taxes are due by 4/15/2016 - you can efile with or without a payment and print payment coupons to mail the remainder.
REMEMBER - a payment plan does not stop interest and penalties from accruing - it stops the IRS from levying bank accounts or paychecks to collect the money.
You can set up a payment plan to pay after this date - but it will start accumulating interest on 4/15/16 so pay as much as you can before that. Most programs have a section where you can ask for a payment plan. If not the IRS website offers such a service.
