Section 553 - Period of collection after assessment; agreement for extension(a) Where the assessment of any amount of tax, interest, penalty, additional amount or addition to the tax imposed by this title or Title 4 has been made within the period of limitation properly applicable thereto, such amount may be collected by a proceeding in court under § 554 of this title, but only if such proceeding is begun: (1) Within 10 years after the assessment of such amount has become final; or(2) Prior to the expiration of any period for collection agreed upon in writing by the Director and the taxpayer before the expiration of such 10-year period.(b) The period so agreed upon may be extended by subsequent agreements in writing made before the expiration of the period previously agreed upon.(c) The provisions of subsection (a) of this section shall not affect collection by setoff against tax refunds due to the taxpayer, which setoff may occur whenever there exists an unpaid assessment of tax, interest, penalties, additional amounts or additions to the tax.(d) The provisions of subsection (a) of this section shall not shorten the period during which a judgment for any amount entered in a court may be collected by execution upon such judgment.(e) The running of the period of limitations on collections provided for in this section shall, in a case under Title 11 of the United States Code, be suspended for the period during which the Director is prohibited from collecting by reason of such case plus 6 months thereafter. 68 Del. Laws, c. 187, §1; 71 Del. Laws, c. 144, § 2.;