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Oregon After-Tax Yield Calculator

What a savings account or CD keeps after Oregon's income tax (4.75% to 9.9% in 2026) and federal tax, and whether a Treasury bill, which Oregon can't tax, keeps more.

In Oregon, a 4.5% APY keeps 3.12% after 22% federal and 8.75% state tax. A 4% Treasury bill, which Oregon can't tax, keeps 3.12%, so they come out even.

Savings keeps, after tax
3.12%
Treasury bill keeps, after tax
3.12%
Better after tax
A tie
Treasury yield that matches the APY
4.00%

Oregon income tax brackets, 2026 (taxable income)

RateSingle filersMarried filing jointly
4.75%$0 to $4,550$0 to $9,100
6.75%$4,550 to $11,400$9,100 to $22,800
8.75%$11,400 to $125,000$22,800 to $250,000
9.90%Over $125,000Over $250,000

What a 4.50% APY keeps in Oregon, by state bracket (22% federal bracket)

Oregon rateSavings or CD keepsT-bill yield that matches it
4.75%3.30%4.23%
6.75%3.21%4.11%
8.75%3.12%4.00%
9.90%3.06%3.93%

How this calculator works

Bank interest (savings, money market and CDs) is ordinary income to Oregon and to the IRS. After-tax yield = APY × (1 − federal rate − Oregon rate − local rate).

Treasury bills, notes and bonds are taxed only federally: federal law bars states from taxing their interest (31 U.S.C. 3124). After-tax yield = T-bill yield × (1 − federal rate).

The Oregon rates are its 2026 brackets as compiled by the Tax Foundation from state law. Choose the bracket your taxable income falls in; the calculator starts at the rate for a single filer with $75,000 of taxable income (8.75%).

What it assumes

  • Your marginal rates apply to all of the interest.
  • Some Oregon cities, counties or school districts tax income as well (on average 0.18% of income where they do). Enter yours as local income tax if it reaches interest.
  • Oregon lets you deduct some or all of your federal income tax, which lowers the state tax slightly; the calculator doesn't model that.
  • It ignores the state tax deduction on your federal return, which matters only if you itemise and are under the SALT cap.

Questions people ask

Does Oregon tax interest from savings accounts and CDs?

Yes. Oregon taxes bank interest as ordinary income at 4.75% to 9.9% in 2026, on top of federal income tax.

Are Treasury bills taxable in Oregon?

No. Interest on Treasury bills, notes, bonds and US savings bonds is exempt from Oregon income tax by federal law. It is still taxed federally.

Is a T-bill or a CD better in Oregon?

At Oregon's 8.75% rate and a 22% federal bracket, a 4.50% CD keeps 3.12%, the same as a T-bill yielding 4.00%. A T-bill paying more than that keeps more.

Do Treasury money market funds avoid Oregon tax?

Most states let you exclude the share of a fund's dividends that came from Treasury interest. Check Oregon's income tax instructions for the rule and the percentage your fund reports.

Other states

Terms explained

Related calculators

  • After-Tax Yield CalculatorWhat a savings or CD rate keeps after federal and state income tax, and whether a Treasury bill, which is free of state tax, keeps more.
  • Savings CalculatorWhat a savings account grows to at an APY, with a deposit every month, year by year.
  • CD CalculatorWhat a certificate of deposit earns by maturity, and what you keep if you close it early and pay the penalty.

Sources

Updated by the RateHerald team. The maths is tested against worked examples; report a problem.