Operators must file the mining tax return within six months after the end of their fiscal year.

The following documents must be enclosed with the return:

• the financial statements of the mine(s), or, failing that, the financial statements of the operator
• the auditor's report, if applicable
• a reconciliation report of the financial statements and of the return

As of the fiscal period ending in 2022, operators no longer need to provide detailed analyses justifying each amount claimed in their return.  

Where an operator is a corporation that files the return in a functional currency for a taxation year, the operator must also file a mining tax return in a functional currency for the fiscal year that corresponds to the taxation year.

Any operator that does not file a mining tax return by the deadline is liable to a penalty.

Associated operators

If the operator is associated with other operators, it must enclose form IM-30.EN-V, Agreement Between Associated Operators Regarding the Mining Tax, with its return. The agreement defines how the associated operators will allocate the limits related to the additional depreciation allowance and minimum mining tax threshold.

Amending a return

An operator that wants to amend a mining tax return that has already been filed must complete and file form IM-30.R-V, Request for an Adjustment to a Mining Tax Return. The form must be accompanied by an amended copy of the return (form IM-30-V or forms IM-30.MX-V and IM-30.DL-V) and all supporting documents.