You shouldn't have any tax issues other than what taxes you'll have based on the profit you make from your investments. As mentioned, you don't want to make a large cash deposit at a bank, as the bank is required to inform the feds anytime they receive over $10k in cash.
Personally I'd just use the cash for your daily expenses you'd typically use a cc or check for, and then use the money you aren't spending from your bank account for investing.
