Washington, Massachusetts, Colorado, Louisiana, Iowa, Idaho & Delaware Capital Gains Tax Calculator
Combines federal long-term rates with Washington’s 7.00% state treatment.
Washington, Massachusetts, Colorado, Louisiana, Iowa, Idaho, Delaware share this page.
Their rules produce the same answer to within a rounding difference, so publishing
separate near-identical pages would add URLs without adding information. Every figure
below applies to all 7 states.
Washington capital gains estimator
Combines federal long-term rates with Washington’s 7.00% state treatment.
Total tax on the gain —
Federal —
Washington state —
Net investment income tax —
You keep —
Washington at a glance
| Figure | Washington | Source |
|---|---|---|
| State capital gains rate | 7.00% | [1] |
| State top marginal rate | No income tax | [1] |
| Federal long-term rates | 0% / 15% / 20% | [2] |
| Net investment income tax | 3.8% above $200,000 | [2] |
Washington highlighted. Same data as the table below, shown as a distribution so the comparison is visible at a glance.
Highlighted: Washington, ranked 11 of 50. Median 4.55%.
Washington tax by gain size and other income
Total tax (federal + Washington + NIIT) on a long-term gain.
| Capital gain | $40,000 income | $60,000 income | $80,000 income | $100,000 income | $150,000 income | $200,000 income | $300,000 income | $500,000 income |
|---|---|---|---|---|---|---|---|---|
| $10,000 | $948 | $2,200 | $2,200 | $2,200 | $2,200 | $2,580 | $2,580 | $2,580 |
| $20,000 | $3,148 | $4,400 | $4,400 | $4,400 | $4,400 | $5,160 | $5,160 | $5,160 |
| $30,000 | $5,348 | $6,600 | $6,600 | $6,600 | $6,600 | $7,740 | $7,740 | $7,740 |
| $40,000 | $7,548 | $8,800 | $8,800 | $8,800 | $8,800 | $10,320 | $10,320 | $10,650 |
| $50,000 | $9,748 | $11,000 | $11,000 | $11,000 | $11,000 | $12,900 | $12,900 | $13,730 |
| $65,000 | $13,048 | $14,300 | $14,300 | $14,300 | $14,870 | $16,770 | $16,770 | $18,350 |
| $80,000 | $16,348 | $17,600 | $17,600 | $17,600 | $18,740 | $20,640 | $20,640 | $22,970 |
| $100,000 | $20,748 | $22,000 | $22,000 | $22,000 | $23,900 | $25,800 | $25,800 | $29,130 |
| $125,000 | $26,248 | $27,500 | $27,690 | $28,450 | $30,350 | $32,250 | $32,250 | $36,830 |
| $150,000 | $31,748 | $33,380 | $34,140 | $34,900 | $36,800 | $38,700 | $38,700 | $44,530 |
| $200,000 | $44,268 | $46,280 | $47,040 | $47,800 | $49,700 | $51,600 | $51,600 | $59,930 |
| $250,000 | $57,168 | $59,180 | $59,940 | $60,700 | $62,600 | $64,500 | $65,330 | $75,330 |
| $350,000 | $82,968 | $84,980 | $85,740 | $86,500 | $88,400 | $91,130 | $96,130 | $106,130 |
| $500,000 | $121,998 | $125,010 | $126,770 | $128,530 | $132,930 | $137,330 | $142,330 | $152,330 |
| $650,000 | $168,198 | $171,210 | $172,970 | $174,730 | $179,130 | $183,530 | $188,530 | $198,530 |
| $800,000 | $214,398 | $217,410 | $219,170 | $220,930 | $225,330 | $229,730 | $234,730 | $244,730 |
| $1,000,000 | $275,998 | $279,010 | $280,770 | $282,530 | $286,930 | $291,330 | $296,330 | $306,330 |
| $1,500,000 | $429,998 | $433,010 | $434,770 | $436,530 | $440,930 | $445,330 | $450,330 | $460,330 |
Worked figures for Washington
Washington values:
| Gain | Federal | State | Niit | Total | Effective |
|---|---|---|---|---|---|
| $25,000 | $3,750 | $1,750 | $0 | $5,500 | 22.00% |
| $50,000 | $7,500 | $3,500 | $0 | $11,000 | 22.00% |
| $75,000 | $11,250 | $5,250 | $0 | $16,500 | 22.00% |
| $100,000 | $15,000 | $7,000 | $0 | $22,000 | 22.00% |
| $150,000 | $22,500 | $10,500 | $1,900 | $34,900 | 23.27% |
| $200,000 | $30,000 | $14,000 | $3,800 | $47,800 | 23.90% |
| $300,000 | $45,000 | $21,000 | $7,600 | $73,600 | 24.53% |
| $500,000 | $78,330 | $35,000 | $15,200 | $128,530 | 25.71% |
| $750,000 | $128,330 | $52,500 | $24,700 | $205,530 | 27.40% |
| $1,000,000 | $178,330 | $70,000 | $34,200 | $282,530 | 28.25% |
How Washington compares nationally
On state capital gains rate, Washington ranks #11 of 50 at 7.00% — 54% above the median of 4.55%. The national range runs from 0.00% (Wyoming) to 13.30% (California).
| Rank | State | State capital gains rate |
|---|---|---|
| #9 | Hawaii | 7.25% |
| #10 | Maine | 7.15% |
| #11 | Washington | 7.00% |
| #12 | Connecticut | 6.99% |
| #13 | Delaware | 6.60% |
Flat state rate on gainss, ranked
Same rule structure as Washington:
| State | State capital gains rate | vs Washington |
|---|---|---|
| Washington | 7.00% | — |
| Illinois | 4.95% | -29.3% |
| North Carolina | 3.99% | -43.0% |
| Ohio | 3.50% | -50.0% |
| Pennsylvania | 3.07% | -56.1% |
Washington questions, answered with Washington numbers
Does Washington tax capital gains?▾
Yes. Washington applies 7.00% to capital gains. On a $100,000 long-term gain that is $7,000 in state tax, on top of $15,000 federal.
What would I owe on a $500,000 gain in Washington?▾
About $128,530 total — $78,330 federal, $35,000 to Washington, and $15,200 net investment income tax. You would keep roughly $371,470, an effective rate of 25.71%.
How does Washington compare with a no-tax state?▾
Realising a $500,000 gain in Washington costs $35,000 more than realising it in a state with no capital gains tax, such as Florida or Texas.
Other flat state rate on gainss
Last reviewed 2026-08-27. Washington figures only — verify with the relevant Washington agency before acting. How this is calculated.