Updated September 7, 2026. Quick answer: Idaho charges a flat $166.00 statewide, whether the probate petition is formal or informal.
If a trust could save your estate this fee in Idaho
A living trust avoids probate entirely in Idaho, which means the estate skips the $166.00 above along with every other cost the court charges once a case is open. LawDepot builds a state-specific one.
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What Idaho charges to open probate
This is a flat fee in Idaho: $166.00 is what it costs whether the estate is worth $40,000 or $4,000,000.
| Petition for formal probate | $166.00 |
| Application for informal probate | $166.00 |
| Total to open the estate | $166.00 |
Where this money goes and who sets it
The authority for this figure is Idaho Courts Administrative Rules, Appendix A (Idaho Code § 31-3201A), effective July 12, 2024. In the source’s own words: “5. Petition for formal probate 6. Application for informal probate … Total 166.00”
What this fee doesn’t cover
Because Idaho’s fee is flat, it doesn’t rise as the estate grows, but it also doesn’t shrink for a small, simple estate the way a percentage-based state’s fee would. Either way, this is the court’s own charge just to open the file and issue letters, separate from what an attorney charges to actually handle the estate and separate from any state estate or inheritance tax the estate itself might owe.
Sources
Source: Idaho Courts Administrative Rules, Appendix A (Idaho Code § 31-3201A), effective July 12, 2024.