Boston Park Plaza
50 Park Plaza at Arlington Street
Boston, MA  02116

It is located in the heart of Boston and only three miles from Logan International Airport.

Registration Fees



The conference is scheduled to begin with registration on Tuesday, April 17th at 4:00 p.m. and will conclude at 12:30 p.m. on Friday, April 20th.

The goal of this program is to bring multistate tax professionals, who have various levels of experience in state and local income/franchise taxes, together in a group live environment that allows for extensive interaction and exchange of information as well as updates on key SALT issues and insights regarding state tax trends and opportunities. The program level is an overview and no advance preparation is needed.

This program is open to COST Industry Members Only.

Cancellation Policy

A $50 cancellation fee will be imposed for cancellations received on or before March 30th; cancellations after the 30th will not be refunded.  Member companies must be in good standing with COST at time of registration and time of program for employees to attend.  For more information regarding COST’s complaint and refund policies, please email Karen Galdámez.


Rooms have been reserved at a rate of $269 (plus taxes). Please make your hotel reservations directly with the Boston Park Plaza at 617.426.2000. Let them know that you are attending the Council On State Taxation, COST, Spring Audit Session/Income Tax Conference.

We encourage you to make your room reservations early as rooms in the COST block and hotel will sell out. Note: March 27, 2018 is the room reservation cut-off date. Rooms at the group rate may not be available if the COST room block sells out prior to March 28. 

Continuing Education

COST will assist you in applying for Continuing Education credit for the 2018 Income Tax Conference/Spring Audit Session.  COST is registered with the National Association of State Boards of Accountancy (NASBA) as a sponsor of continuing professional education on the National Registry of CPE Sponsors. State boards of accountancy have final authority on the acceptance of individual courses for CPE credit. Complaints regarding registered sponsors may be submitted to the National Registry of CPE Sponsors through its website: www.learningmarket.org.


April’s average high in Boston is in the high 50’s with lows in the high 40’s.

Dress for the conference is business casual.  We encourage you to bring a sweater or jacket to the meeting as the meeting rooms tend to be on the cooler side.

Photo Permission

By registering for COST’s conferences, workshops or schools, attendees hereby agree to allow COST to use any photos taken of them during the conference in news media, website, publications, articles, marketing pieces and etc.

For More Information

Please contact Karen Galdámez, COST, 122 C Street, NW, Suite 330, Washington, DC 20001, e-mail: KGaldamez@cost.org