Use the form 7004 to get an automatic 6 month extension for an 1120-POL.

See the instructions at https://www.irs.gov/instructions/i7004

The form is at https://www.irs.gov/pub/irs-pdf/f7004.pdf.

If you have TurboTax Business, you might find the form there, but you might as well print the IRS form, fill it in, and mail it tonight.

Don't forget to read the Instructions for F-7004 to obtain the correct mailing address for your jurisdiction.

Forms F-7004 have not been eligible by IRS for e-file as of yet and must be physically mailed.  Meanwhile you may be likely tardy for today's postmark deadline.  Good Luck!