There really is no “short” payment plan. The short plan just means pay as soon as you can. The penalties and interest over 4 months will almost always be less than the application fees for a longer formal plan. Indicate in TurboTax that you will “pay by mail”. Then mail a check for as much as you can by April 15, or make an electronic payment at www.irs.gov/payments. Then pay the balance as soon as you can. The IRS will bill you for the penalties and interest.
