Since IB does their interest based on benchmark (BM) and they either pay you BM minus some percent (based on tiers) on your long currency and charge you the BM plus some percent on the short currency, it seems to be a headwind and interest expense can add up fast, especially leveraged. Question: Is this how all spot forex brokers do this? This must be a big $$ maker for IB. For example, had two long USD/JPY trade this month, and while the USD BM is slightly higher than the YEN (0.11% USD vs. 0.106%), but after they take off/add to the BM, those trades have a high interest charge. So, I am tier two, I got paid 0% for long USD and charged 1.106% for short YEN. Not complaining too much, it may shave 2-3% a year off performance, just wondering if all forex brokers do this?