About Aphthous Ulcer: These small sensitive painful craters in the mouth are common canker sores. There are many possible causes of apthous ulcers and frequently the cause is unknown. See also: sub-topics
The IRS phone number for individuals is (800) 829-1040. Businesses can call (800) 829-4933. Hearing impaired individuals can contact the IRS using TDD at (800) 829-4059. Operating hours are between 7 a.m. and 10 p.m. in your local time zone. After hours, a recording will direct you. Have all your paperwork in front of you when you call.
Call the IRS: 1-800-829-1040 hours 7 AM - 7 PM local time Monday-Friday. When calling the IRS do NOT choose the first option re: Refund, or it will send you to an automated phone line. So after first choosing your language, then do NOT choose Option 1 (refund info). Choose option 2 for personal income tax instead. Then press 1 for form, tax history, or payment.