What happens if you ignore an IRS audit? They Continue Without You
When you ignore an IRS audit, the IRS continues the audit process without you. It’s likely they will add additional tax, penalties and interest to the balance they come up with. Usually, how it works is they are taking data that was reported to them and using that without the appropriate write-offs to come up with a balance.
For example, if you trade stocks, they will come out with a balance based on the sales and not using any cost basis.
Another example would be if you are self-employed and got 1099. They will come up with a balance using the full 1099 amount as income, not counting any expenses.
This often results in a large balance.
If you continue to do nothing you most likely will end up losing your right to fight the case in US Tax Court. Then eventually, the IRS will proceed on collections.