Uniform Title Convention on Mutual Administrative Assistance in Tax Matters (1988). Protocols, etc., 2010 May 27. Title Protocol amending the Convention on Mutual Administrative Assistance in Tax Matters : message from the President of the United States transmitting the Protocol amending the Convention on Mutual Administrative Assistance in Tax Matters, done at Paris on May 27, 2010 (the "proposed protocol"), which was signed by the United States on May 27, 2010.