Call the IRS: 1-800-829-1040
Visit the IRS website: https://www.irs.gov
Use the IRS online account: https://www.irs.gov/account
Check IRS contact options by topic: https://www.irs.gov/help/contact-your-local-irs-office
Find a local IRS office: https://www.irs.gov/help/contact-your-local-irs-office
Mail a letter to the IRS using the address on your notice or form instructions
Use the IRS Taxpayer Assistance Center locator: https://www.irs.gov/help/contact-your-local-irs-office
Contact the Taxpayer Advocate Service: 1-877-777-4778
Call the IRS business line: 1-800-829-4933
Call the IRS refund hotline: 1-800-829-1954