GOLDEN HANDCUFFS // FYI 2026.RSU
COMPANY EQUITY MODEL AMZN • $215 PUBLIC TRADED

Amazon RSU Tax Calculator (2026)

Deterministic tax model calibrated for Amazon equity packages administered via Morgan Stanley at Work (Shareworks) / Fidelity. Discover your true supplemental withholding gap and incremental share sales required.

Preset Loaded: Amazon (AMZN) • 5% Year 1, 15% Year 2, 40% Year 3, 40% Year 4 (Semi-annual in Y1-2, quarterly in Y3-4)
Brokerage: Morgan Stanley at Work (Shareworks) / Fidelity
Vest & Comp Parameters2026.1 PROTOCOL
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Tax Filing Status
IRC § 3402(g) GAPEstimated April Tax Shortfall
$6,123

Your employer's brokerage will automatically sell shares at flat statutory rates (34.44% combined), leaving a $6,123 unpaid tax gap when your W-2 is filed in April.

Incremental Shares to Sell29 SHARES Liquidate manually upon vest to cover estimated federal & state gap
Net Shares Kept After Full Tax266 / 450 Retained value: $57,190
Total Gross Vest$96,750450 shares @ $215/share
Brokerage Sell-to-Cover$33,321155 shares liquidated automatically (34.44%)
True Federal Liability$28,308 Marginal 35.00% bracket on total comp $281,750
State Tax (CA)$8,998 Statutory withheld: $9,898 (10.23%)
2026 FICA Withholding$2,139 SS ($184.5k cap): $0 • Med: $2,139
Actual True Total Tax$39,444 Effective true tax rate: 40.77%
SPONSORED FIDUCIARY ADVISORYSAFE-HARBOR MATCH
Match with a Fiduciary CPA to calculate quarterly safe-harbor payments

Connect with a California Tech Equity CPA to calculate Form 540-ES estimated payments and protect against CA underpayment penalties. Ensure Form 1040-ES and state vouchers protect you against IRS underpayment penalties (IRC § 6654).

Schedule 15-Min Safe Harbor Review

Amazon Equity Plan & Tax Architecture

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.

Vesting Schedule & Cadence

Structure: 5% Year 1, 15% Year 2, 40% Year 3, 40% Year 4 (Semi-annual in Y1-2, quarterly in Y3-4)

Equity awards at Amazon are subject to standard supplemental wage withholding at vest. Because Amazon stock (AMZN) may fluctuate between grant date and vest release date, tracking your fair market value (FMV) basis is critical for post-vest capital gain accounting.

Brokerage Administration & Sell-To-Cover Mechanics

Stock Plan Administrator: Morgan Stanley at Work (Shareworks) / Fidelity

Default automated sell-to-cover withholds at standard 22% federal statutory rate. Because Years 3 and 4 vest 40% of total grant value, employees routinely face massive underwithholding.

Calculate Amazon RSUs by State of Residence

State supplemental withholding rates vary dramatically from 0% in Washington, Texas, and Florida up to 10.23% in California and 11.70% in New York: