A day after the Budget announcement of a revamped personal income tax regime, Revenue Secretary Sanjay Malhotra on Thursday said the government would eventually like to move to a simple and exemption-free tax structure with lower rates.According to an analysis by the Revenue Department, an individual earning Rs 15 lakh in a year will have to claim deductions of at least Rs 3.75 lakh under the old tax regime, otherwise the new revamped tax regime with lower rates proposed in 2023-24 will be more beneficial.