Do I apply for the waiver or does the Canadian company hiring me?
Either can, and both have a stake. Regulation 105 reaches two parties: the non-resident service provider working in Canada, and the Canadian payer who would otherwise withhold on the gross fees. The provider is the one whose money is held back and who holds the cost and revenue information an application is built on. The payer is the one carrying the withholding obligation until a waiver says otherwise. In practice the provider prepares the application and the payer wants to see the outcome before it releases payment, so agree at contract stage who does what and by when.
Can I apply for a Regulation 105 waiver after I have been paid?
No. The waiver is applied for before the work is paid, and lead time is the binding constraint on the whole exercise. Once the payment has gone through with withholding deducted, the waiver route is closed for that payment, and the way to reach the right tax is a Canadian return for the year, claiming the amounts withheld against the tax actually due on the net income. That works, but it is slower, and it leaves your money with the CRA in the meantime. The planning point is simple. The application belongs in the project timetable, not in the invoicing.
Why is the withholding more than the tax I will actually owe?
Because it is applied to your gross fees rather than to what you earn from the engagement. Withholding on gross fees frequently exceeds the eventual tax by a wide margin, and the gap is widest exactly where you would expect: engagements with significant travel, subcontractors, equipment or local costs, where the fee is large and the margin is not. That mismatch is what the waiver exists to correct, either on the basis of a treaty or on the basis of the income and expenses of the engagement itself. Without one, the correction happens later, through a return.
I am covered by a treaty, so why do I need a waiver at all?
A treaty can decide what tax you finally pay. It does not switch off withholding at source by itself. Relief at the point of payment comes from a waiver, and a treaty-based waiver is one of the two routes available. The other is based on the income and expenses of the engagement. So the treaty is the argument, and the waiver application is how that argument is put before the money is paid. Skip the application and the treaty position still stands, but you will be making it on a return after the withholding has already happened.
What is the difference between a treaty-based and an expense-based waiver?
They ask different questions. A treaty-based waiver argues that under the relevant treaty the income should not be taxed in Canada, or should be taxed only to a limited extent, so withholding on the gross fee is not warranted. An income-and-expense waiver accepts that the income is taxable and argues about the amount: the withholding should reflect the expected tax on the net result of the engagement rather than a slice of the gross fee. Which one fits depends on your facts, and the evidence differs. Residence and treaty eligibility support one, a credible cost build-up supports the other.
My Canadian client insists it must withhold, is it right?
Usually yes, and it is protecting itself rather than being difficult. The payer carries the obligation to withhold on the gross fees it pays a non-resident for services performed in Canada, and that obligation sits with the payer until a waiver changes it. Asking the client simply not to withhold puts the exposure on them and gives them nothing to show for it. The productive conversation is about the timetable: what the waiver application needs, when it has to go in relative to the payment run, and what the client will accept as evidence that it has been dealt with.
How do I claim a tax treaty benefit?
Three things usually have to line up: proof you are resident of the treaty country, a declaration to whoever is paying you so they withhold at the treaty rate rather than the statutory one, and the claim itself on the return of the country giving relief. Do it before the payment where a reduced rate is available — claimed afterwards it becomes a refund exercise instead, which takes far longer. See certificates of residency.
What is Part XIII withholding tax in Canada?
Part XIII is the Canadian charge on certain amounts paid to non-residents — rent, dividends, interest, royalties, pensions and similar passive income. The payer withholds and remits it, and it is a flat charge on the gross payment rather than on profit, which is why a non-resident landlord can be withheld on far more than the net rental result. Treaties reduce the rate and elective returns recover the excess. See the section 216 return.
