In larger firms, tax attorneys generally divide into one of two areas: transactional tax and tax controversy. Transactional tax attorneys counsel clients on tax issues that may arise in M&A and other transactions and advise on how to structure entities and transactions so as to lessen tax burdens. Tax controversy attorneys advise clients involved in audits and litigation involving tax issues. Tax attorneys often will earn an LL.M. in tax either immediately after law school or after a few years of practice. The work can often be deadline intensive, as tax lawyers are often called upon near the end of a transaction. Tax lawyers must keep up with complex and ever-changing laws and regulations at the federal and state levels that affect their work and generally do not have a tremendous amount of client interaction.