How to Pay Estimated Taxes in NC: Deadlines, Safe Harbor, and Filing

To pay estimated taxes in North Carolina, use Form NC-40 to submit four quarterly payments to the North Carolina Department of Revenue: online through the NCDOR “File & Pay” portal by bank draft or credit card, or by mail with a check to PO Box 25000, Raleigh, NC 27640-0640.¹² Payments are due April 15, June 15, September 15, and January 15 of the following year. You need to make these payments if you expect to owe $1,000 or more after subtracting withholding and credits, and the tax rate for 2026 is a flat 3.99%.³⁴

Do You Actually Need to Pay

The trigger is $1,000. If the tax on your North Carolina return, minus withholding and refundable credits, will come to that amount or more, the state expects quarterly payments.³ This usually catches freelancers, small business owners, landlords, retirees drawing pension or investment income, and anyone else whose income isn’t run through an employer’s withholding.

One exception matters: if you had zero North Carolina income tax liability the prior year, you owe no estimated payments this year regardless of what you expect to make.

The Four Quarterly Deadlines

North Carolina uses the same schedule as the IRS. Each payment covers a defined slice of the calendar year:

April 15, for income earned January 1 through March 31
June 15, for income earned April 1 through May 31
September 15, for income earned June 1 through August 31
January 15 of the following year, for income earned September 1 through December 31

When a due date lands on a weekend or legal holiday, it moves to the next business day.⁵ For mail, the postmark counts; for electronic payments, the transaction timestamp controls.

There’s a useful shortcut on the fourth installment: if you file your full North Carolina return and pay everything owed by January 31, the state waives interest on that final quarterly payment.³

Figuring Out What You Owe Each Quarter

Form NC-40 comes with a worksheet for this. Project your total North Carolina taxable income for the year, pulling in everything not subject to withholding: business profits, rents, investment returns, retirement distributions. Apply the 3.99% flat rate for 2026, then subtract any credits and expected withholding.⁴

Divide the result by four. That’s your quarterly payment. You’ll need your Social Security Number or ITIN on the voucher along with your projected income and credit figures.⁶ Hold onto the completed worksheet so you can reconcile your payments when you file your annual return.

Paying Online

The NCDOR portal handles estimated payments directly. Go to the Department of Revenue’s File & Pay page for individuals, choose the estimated income tax payment option, and enter your details for the current quarter.¹

Bank draft (ACH) payments are free. Credit and debit card payments, which are limited to Visa and MasterCard, carry a convenience fee of $2 per $100 of payment. A $250 payment, for example, costs an extra $6.⁷ That fee is nonrefundable. For anything but small payments, bank draft is the cheaper path.

Paying by Mail

If you’d rather send a check, download Form NC-40 from the NCDOR website, complete the voucher, and mail it with a check or money order made out to “NCDOR” to:

North Carolina Department of Revenue
PO Box 25000
Raleigh, NC 27640-0640²

Write your Social Security Number and the tax year on the check itself so the payment posts to the right account. Each quarter requires its own voucher.

Adjusting When Your Income Changes

Income doesn’t always arrive on schedule. If your earnings jump or fall after the first installment, rerun the NC-40 worksheet and spread the revised total across the remaining due dates. The NC-40 instructions set out the split:⁶

Adjusting by June 15: pay half the remaining balance then, one-quarter on September 15, one-quarter on January 15.
Adjusting by September 15: pay three-quarters of the remaining balance then, the last quarter on January 15.

If you don’t cross the $1,000 threshold until after April 15, your first payment is simply due at the next quarterly deadline. Land a large freelance contract in May, and your first payment is due June 15 rather than retroactively.

Safe Harbor: Paying Enough to Avoid Interest

You won’t be charged interest on an underpayment as long as your total payments and withholding equal at least the smaller of:

90% of the current year’s tax as shown on your return, or
100% of the prior year’s tax (the prior return must cover a full 12 months)

The prior-year option is the reliable one when your income swings. Match last year’s tax and you’re protected even if this year’s liability turns out to be far higher.³

Higher earners face a tighter version. If your North Carolina adjusted gross income exceeded $150,000 in the preceding year, or $75,000 if married filing separately, the prior-year safe harbor rises from 100% to 110%.⁸

What Happens If You Underpay

North Carolina charges underpayment as interest, not a flat penalty. The rate set under G.S. 105-241.21 runs on the unpaid portion of each short or missed installment, from the installment’s due date until you pay or until April 15 of the following year, whichever comes first.³ For the first half of 2026, that rate is 7%.⁹

Interest accrues daily. If you underpaid the April 15 installment by $2,000 and didn’t make it up until September, you’d owe interest on that $2,000 for every day it was outstanding. Late payments are applied to your earliest unpaid installment first, so catching up sooner cuts the total.

If uneven income timing is the reason you fell short, the annualized income installment method (Form D-422A) can reduce interest on the quarters when your income was low. Use it for one quarter and you must use it for all four, and you’ll mark the exception box on Form D-400 with the letter “A” when you file.¹⁰ If you get hit with an underpayment charge you think shouldn’t apply, the NCDOR has a written waiver process using Form NC-5500 covering good-compliance histories, deaths and serious illnesses, natural disasters, and other special circumstances.¹¹

A Different Rule for Farmers and Fishermen

If at least two-thirds of your gross income comes from farming or fishing, including oyster farming, you can skip quarterly payments and make a single installment by January 15 of the following year.³ That single payment must equal the lesser of 66⅔% of the current year’s tax or 100% of the prior year’s tax.

Better still, if you file your complete return (Form D-400) and pay the full balance by March 1, no estimated tax interest applies at all. Most farmers who qualify end up here. The two-thirds test can be met using either the current year’s or the prior year’s gross income, so a single off year doesn’t automatically knock you out.

1
NCDOR. File and Pay for Individuals
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NCDOR. NC-40 Individual Estimated Income Tax
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North Carolina General Assembly. North Carolina General Statutes 105-163.15
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NCDOR. Tax Rate Schedules
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Internal Revenue Service. When Are Quarterly Estimated Tax Payments Due?
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NCDOR. NC-40 Individual Estimated Income Tax Instructions
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NCDOR. FAQ About Bank Draft and Card Payments
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NCDOR. Form D-422 Underpayment of Estimated Tax by Individuals
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NCDOR. Interest Rate Memo for January 1, 2026 Through June 30, 2026
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NCDOR. Form D-422A Annualized Income Installment Worksheet
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NCDOR. Penalty Waiver Policy