Taxes owed must be paid by April 18th to avoid a penalty & interest. You can use the 1040-V voucher which is used to pay your taxes owed. You can pay any amount as long as the full amount is paid by April 18th. If it is not paid in full then a penalty and interest will be added until the full amount is paid.
The four vouchers (1040-ES) you are referring to sound like estimated tax payments, which are paid each quarter which goes towards your next year taxes. See the following FAQ:
Why did 1040-ES estimated tax vouchers print out? Do I need them?
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