Determination engine

Which state do you actually withhold in?

Reciprocity, convenience-of-the-employer, nonresident thresholds and unemployment localization, applied together to one employee's facts. Every answer cites the state source it came from.

Withhold North Carolina income tax.

South Carolina residents get no exemption from North Carolina tax, so the work state governs.

Income tax withheld to

North Carolina

Flat 3.99%

Employee certificate

NC-4

Employee's Withholding Allowance Certificate (NC-4EZ and NC-4 NRA variants also exist)

Unemployment insurance

North Carolina

Localized under factor 1: Localization.

Reciprocal agreement

North Carolina has no reciprocal agreements.

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Withhold North Carolina nonresident income tax

North Carolina taxes wages earned inside the state by nonresidents, and no reciprocal agreement covers South Carolina residents. North Carolina requires withholding from the first dollar of in-state wages.

South Carolina also taxes this income, with a credit

The residence state taxes worldwide income. The employee claims a credit on the South Carolina return for tax paid to North Carolina, which prevents true double taxation but usually still leaves a balance if South Carolina's rate is higher. Some employers withhold for both states; many withhold only for North Carolina and let the employee manage the difference.

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Employer registrations you will need

North Carolina — Income tax withholding: North Carolina Department of Revenue
North Carolina — Unemployment insurance: North Carolina Division of Employment Security (DES)

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Get the form

NC-4 — North Carolina (official state source)

North Carolina profile South Carolina profile Full write-up for this pair

Change the inputs

Withholding determination

Answer six questions. The result is a shareable link, so you can paste it into a ticket or an email.

Employee lives inState of residence

Work is performed inWhere the employee physically sits

Employer is based inWhere the work is directed from

Days in the work stateThis calendar year, leave blank if unknown

Wages from work-state daysUS dollars, leave blank if unknown

Arrangement Works remotely rather than at an employer location Remote work is an employer necessity, not employee preference

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This is a determination aid, not advice. StateSide encodes published state rules and applies them mechanically to the facts you enter. It does not know your entity structure, your nexus history, your equity compensation, or the dozens of exceptions that turn a clean rule into a judgement call. Every determination cites the state source it came from — verify against that source, and take anything consequential to a payroll tax professional before you act on it.