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Commission income creates tax complexity most financial content ignores. Employers withhold commissions at a flat 22% via supplemental wage rules -- but depending on your income, your actual rate is higher. Add state taxes, capital gains from equity comp, and potential AMT, and taxes become a significant planning variable.
Key Concepts
The IRS rule that allows employers to withhold commissions at a flat 22% federal rate instead of using your W-4 elections. This rate undershoots for most reps earning over $100K total, creating a gap between what was withheld and what is actually owed.
A parallel tax calculation that limits certain deductions. It most commonly hits sales reps who exercise incentive stock options, because the spread between the exercise price and the stock's fair market value counts as income under AMT rules -- even if you haven't sold the shares.
A dedicated savings account that holds the estimated underpayment from supplemental withholding. Standard practice is to hold an additional 8 to 12% of each commission deposit here, separate from your checking or operating accounts.
For equity comp, the difference between short-term and long-term capital gains rates can be significant. Long-term rates apply when you hold shares for more than 12 months. For ISOs, the qualifying disposition rules require holding the shares for at least 2 years from grant and 1 year from exercise.
Articles on This Topic
Covers the supplemental wage withholding gap and how to calculate the right tax reserve buffer for your actual income and marginal rate.
Tax treatment and timing comparison. RSUs are taxed as income at vest. ISOs are taxed differently at exercise and sale -- and AMT changes the math entirely.
AMT, timing strategy, and pre-IPO considerations. When you exercise ISOs determines how much you owe -- and when.
Common Questions
The IRS classifies commissions as supplemental wages and allows employers to withhold at a flat 22% federal rate. For sales reps whose total income puts them in the 24%, 32%, or higher tax bracket, that 22% is too low. The gap compounds with every commission deposit throughout the year.
The Alternative Minimum Tax is a parallel tax system that recalculates your liability using fewer deductions. It most commonly affects sales reps when they exercise incentive stock options. The spread between the exercise price and the fair market value of the stock counts as an AMT preference item -- which can create a significant tax bill even if you haven't sold any shares or received any cash.
Set aside an additional 8 to 12% of each commission deposit into a dedicated high-yield savings account the day it arrives. This covers the gap between supplemental withholding and your actual rate. For reps with equity comp, the calculation is more complex and often requires a separate estimate around exercise events.
The same day the income arrives. Waiting until January to figure out your tax position gives you no options. Holding the buffer in a separate high-yield savings account -- not your checking account -- ensures it doesn't get spent before the bill comes due.
RSUs are taxed as ordinary income when they vest. You owe tax on the full value of the shares at vest, whether you sell or hold. ISOs are taxed differently: no income tax at exercise (though AMT may apply), and potentially long-term capital gains rates at sale if you meet the holding period requirements. ISOs are more complex but can produce better tax outcomes when handled correctly.
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