The MSA states
"Beginning in April, 2006, and continuing annually thereafter for so long as the Husband has an obligation to provide Child Support; the parties shall exchange individual Federal Income tax returns reflecting income from all sources of employment for the preceding year. If there has been an increase or decrease over the previous year’s income figures they shall then recalculate the appropriate Child Support figure in accordance with the
Guidelines.
The Husband shall be entitled to declare the child as a dependent and use
the Head of Household designation for her on his Federal and State income tax returns and claim the accompanying deduction or tax credit for the all of the years of her minority. Each shall cooperate with the other by signing the necessary Department of Treasury form(s) to allow the taking of the exemption, including, without limitation, Department of Treasury Form 8332."

Today my X sent me this e-mail
"To benefit (child) with her possible grant/loan/school applications, I will not be claiming her on my 2009 or future tax returns. It is up to you whether or not you would like to claim her on your tax returns – you might want to investigate to see how it will affect her applications.
Also, I do not need a copy of your tax return now or in the future since nothing is changing from now until (child) is an adult."

Is he allowed to just make this decision without even asking me or the Court?