Lesson 4

Time is a tax

Every day the clock moves, a long option is a little less of a promise and a little more of a leftover.

Hold the stock still in your head. Same price, same vol, one day later. The call is cheaper. The put is cheaper. That drop is theta.

It is not a punishment. It is the market charging you rent for a chance that has one fewer day to happen.

Same stock, same vol, fewer days. The premium falls. That drop is the tax.

Two consequences, both practical:

Buying options is a race against the calendar. You need the stock to move, or vol to rise, faster than theta eats the premium.
Selling options is a decision to collect that rent. You win on quiet days. You lose on the day the stock actually jumps.

This is why “I will just buy a cheap far out-of-the-money call” is usually a bad sentence. Cheap often means almost no chance left, and the clock is still running.