North Carolina Supplemental Tax Regulations for Amazon RSUs
North Carolina has a flat 4.50% individual income tax rate. Supplemental wages are withheld at 4.50%, minimizing the state-level tax variance.
North Carolina Safe Harbor & Underpayment Penalties
Form NC-40 estimated payments due quarterly.
Employer Stock Plan Specifics: Morgan Stanley at Work (Shareworks) / Fidelity
Amazon equity packages are heavily backloaded into years 3 and 4 (40% each year). In year 3, your total W-2 income can leap into the 37% marginal bracket, while Morgan Stanley only withholds 22% federally. Without quarterly estimated payments or selling additional shares, Amazonians face a $15,000–$40,000 tax shock in April.
When vesting at Amazon, Morgan Stanley at Work (Shareworks) / Fidelity calculates automatic sell-to-cover withholding using North Carolina's statutory supplemental rate of 4.50% combined with the federal supplemental rate (22% on up to $1M). Because top earners in North Carolina reach marginal brackets exceeding these rates, you will face an incremental shortfall on April 15.
Localized CPA & Advisory Referral
Advisor Guidance: Match with a Research Triangle CPA to optimize multi-year tech equity vesting and NC NC-40 estimated vouchers.