Should I E-file if I owe Federal taxes and need a installation monthly payment plan?

Yes. If you are unable to pay your total balance due by April 15, 2019, you should go ahead and file your return on time and set up a payment plan with the IRS.  You can do this through TurboTax or directly online with the IRS. By filing on time, you will avoid a late filing penalty.  By setting up a payment plan with the IRS, you will avoid accruing additional interest and penalties. 

Here are some links to help you through the process:       

• How do I set up a payment plan in TurboTax?

• https://www.irs.gov/payments/payment-plans-installment-agreements