The quickest method is Fax. TAS has at least one office in every state, the District of Columbia, and Puerto Rico. Submit this request to the TAS office in your state or city. You can find the fax number in the government listings in your local telephone directory, on our website at dev.taxpayeradvocate.irs.gov, or in Publication 1546, Taxpayer Advocate Service – Your Voice at the IRS.