What is form 760c? It implies I underpaid my state taxes last year, but I certainly never received any notice to that effect.

[MeganS]

Purpose Of Form 760C

Virginia law requires that you pay your income tax in timely installments throughout the year by having income tax withheld or making payments of estimated tax. If you do not pay at least 90% of your tax in this manner, you may be charged an addition to tax. Use Form 760C to determine whether you met the minimum payment requirement and/or whether you are subject to an addition to tax charge.

You may also need to use this form to demonstrate that you have not made an underpayment, or that you have met an exception that voids the addition to tax, particularly if your income did not remain constant throughout the year. See the instructions for Line 5 for more information.

I hope this answered you question if any other question i can refer you to this link:  www.virginia.gov