The government levies the tax amount for carrying out administrative affairs. For saving tax one should adopt a way which is legal. If you have any interest amount left in you account, then you can pay tax with it. But for this purpose (to pay tax), it is unlawful to deliberately deposit amount and then take interest or do life insurance, for these are interest-based dealings which Muslims must shun from.
Allah (Subhana Wa Ta’ala) knows Best
Darul Uloom Deoband