Time-in-Force: Day, GTC, IOC, and FOK Explained

Key Takeaways

• Time in force determines whether an unfilled order expires at the close (Day), persists for weeks (GTC), or cancels instantly if not fully filled (FOK).
• Most US brokers cap GTC orders at 60 to 90 days, meaning "good-til-canceled" is not actually indefinite.
• A common mistake is pairing a GTC entry with Day exits in a bracket order, leaving a filled position unprotected overnight.
• Choosing the right time-in-force setting is an operational decision that directly affects whether your order strategy executes as planned.

What It Is

FINRA describes time-in-force as the set of time parameters and qualifiers attached to a stock order. The underlying order (market, limit, stop) answers what and at what price. The time-in-force answers for how long. Every order you submit has a TIF, even if the broker hid it behind a default.

Different TIF choices suit different situations. A day order matches most casual retail trades. A GTC suits patient limit orders. An IOC or FOK is for traders who need speed or size certainty.

The Intuition

Orders do not float in the market forever. Every venue needs a rule for when to stop trying to fill and move on. The TIF is how you pick that rule.

Without TIF choices, you would either have to re-enter orders every few minutes or accept that unfilled orders sit out there indefinitely. Neither is ideal, so exchanges standardized a handful of named options that cover the useful range.

How It Works

The common time-in-force choices are:

• Day. Expires at the close of the current regular session if not filled. FINRA notes this is the default on many retail platforms. Simple and safe.
• GTC (Good-til-Canceled). Remains active across sessions until filled or canceled. Most US brokers cap GTCs at 60 to 90 calendar days per internal policy, even though the name suggests forever.
• IOC (Immediate-or-Cancel). Fill whatever portion is available right now, cancel the rest. Partial fills allowed.
• FOK (Fill-or-Kill). Fill the entire order immediately or cancel it entirely. Partial fills not allowed.
• GTD (Good-til-Date). Remains active through a specific end date you choose, typically up to the broker's GTC cap.
• MOC (Market-on-Close). Executes as a market order at the closing auction.
• LOC (Limit-on-Close). A limit order that routes to the closing auction.

Limit buy @ $50, 1,000 shares

Day: expires 4:00 p.m. ET today, whatever is unfilled
GTC: lives for 60-90 days until filled or canceled
IOC: take whatever 1,000 or less is available right now,
     cancel the remainder
FOK: take exactly 1,000 right now, or take nothing
GTD (end of week): live until Friday close

The order-type label (limit, stop, etc.) and the TIF combine independently. A limit order can be a Day, GTC, IOC, or FOK. A market order is almost always Day, because a market order by design wants to fill immediately and a non-Day qualifier rarely applies.

Worked Example

You want to buy 5,000 shares of a liquid large-cap at $100.00 or better. The displayed size at $100.00 is only 2,000 shares. You must choose a TIF.

Option A, Day limit. Your order rests on the book at $100.00 for the entire session. The 2,000 shares at $100.00 fill immediately. More sellers join later in the day, and by 3:45 p.m. you have accumulated 4,200 shares. At the 4:00 p.m. close, the remaining 800 shares cancel. You can resubmit tomorrow.

Option B, IOC. Only the 2,000 displayed shares fill. The other 3,000 cancel immediately. You got a quick partial but now need to decide whether to chase the rest.

Option C, FOK. The market cannot fill all 5,000 at $100.00 at that instant, so the entire order cancels. You own nothing.

Option D, GTC. The order behaves like Option A today, but if 800 shares remain unfilled at close, they rest through tomorrow, continuing until filled or until the broker's GTC window expires.

Common Mistakes

1. Treating GTC as infinite. Most US brokers time out GTC orders after 60 to 90 days. Check your firm's policy. If your thesis requires a longer horizon, diary a reminder to re-enter.

2. Forgetting resting GTCs after a thesis change. A stock that drops because the story broke down can still sweep through your stale GTC buy. Review open GTCs when the underlying fundamentals change.

3. Confusing IOC with FOK. IOC accepts partial fills; FOK does not. Using FOK when you only care about speed can leave you with no fill at all.

4. Applying Day TIF in extended hours sessions. Pre-market and after-hours sessions have their own TIF rules at many brokers. A regular-session Day order usually does not execute during extended hours. If you need to trade 4:00 a.m. to 9:30 a.m. ET or after 4:00 p.m. ET, choose an extended-hours TIF.

5. Using MOC or LOC without understanding the closing auction. Closing-auction orders have cutoff times, typically around 3:50 p.m. ET. Submitting late means the order does not participate. Read your broker's cutoff schedule.

Frequently Asked Questions

Q: What is time in force in simple terms? Time in force tells the exchange how long to keep trying to fill your order. Day means cancel at 4 PM. GTC means keep trying for up to 60 to 90 days. IOC means fill what you can right now and cancel the rest.

Q: How does time in force affect investment decisions? It determines whether a missed fill becomes a second-day opportunity or a permanent miss. It also governs whether resting orders remain exposed to adverse developments in the underlying security while you are not watching.

Q: What is a real-world example of time in force? A GTC buy limit at $100 placed on a large-cap. Three weeks later a sector headline drops the stock to $100 on a day when your thesis no longer holds. The order fills because you forgot to cancel it. The story changed; the GTC did not.

Q: How can investors use time-in-force settings effectively? Default to Day for most trades, switching to GTC only for patient entries where you have confirmed the thesis and the price target remains valid. Review all open GTCs every week.

Q: How is IOC different from FOK? IOC (Immediate-or-Cancel) fills whatever is available right now and cancels the rest, accepting partial fills. FOK (Fill-or-Kill) either fills the entire order immediately or cancels everything, accepting no partial fills.

Sources

1. FINRA. "Trading Terms: Time Parameters and Qualifiers on Stock Orders." https://www.finra.org/investors/insights/time-parameters-qualifiers-stock-orders
2. FINRA. "Order Up! Six Common Types of Stock Orders." https://www.finra.org/investors/order-six-common-types-stock-orders
3. SEC Investor Bulletin. "Understanding Order Types." https://www.sec.gov/resources-for-investors/investor-alerts-bulletins/ib_ordertypes
4. FINRA. "Order Types." https://www.finra.org/investors/investing/investment-products/stocks/order-types

Disclaimer

This article is educational content only and is not financial advice. Nothing here is a recommendation to buy, sell, or hold any security. Consult a licensed advisor before making investment decisions.