How an Oregon paycheck works
Oregon has no sales tax and pays for that with one of the heavier income taxes in the country. Its withholding formula is also the most intricate of any state: it subtracts part of your federal income tax, uses a different rate table depending on how much you earn rather than how much is taxable, and stops giving credit for allowances once your wage passes a threshold. Two of those rules produce genuine steps, and the calculator warns you when your salary is near one.
Federal income tax withholding
Federal withholding annualises the wage, subtracts the standard deduction for the filing status on Form W-4 Step 1, applies the graduated schedule for that status, and deducts the dependent credit from Step 3. This page models a W-4 with Steps 2 and 4 blank: one job, no spouse income, no other income, no extra withholding. In Oregon this figure matters twice, because part of it comes off the state base.
Social Security and Medicare
Social Security takes a flat rate on wages up to an annual ceiling that moves each year. Medicare applies to every dollar, and above a fixed threshold the employer withholds the Additional Medicare tax on the excess. Neither is subtracted from the Oregon base; only federal income tax is.
The federal subtraction, and its ceiling
Oregon lets you subtract federal income tax from your base, but only up to a yearly limit, because state law caps the amount of federal tax that can be subtracted. The cap itself is withdrawn in steps as wages rise: full at moderate incomes, then reduced at each of five thresholds, and gone entirely at the top. Where the cap sits depends on which column you are in, and the married column's thresholds are twice as far out as the single one's.
Two formulas, chosen by your wage
There is one set of rate tables for annual wages below a threshold and another for wages at or above it. The two do not meet. The higher-wage tables carry a smaller constant, so an employee just over the line has slightly less withheld than one just under it. That is what the published formulas say, and the calculator reproduces it rather than smoothing it; when your salary is close to the line the result carries a warning saying so.
Allowances, until they stop
Each allowance is worth a fixed credit against the withholding. Two thresholds matter. Claiming three or more allowances moves a single employee onto the larger standard deduction, the same column married employees use. And once wages pass a limit, higher for married than for single, allowances stop counting altogether, so the withholding jumps by the whole credit for every allowance claimed. This is a cliff rather than a taper, and again the result warns you when your salary is close to it.
Local income tax
Some Oregon jurisdictions levy their own taxes on wages, including transit district taxes and, in the Portland area, county and metro income taxes for specific programmes. None of them is included below, so a Portland employee should expect deductions beyond what is shown.
What the employer pays on top
The employer matches Social Security and Medicare and pays federal unemployment tax at its net rate. Oregon unemployment insurance is an employer contribution at an experience-rated percentage. Paid Leave Oregon contributions are shared between employer and employee, and how much an employer passes on depends on its arrangements, so no paid leave line is shown here.
What this calculator assumes
The figure models a salaried employee paid evenly across the year with a standard Form W-4 and Form OR-W-4, and no pre-tax deductions. It leaves out:
- Pre-tax contributions such as a 401(k), health premiums, HSA or flexible spending accounts, which change the federal figure and therefore the Oregon base too.
- Extra withholding requested on either certificate, and the W-4 Step 2 and Step 4 adjustments.
- Bonuses and other supplemental wages.
- Transit, county and metro taxes, employer-side Oregon unemployment insurance, and Paid Leave Oregon.
Withholding versus your final tax bill
Withholding is a prepayment. On the Oregon return the federal subtraction is based on your actual federal liability rather than what was withheld, and the exemption credit is worked out from your real circumstances, so the two rarely match exactly.