RSUs feel like free money until the tax bill arrives. For most tech executives, the withholding at vest covers federal taxes at a flat 22% — which sounds reasonable until you realize your actual marginal rate is significantly higher. That gap doesn’t go away. It just shows up in April as a balance due that nobody planned for.
The fix isn’t complicated, but it requires looking at the vesting schedule in advance. Supplemental withholding can be adjusted. Estimated payments can be made. Deductions and losses in the same tax year can offset the income. None of that is possible after the fact. The window to act is always before the vest, not after.
RSU planning also intersects with concentration risk, portfolio strategy, and long-term wealth decisions in ways that make it one of the highest-leverage areas of financial planning for anyone in tech. A thoughtful plan built around the vesting schedule can meaningfully change both the tax outcome and the long-term portfolio picture.
The Withholding Gap Nobody Warns You About
When RSUs vest, your employer withholds taxes automatically. The default federal withholding rate on supplemental income is 22%. For most tech executives earning $300K, $500K, or more in total compensation, the actual marginal federal rate is 32% or 37%. That’s a gap of 10 to 15 percentage points on every vest — and it compounds across multiple vesting events throughout the year.
What This Looks Like in Practice
- RSUs vest and shares are deposited net of withholding
- The withholding looks adequate on the vest confirmation
- No estimated payments are made because it looks covered
- April arrives with a five-figure balance due that nobody budgeted for
- The cycle repeats at the next vest because nothing changed
This isn’t a rare scenario. It’s the default outcome for anyone whose total compensation puts them in the top two federal brackets and who hasn’t specifically addressed the withholding gap.
The Window to Act Is Before the Vest
The most important thing to understand about RSU tax planning is that the income is recognized at vest — not at sale. The moment the shares land in your account, the tax consequence is already set. What you do with the shares after that point is a separate decision with its own tax implications, but the ordinary income tax on the vest itself is already determined.
What Can Actually Be Done Before a Vest
- Adjust supplemental withholding — request a higher withholding rate from your employer before the vest date
- Make estimated tax payments — cover the anticipated gap before the quarterly deadline
- Identify offsets in the same tax year — deductions, losses, or other strategies that reduce taxable income in the year the vest lands
- Coordinate with a CPA — ensure the personal tax return accounts for the vest correctly and that nothing is missed
None of these options exist after the vest. The planning window is in the months — ideally quarters — before each vesting event on the schedule.
The Concentration Problem That Builds Quietly
The tax bill is the most visible problem with unmanaged RSUs. The concentration risk is the one that builds in the background without anyone noticing until it’s significant.
How It Happens
Every vest adds shares. Some get sold to cover taxes. The rest sit. Year after year, the position in a single employer’s stock grows — not because of a deliberate decision to hold, but because of inertia. There was no formal plan for how much concentration was acceptable, at what threshold to diversify, or how to manage the tax cost of doing so.
By the time the concentration is obvious, unwinding it has become an expensive tax conversation. The shares have appreciated. Selling means realizing capital gains on top of the ordinary income already recognized at vest. The cost of diversification is real — but so is the cost of staying concentrated in a single employer’s performance.
The Right Questions to Ask
- How much of your net worth is currently tied to a single employer?
- At what threshold does the concentration become a risk you’re deliberately choosing versus one you’ve drifted into?
- What’s the tax cost of diversifying over one year versus three?
- How does the concentration interact with the rest of the investment portfolio?
These questions don’t have universal answers. They have answers that are specific to your vesting schedule, your tax situation, your timeline, and your broader financial goals.
RSUs Are Not Just a Tax Problem
The tax planning is urgent and specific. But RSUs also sit at the intersection of several other financial decisions that don’t get enough attention.
Portfolio Strategy
The shares that vest are an investment position whether you think of them that way or not. How they fit into the overall portfolio — in terms of sector exposure, concentration, and risk — is a portfolio question that most people never formally answer. The default is to hold everything or sell everything, neither of which is a strategy.
Long-Term Wealth Decisions
For many tech executives, RSUs represent a significant portion of total compensation over a multi-year period. The decisions made around each vest — how much to sell, when to sell, how to invest the proceeds, how to manage the tax cost — compound over time into outcomes that are meaningfully different depending on whether there was a plan or not.
A vesting schedule is a roadmap. Treated as one, it becomes one of the most powerful planning tools available to anyone in tech.
What a Plan Actually Looks Like
RSU planning isn’t a one-time conversation. It’s an ongoing process built around the vesting schedule:
- Review the upcoming vesting events at the start of each year
- Identify the tax consequence of each vest given current income projections
- Determine whether withholding adjustments or estimated payments are needed
- Evaluate the concentration level and whether diversification makes sense
- Coordinate the sell or hold decision with the broader portfolio and tax strategy
- Revisit after each vest and adjust for the next one
Done consistently, this process changes both the tax outcome and the long-term portfolio picture in ways that a reactive approach never will. The vest is coming regardless. The only variable is whether you’re ready for it.
