The American Indian Probate Reform Act of 2004 (AIPRA, Public Law 108-374) replaced state inheritance law with a uniform federal probate code for trust and restricted land, effective June 20, 2006. Its core effects: a valid will gives an owner broad control over trust interests; without a will, federal intestacy rules decide — generally a life estate for a surviving spouse, inheritance by eligible heirs such as children and grandchildren, and a single-heir rule for small fractional interests under 5 percent of a tract.
Read this page as a map, not a manual. Federal Indian probate law is one of the most technical areas of estate law in the country, outcomes turn on facts specific to each family and each reservation, and nothing here is legal advice. Any decision about a will, a specific parcel, or a pending probate belongs with an attorney experienced in federal Indian law.
Why Congress passed it
Under the allotment policy of the late 1800s, individual owners received tracts of reservation land now held in trust by the federal government. For most of the following century those allotments were probated under state law, which split ownership among ever more heirs — by the early 2000s, the National Congress of American Indians counted more than three million ownership interests across roughly 120,000 tracts, with some tracts holding hundreds of co-owners. AIPRA’s federal code was designed to limit that fractionation, keep land with an owner’s Indian heirs, and encourage the writing of wills.
The rules in outline
| Situation | What AIPRA generally provides |
|---|---|
| Valid will | Broad control over trust interests, with limits — including restrictions on devising trust land to non-Indians who are not lineal descendants |
| No will, surviving spouse | The spouse generally receives a life estate; the property then passes to eligible heirs |
| No will, no spouse | Inheritance by children, grandchildren, parents, or siblings who are eligible heirs; if none, the interest can pass to the tribe |
| Interest under 5% of a tract, no will | The single-heir rule: the interest passes to one heir rather than being divided, to prevent further fractionation |
| During probate | The tribe, co-owners, or the federal government may in some circumstances purchase interests, with consent rules that differ for small interests |
Summary based on the NCAI Quick Guide to AIPRA (2006) and the statute; details have been amended and interpreted since, which is one more reason to verify any specific rule with counsel.
Two variations worth knowing. First, tribal nations may adopt their own probate codes for allotments on their reservations, subject to Interior approval — so the governing rules can differ from nation to nation. Second, some reservations are covered by their own federal probate provisions rather than AIPRA’s defaults. Rules genuinely vary; no single summary fits all nine of South Dakota’s tribal nations.
The process itself runs through the federal government: the BIA prepares the probate package, and the Department of the Interior’s Office of Hearings and Appeals issues the decision under the procedures in 43 CFR Part 30. Trust funds in the decedent’s IIM account are then distributed by the Bureau of Trust Funds Administration — see what an IIM account is.
One planning contrast: because AIPRA governs only trust property, a life insurance policy with a named beneficiary sits entirely outside this process — the carrier pays the beneficiary directly, on its own timeline. That interaction is covered in does life insurance go through probate on trust land? and in our full guide to life insurance and annuities for American Indian families in South Dakota.