RSU $15,000
$9,982.50
State $570 · Total withheld $5,017.50
All states
2026Rank #33
2026Rank #33Iowa RSU Tax 2026
3.8% — $1,900 state withholding, $34,236 net on $50,000 RSU vest (100 shares × $500 FMV) with $150,000 other annual income (flat supplemental method).
By Sammy S. · Founder · AuthorUpdated for 2026
3.8%
Rate
$1,900
State tax
$15,764
Total withheld
#33
National rank
Iowa RSU withholding at a glance
Supplemental rate
3.8%
State tax (vignette)
$1,900
Total withheld
$15,764
Net RSU
$34,236
Published state supplemental withholding at 3.8% on RSUs and other supplemental wages. Rank #33 on $50,000 RSU vest (100 shares × $500 FMV) with $150,000 other annual income (flat supplemental method). Federal $11,000 + FICA $2,864 on this vignette.
Key takeaways — Iowa RSU tax
- Iowa ranks #33 at 3.8% (~$1,900 state tax on $50,000 RSU vest (100 shares × $500 FMV) with $150,000 other annual income (flat supplemental method)).
- Total vignette withholding ~$15,764 (federal $11,000 + FICA $2,864 + state $1,900); net ~$34,236.
- Published state supplemental withholding at 3.8% on RSUs and other supplemental wages.
- Federal flat supplemental remains 22% regardless of state (IRS Pub. 15).
- Model custom amounts at /rsu-tax-calculator.
Iowa vs similar supplemental rates
States with supplemental rates closest to Iowa (3.8%). Iowa: $1,900 state tax on the vignette.
| State | Rate | State tax | vs IA | Compare |
|---|---|---|---|---|
| Iowa | 3.8% | $1,900 | — | This page |
 Arkansas | 3.7% | $1,850 | -$50 | vs IA |
 Mississippi | 4% | $2,000 | +$100 | vs IA |
 North Carolina | 4.09% | $2,045 | +$145 | vs IA |
 Kentucky | 3.5% | $1,750 | -$150 | vs IA |
Modeled Iowa RSU stub ($50,000 RSU vest (100 shares × $500 FMV) with $150,000 other annual income (flat supplemental method))
Line amounts are calculated from our engine — the same engine as the RSU tax calculator. Not a substitute for your employer’s stub.
| Line | Amount | Note |
|---|---|---|
| Federal income tax (supplemental) | $11,000 | 22% flat (Pub. 15) on this vignette |
| FICA (SS + Medicare) | $2,864 | 6.2% SS + 1.45% Medicare (Additional Medicare if over $200k YTD) |
| IA state tax | $1,900 | 3.8% |
| Net RSU | $34,236 | After $15,764 total withheld |
Iowa withholding at different RSU sizes
Same $150,000 other annual income; flat supplemental method. State rate 3.8%.
RSU $50,000
$34,236
State $1,900 · Total withheld $15,764
RSU $100,000
$70,161
State $3,800 · Total withheld $29,839
RSU $250,000
$177,936
State $9,500 · Total withheld $72,064
How to read this page
Iowa RSU / supplemental withholding in 2026
Published state supplemental withholding at 3.8% on RSUs and other supplemental wages.
On $50,000 with $150,000 other annual income, modeled state withholding is $1,900 and after-tax share value is about $34,236.
Compared with New York ($5,850 state) and Texas ($0 state) on the same vignette, Iowa sits at rank #33.
Iowa published flat supplemental rate
Iowa’s employer withholding guidance supports a flat supplemental rate of about 3.8% when RSU vests are paid separately.
On the vignette that is $1,900 of state tax before federal and FICA.
Employers may still elect the aggregate method under federal and state rules.
How Iowa payroll usually handles RSU vests
When the RSU vest is paid separately, many employers apply 3.8% state rules plus federal 22% and FICA.
If the RSU vest is combined with regular wages, withholding may follow the aggregate method instead of these flat percentages (IRS Pub. 15 §7).
Employees should reconcile annual liability on Form 1040 — paycheck withholding is only an estimate.
How withholding scales with RSU size
At a constant rate, state tax scales roughly linearly: double the RSU vest and state withholding roughly doubles (before exemptions or method changes).
Above $1M supplemental wages in a year with one employer, federal withholding jumps to 37% on the excess (Pub. 15).
What this profile does not include
Local city or municipal wage taxes (for example NYC resident tax, Philadelphia wage tax, Ohio city income tax) are not in these figures.
California SDI, state disability, paid family leave premiums, and local school taxes are outside the supplemental income-tax line.
Confirm current employer guides linked in the sources section before relying on a stub estimate.
Who this Iowa RSU page helps
Useful if…
- •Iowa employees reading an RSU vest stub
- •Candidates comparing Iowa offers to other states
- •Payroll teams verifying IA supplemental setup
Use official tools if…
- •City or local wage taxes not listed here
- •Signing RSU vests paid with the first regular paycheck (aggregate method)
- •Year-end true-up if under-withheld at 22% federal
Iowa RSU withholding checklist
Quick steps before relying on this vignette for payroll decisions.
- 1Confirm Iowa’s current supplemental rule with the state tax agency.
- 2Ask payroll which withholding method they use for RSU vests.
- 3Check federal, FICA, and state lines separately on the stub.
- 4Run scenarios at /rsu-tax-calculator.
- 5Plan estimated payments if your marginal bracket exceeds 22%.
Iowa RSU withholding ladder
| RSU | State tax | Total withheld | Net |
|---|---|---|---|
| $15,000 | $570 | $5,017.50 | $9,982.50 |
| $50,000 | $1,900 | $15,764 | $34,236 |
| $100,000 | $3,800 | $29,839 | $70,161 |
| $250,000 | $9,500 | $72,064 | $177,936 |
Compare Iowa with another state
Compare any two states
Supplemental RSU withholding on a $50,000 vest (100×$500) with $150,000 other income.
Related states
Iowa RSU tax FAQs
Iowa uses about 3.8% for flat supplemental withholding in our model (~$1,900 on $50,000 RSU vest (100 shares × $500 FMV) with $150,000 other annual income (flat supplemental method)).
On the vignette ($50,000 vest, $150,000 other income): about $15,764 total withheld ($11,000 federal + $2,864 FICA + $1,900 state), leaving ~$34,236 after-tax share value (~68.47 net shares after sell-to-cover).
Supplemental flat rates are a payroll shortcut when RSU income is withheld separately. Employers may instead use the aggregate method (combine with regular wages). Confirm with payroll and your state withholding tables.
Usually no under the flat supplemental method — both are supplemental wages. Timing and whether pay is combined with regular wages can change the stub via the aggregate method.
State income tax withheld may be itemized on Schedule A subject to the federal SALT cap. Whether you benefit depends on your full return.
About $11,000 (22% flat), the same as in every other state on this vignette — plus about $2,864 FICA.
Related topics
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Federal, state, and FICA take-home
Equity vesting calculator
Schedule vesting across grants
State tax compare
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