Your best friend in tax document form if you earn money from anywhere (or anyone) other than your regular 9-5. Collect them from freelance clients or the bank that paid interest on your savings account. Then use the info to fill out your tax return.
When the gov cuts you a break, and lets you subtract some costs from your taxable income. Choose between the standard (flat-rate) discount or itemized one, where you add up all the dolla bills you could get off and hope it’s higher.
That form you fill out when you start a new job. It tells your company how much to withhold from your paycheck. Psst...you might wanna edit yours when you: have a kid, get married, or cash a big tax refund check.