Non-resident investors who do not provide permanent account number will no longer have to face higher tax deduction at source.
The income tax department has eased norms for non-resident investors, who will not be subjected to a higher rate of 20% tax deduction at source or TDS on their interest earnings, royalty or technical fee if they furnish some personal details and tax residency certificate from their home country and a few other easily available documents.

Source - http://economictimes.indiatimes.com