Returns required by section 145.481 shall be filed within nine months after the death of the decedent. A person required to make and file a return under sections 145.011 to 145.995 shall without assessment, notice, or demand, pay any tax due thereon to the director of revenue on or before the date fixed for filing such return (determined without regard to any extension of time for filing the return). The director shall prescribe the place for filing any return, declaration, statement, or other document required pursuant to this chapter and for the payment of any tax.