What is Client Portal?

Client Portal is a simple and easy to use web application that facilitates secure file transfer between Harrington Group and our clients. It conveniently streamlines your information and simplifies the communication process.


Client Portal will give you immediate access to your completed tax returns and related documents from anywhere you have internet access. For ease of use, these documents are organized in a customized file cabinet - similiar to how you store your documents at home.


How does it work?

Client Portal relies on the Microsoft Silverlight 4 platform and you may be prompted to install Silverlight from Microsoft’s website the first time you login. By utilizing up-to-date technology, we have ensured that your information is safe and accessible only to you. Click here for a video tutorial.


New Users

If you have already received an email from Harrington Group, please use the provided login ID and temporary password to access your Client Portal.


System Considerations

Client Portal will support all browsers on PC and Mac that are compatible with Microsoft
Silverlight 4.

Sign Up

New User Registration


Existing User Login

Quick Start Guide

Video Tutorial


234 E Colorado Blvd

Suite M150

Pasadena, CA 91101

Tel: 626.403.6801

Fax: 626.403.6866

A Trusted Nonprofit Partner

Experience. Service. Respect.


© 2017 Harrington Group, LLP



50 Francisco St

Suite 160

San Francisco, CA 94133

Tel:  415.391.3131

Fax: 415.391.3233