I had initially confused TRC and Form 10F.

They're not the same document.

The TRC is issued by the tax authority of the country where you claim to be tax resident. Form 10F is additional information that may need to be furnished electronically for claiming treaty relief.

The Income Tax Department's current Rule 21AB guidance lists information such as residential status, foreign tax identification number, the period covered by the residence certificate and overseas address. It also says some of this information need not be separately provided if it is already contained in the TRC.

So if you're claiming DTAA relief in India, I'd keep both the TRC and the required Form 10F information ready.

I think there's another important point: don't assume that a TRC automatically means every type of income gets a reduced Indian tax rate.

The TRC establishes your tax residency for treaty purposes, but you still have to look at the specific DTAA between India and your country and the relevant income article.

For example, the treaty treatment of interest can be different from capital gains or employment income.

Also, if you're trying to claim a refund after TDS was deducted at a higher rate, the process may involve filing the appropriate Indian tax return and reporting the income and treaty claim correctly.

I'd keep the TRC for the relevant tax year and supporting documents rather than relying only on your foreign tax return or tax identification number.

From what I understand, if you're a non-resident claiming relief under an Indian DTAA, the TRC is an important requirement.

The Income Tax Department specifically states that a non-resident to whom a DTAA applies can claim relief under the agreement only if they obtain a Tax Residency Certificate from the government/tax authority of the foreign country where they are resident. It also says additional information is required electronically in Form 10F.

So I wouldn't treat an Indian PAN, passport, overseas address or bank statement as a substitute for the foreign-country TRC when the DTAA claim requires one.

The TRC basically establishes that you are a tax resident of the treaty country for the relevant period.

I would also check the specific DTAA article dealing with your type of income because the rate and conditions can vary depending on whether you're dealing with interest, dividends, salary, capital gains, pension or another type of income.