There is no inheritance tax in South Dakota. Voters repealed it by constitutional amendment in 2000, effective July 1, 2001, and the state constitution now bars the legislature from ever bringing it back.1Ballotpedia. South Dakota Amendment C, Repeal State Inheritance Tax Measure (2000) South Dakota also has no estate tax and no state income tax. That does not mean an inheritance is tax-free in every direction: federal estate tax, federal income tax on inherited retirement accounts, and probate in the county circuit court can all still apply.
What South Dakota Does Not Tax
Three taxes commonly hit inherited wealth in other states. South Dakota imposes none of them.2South Dakota Department of Revenue. Taxes Beneficiaries owe no state inheritance tax on what they receive. The estate itself owes no state estate tax. And distributions from an inherited traditional IRA or 401(k) are not taxed at the state level, because South Dakota has no state income tax at all.
Before the 2001 repeal, South Dakota’s inheritance tax rates varied by the heir’s relationship to the deceased, with distant relatives and unrelated heirs paying more than spouses or children. That system is gone. It does not matter today whether you are a child, a sibling, a cousin, a friend, or an unrelated beneficiary: South Dakota takes nothing.
The Federal Estate Tax Can Still Apply
The federal government taxes large estates regardless of what the state does. Starting January 1, 2026, the federal estate tax exemption is $15 million per individual under the One Big Beautiful Bill Act, replacing the expiring Tax Cuts and Jobs Act figure that had been set to revert to roughly $7 million. The $15 million amount will continue to be adjusted annually for inflation.3Internal Revenue Service. What’s New — Estate and Gift Tax
Estates above the threshold are taxed at graduated rates, topping out at 40% on amounts more than $1 million above the exemption.3Internal Revenue Service. What’s New — Estate and Gift Tax This is a tax on the estate, not on the beneficiaries. The executor pays it out of estate assets before making distributions.
Married couples can effectively double their exemption through portability. If the first spouse to die does not use their full $15 million, the survivor can claim the unused portion, potentially shielding up to $30 million. To preserve that option, the executor has to file a timely estate tax return (Form 706) for the first spouse, even when no tax is owed.3Internal Revenue Service. What’s New — Estate and Gift Tax
Inherited Retirement Accounts
Inherited traditional IRAs and 401(k)s are the place heirs most often get caught by a tax they did not expect. Distributions are taxed as ordinary income at the federal level.4Internal Revenue Service. Retirement Plan and IRA Required Minimum Distributions FAQs South Dakota’s lack of a state income tax softens the total bill, but the federal tax still applies.
Timing matters. Under the SECURE Act, most non-spouse beneficiaries must empty an inherited IRA or 401(k) by the end of the tenth year after the original owner’s death.5Internal Revenue Service. Retirement Topics – Beneficiary Surviving spouses, minor children of the deceased, disabled or chronically ill beneficiaries, and heirs not more than ten years younger than the deceased are exempt from the ten-year rule and can stretch distributions over their own life expectancy.
How you space withdrawals across those ten years changes what you pay. Pulling everything out in a single year can push you into a much higher federal bracket. Spreading distributions over several years usually keeps the annual taxable income lower.
Step-Up in Basis on Inherited Property
One of the most useful federal rules for heirs has nothing to do with inheritance or estate tax. When you inherit an asset, your tax basis resets to its fair market value on the date of the owner’s death.6Office of the Law Revision Counsel. 26 U.S. Code 1014 – Basis of Property Acquired From a Decedent That is the step-up in basis.
Say a parent bought South Dakota farmland decades ago for $50,000, and it is worth $500,000 the day they die. If they had sold it during life, they would have owed capital gains tax on the $450,000 gain. Because you inherited it, your basis is $500,000. Sell for $500,000 and you owe no capital gains tax. Sell for $520,000 and you owe tax only on the $20,000 difference. You report the sale on Schedule D, starting from the date-of-death value.7Internal Revenue Service. Gifts and Inheritances
Probate Still Happens
No state tax does not mean no state process. Most estates in South Dakota still go through probate in the county circuit court where the deceased lived or owned property.8South Dakota Legislature. South Dakota Codified Laws 29A-3-301
Small Estates
If the entire estate, after debts and liens, is worth $100,000 or less, heirs can skip formal probate and use a small estate affidavit to collect assets. The affidavit is available 30 days after the death.9South Dakota Legislature. South Dakota Codified Laws 29A-3-1201
Informal and Formal Probate
Estates above $100,000 generally go through informal or formal probate. Informal probate is quicker: the personal representative applies to the court clerk and administers the estate without ongoing court supervision. Formal probate involves more court oversight and is used when there is a will contest, a fight over who should serve as personal representative, or another disputed issue.
In either track, the personal representative publishes a notice to creditors once a week for three consecutive weeks in a local legal newspaper. Creditors then have four months from the first publication to file claims, or their claims are barred.10South Dakota Legislature. South Dakota Codified Laws 29A-3-801 – Notice to Creditors
If You Live in Another State
South Dakota’s tax-free treatment applies on the South Dakota side. Your own state’s laws are a separate question. Six states impose their own inheritance tax: Iowa, Kentucky, Maryland, Nebraska, New Jersey, and Pennsylvania. If you live in one of them, you may owe tax to your home state depending on the property inherited and your relationship to the deceased. Close relatives are typically exempt or pay reduced rates.
Real property in South Dakota, such as farmland, a house, or mineral rights, goes through South Dakota’s probate process no matter where the heir lives. If the deceased owned property in more than one state, each state requires its own proceeding, called ancillary probate. Nonresident heirs in that situation often need a South Dakota attorney for the in-state portion.
South Dakota also abolished the Rule Against Perpetuities in 1983, which is why many out-of-state families set up dynasty trusts in the state. If you inherit a beneficial interest in a South Dakota trust, South Dakota law governs the trust, but your home state may still tax the income you receive from it.
Federal Filing Deadlines and Penalties
For estates over the $15 million exemption, the executor must file Form 706 within nine months of the date of death. An automatic six-month extension is available by filing Form 4768, but that extends only the filing deadline, not the payment deadline.11Internal Revenue Service. Instructions for Form 706 Estates below the threshold may still file Form 706 to elect portability for a surviving spouse.
Federal penalties fall on the executor personally. A late Form 706 triggers a penalty of 5% of the unpaid tax per month, capped at 25%.12Office of the Law Revision Counsel. 26 U.S. Code 6651 – Failure to File Tax Return or to Pay Tax13Internal Revenue Service. 20.1.5 Return Related Penalties14Internal Revenue Service. 4.25.7 Estate and Gift Tax Penalty and Fraud Procedures
Since South Dakota imposes no inheritance or estate tax, there is no state tax return to file. The filing obligations are the federal estate tax return, when applicable, and the probate documents with the county circuit court.