Yes — if the IRS assessed additional taxes after an audit and you have new information or documentation you didn't submit during the audit, you can request an Audit Reconsideration. This is different from a formal appeal — it's a way to ask the IRS to take a fresh look based on new evidence. You write a letter to the IRS explaining the error, include your supporting documentation, and send it to the address on your audit notice. Reconsideration is not a formal right but a discretionary process — the IRS may accept, partially accept, or decline your request. If the IRS declines and the tax is unresolved, you still have the option to appeal to the IRS Appeals Office or Tax Court.