<h1>Income attributable to transfer of assets in India requires an accountant's report filed online with UDIN and a valid PAN.</h1> Form 4 is an accountant's report for computing income attributable to transfer of assets located in India, to be filed once in a tax year along with the return of income through the e-filing portal with a valid PAN and UDIN. The form requires supporting valuation, financial, and sale-related documents, cannot be edited after submission, and does not require proof of tax payment at filing, though payment evidence may be needed for return processing.