Schedule 2 (Form 1040): Additional Taxes Explained

This guide follows the 2025 Schedule 2 and the IRS instructions for Form 1040, as of October 2026. Line numbers can move between years, so check the version for the year you're filing.

The two parts of Schedule 2

Part	What goes in it	Total goes to
Part I, Tax	Additions to tax such as repaying excess advance premium tax credit, clean vehicle credit repayments, and the alternative minimum tax	Form 1040, line 17
Part II, Other Taxes	Self-employment tax, payroll taxes on tips and wages, IRA and HSA additional taxes, household employment taxes, Additional Medicare Tax, net investment income tax and a long list of other taxes	Form 1040, line 23

Part I line by line

• Line 1a: excess advance premium tax credit repayment, from Form 8962.
• Lines 1b and 1c: repaying a new or previously owned clean vehicle credit you transferred to a dealer, from Schedule A (Form 8936).
• Lines 1d to 1f: recapture and excessive payments from elective payment elections on Form 4255, including a 20% amount.
• Line 1y: other additions to tax.
• Line 2: alternative minimum tax, from Form 6251.
• Line 3: add lines 1z and 2, then carry it to Form 1040, line 17.

Part II, the lines most people use

Line	Tax	Form attached
4	Self-employment tax	Schedule SE
5	Social Security and Medicare tax on unreported tip income	Form 4137
6	Uncollected Social Security and Medicare tax on wages	Form 8919
8	Additional tax on IRAs or other tax-favored accounts	Form 5329 if required
9	Household employment taxes	Schedule H
11	Additional Medicare Tax	Form 8959
12	Net investment income tax	Form 8960
13	Uncollected Social Security and Medicare or RRTA tax on tips or group-term life insurance from W-2 box 12	None

Line 17 has its own list, lines 17a to 17z, for less common taxes: recapture of other credits and of a federal mortgage subsidy, additional tax on HSA, Archer MSA and Medicare Advantage MSA distributions, golden parachute payments, section 409A and 457A deferred compensation, and interest on certain installment sales and section 1291 funds. Line 18 totals them, and line 21 brings Part II together for Form 1040, line 23.

The filing rule hidden in Schedule 2

Here's what catches people with low income: owing a Schedule 2 tax can make you file a return when you otherwise wouldn't have to. The IRS chart of other situations says you must file for 2025 if you owe any special taxes, including alternative minimum tax, additional tax on an IRA or other tax-favored account, household employment taxes, payroll tax on tips you didn't report, or recapture taxes.

The same chart says you must file if you had net earnings from self-employment of at least $400, or wages of $108.28 or more from a church that's exempt from employer Social Security and Medicare taxes, as of October 2026. So a student with a small side business, or someone who paid a nanny, may need a return and a Schedule 2 even with income under the standard deduction.

How it connects to the rest of your return

1. Fill in the forms that feed it first, such as Schedule SE, Form 6251, Form 4137 or Form 8959.
2. Copy each result to its line on Schedule 2.
3. Add Part I on line 3 and carry it to Form 1040, line 17.
4. Add Part II on line 21 and carry it to Form 1040, line 23.
5. Attach Schedule 2 behind your 1040 in attachment sequence order, along with the forms it names.

Schedule 2 has two siblings. Schedule 1 is for extra income and adjustments, and Schedule 3 is for extra credits and payments. If you're self-employed, you'll usually need all three alongside Schedule C.

Common mistakes

• Leaving self-employment tax off because income tax was low. Self-employment tax is separate and can still be due.
• Putting Social Security and Medicare tax on tips on line 5 when it belongs on line 13. Line 5 is for tips you never reported to your employer, while line 13 is for tax on tips you did report that your employer couldn't collect, shown in W-2 box 12.
• Forgetting Form 5329 for an early IRA withdrawal, so the additional tax isn't on line 8.
• Using a prior year's schedule. The 2025 form has new lines for elective payment elections.

Line 4 also has three boxes for exemptions from self-employment tax. Box 1 is for an approved Form 4361, which covers certain ministers and members of religious orders, and box 2 is for an approved Form 4029, which covers members of certain religious groups. If one applies to you, tick it, so the IRS can see why the line is blank or reduced.

The verdict

Schedule 2 isn't a form you choose. It's where the extra taxes from other forms land. Work out which feeder forms apply to you, carry the totals across, and remember that owing even one of these taxes can mean you have to file. Tax software does the routing, but it's worth checking line 4 and line 8, where most surprises sit.

Frequently asked questions

What is Schedule 2 used for?

It reports taxes that can't be entered directly on Form 1040, such as alternative minimum tax, self-employment tax, unreported tip tax, additional tax on IRAs and household employment taxes.

Where does the Schedule 2 total go?

Part I, line 3, goes on Form 1040, line 17. Part II, line 21, goes on Form 1040, line 23.

Do I need Schedule 2 if I'm self-employed?

Usually yes. Self-employment tax from Schedule SE goes on Schedule 2, line 4, and you must file if net earnings from self-employment were at least $400.

Is Schedule 2 the same as Schedule SE?

No. Schedule SE works out self-employment tax, and that result is then entered on Schedule 2, line 4.

Can owing a Schedule 2 tax make me file a return?

Yes. The IRS says you must file if you owe special taxes such as alternative minimum tax, additional tax on an IRA, household employment taxes or tax on unreported tips.