What MAP is, and when it is the right tool
A normal tax appeal only argues the Indian side of a dispute, before an Indian appellate authority. But some problems are cross-border by nature: the same income taxed in both India and your country of residence, an adjustment in one country that is not matched by relief in the other, or a disagreement about whether you have a permanent establishment in India or which country you are resident in. For these, the tax treaty itself provides a different route, the Mutual Agreement Procedure, usually in the article on mutual agreement. It lets you ask the competent authorities of both countries, the officials designated to apply the treaty, to sort the problem out between themselves.
This is founded on the treaty, which in India takes effect through the provision that gives treaties their force, Section 90. The relief, when it comes, is the two governments agreeing how the income should be taxed so that you are not taxed twice against the treaty. That is something a domestic appeal cannot deliver, because an Indian court can only bind the Indian side. MAP is most heavily used for transfer-pricing adjustments and permanent-establishment disputes, but it is genuinely available to an individual NRI who is suffering real double taxation that the treaty was meant to prevent.
How you invoke it, and how it runs
You invoke MAP by applying to the competent authority. In India that authority sits within the Central Board of Direct Taxes, and the application is made on a prescribed form under Rule 44G. Timing matters: most treaties require you to apply within three years of the first notification of the action that led to the taxation not in accordance with the treaty, though a few older treaties differ, so the exact window depends on your country's treaty. The Indian authority then takes the case up with its counterpart in your country and they try to reach agreement, with the guidance encouraging resolution within a couple of years.
A useful feature is that MAP does not force you to give up your ordinary appeal. It can run in parallel with a domestic appeal before the Indian appellate authorities, so you keep both options alive. If the two competent authorities reach a resolution and you accept it, you then withdraw the corresponding appeal and the agreed outcome is given effect. If you do not like the resolution, you are not bound to accept it and can fall back on your appeal. Under the Income-tax Act, 2025 the treaty provision is renumbered to Section 159 from FY 2026-27, but the treaty-based MAP mechanism itself carries over unchanged. A practising CA judges whether MAP is the right route for your double-tax problem, files it in time, and runs it alongside any appeal.