The trade-off for this flexible feature is that brokers who do allow early trade closure tend to have lower payout rates.
When trading with a binary option broker that allows early closure of an option trade, the value of the option tends to move along with the value of the underlying asset.
For example, with a “put” (or “down”) option play, the value of the option contract increases as the market moves below the target (strike) price.
This means that, depending on how far it has moved passed the strike, the closing value of the option may be more than the risk premium paid (but never greater than the agreed maximum payout).
Binary Put Option Risk Graph
Conversely, if the underlying market moved higher, further out-of-the-money, the value of the option contract decreases and the option buyer would be returned much less than the premium paid if he/she closed early.
Of course, in both cases, the broker commission is factored into the payout of an option trade when closed early.
So before you decide to jump head first into trading binary options, make sure you do your research and find out what your broker’s payout rates and conditions are!