Most trusts are subject to tax on their income at a flat rate equal to the highest marginal personal rate of tax. For example, if you set up a trust in Ontario during your lifetime and it earns and retains $100,000 of taxable income, it will be liable to pay about 53% tax on that amount.
Most trusts must also have a taxation year that is the calendar year (ending December 31).
One notable exception, where the high flat tax and the calendar year requirement do not apply, is a “graduated rate estate” (GRE). (An estate is treated as a trust for tax purposes.) A GRE is subject to tax at the same graduated tax rates that apply to individuals. A GRE can have any fiscal period as its taxation year, including an off-calendar year or the calendar year.
In general terms, a GRE is your estate that comes into existence upon and as a consequence of your death. Your estate can qualify as a GRE for up to 36 months after your death, generally if it does not receive contributions from other persons (the details regarding the “contributions” are quite technical).
Once the 36 months are up, the estate will be subject to the high flat tax. It will also have a deemed taxation year end immediately before the end of the 36 months, and after that point in time will be required to have a calendar year taxation year.
Because of the option regarding the taxation year, a GRE can have either three or four taxation years.