Patent royalty taxation option form requires assessee details, patent particulars, royalty income, expenditure data, and authorised declaration. Form No. 65 prescribes the particulars to be furnished by an assessee exercising the option to offer income by way of royalty in respect of a patent for taxation under the specified income-tax rule. It requires assessee details, tax year particulars, confirmation of option exercise and return filing, and information on whether the royalty income is not offered to tax in any of the five succeeding tax years after the option is first validly exercised. It also seeks details of the eligible patent, royalty income, expenditure incurred, and a declaration by the authorised signatory.