Oklahoma Estate Tax Calculator
Estimate the federal estate tax on an Oklahoma decedent’s estate and confirm that Oklahoma itself charges nothing. Oklahoma repealed its estate tax for deaths on or after January 1, 2010, and has no inheritance tax and no gift tax, so for 2024-2026 deaths Oklahoma tax is $0. Distinctive rules modeled: the descendant-count-based elective (forced) share and the two small-estate paths (affidavit and summary administration). Three modes: estimate the tax, test a larger estate, or solve for the years of gifting needed to reach zero. Fields marked * are required; Calculate names any left empty.
Federal: unified estate and gift schedule topping at 40%; basic exclusion $13,610,000 (2024), $13,990,000 (2025), $15,000,000 (2026); federal portability (DSUE) allowed; unlimited marital and charitable deductions; GST 40%.
Exclusion and portability
Gross estate to taxable estate
Tax computation
What heirs receive
Oklahoma succession
Gifting analysis
Three-year gifting projection
How it works
- Oklahoma charges nothing for recent deaths. The Oklahoma estate tax (68 O.S. Ch. 15) was a pick-up tied to the federal state death tax credit (zero after 2004) and was repealed for deaths on or after January 1, 2010 (VERIFY), so no Oklahoma estate tax return is filed. There is no Oklahoma inheritance tax and no Oklahoma gift tax.
- Only federal transfer taxes apply. The federal estate tax applies above the basic exclusion using the unified 18% to 40% schedule, and the federal GST applies at 40% to direct skips above the allocated GST exemption.
- No community property. Oklahoma is a common-law state, so no halving of community assets and no double basis step-up.
- Portability is federal only. A surviving spouse may inherit the unused federal exclusion (DSUE) with a timely Form 706 election; there is no Oklahoma state exclusion to port.
- Elective share follows the intestate pattern. Under 84 O.S. 44 and 84 O.S. 213 (VERIFY) the spouse’s elective / forced share is the whole net estate with no surviving descendants, one-half with one descendant, and one-third with two or more.
- Two small-estate paths. The affidavit for collection of personal property under 58 O.S. 249 is available where personal property is $20,000 or less, and summary administration under 58 O.S. 245 where the estate is $200,000 or less; verify both figures.
- Binding factor names what controls the result: the federal basic exclusion, the federal unified schedule above it, or the GST.
- Gifting mode uses the guarded bisection solver (60 expansions, 90 iterations, rounded up) to find the years of annual-exclusion gifting that bring the taxable estate to the exclusion or below.
- Gifting is not free. Carryover basis loses the step-up; the deferred gain is netted against the tax saved.
Sources
- 68 O.S. Ch. 15 (Oklahoma estate tax, a pick-up tied to the federal state death tax credit) and its repeal for deaths on or after January 1, 2010 (VERIFY exact date); Oklahoma Tax Commission guidance confirming no state estate, inheritance or gift tax for those deaths.
- 84 O.S. 44 (spousal elective / forced share) and 84 O.S. 213 (intestate share of the surviving spouse: whole estate with no descendants, one-half with one, one-third with two or more; VERIFY); 58 O.S. 249 (small-estate affidavit, $20,000 personal property; VERIFY); 58 O.S. 245 (summary administration, $200,000; VERIFY); Oklahoma probate venue in the District Court of the county of domicile (77 counties).
- IRC chapter 11 unified schedule and exclusion ($13,610,000 / $13,990,000 / $15,000,000 for 2024 / 2025 / 2026); IRC 2010 portability; IRC 2042 life insurance inclusion; IRC 2055 charitable deduction; IRC chapter 13 GST at 40%; IRC 1014 step-up and 1015 carryover basis.
- IRS Form 706 and Form 4768 instructions (9-month deadline, 6-month filing extension).
Test cases
Gross 9,000,000; admin 172,400; deductions 587,400; net estate 8,412,600; TE 8,412,600 below 13,990,000. Federal $0, OK $0, TOTAL $0. Headroom 5,577,400; ceiling 14,577,400. Affidavit NOT available (personal property 5,000,000); summary NOT available (gross 9,000,000).
Gross 20,000,000; admin 390,400; deductions 910,400; net estate 19,089,600; TE 19,089,600 above 13,990,000. Federal tentative 7,581,640 less credit 5,541,800 = FEDERAL 2,039,840. OK $0. TOTAL 2,039,840. Effective 10.20%.
Gross 26,000,000; admin 512,400; deductions 937,400; net estate 25,062,600; less marital 8,000,000 = TE 17,062,600; federal exclusion 15,990,000. Federal tentative 6,770,840 less credit 6,341,800 = FEDERAL 429,040. OK $0. TOTAL 429,040. Elective share one-half = 12,531,300.
Gross 20,000,000; admin 394,400; deductions 709,400; net estate 19,290,600; TE 19,290,600 above 15,000,000. FEDERAL 1,716,240. Solver: 76,000 per year; 57 YEARS removes 4,332,000 leaving TE 14,958,600 at or below the exclusion, tax $0. Saved 1,716,240.
Gross 18,000; admin 640; deductions 3,640; net estate 14,360; TE 14,360. Federal $0, OK $0, TOTAL $0. Affidavit available (personal property 18,000 at or below 20,000); summary available (gross 18,000 at or below 200,000). Elective share whole net estate = 14,360.
Estimates only. Not legal, tax or financial advice. The Oklahoma repeal date, elective share and small-estate thresholds are flagged for verification against 68 O.S. Ch. 15, 84 O.S. 44 and 213, and 58 O.S. 245 and 249. Verify all figures with the Oklahoma Tax Commission and federal rules before relying on them.
What Is the Oklahoma Estate Tax Calculator?
The Oklahoma Estate Tax Calculator estimates transfer tax by adding the estate’s entered assets, subtracting permitted deductions in the calculator, adding earlier taxable gifts to the federal base, and applying the encoded federal exclusion and tax schedule. It also reports exclusion headroom, small-estate status, an elective-share estimate, and optional gifting results.
The calculator uses federal basic exclusions of $13,610,000 for 2024, $13,990,000 for 2025, and $15,000,000 for 2026. Entered DSUE from a predeceased spouse is added to that federal exclusion. For all three supported years, Oklahoma estate tax and inheritance tax are calculated as $0.
The interface also states that Oklahoma has no gift tax. Its Oklahoma estate-tax repeal date, descendant-based elective-share treatment, $20,000 affidavit threshold, and $200,000 summary-administration threshold are expressly marked for verification.
How the Oklahoma Estate Tax Calculation Works
The calculator first adds real property, financial accounts, retirement accounts and annuities, life insurance owned by the decedent, and business interests or other property.
G is gross estate. The remaining variables represent the five entered asset categories. The calculator treats Oklahoma as a common-law state and does not apply community-property halving.
Administration costs use gross estate minus entered debts as the fee base. This differs from the field label, which refers to a percentage of net estate. The fee base cannot fall below zero.
D is debt, p is the entered attorney and personal-representative fee percentage, and K is District Court filing and other costs.
The calculator then subtracts debts, funeral expenses, administration costs, and casualty or theft losses. The resulting net estate is floored at zero.
A marital deduction is allowed only when the decedent is marked married and the surviving spouse is either a U.S. citizen or the QDOT option is selected. The marital deduction cannot exceed the net estate. The charitable deduction is then capped at the amount remaining after the marital deduction.
In gifting calculations, each effective annual gift per donee is limited to the calculator’s encoded annual exclusion: $18,000 for 2024 and $19,000 for 2025 or 2026.
Here, g is the entered gift per donee, e is the annual exclusion, n is the number of donees, and y is the number of gifting years. Earlier taxable gifts are added afterward to form the federal base.
BF is the federal base and EF is the total applicable federal exclusion. The calculator uses a progressive federal schedule with rates from 18% through 40%.
S(x) represents the progressive federal schedule encoded in the calculator. Federal generation-skipping transfer tax is calculated separately from entered direct skips and allocated GST exemption.
The two zero terms represent Oklahoma estate tax and Oklahoma inheritance tax.
Worked Example
Suppose a 2025 estate contains $8,000,000 of real property, $6,000,000 of financial assets, $4,000,000 of retirement assets, and $2,000,000 of business property. Gross estate is $20,000,000. Enter $500,000 of debts, $20,000 of funeral expenses, a 2% administration fee, and $400 of court costs.
Administration costs are ($20,000,000 – $500,000) × 2% + $400 = $390,400. Total deductions are $910,400, leaving a taxable estate of $19,089,600.
The calculator’s 2025 federal exclusion is $13,990,000. Its progressive schedule calculates $7,581,640 of tentative tax on the federal base and $5,541,800 of applicable credit. Federal estate tax is $2,039,840. Oklahoma adds $0. With no GST tax, total transfer tax is $2,039,840, displayed as 10.20% of the $20,000,000 gross estate.
How to Use the Oklahoma Estate Tax Calculator
- Select estate-tax mode, larger-estate headroom mode, or the gifting-years solver.
- Choose the year of death and the Oklahoma county of domicile.
- Enter real property, financial accounts, retirement assets, includible life insurance, and business or other property.
- Enter debts, funeral expenses, the attorney and personal-representative fee percentage, court costs, and casualty or theft losses.
- Enter marital status, the number of surviving descendants, spouse citizenship or QDOT status, a spouse bequest, and charitable bequests when applicable.
- Add earlier taxable gifts, DSUE, direct skips, and allocated GST exemption as needed.
- For gifting analysis, enter the number of donees, gift per donee, unrealized gain, capital-gains-rate selection, NIIT choice, and maximum years to test.
- Check the required acknowledgment and select the calculation button.
Estate mode displays total transfer tax. Headroom mode reports whether tax applies, remaining federal exclusion headroom, and a calculated tax-free ceiling. Gifting mode searches for the smallest whole number of years within the selected maximum that reduces total calculated transfer tax to $0.
The form starts in estate mode with 2025 selected. The default fee is 2%, court costs are $400, gift per donee is $19,000, the long-term capital-gains rate is 15%, NIIT is checked, and maximum gifting years is 40. The spouse-citizen box is checked, while county and the required acknowledgment start unselected.
Understanding the Results and Important Assumptions
| Calculator result | Implemented behavior |
|---|---|
| Federal exclusion | $13,610,000 for 2024, $13,990,000 for 2025, or $15,000,000 for 2026, plus entered DSUE. |
| Oklahoma estate and inheritance tax | Both are fixed at $0 for the supported years. |
| Effective transfer-tax rate | Total transfer tax divided by gross estate and displayed to two decimal places. |
| Federal marginal-rate display | Shows 40% when the federal base exceeds the applicable exclusion and 0% otherwise. |
| Small-estate affidavit | Marked available when calculated personal property is $20,000 or less. |
| Summary administration | Marked available when gross estate is $200,000 or less. |
Descendant-Based Elective Share
The calculator estimates an elective or forced share only when the married option is selected. It uses the entered number of surviving descendants: the entire net estate with none, one-half with one descendant, and one-third with two or more.
N is the calculator’s net estate and d is the entered descendant count. This elective-share amount is displayed separately from the marital deduction. The interface flags the underlying Oklahoma rule for verification.
Two Small-Estate Tests
The affidavit test uses personal property equal to financial accounts plus retirement accounts, life insurance, and business or other property. Real property is excluded from that calculation. The calculator marks the affidavit as available when this personal-property total is $20,000 or less.
The summary-administration test is different. It compares the calculator’s full gross estate with $200,000 and marks summary administration as available when gross estate is at or below that amount. Both thresholds are flagged in the interface for verification.
Federal Headroom and Tax-Free Ceiling
Remaining exclusion headroom equals the applicable federal exclusion minus the federal base, with negative results changed to zero. The displayed tax-free ceiling adds this headroom to the current gross estate.
This ceiling is the calculator’s direct formula for the current estate profile. It is not a separate iterative recalculation of every deduction or assumption at a larger gross-estate value.
Gifting Solver and Three-Year Projection
The gifting solver looks for the smallest whole number of years that makes total transfer tax zero. It expands its search range and then performs up to 90 binary-search iterations before rounding the result upward to a whole year. The maximum-years input accepts values from 1 through 100.
Only the annual-exclusion portion of each entered gift reduces the estate in this calculation. If the gift per donee is larger than the encoded annual exclusion, the reduction is capped at the annual exclusion. The excess is not added to prior taxable gifts by this gifting-plan logic.
The results also show calculated tax after one, two, and three years of gifting and cumulative tax saved after three years. A positive GST liability can prevent the solver from reaching zero because the annual gifting reduction does not change direct-skips or GST-exemption inputs.
Input Validation and Display Formatting
Most dollar inputs accept values from $0 through $100,000,000. The administration-fee percentage accepts 0% through 25%. Descendants accept 0 through 20, donees accept 0 through 200, and maximum gifting years accept 1 through 100.
Mode, death year, county, long-term capital-gains-rate selection, and the acknowledgment are required. The donees field is also marked required in gifting mode. However, zero is within its allowed numeric range, so entering zero can pass the implemented validation even though the field’s error text asks for one or more donees.
Fields such as descendants, donees, and maximum years use whole-number steps in the interface. The JavaScript range validation does not separately test whether an entered value is an integer. Those fields are later read with integer parsing for the calculation.
The Calculate button remains enabled even when required information is missing. Selecting it runs validation and displays the missing or out-of-range fields. Currency results are rounded to the nearest whole dollar, while the effective transfer-tax rate is displayed to two decimal places.
Gifting Basis Output Limitation
The gifting section accepts unrealized gain, a long-term capital-gains rate of 0%, 15%, or 20%, and an optional 3.8% NIIT setting. However, the calculation result does not return the entered unrealized-gain value that the numeric deferred-capital-gains and net-benefit rows reference. As implemented, those numeric outputs format as $0 instead of reflecting the entered gain.
The detailed “Net to other heirs” result subtracts marital and charitable bequests and total transfer tax from the net estate, then floors a negative value at $0. The shorter estate-mode summary performs similar arithmetic without that zero floor, so the two displays can differ in an extreme case.
This calculator provides estimates based on its encoded assumptions. Actual estate-tax filing, probate, deduction, inheritance, and elective-share outcomes can depend on facts the tool does not model. Several Oklahoma legal figures are specifically flagged for verification, so the result should not be treated as legal, tax, or financial advice.
Estate Tax Calculators for All 50 U.S. States
Frequently Asked Questions
Does this calculator charge Oklahoma estate tax?
No. The implemented calculation sets both Oklahoma estate tax and Oklahoma inheritance tax to $0 for the supported 2024, 2025, and 2026 death years. A positive total can still come from federal estate tax or federal GST tax.
How does DSUE affect the Oklahoma estate tax calculator?
The calculator adds entered DSUE directly to the federal basic exclusion. For example, $2,000,000 of DSUE added to the calculator’s $13,990,000 basic exclusion for 2025 produces a total applicable federal exclusion of $15,990,000.
How are earlier taxable gifts treated?
Earlier taxable gifts are added to the taxable estate to create the federal base. They therefore affect the federal exclusion comparison and progressive federal tax calculation. The calculator does not add an Oklahoma gift tax or a separate Oklahoma gift add-back.
How does the Oklahoma elective-share estimate work?
If the married box is selected, the calculator uses the full net estate with zero descendants, one-half of the net estate with one descendant, or one-third with two or more descendants. It displays this estimate separately from any marital deduction and flags the underlying rule for verification.
How does the gifting-years solver calculate the answer?
The solver caps the effective gift per donee at the encoded annual exclusion, multiplies it by the number of donees and years, and subtracts that amount from the taxable estate. It repeatedly recalculates total transfer tax until it finds the earliest whole year that produces $0 or reaches the selected maximum.
What is the difference between the two small-estate results?
The affidavit result uses only financial, retirement, life-insurance, and business or other personal property and compares that sum with $20,000. The summary-administration result instead compares the full gross estate with $200,000. Because they use different bases, one result can be available when the other is not.
When does the calculator mark federal Form 706 as required?
The calculator marks Form 706 as required when the federal base exceeds the applicable federal exclusion. Its results display a filing deadline of nine months after death and state that Form 4768 extends the filing deadline by six months. These are calculator outputs and should be checked against the requirements that apply to the actual estate.