How do you deal with IRS?

You deal with the IRS just as you would any other people. Remember, the employees of the IRS are people just like you are. If you have not done anything wrong or fraudulent on your tax return, you have nothing to fear from the IRS. They have a job to do just like you do and it's not that easy of a job. You need to be knowledgeable about your tax return and any exemptions you may have taken. It would be advisable to take your tax accountant or person who prepared your return as well. It depends on what type of audit you are referring to as well. The vast majority is a letter questioning some item on your return. This can be handled by mail and you should get your tax preparer to assist you. If you are having a compliance audit you definitely need help. Hire someone to assist you with this for sure. A compliance audit is one where everything you have is being questioned and verified.