Living a frugal lifestyle sometimes lends to a false sense of security. We take all the financial precautions to increase our savings rate and invest in broad-based index funds. Before long the net worth starts reaching for the stars and we feel good about ourselves.
Now, we decide, might be a good time to get a second car or trade for a new one. Moving to a smaller home, across town or to another state or country, sounds tempting and easy to do with your nest egg growing faster than you are spending.
Your habit of caution is well defined. There will be no stupid tax in your future! Careful planning leads to good decisions. You look before you leap.
Then it happens and you never even saw it coming. You paid a stupid tax without even realizing it was there.