I already paid tax abroad, do I report that income in India?
Yes. A resident's return reports income wherever it arises, and Schedule FSI is where income from outside India and the tax paid on it go, country by country. Paying tax abroad does not take the income off the Indian return; it is what the foreign tax credit claim is built from. So the foreign tax is not an argument for leaving the income out, it is the reason the schedule exists. Report the income, report the tax, and keep the foreign document that evidences the tax was actually paid.
Does a small amount of foreign interest need Schedule FSI?
The test is whether there was foreign-source income during the year, not how much of it there was. A modest amount of interest from an account abroad puts you in the schedule on the same footing as a salary earned overseas. Two practical reasons to complete it properly anyway: the schedule has to agree with the account you have disclosed on the asset schedule, and credit for tax withheld abroad, however small, is only available if the income and the tax are both set out. Leaving out the trivial entries is what breaks the reconciliation.
Which year's foreign tax goes in Schedule FSI when the years differ?
This is a frequent source of mismatch, because the Indian year and the foreign year rarely close on the same date. Work from the foreign document: what income it covers, what period it relates to, and what tax it says was finally paid. Then map that to the Indian year the income belongs to, rather than to the year the foreign paperwork happens to be dated. Record the mapping, because anyone comparing an Indian year with a foreign assessment covering a different period will ask how the two relate.
Can I claim a foreign tax credit without completing Schedule FSI?
In practice no, because the schedule is the arithmetic the claim rests on. It sets out, country by country, the income arising outside India and the tax paid on it, and the credit follows from those entries rather than from an assertion that tax was paid. Claims fail far more often on paperwork than on principle: the income is described differently in the two countries, or the tax shown is a withholding rather than the final liability. Build the schedule from the foreign documents and the claim follows from it.
I worked abroad for part of the year, does Schedule FSI cover my salary?
If you are resident in India for that year and part of the salary arose outside India, it belongs in the foreign income schedule together with the tax paid on it. The residence position for the year decides the question, so establish that first, and remember that a change of residence part way through a year does not split one resident year into two returns. Keep the foreign payslips and the year-end statement from the foreign employer or administration, because the credit claim is built on what those documents say rather than on the contract.
The foreign assessment arrived after I filed in India, what now?
This happens routinely, because the two countries do not close their years together. The pragmatic order is to file on the evidence you actually have, note what is provisional, and put the position right once the foreign assessment is final. What matters is that three documents end up telling one story: the foreign assessment, the foreign income schedule on the Indian return, and the asset schedule showing the holding that produced the income. If the final foreign tax differs from the amount you claimed credit for, revisit the claim rather than leaving it.
What is double tax relief and how is it given?
Three mechanisms, and which one you get depends on your residence country's law and the treaty. Exemption leaves the foreign income out of the residence-country base. Credit taxes it and then subtracts the foreign tax, capped at the residence-country tax on that income. Deduction merely reduces taxable income by the foreign tax, and is usually the weakest. Canada and the United States lead with credit; several treaties give exemption for specific income types. See claiming the credit.
Which country do I pay tax to first?
Generally the source country — where the income arises — taxes first, often by withholding before you receive it. Your country of residence then taxes the same income and credits what the source country took. That order is why timing matters: a residence-country return filed before the source-country tax is settled has nothing to credit yet. Getting the sequence right is most of the work. See international tax planning.