Most people find out their RSU withholding fell short in April, when the tax bill arrives. By then, the vest, the trading window, and the year-end deadlines that could have fixed it have all passed.
RSU tax planning that starts the week shares vest is already behind. Build a forecast early in the year and be prepared for each vesting date.
How to build your annual RSU tax projection
Start with one projection for the whole year, then break it down by vest. Looking at each vest on its own tends to understate what you will owe.
Map, model, and estimate your RSU income
- Map your vesting for the year across all grants, including promotion and refresh grants that vest on their own schedules.
- Model three price scenarios for each vesting date: a lower price, the current price, and a higher price. The tax bill moves with the stock.
- Estimate the income from each vest by multiplying expected units by each price scenario. That gives you three income estimates per vest. The value of the shares at vesting counts as compensation income and shows up on your W-2.
The RSU tax calculator can help you run these scenarios for a single vest.
Combine RSU income with the household’s complete financial picture
Add your RSU estimates to salary, bonus, a spouse’s income, option exercises, and any other income expected this year. A vest that looks manageable next to your salary alone can push the household into a higher bracket once everything else is counted.
When should you update your RSU tax projection?
Revisit the projection on a set schedule, and any time something significant changes.
Before every quarterly vest
Two to four weeks before each major vest, check the unit count, the current stock price, the projected compensation value, and your employer’s withholding method. Then compare the updated number with your original projection.
During a midyear tax review
June or July is a natural checkpoint. Compare actual RSU income against the original forecast, actual stock prices against your modeled scenarios, actual withholding against your projected liability, and any realized gains or losses so far.
After any material financial event
A promotion, a bonus change, a spouse’s job change, or a property sale can each change the year’s income enough to update the projection right away.
Before December 31st
Start the final review early enough to leave room for payroll cutoffs, trading windows, brokerage processing times, and charitable-transfer timelines. By the last week of December, some of these options may already be closed.
Which RSU tax decisions need to happen before December 31st?
Income events: is the household’s projected income complete?
Check actual salary, bonuses, completed RSU vests, any RSU vests still scheduled before year-end, a spouse’s income, option exercises, and anything else material. Compare the total against what you assumed earlier in the year. A bonus or a late-year grant can change the picture.
Investment decisions: which transactions should be completed, delayed, or coordinated?
Review realized gains and losses, property sales, sales of employer or former-employer stock, any planned concentrated-stock diversification, remaining planned RSU sales, capital-loss harvesting opportunities, and which tax lots you’d sell if you decide to sell.
Contribution and giving deadlines: which opportunities expire at year-end?
Workplace retirement contributions, charitable giving, gifts of appreciated stock, and donor-advised fund contributions where relevant, all run on deadlines that don’t move for your schedule. Check employer-plan cutoffs and brokerage or charity transfer deadlines too. Some of these need days to process.
Payment and withholding adjustments: is enough cash available to cover the projected liability?
Calculate total year-to-date withholding and compare it to your projected tax for the year. Compare that against the cash you have on hand, and anything else competing for that same cash.
Employers commonly withhold on RSU income at the flat 22% supplemental rate, or 37% on supplemental wages above $1 million (IRS Publication 15), and why RSUs are taxed so high explains where the gap comes from. Quarterly estimated payments or higher W-4 withholding can close it (IRS Publication 505).
How Nino closes the gap in proactive RSU tax planning
Nino is a coordinated financial-planning and tax team working from the same household picture all year. We see your full financial picture, including every RSU grant, your household’s income, and your withholding to date, and plan ahead of each vest to help you avoid surprises at tax time.
Ask whoever handles your finances today one question: who owns your RSU plan between now and your next vest, not just at tax time?
Book a free consultation before your next vest.