Bank Gap by State

The Bank Gap in Washington

Washington has no state income tax on wages or savings interest, though high earners should note the state does levy a separate capital-gains excise tax on investment gains above a threshold — a different category of income from ordinary interest.

Big-bank average0.38%

Best available4.40%

$1,005/yrlost on a $25k balance · 4.02 pp spread

Last reviewed August 7, 2026 · SwitchWize Research Desk

Best savings APY

4.40%

high-yield

National average

0.38%

big-bank avg

APY gap

4.02 pp

spread

WA tax on interest

None

no income tax

No state tax — full gap is yours

$1,005/yr

on a $25,000 balance

On a $25,000 balance, the gap is about $1,005 a year. Washington has no state income tax, so you keep the full amount.

Estimated Bank Gap by balance

Estimated annual Bank Gap by balance at 0.38% current APY versus 4.40% better-fit APY
Balance	Current earnings	Better-fit earnings	Estimated Bank Gap
$5,000	$19	$220	$201
$10,000	$38	$440	$402
$25,000	$95	$1,100	$1,005
$50,000	$190	$2,200	$2,010
$100,000	$380	$4,400	$4,020

Estimates over 12 months at 0.38% current APY and 4.40% better-fit APY. Example only — your result depends on your balance, rates, and time horizon.

Why Washington changes the math

Washington levies no state income tax, so ordinary savings interest is taxed only at the federal level, removing the Treasury-exemption advantage that matters in states with an income tax. Note this is distinct from the state's capital-gains excise tax, which applies only to gains on the sale of assets above a high threshold, not to interest earned on cash.

The Seattle metro carries living costs well above the rest of Washington, which raises typical emergency-fund sizing for savers in that area relative to the state's smaller cities.

Cost of living in Washington is above the national average, especially in the Seattle metro, which shapes how large an emergency fund needs to be and therefore how many dollars the Bank Gap quietly costs on idle cash.

After-tax tip

Because Washington has no state income tax, the Treasury state-tax advantage does not apply. The simplest high-value move is to put liquid cash in the highest-yielding FDIC-insured savings account.

Open the short-term savings tool

Frequently asked questions

Does Washington tax high-yield savings account interest?

No. Washington has no state income tax, so savings account interest is taxed only at the federal level. There is no state tax drag on the extra interest you earn by switching to a better account.

Is a high-yield savings account worth it in Washington?

Yes. With no state income tax, the after-tax case is simple: moving cash from a national-average account to a top high-yield savings account keeps more in your pocket, and there is no state-tax wrinkle to weigh.

Are T-Bills better than a HYSA for Washington savers?

Usually not on tax grounds. The main edge T-Bills have elsewhere is exemption from state income tax, and Washington has none. For most Washington savers the highest-yielding FDIC-insured savings account is the cleaner choice for liquid cash.

Your personal Bank Gap

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Enter your balance and current rate. The Rate Gap Calculator shows the gap per year and over five years.

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Educational information, not tax or financial advice. State tax rules are summarized at a high level and depend on your full situation. Rates are illustrative of current market conditions and should be confirmed with the provider. Confirm tax treatment with a qualified professional.