Keystone Business Services effortlessly handles bookkeeping and accounting needs for the Hamptons and North Fork region.


Our Menus of Accounting, Bookkeeping and Consulting Services have been designed to offer choices from which you can select only those services that address your specific needs at a cost that is affordable.

Bookkeeping Services

As the fastest growing Hamptons bookkeeping service, we have the experience to help you to grow your business. We can help you to set up a new business or clean up an existing one that has not had professional help. We set up reporting and systems needed to understand your company. Keystone can help with Sales Tax, Payroll Setup and Integration of your existing systems or help to streamline your systems with the correct checks and balances for best practices.

Hamptons Business Consulting

Keystone’s financial consulting services offers a managerial process that will keep your business growing and running at in peak performance year-round or for the season. Ask us about contractual agreements that we can arrange to help you eliminate waste and grow effortlessly.


Ask us how we can help you streamline your business and help you run it for peak performance!
Contact Information
Keystone Business Services
PO Box 448
East Hampton, NY 11937

Carol Matsuuchi

631 807 2858
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Keystone Brochure

"Keystone Business Service is a reliable bookkeeping and accountant service. It is a pleasure to work with Keystone."

Robert Moss, Owner
Accabonac Mountain Woodworking
Quickbooks Certified
Intuit Quickbooks Certified ProAdvisor