If a problem arises after we file your return, you may have to call the IRS directly in order to resolve it. Individuals can reach the IRS at 1-800-829-1040. This will put you into their automated help system through which you can reach an agent. For identity theft victims there is a special number: 1-800-908-4490.
Alternately you may also have to reach your state’s tax authority if a problem arises with your state tax return. Their websites will have more information about contacting them.
You can find a list of all the state tax authority websites, their phone numbers, and more information about contacting the IRS.