Updated September 7, 2026. Quick answer: Oklahoma’s base statutory probate fee is $135.00, with several small mandatory add-ons layered on by the same statute.
If a trust could save your estate this fee in Oklahoma
A living trust avoids probate entirely in Oklahoma, which means the estate skips the $135.00 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 Oklahoma charges to open probate
This is a flat fee in Oklahoma: $135.00 is what it costs whether the estate is worth $40,000 or $4,000,000.
| Base statutory fee, probate and guardianship | $135.00 |
| Law Library Fund add-on | $6.00 |
| Court Information System Revolving Fund add-on | $25.00 |
| Total of the itemized statutory add-ons | $135.00 plus $6.00 plus $25.00 plus smaller fees |
Where this money goes and who sets it
The authority for this figure is Okla. Stat. tit. 28, § 152(A)(3), (B)-(F). In the source’s own words: “Probate and guardianship…………………$135.00”
What this fee doesn’t cover
Because Oklahoma’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: Okla. Stat. tit. 28, § 152(A)(3), (B)-(F).