As my dividend receipts from mutual fund units were tax free under section 80 L, will I loose because of the new budget provision whereby my mutual f

The above statement is partially true. 10% tax on dividend paid is not applicable for funds which have invested more than 50% in equity for next three years. Hence, if you have invested in an equity scheme, you will not loose out for the time being. However, in case of debt funds, your statement is true.