I see that several governments are charging or thinking of charging tax on Bitcoin gains. I know that in the domain name industry several registrars and domain name sellers accept Bitcoin as a payment method. I am one one of them, and I am far from unique. I'm thinking of quoting domain name prices in Bitcoin to remove the currency equivalent. So that raises two questions. Will this help the buyer to save tax? Is this an incentive to buyers to switch investments from one appreciating asset into another?
In the USA you have to pay capital gains taxes anytime you convert, cash out, or spend BTC regardless of the amount. So right now there is no savings.
Congress is considering an exemption on transactions up to $600. If they pass that, then yes it will probably save the taxes to pay for services directly with BTC. But it's not law yet.