When should you hire taxation lawyers? Tax attorneys can assist individuals and businesses in a number of situations. Start-up businesses should talk to a tax lawyer to understand the tax implication of various business structures. Companies should also seek legal counsel on issues related to payroll taxes, sales taxes, use taxes and international tax issues. Individuals and couples can benefit from a tax lawyer's advice when engaged in estate planning, if you may have committed tax fraud, or if you're facing an Internal Revenue Service (IRS) or state tax audit.