GOLDEN HANDCUFFS // FYI 2026.RSU
STATE PRESET PRIVATE • $42 Illinois (IL)

Stripe RSU Taxes in Illinois (2026)

2026 RSU tax estimate for Stripe employees living in Illinois. Compares default brokerage withholding (4.95% state + 22% federal) against actual marginal tax brackets.

Preset Loaded: Stripe (Private) • Quarterly vesting (historically double-trigger RSUs modified via company-sponsored liquidity and tender offer settlements)
Brokerage: Carta / Morgan Stanley at Work
Vest & Comp Inputs2026 RATES
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Tax Filing Status
IRC § 3402(g) GAPEstimated April Tax Shortfall
$14,106

Your employer's brokerage will automatically sell shares at flat statutory rates (29.24% combined), leaving a $14,106 unpaid tax gap when your W-2 is filed in April.

Incremental Shares to Sell336 SHARES Liquidate manually upon vest to cover estimated federal & state gap
Net Shares Kept After Full Tax2140 / 3500 Retained value: $89,880
Total Gross Vest$147,0003500 shares @ $42/share
Brokerage Sell-to-Cover$42,9811024 shares liquidated automatically (29.24%)
True Federal Liability$46,446 Marginal 35.00% bracket on total comp $337,000
State Tax (IL)$7,277 Statutory withheld: $7,277 (4.95%)
2026 FICA Withholding$3,365 SS ($184.5k cap): $0 • Med: $3,365
Actual True Total Tax$57,087 Effective true tax rate: 38.83%

2026 Stripe Compensation Benchmarks in Illinois

Below is the 2026 tax withholding and April shortfall breakdown across sample Stripe engineering levels for a Single filer in Illinois (at a reference share price of $42/share via Carta / Morgan Stanley at Work):

Stripe in Illinois (IL) — 2026 Withholding vs. Actual Tax by Level
Level & Role Base + Annual Vest IL + Fed Withheld True Total Tax Net April Shortfall Extra Shares to Sell
L2
Software Engineer (L2)
$175,000 base
+$92,400 (2200 sh)
 $27,437 $33,045 $5,608 134 shares
L3
Senior Software Engineer (L3)
$205,000 base
+$159,600 (3800 sh)
 $46,763 $64,156 $17,394 415 shares
L4
Staff Software Engineer (L4)
$240,000 base
+$294,000 (7000 sh)
 $86,142 $123,290 $37,148 885 shares

Illinois Supplemental Tax Regulations for Stripe RSUs

Illinois constitutionally enforces a flat 4.95% individual income tax rate on net income, and employers withhold supplemental RSU vests at the exact 4.95% rate. While state withholding equals your true 4.95% Illinois marginal rate, Chicago tech workers still face the full 10% to 15% federal supplemental underwithholding spread.

Illinois Bracket Architecture: 4.95% flat state income tax rate; 0% local city wage tax in Chicago.

Illinois Safe Harbor & Estimated Tax Vouchers (Form IL-1040-ES (Estimated Income Tax Payments for Individuals))

Illinois Form IL-1040-ES quarterly payments are required if unpaid Illinois tax exceeds $1,000 (safe harbor: 90% of current-year tax or 100% of prior-year Illinois tax liability).

Multi-State Relocation & Nonresident Sourcing Rules in Illinois

Under 35 ILCS 5/302, compensation from stock options and RSUs is allocated to Illinois to the extent earned for services performed within Illinois between the grant date and vest date.

Employer Stock Plan Specifics: Stripe (Carta / Morgan Stanley at Work)

Stripe has pioneered ongoing employee liquidity for a late-stage private company by waiving liquidity triggers on specific RSU cohorts and executing regular company-sponsored tender offers to cover tax obligations and provide secondary liquidity. However, when Stripe net-settles shares at vest or executes a tender offer, payroll withholding still defaults to the 22% federal statutory rate—leaving a 10% to 15% cash tax gap on illiquid private equity.

Withholding Election Guidance: Unlike public company employees who can log into Schwab or Fidelity any day and sell extra shares on the open market to pay the IRS in April, Stripe employees hold private shares that cannot be traded outside designated tender offer windows. Therefore, when a tender offer window opens on Carta / Morgan Stanley at Work, you must sell enough secondary shares (or set aside cash from your base salary) to cover the 13%–15% federal and state underwithholding gap.

2026 Statutory Parameters Quick Reference

2026 Federal & Illinois Statutory RSU Tax Parameters (Private)
Statutory Parameter 2026 Rate / Rule
Federal Supplemental Withholding Rate 22.00% (≤ $1M) • 37.00% (> $1M)
Illinois Supplemental Withholding 4.95%
Illinois Top Marginal Tax Bracket 4.95%
Illinois Estimated Tax Voucher Form IL-1040-ES (Estimated Income Tax Payments for Individuals)
2026 Social Security Limit $184,500 (6.2% FICA Cap)
Medicare & Additional Medicare 1.45% Uncapped + 0.9% over $200k/$250k
Stripe Stock Plan Brokerage Carta / Morgan Stanley at Work

Other States for Stripe (Private)