It is business income, from an Indian source
For a creator, there is no special flat regime; your Indian earnings are ordinary business or professional income. A brand deal with an Indian company, sponsored content for an Indian audience, or ad revenue tied to India is Indian-source income for a non-resident because it arises from a business connection in India under Section 9. It is taxed on a net basis, so you deduct your genuine costs of producing the content, and pay tax on the profit at slab rates, subject to any treaty.
A distinction worth drawing: money from a foreign platform paid by a foreign payer, ad revenue from a global ad network, is generally not Indian-source unless you have a business presence in India, whereas a payment from an Indian brand for an Indian campaign clearly is. So it is the Indian-sourced part of your creator income that India taxes.
The wrong TDS section, and GST
Here is the NRI trap that catches creators and brands alike. The withholding sections the whole internet writes about, 194J for professional fees, and 194R for the value of free products, gadgets and trips given to influencers, both apply only to a resident payee. For a non-resident creator, neither is the right section; the correct withholding is under Section 195, the section for payments to non-residents. So an Indian brand that deducts 194J on your fee, which many do out of habit, has used the wrong provision, and a free product given to you as an NRI is not caught by 194R but dealt with under the non-resident rules. Getting this right matters for reconciling the TDS and claiming a treaty rate.
Separately there is GST, which is not income tax. Your promotion or advertising service is a supply, generally taxable at 18% once your turnover crosses the registration threshold. But where a foreign brand pays you in convertible foreign currency and the service is consumed outside India, it can be a zero-rated export, supplied under a letter of undertaking without charging the tax. For a genuinely non-resident creator the GST place-of-supply analysis is more involved, so it is worth checking rather than assuming. A practising CA reports the income correctly, fixes the TDS onto Section 195 with the treaty rate, and sorts the GST position.