Bear in mind it's very important that you do it, because it is your client who will get into trouble if you don't. They must have a Form 8233 on file for foreign contractors they use, to prove to the IRS they don't have to do NRA withholding. If they don't have one on file, the IRS can assess penalties against them.
Your paperwork (tax return and 8833) is so that they can match them up, so if they audit your client, the money going out to you (on their ledgers) matches what is being declared on the return, so it enables them to audit your client effectively.
Also it's done to stop "tax treaty" shopping, e.g. if you were based in a country with a higher NRA rate than Canada they can see from year to year which treaty provision you're claiming on your 8233 and 8833.
The thing that always gets up my nose about it is that it doesn't appear to be at first glance to be that much paperwork, especially if you're self-employed as the 1040NR is only three pages long and it's quite easy to fill in. So you get to the end of that and look at the fiddly forms 8833 and 8233, but they are completely open-ended and you haven't got the faintest clue what to put on them unless you're an expert on the tax treaty.
So at this point you call up the IRS and spend all day on the phone waiting for an agent who knows the answer to the question.
IRS publication 597 helps a little bit, but it's out-of-date as the tax treaty has changed.



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