a professional services firm providing accounting, tax, payroll and human resource services to businesses, individuals and nonprofits. With offices in Brookfield, Madison and Prairie du Sac, Kollath CPA works one on one with clients throughout the region and the country.


Tax solutions for your financial needs — Tax Planning, Tax Preparation, Estates and Trusts

Outsourced Accounting

Outsource your bookkeeping, controller and CFO needs to our experienced accounting team.

Human Resources

Need short-term and long-term human resource support for your growing business? Look no further than SustainableHR.

Payroll Services

Paperless payroll that offers simplicity and peace of mind: Organic Payroll.

Industries We Serve

Startups & Small Business

Don’t sweat the small stuff for your startup or small business. We’ll do it for you.


Nonprofits have unique financial needs. Let us help.

Science & Technology

Fast-paced environment? We can keep up.


Leverage our expertise to navigate the complexities of the insurance world.