What is the phone number for the department of revenue? The customer support phone number of Massachusetts Department of Revenue is 800-392-6089/ 617-887-6367 (Click phone number to call).Who to call at dor? By phone. Tax Department: DOR's call center hours for tax help are 9 a.m. - 4 p.m., Monday through Friday. (617) 887-6367 or (800) 392-6089 (toll-free in Massachusetts) Child Support Services: Case-specific child support questions should be directed to (800) 332-2733 (local callers), (617) 660-1234) from 8:30 a.m. - 4:30 p.m., Monday through Friday.What are the tax brackets in oregon? Oregon's tax brackets are indexed for inflation, and are updated yearly to reflect changes in cost of living. Oregon has four marginal tax brackets, ranging from 5% (the lowest Oregon tax bracket) to 9.9% (the highest Oregon tax bracket).Where to send oregon tax return? You can contact Oregon State Tax Refund on the given phone number +1 503-378-4988. To know the address location of Oregon State Tax Refund it is also presented here Oregon Department of Revenue 955 Center St NE Salem, Oregon 97301-2555, United States. Contact them by sending email to Oregon State Tax Refund you will find an email address here .