Yes, you definitely can file your taxes now and pay later. You an choose at the end of the filing under the File section to Mail a check. This will allow you to continue your tax return,.
Mail the check or money order to the IRS, along with Form 1040-V, postmarked by the April 17, 2018 tax filing deadline to avoid the late payment penalty.
The address to mail your payment will be on your Form 1040-V, or you can get it off the IRS 1040-V instructions (page 2)
You can also make your payment online by visiting the following IRS.gov website visit www.irs.gov/Payments.
