Illinois Supplemental Tax Regulations for Databricks RSUs
Illinois applies a flat 4.95% individual income tax rate with matching 4.95% supplemental withholding.
Illinois Safe Harbor & Underpayment Penalties
IL-1040-ES safe-harbor required if unpaid tax exceeds $1,000.
Employer Stock Plan Specifics: Carta / Shareworks
Databricks pre-IPO equity compensation involves RSUs that trigger tax upon liquidity events or structured tender offers. Knowing your exact supplemental gap ensures you reserve adequate cash when participating in company-sponsored secondary sales.
When vesting at Databricks, Carta / Shareworks calculates automatic sell-to-cover withholding using Illinois's statutory supplemental rate of 4.95% combined with the federal supplemental rate (22% on up to $1M). Because top earners in Illinois reach marginal brackets exceeding these rates, you will face an incremental shortfall on April 15.
Localized CPA & Advisory Referral
Advisor Guidance: Work with a Chicago CPA to coordinate Illinois IL-1040-ES payments for large technology RSU vests.