Section 511 - Extension of time for filing and payment(a) The Director may grant a reasonable extension of time for the payment of any tax or estimated tax imposed by this title or by Title 4, or any installment thereof, or for filing any return, declaration, statement or other document required, on such terms and conditions as the Director may require.(b) If any extension of time is granted for the payment of any amount of tax, the Director may require the taxpayer to furnish a bond, or other security, in an amount not exceeding twice the amount of the tax for which the extension of time for payment is granted, on such terms and conditions as the Director may require.(c) In the case of any return required under Chapter 15 of this title, if a federal extension of time for the filing of a return is granted for federal estate tax purposes, then the time for filing such return required under Chapter 15 of this title shall be automatically extended for a like period; provided, that a copy of the federal extension is furnished to the Director before or with the filing of such return.(d) This section shall not preclude or be administered so as to be in conflict with deferred payments under § 5316(b) of this title. 68 Del. Laws, c. 187, §1; 71 Del. Laws, c. 353, § 14; 71 Del. Laws, c. 385, § 4.;