I've always felt that many novice traders don't fully understand GTC orders. This thing seems simple, but used properly, it can save a lot of effort.

Simply put, GTC is short for Good Til Cancelled, a type of limit order that allows you to set a target price and then leave it alone. Unlike day orders that automatically cancel at market close, GTC orders stay active until they are filled or you manually cancel them. Most brokers set an automatic expiration between 30 to 90 days to prevent orders from lingering indefinitely in the system.

I've encountered scenarios like this: a stock is currently quoted at $55, which I think is a bit expensive, but if it drops to $50, it's worth entering. Instead of watching the market every day, I can just place a GTC buy order at $50. Once the price drops to that level, the order automatically executes, and I get the price I want. The same applies in reverse: if I hold a stock at $80 and want to sell at $90 to lock in profits, I can set a GTC sell order without constantly monitoring the market.

But this convenience also comes with risks. The most common is accidental execution due to price volatility. For example, if a stock drops sharply due to negative news, your GTC buy order might fill at the lowest point, and then the price continues to fall. Another situation is a gap: if a stock closed at $60 the day before and opens at $50 the next day due to major news, and your GTC sell order is set at $58, it might execute around $50, far below your expectation.

Therefore, the biggest problem with GTC orders is that they can be easily forgotten. Once placed, you might not check on them for a long time, and by then, market conditions could have changed completely, but the order remains active and could trigger at any moment. My advice is to review and adjust these orders regularly, especially before major events like earnings reports or economic data releases.

Comparing day orders and GTC limit orders makes the difference clearer. Day orders are only valid for the trading day; they cancel automatically at market close, suitable for traders aiming to capture short-term fluctuations. GTC orders can span multiple trading days, making them more suitable for long-term holders with clear target prices. The advantage of day orders is that risk is relatively controlled since exposure is only for one day, but GTC offers greater flexibility and can help automate your strategy.

Overall, GTC orders are a useful tool that can help you execute trading strategies without constantly watching the market. But the key is to review these orders regularly to ensure they still align with your current trading plan. Markets change, and so should your strategies.