@QuadPip is right (ish) (except - in theory, it’s HALF the spread that the price has to get within- but that is in theory) - it’s nothing to do with the “Actual” (read “Average”) price, except that that has to get within a half spread of the SL, or in case of a TP , has to PASS the TP by “half a spread” (Theory again) . To understand, you need to look at the ‘bid’ and ‘ask’ Prices.