On its consolidated Form 1099-B, IB lists four items. Which of these are deductible? "Margin Interest Paid" - this is deductible for sure, per TurboTax on the "Investment Interest Expenses" page Payment in Lieu Paid - no idea what this is, but it's 0 anyway Advisory Fees Paid - same Other Fees Paid - this is over $1k. What are these fees? Market data? TurboTax has a page for "Investment Expenses, other than interest expenses". Can someone confirm whether these "Other fees paid" are deductible and where, ideally by citing a source?
Better check with IB to confirm what are those expenses exactly. Whether they are deductible or not would depend on what those expenses are, that would be my guess.
1. Yes, although depending on your filing status it may be limited 2. This is being short dividends or similar. Probably it should be capitalized into the trade it originated from (possibly depending on holding period), although otherwise it may be deductible depending on your status. 3. No longer deductible. 4. likely market data, position transfer, funds transfer, ADR fees, and the like. You probably need to file as a trading business of some sort for these to be deductible.
IB said they're mostly market data fees, and details can be found on the annual statement. Predictably, they wouldn't advise whether they're deductible or not.