Tax Day is upon us, and 153 million returns are expected to be filed with the Internal Revenue Service this year.

This year, because of the weekend and a holiday, Tax Day falls on April 18, and there are no doubt people scrambling to meet the deadline or ask for an extension. But did you know $1.65 trillion in revenue is expected from individual income taxes this year, according to personal finance website WalletHub, and that 92% of federal revenue is brought in by the IRS?