Professional Tax, Payroll, and Outsourced Accounting Solutions


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 three 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.


We’re always at your fingertip with this technology solution for the always-on, mobile world. Available in the iPhone and Android App Stores.

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.  

Interested in becoming a client?

Take a look at either our checklist for individuals or our checklist for businesses to see what information we may need from you. Then contact us today to schedule an appointment.

Brookfield, WI  

Phone: 414-751-6847

Fax: 866-486-4261


Sauk Prairie, WI  

Phone: 608-644-0206

Fax: 608-643-3467

Middleton, WI 

Phone: 608-824-3002

Fax: 866-486-4261