There is no inheritance tax in South Dakota. The state also has no estate tax and no state income tax, so money or property you inherit from a South Dakota resident is not taxed by the state at all. Voters repealed the inheritance tax through a constitutional amendment effective July 1, 2001, and the state constitution now prohibits the legislature from reenacting one.1Ballotpedia. South Dakota Amendment C, Repeal State Inheritance Tax Measure (2000) Federal taxes and probate can still apply, though, and those are where heirs sometimes run into trouble.
What South Dakota Does Not Tax
Three taxes commonly reach inherited wealth in other states. South Dakota imposes none of them:
- No inheritance tax on what beneficiaries receive.
- No estate tax on the deceased person’s estate.
- No state income tax on distributions from inherited retirement accounts or on any other income.2South Dakota Department of Revenue. Taxes
Because there is no state tax on inheritances, there is also no South Dakota return for heirs or executors to file on the inheritance itself. The only tax filings connected to a South Dakota estate are federal.
Federal Estate Tax: The Real Threshold to Watch
The federal estate tax is a separate matter from state inheritance tax, and it applies to South Dakota estates like any others. Starting January 1, 2026, under the One Big Beautiful Bill Act, the federal estate tax exemption is $15 million per individual, with annual inflation adjustments going forward.3Internal Revenue Service. What’s New — Estate and Gift Tax Estates below that threshold owe no federal estate tax.
Estates above $15 million are taxed at graduated rates, with the top rate at 40% on amounts that exceed the exemption by more than $1 million.3Internal Revenue Service. What’s New — Estate and Gift Tax The estate pays this tax before assets are distributed; it is not charged to individual beneficiaries.
Married couples can effectively double the shield through portability. If the first spouse to die does not use the full $15 million exemption, the surviving spouse can claim the unused portion, protecting up to $30 million. To keep that option open, the executor has to file a timely federal estate tax return (Form 706) for the first spouse’s estate even when no tax is owed.3Internal Revenue Service. What’s New — Estate and Gift Tax
Inherited IRAs and 401(k)s
Retirement accounts work differently from other inherited property, and this catches heirs off guard. Distributions from an inherited traditional IRA or 401(k) are taxed as ordinary income at the federal level. South Dakota’s lack of a state income tax means there is no state layer on top, but the federal tax still applies.4Internal Revenue Service. Retirement Plan and IRA Required Minimum Distributions FAQs
Timing matters too. Under the SECURE Act, most non-spouse beneficiaries have to withdraw everything from 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 beneficiaries 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 instead.
Pulling the whole balance in a single year can push you into a much higher federal bracket. Spacing withdrawals across the ten years keeps each year’s taxable income lower.
Step-Up in Basis
One of the biggest tax benefits of inheriting property has nothing to do with inheritance or estate taxes. Under federal law, your basis in an inherited asset 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 reset is called a step-up in basis.
In practice: if your parent bought farmland for $50,000 decades ago and it is worth $500,000 at their death, selling it during their lifetime would have meant capital gains tax on $450,000. If you inherit it instead, your basis is $500,000. Sell for $500,000 and you owe no capital gains tax. Sell for $520,000 and you pay tax only on the $20,000 gain. The sale gets reported on Schedule D using the date-of-death value as the starting point.7Internal Revenue Service. Gifts and Inheritances
Probate Still Happens
No state tax does not mean no process. Most South Dakota estates still go through probate, which validates the will, pays debts, and distributes assets. Probate is handled in the circuit court of the county where the deceased lived or owned property.8South Dakota Legislature. South Dakota Codified Laws 29A-3-301
Small Estate Affidavit
If the whole estate, after subtracting debts and liens, is worth $100,000 or less, heirs can skip formal probate and collect assets using a small estate affidavit. The affidavit can be used 30 days after the death.9South Dakota Legislature. South Dakota Codified Laws 29A-3-1201 That avoids the court filings, inventories, and creditor notice steps that come with full probate.
Informal and Formal Probate
Estates above $100,000 generally go through either informal or formal probate. Informal probate is faster; the personal representative applies to the court clerk and administers the estate without ongoing court supervision. Formal probate involves more oversight and is used when the will is contested, there is a fight over who should serve as personal representative, or other disputes come up.
In both tracks, the personal representative has to publish notice to creditors once a week for three consecutive weeks in a local legal newspaper. Creditors then have four months from the date of the first publication to file claims, or those claims are barred.10South Dakota Legislature. South Dakota Codified Laws 29A-3-801
If You Live Outside South Dakota
Inheriting from a South Dakota resident while living elsewhere means you still get the benefit of South Dakota’s tax-free treatment on the South Dakota side. The estate owes South Dakota nothing.
Your home state is another question. Six states currently impose their own inheritance tax: Iowa, Kentucky, Maryland, Nebraska, New Jersey, and Pennsylvania. If you live in one of them, you may owe inheritance tax to your home state depending on the type of property inherited and your relationship to the deceased. Rates and exemptions vary, and close relatives such as spouses and children are typically exempt or taxed at lower rates.
Real property in South Dakota, including farmland, houses, and mineral rights, has to go through South Dakota probate no matter where the heir lives. If the deceased owned property in more than one state, each state runs its own probate proceeding, known as ancillary probate. Nonresident heirs in that situation usually need a South Dakota attorney to handle the in-state piece.
Federal Deadlines and Penalties
When an estate exceeds the $15 million federal exemption, the executor has to file Form 706 within nine months of the date of death. Form 4768 gets an automatic six-month filing extension, but the extension does not extend the payment deadline.11Internal Revenue Service. Instructions for Form 706 Smaller estates may still want to file Form 706 to elect portability for the surviving spouse.
Federal penalties on an estate tax return are steep, and they fall on the executor personally:
- Late filing: 5% of the unpaid tax for each month the return is late, capped at 25%.12Office of the Law Revision Counsel. 26 U.S. Code 6651
- Late payment: unpaid estate taxes accrue interest from the original due date, whether or not an extension was filed.
- Fraud: the civil fraud penalty is 75% of the underpaid tax when the IRS finds that assets were deliberately undervalued or hidden, and willful fraud can be referred for criminal prosecution.13Internal Revenue Service. 20.1.5 Return Related Penalties14Internal Revenue Service. 4.25.7 Estate and Gift Tax Penalty and Fraud Procedures
Executors can also face personal liability under state probate law for mismanaging the estate, failing to pay valid creditor claims, or distributing assets improperly. Beneficiaries who believe assets were mishandled can petition the court to remove the executor and seek restitution. For estates with significant assets or anything complicated, working with a probate attorney or tax professional is usually the safer route than handling it alone.