That's a truly unfortunate situation.
However, with respect to filing your income tax return for this tax year, you are correct in that you should still continue to file your return in the normal manner (just as you would if your wages were not being garnished by the IRS). The only real difference, from your perspective, is that you shouldn't expect to see some (or any) of the tax refund that this indicated on your return . . . because the IRS will likely intercept or recover that before it reaches you, owing to your circumstances.
But, you still do need to prepare and file your tax return (as not doing so could cause additional problems with the IRS, and may also be illegal if you have enough income that you are otherwise required, by law, to file). And when doing so, there's nothing particular that you need to complete, or extra form to fill out with your tax preparation, other than to adjust expectations of a tax refund. This same advice will be the same for your state income tax return (if any).
The above may change if you are married, and filing your tax return jointly. In that instance, you may want to include an Injured Spouse form with your joint tax return.
A link to more information about this provided below:
https://ttlc.intuit.com/questions/1910698-how-do-i-file-form-8379-injured-spouse-allocation
Thank you for asking this important question.
