When you're leaving home in the morning to go to work when should you say 行ってきます and when should you say 行きます?
Or is it just personal style?
Also let's say I'm at the office and leave to visit customer and then I plan to go home after that. Is it ok to say 行ってきます even though I don't plan to return to the office after the customer visit? Or should I say just 行きます to say I'm going (but not necessarily coming back).