North Carolina tax filing: file NC state taxes online, Form D-400, flat 4.25% rate

Do you have to file a North Carolina tax return?

North Carolina sets its filing requirement at the standard deduction for your status: if your gross income for 2025 is more than the standard deduction, you must file a Form D-400. Because the standard deduction and the filing threshold are the same numbers, the cutoffs are easy to read:

You also file if North Carolina tax was withheld from your pay and you want it refunded, or if you had net self-employment earnings that require a federal return. Full-year residents, part-year residents, and nonresidents who earned North Carolina income all use the same Form D-400; part-year residents and nonresidents attach Schedule PN to prorate income to the state. The current requirements are published by the North Carolina Department of Revenue, and the state tax filing pillar compares North Carolina with the other states.

The flat rate and standard deduction

North Carolina taxes income at a single flat 4.25 percent for tax year 2025. There are no brackets: every dollar of North Carolina taxable income is taxed at the same rate. The rate has been falling on a set schedule, from 4.50 percent in 2024 to 4.25 percent in 2025, and it drops again to 3.99 percent in 2026, with additional reductions possible in later years if the state's revenue triggers are met.

Against that rate, North Carolina applies a standard deduction that is larger than it used to be:

North Carolina has no personal exemptions; the standard deduction does that work. Unlike the federal return, North Carolina gives no extra standard deduction amount for being 65 or older or blind. Families do get a separate child deduction for each child who qualifies for the federal child tax credit, worth up to $3,000 per child at the lowest income tiers and phasing down to zero as income rises. You can take the standard deduction or itemize on North Carolina Schedule A, whichever is larger.

Retirement income and the North Carolina Bailey exemption

North Carolina is friendlier to retirees than its flat rate alone suggests, mostly because of a few specific subtractions.

Social Security is not taxed. North Carolina fully deducts Social Security and Railroad Retirement benefits to the extent they were taxed on your federal return, so those benefits are effectively state-tax-free.

The Bailey exemption. Under the Bailey court settlement, certain federal, state, and local government retirement benefits are completely exempt from North Carolina tax for retirees who had at least five years of creditable service as of August 12, 1989. That includes military retirement for those who qualify, and it is claimed on D-400 Schedule S.

Military retirement deduction. Separately, for tax years beginning in 2022 and later, military retirement pay is deductible to the extent it is included in federal adjusted gross income for retirees with 20 or more years of service or those medically retired, even if they do not qualify under Bailey.

Other retirement income, such as private pensions, 401(k), and IRA withdrawals, is generally taxed at the flat 4.25 percent. TaxFile checks these subtractions against your income so you do not pay North Carolina tax on benefits the state exempts.

North Carolina tax filing deadline, extension and filing online

North Carolina's deadline is April 15, 2026 for tax year 2025 returns, matching the federal date. The state grants an automatic six-month extension to file, to October 15, 2026. If you have a federal extension, North Carolina honors it automatically as long as you certify it on the state return, so most filers do nothing extra. If you need a state extension without a federal one, file Form D-410 by April 15.

As always, the extension moves the filing date, not the payment date. North Carolina charges a late-payment penalty unless you pay at least 90 percent of your tax by April 15, and interest runs on any unpaid balance from the original due date. One thing that makes North Carolina simpler than many states: there are no local or county income taxes, so the D-400 is the only income tax return most residents file.

Filing electronically is the practical default, and the North Carolina return builds on your federal figures. TaxFile prepares both from one pass:

• Upload or talk. Drop in your W-2s and 1099s and it reads them, or describe your year and it asks what it needs.
• Federal and North Carolina together. One set of documents produces both returns, with the flat 4.25 percent rate and the correct standard deduction applied.
• Deductions checked. It claims the child deduction and tests the Social Security, Bailey, and military retirement subtractions where they apply.
• Error check, then you approve. Nothing is e-filed until you review and approve every line, through an authorized IRS e-file provider.

Pricing is $39 for a simple return, $89 self-employed, $199 business, plus $19 for each state return. There is no free tier. If your North Carolina income comes from contract or freelance work, self-employed tax filing covers Schedule C and Schedule SE in more detail. TaxFile does not e-file federal extensions or prepare amended returns, and does not handle capital gains on Schedule D, rental income on Schedule E, or cryptocurrency. TaxFile is self-prepared tax software and does not provide personalized tax advice, and no refund amount is guaranteed.