Kollath CPA was launched in 2007 to provide tax and accounting services to individuals and small- to mid-sized companies. Since then, the company has grown to four distinct divisions: the flagship division which offers a full range of tax and accounting services; Organic Payroll, which provides customized payroll services; and SustainableHR, providing human resource support to small to mid-sized businesses.

The Mobile CPA App is designed to give critical, at-your-fingertips information whenever you need it. It’s packed with tools you will love – GPS mileage trackers, receipt and expense management, income tracker, key deadline dates and tax updates, and real-time news from our Mobile CPA team. This powerful free tool allows us to communicate directly with you in a modern, time-efficient, and effective way.


With App use booming, we feel that this App represents the perfect tool for us to interact with existing and future customers. Enjoy the Mobile CPA App with our compliments! This powerful new free Finance & Tax App has been developed by the team at Lawrence Grant to give you key financial and tax information, tools, features and news at your fingertips, 24/7.  

At Kollath CPA we adhere to the highest levels of professional ethics and promote honesty and transparency in every engagement. Client satisfaction is our top priority, and our focus is on helping individuals and businesses make the best tax and financial decisions. We work across all industries, and we are especially well-equipped to work with small- to mid-sized businesses, nonprofits, and in health care clinics.   ​

As a division of Kollath CPA, SustainableHR is a dedicated human resource outsource service team with over 30 years of industry experience serving Madison, Milwaukee, and the surrounding areas. SustainableHR was created to assist businesses that have 1 to 50 employees with building a strong foundation that nurtures sustainability and growth. ​

Kollath CPA's goal is not just to assist, but rather improve and simplify your organization's operations and responsibilities through our "SIMPLICITY" solutions.  Our accounting services include; bookkeeping, financial management, and strategic analysis using the latest and greatest technology.  ​

Organic Payroll provides payroll services to a growing number of businesses across the country.  Our processing is done in a secure online environment which allows you and your employees 24/7 access to your important data. We take the hassle out of staying on top of federal and state payroll tax regulations and eliminate costly penalties and the hassles of corresponding with taxing agencies.




Payroll.  Tax.  Accounting.  HR Consulting