You need a better bank account then.
Let's say you have $10k in cash (typical emergency fund) and get 4% on it (relatively competitiv; e.g. Ally gives 4.25%), that's $400 in interest (not including compounding), which is a reportable amount of income. If you're doing something clever or have a bit more cash for some reason (e.g. saving for a house), you could easily get into more interesting amounts of money.