A flat 20% on the gross
India has a dedicated rule, Section 115BBA, for foreign sports and entertainment income, and it is deliberately simple and gross. It taxes, at a flat 20% plus surcharge and cess, the India-source income of a non-resident who is not an Indian citizen and is a sportsperson, including an athlete, or an entertainer, and of a non-resident sports association. For a sportsperson it covers income from participating in a game or sport in India, from advertisements, and from contributing articles about the sport to Indian media; for an entertainer, from performing in India; for an association, amounts guaranteed in relation to a game played in India.
The hard edge is that no expenses are deductible. Unlike ordinary business income, where you net off your costs, this is taxed on the gross receipt, so your travel, agents and training costs do not reduce it. In return, it is simple: a single flat rate, and if this special income is all you earn in India and tax was deducted on it, you do not even have to file an Indian return. Note the internet often quotes an old 10% rate; the current rate is 20%.
The 20% deducted at source, even against a treaty
You usually meet this tax as a deduction at source. Whoever pays you, the league, the promoter, the brand, must deduct 20% under Section 194E, plus surcharge and cess, from the first rupee, with no threshold. So a foreign IPL player's fee, or a touring performer's payment, is withheld at 20% before it reaches them, which is why these contracts are often grossed up so the payer bears the tax.
One point that surprises people, and is settled by the Supreme Court in the PILCOM case, is that this deduction must be made even where a tax treaty might ultimately exempt the income. The payer cannot skip the 194E deduction on the assumption that a treaty applies; they deduct first, and any treaty relief is claimed afterwards by the sportsperson or association. So the tax comes off upfront regardless, and getting any treaty benefit is a later, separate step. A practising CA handles the 194E position, and pursues any treaty relief or refund where the income is genuinely covered by an agreement.