Spend bitcoin on goods and services directly, then it will not become a taxable event, then you will be able to spend it and avoid taxes and maybe even bitcoin will grow even more before you spend it all 
This is NOT true in the U.S.A.
In that country, spending bitcoins on goods and services directly IS a taxable event.
Or if you really want to exchange it to cash, you can do it via some other good, like gold for instance, chances are it will not be a taxable event either.
This is NOT true in the U.S.A.
In that country, exhanging bitcoins for some other good or asset IS a taxable event.
But storage bitcoin does not lead to the need to pay any taxes?
If I bought pizza for one bitcoin, would this mean that the seller made a profit of $ 15,000- $ 25?