What does it mean when the IRS says you are sol?

When the IRS says you are "SOL," it refers to the "Statute of Limitations." This means that there is a time limit within which the IRS can assess additional taxes or initiate collection actions against you. Generally, the IRS has three years from the date you filed your return to audit it or pursue you for unpaid taxes. After this period, they cannot take legal action to collect the tax debt, assuming no fraudulent activity is involved.