How can I detect whether a position was closed by Stop Loss or Take Profit in MT5?

Yes sir, you can definitely detect this in MQL5.

The recommended way is to check the deals generated after a position is closed. MT5 stores the reason for every completed deal in the trading history, and you can read that information programmatically.

The most commonly used property is:

HistoryDealGetInteger(dealTicket, DEAL_REASON);

This returns the reason why the deal was executed.

Some commonly used values are:

-DEAL\_REASON\_SL
-> The position was closed because the Stop Loss was hit.

-DEAL\_REASON\_TP
-> The position was closed because the Take Profit was hit.

-DEAL\_REASON\_EXPERT
-> The position was closed by an Expert Advisor (EA).

-DEAL\_REASON\_CLIENT
-> The position was closed manually by the trader.

-DEAL\_REASON\_SO
-> The position was closed due to Stop Out.

A simple example is shown below:

ulong dealTicket = HistoryDealGetTicket(HistoryDealsTotal() - 1);

ENUM_DEAL_REASON reason = (ENUM_DEAL_REASON)HistoryDealGetInteger(dealTicket, DEAL_REASON);

if(reason == DEAL_REASON_SL)
{
   Print("Position closed by Stop Loss");
}
else if(reason == DEAL_REASON_TP)
{
   Print("Position closed by Take Profit");
}
else if(reason == DEAL_REASON_CLIENT)
{
   Print("Position closed manually");
}
else if(reason == DEAL_REASON_EXPERT)
{
   Print("Position closed by Expert Advisor");
}

Before reading the deal history, make sure you’ve selected the required history range using:

HistorySelect(fromTime, TimeCurrent());

This ensures that the completed deals are available for reading.

This approach is very useful when you want to:

-Calculate separate statistics for Stop Loss and Take Profit trades.

-Trigger different logic after a winning or losing trade.

-Send different webhook messages depending on how the previous trade was closed.

-Generate detailed trading reports inside your EA.

So, instead of guessing why a position was closed, you can directly read the deal reason from the MT5 trading history and handle each case accordingly.