No such liability will be compromised if the liability has been established by a valid judgment or is certain, and there is no doubt as to the ability of the Government to collect the amounts owing with respect to such liability.
However, no such opinion shall be required with respect to the offer in compromise of any civil case in which the unpaid amount of tax assessed (including any interest, additional amount, addition to the tax, or assessable penalty is less than $50,000. However, such compromise shall be subject to continuing quality review by the Secretary.
27 C.F.R. §70.482
26 U.S.C. 7122
Approved by the Office of Management and Budget under control number 1512-0472