Tax resolution is the process of working with the IRS and tax professionals to find a solution to your tax problems. The IRS might have an issue with your tax return or tax situation for a few reasons. If you have a complicated tax return, for example, the IRS might audit you to verify you are reporting the appropriate amount of income and claiming legitimate deductions. In some cases, the IRS might believe you have underreported your income, and it might want to take a closer look at your tax situation.