10 Key IRS Tax Forms, Schedules and Publications for 2025

IRS Form 1040 is the standard federal income tax form people use to report their income, claim tax deductions and credits, and calculate their tax refund or tax bill for the year. There are three schedules that you may or may not have to tack onto it, depending on your tax situation and whether you want to claim certain deductions and credits.

Schedule A is for itemizing your deductions — property taxes, charitable contributions, mortgage interest, state taxes, medical expenses or a myriad of other tax breaks. Its tax-bill-reducing powers make it one of the single most valuable IRS forms in the stack.

Schedule C is where you report the profits and losses from freelancing, side gigs or contractor work. It’s also where you can deduct expenses related to the growth and development of your business, such as advertising, home office expenses or office supplies.

» Learn more: See our guide to taxes for freelancers and self-employed people

If you trade stocks, bonds or other instruments, Schedule D is for you. It’s where you tally your capital gains and losses for the year. If you’re like most investors, some of your investments probably did well, and some probably didn’t. Report both types: Up to $3,000 of your net losses could be deductible ($1,500 for those married filing separately), and Schedule D is where that mathematical magic happens. You’ll likely need information from other IRS forms called 1099s (see below) to get it done.

A W-2 is an IRS form your employer sends you in January or early February. It shows how much your employer paid you during the year, what you contributed to your employer-sponsored retirement plan and the amount of taxes withheld on your behalf. A copy goes to the IRS, so be sure you report this information accurately.

Side note: The W-2 has a cousin called the W-4, which you fill out for your employer when you get a new job. If you got a huge refund last year, tweak your W-4 to reduce how much tax your employer is taking out of your paycheck — otherwise, you may be needlessly living on less throughout the year.

If you have a mortgage, you’ll get a 1098 form in the mail or your inbox. It shows the interest ($600 or more) you paid on your home loan during the year, and that mortgage interest is generally deductible. Students might get a 1098-T, which reports tuition payments they’ve made, or a 1098-E, which reports the interest they’ve paid on their student loans. Student loan interest and tuition payments may also be deductible.

The 1099 tax form comes in several flavors, but the big five are the 1099-DIV, 1099-INT, 1099-B, 1099-MISC and 1099-NEC. These IRS forms are all records of income you’ve received from a source other than your employer, and whoever sends you one also sends the IRS a copy, so don’t forget to report it on your return.

In a nutshell, the 1099-DIV reports dividends and distributions from investments; the 1099-INT reports interest you earned on investments; the 1099-B comes from a broker and lists your reportable investment activity; and the 1099-MISC and 1099-NEC are for most everything else not derived from investments, such as money a client paid you for freelance work.

If you filed your return and then realized you made an error, the 1040-X can help. You may need to include copies of your other tax forms when you file it. If you find out you owe more due to your mistake, you can still pay the IRS online.

File Form 4868 with the IRS by the April deadline — you can even do it online — and you’ll buy yourself a tax extension until October. But be aware that you have to make a good estimate of what you owe the IRS and send in some or all of that amount along with your extension request.

If the estimated tax payment you send in April is less than what you actually owe, you’ll need to pay interest on the difference. And don’t miss your extended deadline: You could face a late-filing penalty of 5% of the amount due for every month or partial month your return is late.