PolicyEngine · DTrim99 · Jan 9, 2026 · Jan 9, 2026 · Jan 12, 2026
diff --git a/changelog_entry.yaml b/changelog_entry.yaml
@@ -1,4 +1,6 @@
-- bump: minor
+- bump: patch
   changes:
-    added:
-      - Add Florida Temporary Cash Assistance (TCA) program.
+    changed:
+      - Add 2025 references to all Missouri income tax parameters.
+      - Add 2025 value for mo_max_social_security_benefit ($48,216).
+      - Add 2025 test cases for Missouri income tax and capital gains subtraction.
diff --git a/policyengine_us/parameters/gov/states/mo/tax/income/credits/property_tax/age_threshold.yaml b/policyengine_us/parameters/gov/states/mo/tax/income/credits/property_tax/age_threshold.yaml
@@ -6,6 +6,8 @@ metadata:
   period: year
   label: Missouri property tax credit age threshold
   reference:
+    - title: 2025 MO-PTC Property Tax Credit Claim
+      href: https://dor.mo.gov/forms/MO-PTC%20Instructions_2025.pdf#page=1
     - title: MO-PTS 2024 Property Tax Credit Schedule
       href: https://dor.mo.gov/forms/MO-PTS_2024.pdf#page=1
     - title: 2023 Form MO-PTS - Property Tax Credit Schedule

diff --git a/...ne_us/parameters/gov/states/mo/tax/income/credits/property_tax/aged_survivor_min_age.yaml b/...ne_us/parameters/gov/states/mo/tax/income/credits/property_tax/aged_survivor_min_age.yaml
@@ -6,8 +6,10 @@ metadata:
   period: year
   label: Missouri property tax credit aged survivor minimum age
   reference:
+    - title: 2025 MO-PTC Property Tax Credit Claim
+      href: https://dor.mo.gov/forms/MO-PTC%20Instructions_2025.pdf#page=1
     - title: MO Rev 135.010
-    - https://revisor.mo.gov/main/OneSection.aspx?section=135.010&bid=6435
+      href: https://revisor.mo.gov/main/OneSection.aspx?section=135.010&bid=6435
   # Quote from above legislative reference:
   #   the claimant has reached the age of sixty on or before the
   #   last day of the calendar year and such claimant received

diff --git a/...s/parameters/gov/states/mo/tax/income/credits/property_tax/income_offset/joint_owner.yaml b/...s/parameters/gov/states/mo/tax/income/credits/property_tax/income_offset/joint_owner.yaml
@@ -6,6 +6,8 @@ metadata:
   period: year
   label: Missouri income offset for married joint unit that owns house (and paid no rent)
   reference:
+    - title: 2025 MO-PTC Property Tax Credit Claim
+      href: https://dor.mo.gov/forms/MO-PTC%20Instructions_2025.pdf#page=2
     - title: MO-PTS 2024 Property Tax Credit Schedule, Line 9
       href: https://dor.mo.gov/forms/MO-PTS_2024.pdf#page=2
     - title: MO-PTS 2023 Property Tax Credit Schedule, Line 9

diff --git a/.../parameters/gov/states/mo/tax/income/credits/property_tax/income_offset/joint_renter.yaml b/.../parameters/gov/states/mo/tax/income/credits/property_tax/income_offset/joint_renter.yaml
@@ -6,6 +6,8 @@ metadata:
   period: year
   label: Missouri income offset for married joint unit that paid some rent
   reference:
+    - title: 2025 MO-PTC Property Tax Credit Claim
+      href: https://dor.mo.gov/forms/MO-PTC%20Instructions_2025.pdf#page=2
     - title: MO-PTS 2024 Property Tax Credit Schedule, Line 9
       href: https://dor.mo.gov/forms/MO-PTS_2024.pdf#page=2
     - title: MO-PTS 2023 Property Tax Credit Schedule, Line 9

diff --git a/..._us/parameters/gov/states/mo/tax/income/credits/property_tax/income_offset/non_joint.yaml b/..._us/parameters/gov/states/mo/tax/income/credits/property_tax/income_offset/non_joint.yaml
@@ -6,6 +6,8 @@ metadata:
   period: year
   label: Missouri income offset for all tax units that did not file as married joint
   reference:
+    - title: 2025 MO-PTC Property Tax Credit Claim
+      href: https://dor.mo.gov/forms/MO-PTC%20Instructions_2025.pdf#page=2
     - title: MO-PTS 2024 Property Tax Credit Schedule, Line 9
       href: https://dor.mo.gov/forms/MO-PTS_2024.pdf#page=2
     - title: MO-PTS 2023 Property Tax Credit Schedule, Line 9

diff --git a/policyengine_us/parameters/gov/states/mo/tax/income/credits/property_tax/phase_out/rate.yaml b/policyengine_us/parameters/gov/states/mo/tax/income/credits/property_tax/phase_out/rate.yaml
@@ -6,5 +6,7 @@ metadata:
   period: year
   label: Missouri property tax credit phaseout rate
   reference:
+    - title: 2025 Property Tax Credit Chart
+      href: https://dor.mo.gov/forms/Property%20Tax%20Claim%20Chart_2025.pdf
     - title: MO Rev Stat § 135.030
       href: https://revisor.mo.gov/main/OneSection.aspx?section=135.030&bid=6439
diff --git a/policyengine_us/parameters/gov/states/mo/tax/income/credits/property_tax/phase_out/step.yaml b/policyengine_us/parameters/gov/states/mo/tax/income/credits/property_tax/phase_out/step.yaml
@@ -6,5 +6,7 @@ metadata:
   period: year
   label: Missouri property tax credit phaseout step size
   reference:
+    - title: 2025 Property Tax Credit Chart
+      href: https://dor.mo.gov/forms/Property%20Tax%20Claim%20Chart_2025.pdf
     - title: MO Rev Stat § 135.030
       href: https://revisor.mo.gov/main/OneSection.aspx?section=135.030&bid=6439
diff --git a/...gine_us/parameters/gov/states/mo/tax/income/credits/property_tax/phase_out/threshold.yaml b/...gine_us/parameters/gov/states/mo/tax/income/credits/property_tax/phase_out/threshold.yaml
@@ -7,6 +7,8 @@ metadata:
   period: year
   label: Missouri property tax credit phaseout threshold
   reference:
+    - title: 2025 MO-1040 Book - Individual Income Tax Long Form
+      href: https://dor.mo.gov/forms/MO-1040%20Instructions_2025.pdf#page=50
     - title: 2024 MO-1040 Book - Individual Income Tax Long Form
       href: https://dor.mo.gov/forms/MO-1040%20Instructions_2024.pdf#page=50
     - title: 2023 MO-1040 Book - Individual Income Tax Long Form

diff --git a/...ngine_us/parameters/gov/states/mo/tax/income/credits/property_tax/property_tax_limit.yaml b/...ngine_us/parameters/gov/states/mo/tax/income/credits/property_tax/property_tax_limit.yaml
@@ -6,6 +6,8 @@ metadata:
   period: year
   label: Missouri property tax credit limit for property owners
   reference:
+    - title: 2025 MO-PTC Property Tax Credit Claim
+      href: https://dor.mo.gov/forms/MO-PTC%20Instructions_2025.pdf#page=2
     - title: MO-PTS 2024 Property Tax Credit Schedule, Line 11
       href: https://dor.mo.gov/forms/MO-PTS_2024.pdf#page=2
     - title: 2023 MO-PTS Property Tax Credit Schedule, Line 11

diff --git a/..._us/parameters/gov/states/mo/tax/income/credits/property_tax/property_tax_rent_ratio.yaml b/..._us/parameters/gov/states/mo/tax/income/credits/property_tax/property_tax_rent_ratio.yaml
@@ -6,6 +6,8 @@ metadata:
   period: year
   label: Missouri property tax credit property-tax-to-total-rent ratio
   reference:
+    - title: 2025 MO-1040 Book - Individual Income Tax Long Form
+      href: https://dor.mo.gov/forms/MO-1040%20Instructions_2025.pdf#page=51
     - title: 2024 MO-1040 Book - Individual Income Tax Long Form
       href: https://dor.mo.gov/forms/MO-1040%20Instructions_2024.pdf#page=51
     - title: 2023 Form MO-CRP, Line 9

diff --git a/..._us/parameters/gov/states/mo/tax/income/credits/property_tax/rent_property_tax_limit.yaml b/..._us/parameters/gov/states/mo/tax/income/credits/property_tax/rent_property_tax_limit.yaml
@@ -6,6 +6,8 @@ metadata:
   period: year
   label: Missouri property tax credit limit for property renters
   reference:
+    - title: 2025 MO-PTC Property Tax Credit Claim
+      href: https://dor.mo.gov/forms/MO-PTC%20Instructions_2025.pdf#page=2
     - title: MO-PTS 2024 Property Tax Credit Schedule, Line 12
       href: https://dor.mo.gov/forms/MO-PTS_2024.pdf#page=2
     - title: 2023 MO-PTS Property Tax Credit Schedule, Line 12

diff --git a/policyengine_us/parameters/gov/states/mo/tax/income/credits/wftc/match.yaml b/policyengine_us/parameters/gov/states/mo/tax/income/credits/wftc/match.yaml
@@ -16,3 +16,5 @@ metadata:
       href: https://dor.mo.gov/taxation/individual/tax-types/income/year-changes/
     - title: 2024 MO-1040 Book - Individual Income Tax Long Form
       href: https://dor.mo.gov/forms/MO-1040%20Instructions_2024.pdf#page=10
+    - title: 2025 MO-1040 Book - Individual Income Tax Long Form
+      href: https://dor.mo.gov/forms/MO-1040%20Instructions_2025.pdf#page=10
diff --git a/policyengine_us/parameters/gov/states/mo/tax/income/deductions/business_income/rate.yaml b/policyengine_us/parameters/gov/states/mo/tax/income/deductions/business_income/rate.yaml
@@ -7,6 +7,8 @@ metadata:
   period: year
   label: Missouri business income deduction rate
   reference:
+    - title: 2025 MO-1040 Book - Individual Income Tax Long Form, Line 17
+      href: https://dor.mo.gov/forms/MO-1040%20Instructions_2025.pdf#page=16
     - title: 2024 MO-1040 Book - Individual Income Tax Long Form, Line 17
       href: https://dor.mo.gov/forms/MO-1040%20Instructions_2024.pdf#page=16
     - title: 2023 Form MO-1040, Line 17

diff --git a/policyengine_us/parameters/gov/states/mo/tax/income/deductions/federal_income_tax/cap.yaml b/policyengine_us/parameters/gov/states/mo/tax/income/deductions/federal_income_tax/cap.yaml
@@ -14,10 +14,12 @@ metadata:
   period: year
   label: Missouri federal income tax deduction caps
   reference:
-    - title: 2021 Missouri Form MO-1040 Individual Income Tax Long Form Instructions
-      href: https://dor.mo.gov/forms/MO-1040%20Instructions_2021.pdf
+    - title: 2025 MO-1040 Book - Individual Income Tax Long Form, Line 13
+      href: https://dor.mo.gov/forms/MO-1040%20Instructions_2025.pdf#page=8
     - title: 2024 MO-1040 Book - Individual Income Tax Long Form, Line 13
       href: https://dor.mo.gov/forms/MO-1040%20Instructions_2024.pdf#page=8
+    - title: 2021 Missouri Form MO-1040 Individual Income Tax Long Form Instructions
+      href: https://dor.mo.gov/forms/MO-1040%20Instructions_2021.pdf
     - title: Revisor of Missouri Title X TAXATION AND REVENUE Chapter 143.171
       href: https://revisor.mo.gov/main/OneSection.aspx?section=143.171&bid=49937&hl=federal+income+tax+deduction%u2044
   breakdown:

diff --git a/policyengine_us/parameters/gov/states/mo/tax/income/deductions/mo_max_private_pension.yaml b/policyengine_us/parameters/gov/states/mo/tax/income/deductions/mo_max_private_pension.yaml
@@ -6,7 +6,9 @@ metadata:
   period: year
   label: Missouri maximum private pension amount
   reference:
-    - title: Revisor of Missouri Title X TAXATION AND REVENUE Chapter 143.124
-      href: https://revisor.mo.gov/main/OneSection.aspx?section=143.124
+    - title: 2025 MO-1040 Book - Individual Income Tax Long Form
+      href: https://dor.mo.gov/forms/MO-1040%20Instructions_2025.pdf#page=29
     - title: 2024 Form MO-A - Individual Income Tax Adjustments, Part 3 - Section B
       href: https://dor.mo.gov/forms/MO-A_2024.pdf#page=3
+    - title: Revisor of Missouri Title X TAXATION AND REVENUE Chapter 143.124
+      href: https://revisor.mo.gov/main/OneSection.aspx?section=143.124
diff --git a/...arameters/gov/states/mo/tax/income/deductions/mo_private_pension_deduction_allowance.yaml b/...arameters/gov/states/mo/tax/income/deductions/mo_private_pension_deduction_allowance.yaml
@@ -14,12 +14,14 @@ metadata:
   period: year
   label: Missouri private pension deduction allowance
   reference:
+    - title: 2025 MO-1040 Book - Individual Income Tax Long Form
+      href: https://dor.mo.gov/forms/MO-1040%20Instructions_2025.pdf#page=29
+    - title: 2024 Form MO-A - Individual Income Tax Adjustments, Part 3 - Section B
+      href: https://dor.mo.gov/forms/MO-A_2024.pdf#page=3
     - title: 2021 Individual Income Tax Long Form MO-1040 Instructions
       href: https://dor.mo.gov/forms/MO-1040%20Instructions_2021.pdf#page=3
     - title: 2021 Individual Income Tax Long Form MO-1040
       href: https://dor.mo.gov/forms/MO-1040%20Fillable%20Calculating_2021.pdf#page=2
-    - title: 2024 Form MO-A - Individual Income Tax Adjustments, Part 3 - Section B
-      href: https://dor.mo.gov/forms/MO-A_2024.pdf#page=3
     - title: Revisor of Missouri Title X TAXATION AND REVENUE Chapter 143.124
       href: https://revisor.mo.gov/main/OneSection.aspx?section=143.124
   breakdown:

diff --git a/...mo/tax/income/deductions/social_security_and_public_pension/income_threshold_applies.yaml b/...mo/tax/income/deductions/social_security_and_public_pension/income_threshold_applies.yaml
@@ -4,11 +4,13 @@ metadata:
   period: year
   label: Missouri social security and public pension income thresholds apply 
   reference:
+    - title: 2025 MO-1040 Book - Individual Income Tax Long Form
+      href: https://dor.mo.gov/forms/MO-1040%20Instructions_2025.pdf#page=29
+    - title: 2024 MO-1040 Book - Individual Income Tax Long Form
+      href: https://dor.mo.gov/forms/MO-1040%20Instructions_2024.pdf#page=29
     - title: 2023 MO-1040 Book - Individual Income Tax Long Form
       href: https://dor.mo.gov/forms/MO-1040%20Instructions_2023.pdf#page=29
       # Income thresholds removed in 2024.
-    - title: 2024 MO-1040 Book - Individual Income Tax Long Form
-      href: https://dor.mo.gov/forms/MO-1040%20Instructions_2024.pdf#page=29
     - title: MO Statute - Chapter 143.125, Subsection 2
       href: https://revisor.mo.gov/main/OneSection.aspx?section=143.125
 

diff --git a/.../income/deductions/social_security_and_public_pension/mo_max_social_security_benefit.yaml b/.../income/deductions/social_security_and_public_pension/mo_max_social_security_benefit.yaml
@@ -5,21 +5,26 @@ values:
   2022-01-01: 41_373
   2023-01-01: 44_683
   2024-01-01: 46_381
+  2025-01-01: 48_216
 metadata:
   uprating: gov.irs.uprating
   unit: currency-USD
   period: year
   label: Missouri max social security benefit
   reference:
-    - title: 2020 Individual Income Tax Adjustments Form MO-A
-      href: https://dor.mo.gov/forms/MO-A_2020.pdf#page=3
-    - title: 2021 Individual Income Tax Adjustments Form MO-A
-      href: https://dor.mo.gov/forms/MO-A_2021.pdf#page=3
-    - title: Form MO-A 2022
-      href: https://dor.mo.gov/forms/MO-A_2022.pdf#page=3
-    - title: Form MO-A 2023
-      href: https://dor.mo.gov/forms/MO-A_2023.pdf#page=3
+    - title: 2025 MO-1040 Book - Individual Income Tax Long Form
+      href: https://dor.mo.gov/forms/MO-1040%20Instructions_2025.pdf#page=29
+    - title: SSA Maximum Benefit Examples 2025
+      href: https://www.ssa.gov/oact/cola/examplemax.html
     - title: 2024 Form MO-A - Individual Income Tax Adjustments, Part 3 - Section A
       href: https://dor.mo.gov/forms/MO-A_2024.pdf#page=3
+    - title: Form MO-A 2023
+      href: https://dor.mo.gov/forms/MO-A_2023.pdf#page=3
+    - title: Form MO-A 2022
+      href: https://dor.mo.gov/forms/MO-A_2022.pdf#page=3
+    - title: 2021 Individual Income Tax Adjustments Form MO-A
+      href: https://dor.mo.gov/forms/MO-A_2021.pdf#page=3
+    - title: 2020 Individual Income Tax Adjustments Form MO-A
+      href: https://dor.mo.gov/forms/MO-A_2020.pdf#page=3
     - title: MO Revisor 143.124
       href: https://revisor.mo.gov/main/OneSection.aspx?section=143.124
diff --git a/.../deductions/social_security_and_public_pension/mo_public_pension_deduction_allowance.yaml b/.../deductions/social_security_and_public_pension/mo_public_pension_deduction_allowance.yaml
@@ -14,6 +14,8 @@ metadata:
   period: year
   label: Missouri Public Pension Deduction Allowance
   reference:
+    - title: 2025 MO-1040 Book - Individual Income Tax Long Form
+      href: https://dor.mo.gov/forms/MO-1040%20Instructions_2025.pdf#page=29
     - title: 2021 Form MO-1040 Individual Income Tax Long Form Instructions
       href: https://dor.mo.gov/forms/MO-1040%20Instructions_2021.pdf#page=3
     - title: 2021 Form MO-1040 Individual Income Tax Long Form

diff --git a/...ncome/deductions/social_security_and_public_pension/mo_ss_or_ssd_deduction_allowance.yaml b/...ncome/deductions/social_security_and_public_pension/mo_ss_or_ssd_deduction_allowance.yaml
@@ -14,6 +14,8 @@ metadata:
   period: year
   label: Missouri social security or social security disability deduction allowance
   reference:
+    - title: 2025 MO-1040 Book - Individual Income Tax Long Form
+      href: https://dor.mo.gov/forms/MO-1040%20Instructions_2025.pdf#page=29
     - title: 2021 Form MO-1040 Individual Income Tax Long Form Instructions
       href: https://dor.mo.gov/forms/MO-1040%20Instructions_2021.pdf#page=3
     - title: 2021 Form MO-1040 Individual Income Tax Long Form

diff --git a/...come/deductions/social_security_and_public_pension/mo_ss_or_ssdi_exemption_threshold.yaml b/...come/deductions/social_security_and_public_pension/mo_ss_or_ssdi_exemption_threshold.yaml
@@ -14,6 +14,8 @@ metadata:
   period: year
   label: Missouri social security or social security disability income exemption threshold
   reference:
+    - title: 2025 MO-1040 Book - Individual Income Tax Long Form
+      href: https://dor.mo.gov/forms/MO-1040%20Instructions_2025.pdf#page=29
     - title: 2021 Form MO-1040 Individual Income Tax Long Form
       href: https://dor.mo.gov/forms/MO-A_2021.pdf#page=3
     - title: 2021 Form MO-1040 Individual Income Tax Long Form Instructions

diff --git a/policyengine_us/parameters/gov/states/mo/tax/income/minimum_taxable_income.yaml b/policyengine_us/parameters/gov/states/mo/tax/income/minimum_taxable_income.yaml
@@ -14,9 +14,11 @@ metadata:
     - title: Missouri Department of Revenue 2025 Individual Income Tax Year Changes (This reference should be updated once the 2025 tax form comes out)
       href: https://dor.mo.gov/taxation/individual/tax-types/income/year-changes/
     - title: Missouri Legal Code | 143.021.  Tax determined by rates in section 143.011 — no tax on taxable income, when.
-      href: https://rezvisor.mo.gov/main/OneSection.aspx?section=143.021
+      href: https://revisor.mo.gov/main/OneSection.aspx?section=143.021
     - title: 2024 MO-1040 Book - Individual Income Tax Long Form
       href: https://dor.mo.gov/forms/MO-1040%20Instructions_2024.pdf#page=26
+    - title: 2025 MO-1040 Book - Individual Income Tax Long Form
+      href: https://dor.mo.gov/forms/MO-1040%20Instructions_2025.pdf#page=26
     - title: 2023 Individual Income Tax Long Form MO-1040 Instructions
       href: https://dor.mo.gov/forms/MO-1040%20Instructions_2023.pdf#page=26
     - title: 2022 Individual Income Tax Long Form MO-1040 Instructions

diff --git a/policyengine_us/parameters/gov/states/mo/tax/income/rates.yaml b/policyengine_us/parameters/gov/states/mo/tax/income/rates.yaml
@@ -139,6 +139,8 @@ metadata:
       href: https://dor.mo.gov/forms/MO-1040%20Instructions_2022.pdf#page=26
     - title: 2024 MO-1040 Book - Individual Income Tax Long Form
       href: https://dor.mo.gov/forms/MO-1040%20Instructions_2024.pdf#page=26
+    - title: 2025 MO-1040 Book - Individual Income Tax Long Form
+      href: https://dor.mo.gov/forms/MO-1040%20Instructions_2025.pdf#page=26
     - title: Missouri Legal Code, Chapter 143.011.  Resident individuals — tax rates — rate reductions, when.
       href: https://revisor.mo.gov/main/OneSection.aspx?section=143.011&bid=51511&hl=
     - title: 2025 Missouri Withholding Tax Formula

diff --git a/policyengine_us/parameters/gov/states/mo/tax/income/subtractions/agi_subtractions.yaml b/policyengine_us/parameters/gov/states/mo/tax/income/subtractions/agi_subtractions.yaml
@@ -16,3 +16,5 @@ metadata:
       href: https://www.revisor.mo.gov/main/OneSection.aspx?bid=50493&section=143.121
     - title: Revisor of Missouri, Title X Taxation and Revenue, Chapter 143, 143.121, Missouri adjusted gross income (8/28/2025)
       href: https://www.revisor.mo.gov/main/OneSection.aspx?section=143.121&bid=57543
+    - title: 2025 MO-1040 Book - Individual Income Tax Long Form
+      href: https://dor.mo.gov/forms/MO-1040%20Instructions_2025.pdf#page=12
diff --git a/policyengine_us/parameters/gov/states/mo/tax/income/subtractions/net_capital_gain/rate.yaml b/policyengine_us/parameters/gov/states/mo/tax/income/subtractions/net_capital_gain/rate.yaml
@@ -12,3 +12,5 @@ metadata:
     href: https://www.senate.mo.gov/25info/bts_web/bill.aspx?SessionType=R&BillID=4957943
   - title: MO Dept of Revenue, Capital Gains Subtraction FAQs
     href: https://dor.mo.gov/faq/taxation/individual/capital-gains-subtraction.html
+  - title: 2025 MO-1040 Book - Individual Income Tax Long Form
+    href: https://dor.mo.gov/forms/MO-1040%20Instructions_2025.pdf#page=12
diff --git a/policyengine_us/tests/policy/baseline/gov/states/mo/tax/income/income_tax/integration.yaml b/policyengine_us/tests/policy/baseline/gov/states/mo/tax/income/income_tax/integration.yaml
@@ -67,3 +67,33 @@
         state_code: MO
   output:  # expected results from TAXSIM35
     mo_income_tax: 884.03
+
+- name: Single filer with $50,000 taxable income in 2025
+  # Tests 2025 tax brackets:
+  # $0-$1,313: $0 (0%)
+  # $1,313-$2,626: $26.26 (2% of $1,313)
+  # $2,626-$3,939: $32.83 (2.5% of $1,313)
+  # $3,939-$5,252: $39.39 (3% of $1,313)
+  # $5,252-$6,565: $45.96 (3.5% of $1,313)
+  # $6,565-$7,878: $52.52 (4% of $1,313)
+  # $7,878-$9,191: $59.09 (4.5% of $1,313)
+  # $9,191-$50,000: $1,918.02 (4.7% of $40,809)
+  # Total: $2,174.07 (rounded to $2,174)
+  period: 2025
+  absolute_error_margin: 1
+  input:
+    people:
+      person1:
+        is_tax_unit_head: true
+        age: 40
+        mo_taxable_income: 50_000
+    tax_units:
+      tax_unit:
+        members: [person1]
+        mo_non_refundable_credits: 0
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    mo_income_tax: 2_174
diff --git a/...s/policy/baseline/gov/states/mo/tax/income/subtractions/mo_capital_gains_subtraction.yaml b/...s/policy/baseline/gov/states/mo/tax/income/subtractions/mo_capital_gains_subtraction.yaml
@@ -63,3 +63,26 @@
     mo_capital_gains_subtraction: 10_000
     # Person level subtraction should be allocated by LTCG share
     mo_capital_gains_subtraction_person: [6_000, 4_000]
+
+- name: 2025 capital gains subtraction - 100% of LTCG
+  # In 2025, 100% of long-term capital gains are subtractable
+  period: 2025
+  absolute_error_margin: 0
+  input:
+    people:
+      person1:
+        long_term_capital_gains: 25_000
+        short_term_capital_gains: 5_000
+    tax_units:
+      tax_unit1:
+        members: [person1]
+        tax_unit_itemizes: false
+        taxable_income: 150_000
+    households:
+      household1:
+        members: [person1]
+        state_code: MO
+  output:
+    # 100% of long-term capital gains ($25,000) subtracted
+    # Short-term capital gains are NOT eligible for subtraction
+    mo_capital_gains_subtraction: 25_000