You filed a Form 4868 and received a six-month extension on your taxes for 2018. Which of the following is true? Multiple choice question. The filing will postpone your payment liability until you file your Form 1040. The filing will postpone your payment liability, but you must pay your estimated payment liability by April 15, 2019. The filing will not postpone your payment liability, so you must pay your estimated payment liability by October 15, 2019. The filing will not postpone your payment liability, so you must pay your estimated payment liability by April 15, 2019.