About
A desk, not a firm.
Last reviewed August 21, 2026.
Vestgap exists because payroll is allowed to withhold 22% federal tax on RSUs while the person is already in 32 or 35. We compute that gap for 2026 and give you a 1040-ES or W-4 slip to copy. We do not sign returns. The 1040-ES and W-4 slips are free. A $49 letter pack issues CPA emails on this device after the first free one.
Experience
The Bay Area, New York, and Austin samples are worked examples using the same function as the desk — not hypothetical marketing math. Open the desk, load a sample, and you should see the same still-due figure the guides cite.
Expertise
Brackets, the 22%/37% supplemental rates, additional Medicare, and simplified state add-ons are TypeScript. The letter may not invent dollar amounts. Method lists what is in and what is out.
Trust
Vestgap is not a CPA, EA, attorney, or CFP. We are not your tax preparer. If a number here disagrees with software your CPA runs, theirs wins. We do not store W-2s on a server; briefings on this device stay in the browser.
Sources
- IRS Publication 15 (Circular E) — Supplemental wage withholding: 22% up to $1 million, 37% above.
- IRS tax year 2026 inflation adjustments (Rev. Proc. 2025-32) — 2026 federal brackets and standard deduction.
- IRS estimated taxes — 1040-ES installment dates and underpayment penalty.