Unpaid back taxes can be a serious issue for many taxpayers who don't have the means to pay them. The Internal Revenue Service (IRS) has recently turned over the collection of unpaid back taxes to a private collection agency. Taxpayers who lack the means to repay taxes may often negotiate a lesser settlement via an offer in compromise with the IRS either directly or through a tax attorney.
недоїмки по податках; заборгованість по сплаті податків
недоплата з податків; податкові недоплати