Johann Koeber
Happy Owner
I dont think you pay interest if you daytrade with margin, I don't. If it's two days, then your Math sounds right
Daytrading is buying and selling on the same day.
Interest is charged for the night.
Daytraders closing all positions the same day will pay no brokers interest.
If you sell 2 days later (2 nights involved, 4 on a typical weekend) you will pay broker interest for 2 or 4 days (but it is for the nights actually).