Quote from Daal:
How this triple interest applies to EFPs, I dont get this
Assume you sold 10K worth of EFP. Say your stock leg has went up to 15K and now your account is -5K. If you cover 5K of EFP on tuesday, the delivery will take place on friday. So over the weekend you are flat. If you do it on any other day, you will be responsible for the interest over the weekend.