What is an NR4 slip and why did I get one?
It is the Canadian slip a payer issues when it pays certain amounts to someone who is not resident in Canada and withholds Canadian tax from them. You will usually receive one because you hold something in Canada that produces income, such as an account, a property, a pension entitlement or a loan to a Canadian borrower, or because a Canadian entity owes you money of a kind the withholding rules reach. The slip does two jobs: it tells you the gross amount and the tax taken, and it tells the tax authorities the same thing. Read the codes on it before reading the numbers, because the codes decide what the numbers mean.
Why does the income code on my slip matter so much?
Because the code is the character of the payment, and character decides everything after it. A treaty deals with interest in one article, dividends in another, royalties in a third and pensions in a fourth, each with its own rate and its own conditions. The code on the slip is what the payer decided the amount was, and it is the starting point both tax authorities work from. If the code is wrong, the rate applied is probably wrong too, and the credit you claim at home is being claimed against tax that Canada may not have been entitled to collect. Correcting the code is usually the first step, not the refund claim.
Do I issue a slip if a treaty reduced the tax to nothing?
Yes. The reporting obligation and the withholding obligation are separate: reducing the rate under a treaty, even to nothing, does not take the payment out of the reporting system. The slip is where you show the gross amount, the code you applied and the rate you used, and it is the only contemporaneous record that the reduced rate was applied deliberately and on evidence. Payers who withhold nothing and report nothing have no way, two years later, of showing why. Keep the recipient's declaration of residence and beneficial ownership on file with the slip, because the question when it comes will be about entitlement, not arithmetic.
I paid a non-resident contractor, does that go on a slip?
Probably not on this one. The slip belongs to the withholding system for passive-type amounts: interest, dividends, rents, royalties, pensions and similar. Fees for services physically performed in Canada by a non-resident are caught by a different rule, with its own withholding and its own reporting. Mixing the two is a common and expensive error, because it puts an amount on the wrong slip under the wrong code, and the recipient then cannot claim relief against it in their own country. Work out first what kind of payment it was and where the work was done. The paperwork follows from that, rather than the other way round.
My slip shows more tax than the treaty rate, can I recover it?
Often, but which route depends on how much time has passed. While the year is still open to the payer, the cleaner fix is for the payer to correct its own records and its slip, because the money is then reconciled where it was withheld. Once that is no longer practical, the recipient makes a refund claim to Canada, supported by evidence of residence, beneficial ownership and the character of the amount. In both cases the slip is the anchor document. Before starting either, check what your home-country return has already claimed as a credit, because recovering the tax from Canada changes that figure.
Can I use the slip to claim a foreign tax credit at home?
It is the evidence you will be asked for, but it is not the whole answer. A foreign authority giving credit for Canadian tax generally looks at two things the slip cannot settle on its own: whether the amount was of a character its own rules recognise, and whether Canada was entitled to the tax at the rate taken. Tax withheld above the treaty rate is recoverable from Canada, and tax that is recoverable is usually not creditable elsewhere. So an over-withheld slip claimed in full at home creates an exposure in the other country rather than fixing one. Settle the rate first, then claim.
What is Form 1042-S and what do I do with it?
The statement a US payer issues to a non-resident showing US-source income paid and tax withheld — the non-resident counterpart to a 1099. Use it two ways. In your own country it evidences the US tax paid for credit purposes. And where the rate withheld was higher than your treaty entitlement, or the income was not taxable at all, the way back to the money is a US non-resident return claiming the refund. Check the income and exemption codes before assuming the rate was right. See Form 1042-S.
How would a foreign tax authority know I am resident there?
Mostly from information you or your bank already provided. Account-opening forms ask you to self-certify tax residence, and that certification is reported between authorities under the Common Reporting Standard or, for US accounts, under the FATCA framework. Beyond that: employer and payroll filings, property registries, immigration records and the tax filings of anyone who paid you. The realistic planning assumption is that the data arrives. See FATCA and information reporting.
