Bank Gap by State

The Bank Gap in North Carolina

North Carolina's flat income tax is on a scheduled multi-year decline, and the current 4.5% rate applies to savings interest against living costs that are rising fastest in the state's two largest metros.

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

NC tax on interest

4.50%

top marginal rate

Before NC tax

$1,005/yr

on a $25,000 balance

After NC 4.5% tax

$960/yr

recoverable by switching

On a $25,000 balance, the gap is about $1,005 a year before tax. After North Carolina's 4.5% top income-tax rate on the additional interest, you keep about $960. Because Treasury interest is exempt from North Carolina income tax, routing that cash through a state-tax-exempt Treasury vehicle can recover most of the difference.

Estimated Bank Gap by balance

Estimated annual Bank Gap by balance at 0.38% current APY versus 4.40% better-fit APY, before and after NC state income tax
Balance	Current earnings	Better-fit earnings	Estimated Bank Gap	After NC tax
$5,000	$19	$220	$201	$192
$10,000	$38	$440	$402	$384
$25,000	$95	$1,100	$1,005	$960
$50,000	$190	$2,200	$2,010	$1,920
$100,000	$380	$4,400	$4,020	$3,839

Estimates over 12 months at 0.38% current APY and 4.40% better-fit APY. The "After NC tax" column applies NC's 4.5% top income-tax rate to the additional interest; federal tax applies on top and is not shown. Example only — your result depends on your balance, rates, and time horizon.

Why North Carolina changes the math

North Carolina taxes interest income at a flat 4.5% rate, already lower than in past years under a phase-down written into state law. Treasury interest is exempt from that tax, giving a modest and slightly growing after-tax edge to T-Bills as the state rate continues to fall.

Housing costs in the Raleigh-Durham and Charlotte metros have climbed faster than the rest of North Carolina, gradually raising typical emergency-fund targets in those areas.

Cost of living in North Carolina is near the national average, rising in the Raleigh and Charlotte metros, 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 North Carolina taxes savings interest but not Treasury interest, the highest after-tax yield is not always the highest headline APY. Run your tax profile through the short-term savings tool to see whether a Treasury bill or government money market fund beats a taxable account for you.

Open the short-term savings tool

Frequently asked questions

Does North Carolina tax high-yield savings account interest?

Yes. North Carolina treats savings interest as taxable income, with a top rate of 4.5%. Interest from U.S. Treasury bills and the Treasury portion of a government money market fund is generally exempt from North Carolina income tax, which can change the after-tax winner for higher earners.

Is a high-yield savings account worth it in North Carolina?

Yes. Even after North Carolina state tax, moving cash from a national-average account to a top high-yield savings account still leaves you with substantially more interest. The Bank Gap is far larger than the state-tax drag on the additional interest.

Are T-Bills better than a HYSA for North Carolina savers?

They can be for higher earners. Because Treasury interest is exempt from North Carolina income tax, a T-Bill or government money market fund can deliver a higher after-tax yield than a fully taxable savings account at a similar headline rate. The short-term savings calculator computes the breakeven for your exact tax situation.

Your personal Bank Gap

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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.