What is a tax residency certificate and why does India need one?
It is a document from the tax authority of the country you say you are resident in, confirming that it treats you as resident there. India asks for it before granting treaty relief, because relief under a treaty depends on being resident in the other state and India will not take that on assertion. Three things about it cause most of the trouble. It has to cover the period the income relates to, it has to be in the name of the person who receives the income, and it is evidence of what the other country says rather than a ruling by India on the point.
Which country issues my tax residency certificate?
The one whose residence you are relying on for the treaty claim, not the one taxing the income. If you are claiming relief in India as a resident of Canada, the certificate comes from the Canadian authority, issued there as a certificate of residency, and India is its reader rather than its author. Each authority has its own process and its own format, and the format is why a second document is often needed to complete the particulars. Apply in good time: the issuing authority works to its own timetable, and a treaty claim with a certificate still in progress is a claim you cannot yet evidence.
My certificate covers a different period from the income, does that matter?
Yes, and it is the single most common defect. A treaty claim is made for a period, and the certificate has to say that the other country treated you as resident during that period. A certificate for the preceding year, or one with no period at all, leaves the claim unevidenced even where the underlying facts are beyond argument. Where a period is wrong or missing, ask the issuing authority to reissue rather than explaining the gap, and where income arises across a boundary between periods, obtain certificates for both. Keep them with the computation they support, because that is where the question will be asked.
Can I claim treaty relief while I wait for the certificate?
A payer will not normally apply a treaty rate on a promise, because it is the party answerable for the deduction. So the realistic options are to delay the transaction until the documentation is in hand, or to accept the domestic deduction and recover the difference by filing an Indian return for the year on the treaty basis. Which one is right depends on how much is being held back and how long the certificate will take. What is not an option is applying the rate and hoping the certificate arrives, because the deduction has already been made or not made by the time anyone looks.
Does my certificate work if the contract is with a branch?
Only if the certificate names the person India is treating as the recipient. A certificate describing the parent while the income belongs to a branch, or naming a trading style rather than the legal person, describes somebody else as far as the claim is concerned. Work backwards from the contract and the invoice: identify who is entitled to the income, then make sure the certificate and any supporting declaration name that person. Where a group routinely contracts through different entities, it is worth settling in advance which entity signs Indian contracts, because retrofitting documentation to a contract already performed is slower than deciding it up front.
Does a residency certificate decide where I am resident?
No. It records one country's view. If both countries certify you as resident, which happens more often than people expect because each applies its own test, you have dual residence, and the treaty's tie-breaker decides which state treats you as resident for the treaty's purposes. That analysis turns on facts such as where your permanent home is and where your personal and economic relations are centred, and it produces one answer that both returns then have to be consistent with. The certificate is an input to that question, not the answer to it, and a file that treats it as the answer usually has an inconsistent pair of returns behind it.
Can exit tax exposure be reduced before expatriating?
The levers are timing and facts, not a filing position. The certification test rewards having five clean years behind you, which takes planning rather than paperwork. Where assets are held, when gains are realised, and how deferred compensation and retirement interests are structured all change the outcome, and the effect of gifts before departure has to be weighed against the separate regime for gifts and bequests from covered expatriates. This is planning that needs a runway of years. See departure planning timelines.
Can I avoid capital gains tax on a foreign property?
Not by virtue of it being foreign — there is no exemption for that, and the "keep it offshore" advice you may have read is how people acquire penalties rather than savings. What genuinely reduces the gain is ordinary and legitimate: principal residence relief where the property qualifies and the designation is made correctly, a properly built cost base including acquisition costs and capital improvements, the timing of the disposition, the treaty rules for real property, and credit for the foreign tax paid. See principal residence and foreign property.