Hi Caishen,
Thank you for your message.
You are correct in that if you close your positions in the same day you shouldn’t be charged overnight fees.
For context, overnight fees cover the cost of carrying a position over to the next trading day, which typically includes interest rates. Brokers can have their own policies for overnight charges but they should be upfront about these when you sign up.
PS you are right – there’s no such thing as a silly question here 😊
James Barra