How can I file a injured spouse form online?

What year are you filing the injured spouse form for?
Did you already file your federal tax return for that year?

Yes, I received off set info after I filed

You didn't say what year you are asking about, so I'm going to assume it's 2016. You can prepare the injured spouse form (Form 8379) in TurboTax Online, but you will not be able to e-file it. When you file Form 8379 separately from your tax return you have to print it and file it by mail.

Here's how to prepare an injured spouse form (Form 8379) in TurboTax.

• Click the Federal Taxes tab.
• Click Other Tax Situations.
• Scroll down to the "Other Tax Forms" section near the bottom of the page, and click the Start, Update, or Revisit button for "Miscellaneous tax forms."
• On the next screen, click the Start, Update, or Revisit button for "Report an injured or innocent spouse claim."

Read the screens carefully. You want injured spouse relief, not innocent spouse relief. You will first get two screens for innocent spouse relief. Just click Continue without entering anything. Then you will get a series of screens for injured spouse relief.

One of the screens will ask you whether you want to file the injured spouse claim with your 2016 tax return. Select No. After you finish entering the injured spouse information there will be a button to print Form 8379 so that you can mail it.

Since you are filing Form 8379 by itself, note the following from the IRS instructions for Form 8379.

"If you file Form 8379 separately, please be sure to attach a copy of all Forms W-2 and W-2G for both spouses, and any Forms 1099 showing federal income tax withholding, to Form 8379. The processing of Form 8379 may be delayed if these forms are not attached, if the form is incomplete when filed, or if you attach a copy of your joint tax return."