In case of a national crisis and financial emergency, the govt. can seize our bank accounts and freeze the fixed deposits .etc. Mostly during war, it is done so. It’s called - Mobilization of resources to protect the sovereignty. It happened only once in my knowledge in pre-independent India in 1945, during World War II, when India fought for the British. BTW, Govt. does not pay you back or refund the same after the situation is restored back to normalcy. You just get a certificate of your contribution to the nation. Since India’s money and resources were already exhausted into the WW2, while fighting for the Britishers, they had sucked it all and when they realized nothing is left of us is when they decided to free India, basically abandon it. One of the many reasons India got independence in 1947.
This link talks further about instances when GoI breached sovereign guarantee or came close to doing so.