A tax attorney doesn't necessarily specialize in filing tax returns. Rather, you will want a tax attorney's services when you encounter a legal issue regarding your taxes.
If you are being audited, owe back taxes or face criminal tax charges, you definitely want to hire a tax attorney. As your counsel, an attorney can represent you before the IRS as well as in court.
In less-extreme situations, an attorney can help you create legal tax shelters or work through more complex tax concerns, such as corporate taxes.
Many tax attorneys specialize in certain tax areas, so be sure the one you choose is familiar with your particular needs.
Check with your local bar association chapter for information on tax attorneys in your area.