What is the definition of "Doubt as to Collectability"?

Doubt as to Collectability occurs when the taxpayer is unable to pay the debt. The taxpayer must show both:

• The amount offered is the most that can be expected to be paid or collected from the taxpayer’s present assets and income; and

• The taxpayer does not have reasonable prospects for acquiring increased income or assets that would enable the taxpayer to pay a greater amount of the tax debt than the amount offered, within a reasonable period of time.