North Carolina Quarterly Tax Calculator
Calculate your estimated quarterly tax payments for federal and North Carolina state taxes. Designed for self-employed individuals, freelancers, and independent contractors.
NC State Tax: Flat 4.5%
Quarterly Payment Amount
$6,429
Per quarter (4 remaining)
Annual Tax Breakdown
2026 Payment Schedule
Jan 1 - Mar 31
Due: April 15, 2026
$6,429
Apr 1 - May 31
Due: June 15, 2026
$6,429
Jun 1 - Aug 31
Due: September 15, 2026
$6,429
Sep 1 - Dec 31
Due: January 15, 2027
$6,429
Don't miss your quarterly payments!
The IRS may charge penalties and interest if you underpay or pay late. Consider setting up automatic payments or calendar reminders.
North Carolina Quarterly Tax Highlights
North Carolina has a flat 4.5% income tax rate
Rate has been reduced over several years
Use Form NC-40 for quarterly payments
North Carolina Quarterly Tax FAQ
What is North Carolina's income tax rate?
North Carolina has a flat 4.5% income tax rate. The rate has been gradually reduced from previous higher levels through tax reform legislation.
North Carolina Estimated Quarterly Tax Payments for Self-Employed Workers in 2026
Self-employed workers in North Carolina face two tax obligations: federal estimated taxes filed with the IRS and state estimated taxes filed with the North Carolina Department of Revenue. North Carolina imposes a flat 4.5% income tax rate on all taxable income. If you expect to owe $1,000 or more in North Carolina state income tax after withholding and credits, you must make quarterly estimated payments using Form NC-40.
North Carolina has been steadily reducing its flat rate from 5.25% (in 2021) to 4.5% in 2026, with plans to continue decreasing the rate. The state has a generous standard deduction of $12,750 for single filers.
| Tax Layer | Rate / Range | Filed With | Form |
|---|---|---|---|
| Federal income tax | 10% – 37% | IRS | 1040-ES |
| Self-employment tax | 15.3% | IRS | 1040-ES / SE |
| North Carolina state income tax | 4.5% | North Carolina Department of Revenue | Form NC-40 |
How North Carolina's Flat 4.5% Income Tax Affects Your Quarterly Payments
North Carolina uses a flat tax rate of 4.5%, which simplifies quarterly tax calculations. Regardless of income level, every dollar of taxable income is taxed at the same rate. This makes it straightforward to estimate your state quarterly payments — simply multiply your projected net self-employment income by 4.5% and divide by four.
For a single self-employed worker in North Carolina earning $100,000 in net self-employment income, the estimated annual tax breakdown is:
| Tax Component | Estimated Amount | Calculation Basis |
|---|---|---|
| Federal income tax | ~$11,600 | After $15,700 standard deduction, 2026 brackets |
| Self-employment tax | ~$14,130 | 15.3% on 92.35% of net earnings |
| North Carolina state income tax | ~$4,500 | 4.5% flat rate |
| Total annual tax | ~$30,230 | |
| Quarterly payment | ~$7,558 | Total / 4 quarters |
State payments can be made online through the North Carolina Department of Revenue portal at ncdor.gov, by mail with a Form NC-40 voucher, or via electronic funds transfer where available.
Federal Self-Employment Tax and Quarterly Due Dates
All self-employed workers must pay federal self-employment (SE) tax of 15.3% on 92.35% of net earnings. This consists of 12.4% for Social Security (on earnings up to $184,500 in 2026) and 2.9% for Medicare (no cap). An additional 0.9% Medicare surtax applies to earnings above $200,000 (single filers).
Both North Carolina and federal estimated tax payments follow the same quarterly schedule:
| Quarter | Income Period | Due Date |
|---|---|---|
| Q1 | January 1 – March 31 | April 15, 2026 |
| Q2 | April 1 – May 31 | June 15, 2026 |
| Q3 | June 1 – August 31 | September 15, 2026 |
| Q4 | September 1 – December 31 | January 15, 2027 |
To avoid underpayment penalties, pay at least 100% of your prior-year tax liability (or 110% if your AGI exceeds $150,000) spread across four equal payments, or at least 90% of your current-year tax. You can deduct 50% of your self-employment tax from your adjusted gross income, reducing both your federal and North Carolina taxable income.
Related Calculators
Official References
This calculator uses current federal and North Carolina tax rates and schedules:
- IRS Estimated Tax Guidelines
Federal quarterly tax requirements and Form 1040-ES
- NC DOR
Official North Carolina tax authority
- IRS Self-Employment Tax
Social Security and Medicare tax information
This calculator provides estimates based on 2026 tax rates. Your actual tax liability may vary based on deductions, credits, and other factors. Consult a tax professional for personalized advice.