I don't know what is the connection between pay bill and passive income. Actually your question isn't clear enough. Bitcoin isn't available in every country till now. But in future, we can expect bill pay services.
He is mention of taxes for which we need to pay for the trading of cryptocurrencies. We are getting profit from the cryptocurrencies trading,it's fair enough to pay of bills.If the bitcoin became a legal currencies ,we can also pay our bill with the bitcoin.