For the purposes of this section and ORS 314.417 to 314.423:
(1) In the case of a return submitted to the Department of Revenue with payment of less than the amount of tax computed to be due, the difference between the tax computed to be owing by the taxpayer and the tax submitted with the return is considered as assessed on the due date of the original return (determined without regard to any extension of time granted for the filing of the return) or the date the return is filed, whichever is later.
(2) The term “time of assessment” means:
(a) In the case of an assessment made under ORS 305.265 and 314.410, 30 days after the date the notice of assessment is mailed to the taxpayer;
(b) In the case of an assessment made under ORS 314.440, five days after the date the notice of assessment is mailed to the taxpayer; or
(c) In the case of a tax assessed as described in subsection (1) of this section, the due date of the original return (determined without regard to any extension of time granted for the filing of the return) or the date the return is filed, whichever is later.
(3) Unless a warrant has been recorded in the County Clerk Lien Record in the county in which property is located, no warrant shall be considered as a lien with respect to that property.