Yes, the compensation paid to you by the Estate are considered taxable income. Please refer to the CRA "Legal representative": http://www.cra-arc.gc.ca/tx/ndvdls/lf-vnts/dth/rprsnttv-eng.html
To quote their page: "Unless included in your business income, trustee, executor, or liquidator fees paid to you for acting as an executor is income from an office or employment. As the executor, you must report these fees on a T4 slip. For more information see "Employment by a Trustee" in Chapter 1 of the T4001, Employers' Guide - Payroll Deductions and Remittances."