Does South Dakota tax retirement income?

No. South Dakota has no state income tax, so Social Security, pensions, annuities, and 401(k)/IRA withdrawals are all completely free of state income tax. There is no state return to file on this income.

Is Social Security taxed in South Dakota?

Not at the state level. South Dakota imposes no income tax on Social Security. A portion of your benefits may still be taxable on your federal return depending on your total provisional income.

How is the federally taxable Social Security figured?

The IRS compares your provisional income — other income plus half your benefits — to thresholds. Below the lower threshold none is taxable; above the upper threshold up to 85% of benefits becomes federally taxable.

Are 401(k) and IRA withdrawals taxed in South Dakota?

No. Traditional 401(k) and IRA withdrawals are fully exempt from South Dakota state income tax. They remain ordinary income on your federal return in the year you take them.

Is this an official tax calculation?

No. The state figure is definitively zero, but the federal Social Security estimate uses the IRS worksheet and does not compute your full federal bracket. Confirm federal numbers with a tax professional.

South Dakota Retirement Income Tax Calculator

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South Dakota is one of the most retiree-friendly states because it has no state income tax. That means your Social Security, pension, annuity, and 401(k)/IRA withdrawals are entirely free of South Dakota state tax. This tool confirms the $0 state liability and estimates the federally taxable portion of your Social Security so you see the full picture.

How it works

The South Dakota side is simple — every retirement dollar is state-tax-free. The federal Social Security estimate uses the IRS provisional-income worksheet:

provisional income = other income + ½ × Social Security

Below the lower threshold ($25,000 single, $32,000 joint): none of your Social Security is federally taxable.
Between thresholds: up to 50% of benefits become federally taxable.
Above the upper threshold ($34,000 single, $44,000 joint): up to 85% of benefits become federally taxable.

Pensions and traditional withdrawals are fully federally taxable as ordinary income, but South Dakota taxes none of it.

Tips and example

A single retiree with $24,000 of Social Security, a $20,000 pension, and $10,000 of IRA withdrawals pays $0 to South Dakota. Federally, their provisional income of $42,000 pushes them above the upper threshold, so a large share of their Social Security becomes federally taxable.

The federal figures here estimate taxability, not your final federal bill. Confirm federal numbers with a tax professional. South Dakota’s state tax on all of this is zero.