RSU tax planning tactics
- Certified planners shared RSU tax pitfalls and practical fixes from real client cases in tech compensation. - Key tactic: use base salary and cash bonuses to make quarterly estimated tax payments when RSU withholding falls short. - Those moves aim to prevent surprise tax bills and penalties for concentrated RSU income, per adviser posts. (x.com) (x.com)
Restricted stock units are taxed like wages when they vest, but many tech employees still come up short because federal withholding on supplemental pay is often 22%, not their actual tax rate. (irs.gov) The Internal Revenue Service says supplemental wages are generally withheld at 22%, rising to 37% only after an employee’s supplemental wages top $1 million in a calendar year. Form 1040-ES says estimated payments are usually required when a taxpayer expects to owe at least $1,000 after withholding and credits. (irs.gov 1) (irs.gov 2) That gap is the planning problem advisers were flagging in recent posts about real client cases: a worker in a 32% or 35% marginal bracket can have RSUs taxed as income at vesting while payroll withholds at a lower flat rate. Publication 505 says federal tax is pay-as-you-go, through withholding or estimated payments, and penalties can apply if too little is paid during the year. (irs.gov) (x.com 1) (x.com 2) Brokerage guides used by employees at large public companies describe the same mechanics. Fidelity says equity compensation becomes ordinary income in the year an award vests or shares are delivered, and the employer withholds ordinary income and payroll taxes at that point. (fidelity.com) Charles Schwab says restricted stock units create one tax event at vesting and another when the shares are later sold, with any post-vesting move treated as capital gain or loss. Schwab also notes some plans have a delivery lag, so the fair market value on the delivery date can set the taxable income. (schwab.com) The practical fix advisers described is to treat RSU income as a known tax bill early, then use base salary, cash bonuses, or both to fund quarterly estimated payments instead of waiting until April. Form 1040-ES says the usual benchmark is to cover the smaller of 90% of current-year tax or 100% of the prior year’s tax, with special rules for higher-income taxpayers. (x.com) (irs.gov) For 2026, the IRS package for Form 1040-ES lists four payment windows tied to income earned during the year, and missing them can still trigger underpayment penalties even if the full balance is paid with the return later. Publication 505 describes those estimated payments as the backstop when withholding is not enough. (irs.gov 1) (irs.gov 2) The thread running through the adviser examples is simple: sell-to-cover withholding is a payroll convenience, not a guarantee that the tax bill is fully covered. When RSUs make up a large share of annual compensation, the safest assumption is that vesting changes taxable income immediately, not just when the stock is sold. (fidelity.com) (schwab.com)
