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HEAD-TO-HEAD TAX COMPARISON · 2026

COUNTRY A Washington VS COUNTRY B South Dakota

Side-by-side analysis of income tax, effective rates, and take-home pay for Washington and South Dakota in 2026.

Daniel · CountryTaxCalc Updated June 2026 Tax Comparison 2026
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OVERVIEW
Washington and South Dakota both have no personal income tax on wages — but their investment and estate tax regimes are direct opposites. Washington added a 7% capital gains tax in 2022 on net long-term gains above approximately $278,000, and has a 10–20% estate tax on taxable estates above $3 million. South Dakota has zero capital gains tax and zero estate tax on any amount. South Dakota is also the nation's premier dynasty trust jurisdiction: no rule against perpetuities, zero state income tax on trust income, and an estimated $600+ billion in trust assets administered under South Dakota law. For wage earners without capital gains, Washington and South Dakota have very similar total tax burdens — Washington's lower property tax (0.85% vs SD's 1.14%) is largely offset by its higher sales tax (~9% vs SD's 6.4%). At $100,000 income with a $400,000 home: Washington totals approximately $7,000 versus South Dakota's approximately $7,120 — effectively equal. The comparison is entirely decided by capital gains and estate planning: investors with gains above $278,000, business owners selling companies, and high-net-worth families with estate planning needs all benefit significantly from South Dakota residency over Washington.
Section 01

The Big Picture

Top-line rates and effective take-home for a typical earner — including income tax, social contributions, and applicable surcharges.
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COUNTRY A
Washington
TAX RATE
0%
No Income Tax — But 7%/9.9% CGT + Estate Tax
No personal income tax; 7% capital gains tax on gains above ~$278K threshold; estate tax 10–20% on estates above $3M; property tax ~0.85%; high sales tax ~9–10.4% combined
🌾
COUNTRY B
South Dakota
TAX RATE
0%
No Income Tax — No CGT, Trust Law Capital of the US
No income tax (constitutional prohibition); 4.5% state sales tax (~6.4% combined); property tax ~1.14%; no capital gains tax; no estate tax; nation-leading dynasty trust laws (no rule against perpetuities)
TYPICAL ANNUAL DIFFERENCE
Moving from South Dakota → Washington at $300K wage + $400K capital gain — SD advantage from zero CGT
$8,540+
That's Equal for wages only; SD saves $711/month on a $400K capital gain event back in your pocket
Section 02

Tax Savings by Income Level

Net take-home after all income tax, social contributions, and surcharges — for a single employee with no dependents.
GROSS INCOME
🌲 WA TAX
🌾 SD TAX
SAVINGS
10-YEAR
$75K wage — no capital gains
$0 income tax; ~$2,550 property (0.85% × $300K home); ~$2,700 sales (9% × $30K) = ~$5,250 total
$0 income tax; ~$3,420 property (1.14% × $300K home); ~$1,920 sales (6.4% × $30K) = ~$5,340 total
WA saves ~$90/year — effectively equal
$900
$100K wage — no capital gains
$0 income tax; ~$3,400 property (0.85% × $400K home); ~$3,600 sales (9% × $40K) = ~$7,000 total
$0 income tax; ~$4,560 property (1.14% × $400K home); ~$2,560 sales (6.4% × $40K) = ~$7,120 total
WA saves ~$120/year — essentially equal
$1,200
$150K wage — no capital gains
$0 income tax; ~$4,250 property (0.85% × $500K home); ~$5,400 sales (9% × $60K) = ~$9,650 total
$0 income tax; ~$5,700 property (1.14% × $500K home); ~$3,840 sales (6.4% × $60K) = ~$9,540 total
SD saves ~$110/year at higher income — essentially equal
$1,100
$300K wage + $400K long-term capital gains
$0 income tax; ~$8,540 CGT (7% × $122K above $278K threshold); ~$4,250 property; ~$8,100 sales = ~$20,890 total
$0 income tax; $0 CGT; ~$5,700 property; ~$4,800 sales = ~$10,500 total
SD saves ~$10,390 due to zero CGT
$103,900
$5M estate (at death)
WA estate tax: ~$210,000–$280,000 on $2M taxable estate ($5M − $3M exemption) at 10–14% rates
SD estate tax: $0; dynasty trust can hold assets indefinitely; no rule against perpetuities
SD saves $210,000–$280,000 per estate event plus ongoing generational trust advantages
One-time at death + generational compound advantage through dynasty trust
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🌲

Washington Pros & Cons

+ PROS
  • World-class tech economy and high wages: Washington is home to Amazon, Microsoft, Boeing, and hundreds of high-growth tech companies — with median engineering salaries exceeding $200,000. For workers in Washington's tech corridor, the higher earnings potential often justifies the CGT burden. South Dakota's largest city (Sioux Falls, ~200,000) cannot replicate this economic opportunity.
  • Mild climate in Puget Sound region: Seattle averages only 5 inches of snow and rarely sees temperatures below 20°F. Washington's Pacific Northwest climate is dramatically more temperate than South Dakota's continental extremes (Sioux Falls averages 41 inches of snow, temperatures regularly drop below −20°F).
  • No income tax on wages: Washington's 7% CGT applies only to long-term capital gains above ~$278,000 — not to wages, salaries, or ordinary income. Most Washington workers owe zero state income or capital gains tax on their earnings.
  • Lower property tax than South Dakota: Washington's ~0.85% rate is below South Dakota's ~1.14%. On a $400,000 home: Washington ~$3,400/year versus South Dakota ~$4,560/year — $1,160/year less in Washington for wage earners.
− CONS
  • 7% capital gains tax on gains above ~$278K: Washington's CGT directly affects tech workers with RSUs, business owners selling companies, and investors liquidating portfolios. A $1 million gain above the threshold: $722,000 × 7% = $50,540 in Washington state tax versus $0 in South Dakota. Over a career of RSU vesting and portfolio growth, the cumulative CGT can reach six figures.
  • 10–20% estate tax on estates above $3M: Washington's estate tax catches many Seattle homeowners with appreciated real estate — a $5 million estate owes approximately $210,000–$280,000. South Dakota has no estate tax and leads the US in dynasty trust law for multi-generational wealth transfer.
  • Higher combined sales tax (~9–10.4%): Washington's combined sales tax significantly exceeds South Dakota's ~6.4%. On $60,000 annual spending: Washington ~$5,400 versus South Dakota ~$3,840 — $1,560/year more in Washington.
  • High cost of living: Seattle-area housing costs rank among the highest in the US — partially eroding the income advantage for non-tech professionals.
🌾

South Dakota Pros & Cons

+ PROS
  • No capital gains tax on anything: South Dakota has never had a state capital gains tax. All gains from stocks, business sales, real estate, and cryptocurrency are completely state-tax-free. For investors with large gains, South Dakota is categorically better than Washington on this single dimension.
  • No estate tax — and nation-leading trust law: South Dakota's zero estate tax is matched by the nation's premier dynasty trust infrastructure: no rule against perpetuities (trusts last indefinitely vs Washington's estate tax applying at death), zero state income and capital gains tax on trust income, strong directed trust statutes, and robust privacy. Over $600 billion in trust assets are administered in South Dakota.
  • Lower combined sales tax (~6.4%): South Dakota's combined rate saves approximately $1,560/year versus Washington for a household spending $60,000 on taxable goods.
  • Lower cost of living: South Dakota's consumer prices are broadly at or below national averages — dramatically less than Seattle's elevated costs. The net financial picture for non-tech residents often favours South Dakota over Washington.
− CONS
  • Higher property tax than Washington: South Dakota's ~1.14% rate exceeds Washington's ~0.85%. On a $400,000 home: South Dakota ~$4,560/year versus Washington ~$3,400/year — $1,160/year more in South Dakota. This is the only regular tax where Washington beats South Dakota.
  • Small economy with limited career opportunities: South Dakota's population (~885,000) and economy are a fraction of Washington's. Career opportunities outside of financial services, healthcare, and agriculture are significantly more limited.
  • Harsh winters: South Dakota winters are severe. Sioux Falls averages 41 inches of snow and temperatures regularly fall below −20°F — a significant lifestyle trade-off versus Washington's mild Puget Sound climate.
  • High sales tax on groceries: South Dakota taxes groceries at the full 4.5% state rate. Washington does not tax unprepared groceries. On a $12,000/year family grocery budget, South Dakota collects approximately $540–900 in food taxes.
FAQ

Frequently Asked Questions

Which state is cheaper overall — Washington or South Dakota?

For wage earners without capital gains: essentially equal. At $100,000 income with a $400,000 home, the total tax burden is approximately $7,000 in Washington versus $7,120 in South Dakota — a negligible $120 annual difference. The comparison is decided by capital gains: investors with gains above $278,000 pay 7% in Washington and $0 in South Dakota. For business sales, RSU vesting, and investment liquidations, South Dakota is significantly cheaper.

Why is South Dakota used by tech executives leaving Washington?

Washington's 7% capital gains tax (enacted 2022) directly affects tech workers with large RSU grants, stock options, and business interests. By establishing genuine South Dakota residency (primary home, driver's licence, voter registration, 183+ days/year), future gains are free of state CGT. A $2 million RSU vesting event above the threshold triggers $120,540 in Washington state tax versus $0 in South Dakota. South Dakota's trust laws also allow these individuals to establish dynasty trusts for multi-generational wealth transfer.

What is Washington's capital gains tax threshold?

Washington's CGT threshold was approximately $278,000 in 2024, adjusted annually for inflation (the exact 2026 threshold is set by the Washington Department of Revenue). Net long-term capital gains below this threshold are not taxed. Gains above the threshold are taxed at 7%. Real estate gains are explicitly exempt. Retirement account withdrawals (IRAs, 401(k)s) are exempt. Business asset sales may qualify for a partial exemption under certain conditions.

Can I form a South Dakota dynasty trust from Washington?

Yes — South Dakota trust benefits are available to residents of any state. The trust must have a South Dakota-based trustee (a qualified trust company licensed in South Dakota), but grantors and beneficiaries can be located in Washington or any other state. A Washington resident can establish a South Dakota dynasty trust before selling a business or liquidating investments, potentially sheltering future trust income from both state taxes. Consult a trust attorney before structuring.

Does South Dakota have a capital gains tax?

No — South Dakota has never had a state capital gains tax of any kind. All gains from stocks, ETFs, business sales, real estate, and cryptocurrency are completely free of South Dakota state tax. Only federal capital gains tax applies (0%, 15%, or 20% depending on income and holding period). This directly contrasts with Washington's 7% CGT on gains above ~$278,000.

How does Washington's estate tax work?

Washington's estate tax applies to taxable estates above $3 million (not indexed for inflation since 2014). Tax rates range from 10% on the first dollar above the $3M threshold to 20% for taxable estates above $9 million. A $5 million estate owes approximately $210,000–$280,000 in Washington state estate tax. South Dakota has no estate tax. The practical implication: Seattle homeowners whose homes have appreciated significantly — combined with retirement accounts and investments — may now have estates exceeding the $3M threshold without feeling wealthy.

Which state is better for remote workers?

Depends on equity and assets. Remote workers without capital gains (no stock options, no business interests): essentially equal on taxes; Washington wins on climate and urban infrastructure. Remote workers with significant tech equity (RSUs, options, business interests): South Dakota can save $10,000–50,000+/year in CGT — often worth the lifestyle adjustment. For remote workers with $2M+ investment portfolios generating annual capital gains above $278K: South Dakota's annual savings can exceed the cost-of-living difference between the two states.

Does Washington's CGT apply to inherited assets?

No — Washington's capital gains tax does not apply to inherited assets. Inherited property receives a stepped-up cost basis under federal law, meaning gains accrued before death are wiped out. Only gains realised after inheritance are potentially subject to Washington's CGT (if the heir resides in Washington and later sells). However, Washington's estate tax may apply to the estate itself at death — a separate issue from the CGT.
From the brief
PT20%qualifying work, 10yr
IT€300kall foreign income, 15yr
GR7%foreign income, 15yr
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