diff --git a/policyengine_us/parameters/gov/states/mo/tax/income/credits/non_refundable.yaml b/policyengine_us/parameters/gov/states/mo/tax/income/credits/non_refundable.yaml
index 3537931a656..07b48ce9eb1 100644
--- a/policyengine_us/parameters/gov/states/mo/tax/income/credits/non_refundable.yaml
+++ b/policyengine_us/parameters/gov/states/mo/tax/income/credits/non_refundable.yaml
@@ -1,7 +1,8 @@
 description: Missouri allows these non-refundable tax credits.
 values:
-  2020-01-01:
-  - mo_wftc
+  2020-01-01: []
+  2023-01-01:
+    -mo_wftc
 metadata:
   unit: list
   label: Missouri non-refundable tax credits
diff --git a/policyengine_us/parameters/gov/states/mo/tax/income/deductions/mo_max_business_income_deduction.yaml b/policyengine_us/parameters/gov/states/mo/tax/income/deductions/mo_max_business_income_deduction.yaml
new file mode 100644
index 00000000000..5cefac750c3
--- /dev/null
+++ b/policyengine_us/parameters/gov/states/mo/tax/income/deductions/mo_max_business_income_deduction.yaml
@@ -0,0 +1,14 @@
+description: mo_max_business_income_deduction.yaml
+values:
+  2022-01-01: 0.15
+  2023-01-01: 0.20
+metadata:
+  unit: currency-USD
+  period: year
+  name: mo_max_business_income_deduction
+  label: Missouri Maximum Business Income Deduction
+  reference:
+    - title: 2023 Form MO-1040, Line 17
+      href: https://dor.mo.gov/forms/MO-1040%20Instructions_2023.pdf#page=16
+    - title: 2022 Form MO-1040, Line 17
+      href: https://dor.mo.gov/forms/MO-1040%20Instructions_2022.pdf#page=16
diff --git a/policyengine_us/parameters/gov/states/mo/tax/income/rates.yaml b/policyengine_us/parameters/gov/states/mo/tax/income/rates.yaml
index 86f973c637f..f6c73449669 100644
--- a/policyengine_us/parameters/gov/states/mo/tax/income/rates.yaml
+++ b/policyengine_us/parameters/gov/states/mo/tax/income/rates.yaml
@@ -72,7 +72,7 @@ brackets:
       2020-01-01: 8_584
       2021-01-01: 8_704
       2022-01-01: 8_968
-      # 2023-01-01: 8_449
+      2023-01-01: .inf
 
 metadata:
   reference:
diff --git a/policyengine_us/tests/policy/baseline/gov/states/mo/tax/income/deductions/mo_business_income_deduction.yaml b/policyengine_us/tests/policy/baseline/gov/states/mo/tax/income/deductions/mo_business_income_deduction.yaml
new file mode 100644
index 00000000000..f7f213c8b79
--- /dev/null
+++ b/policyengine_us/tests/policy/baseline/gov/states/mo/tax/income/deductions/mo_business_income_deduction.yaml
@@ -0,0 +1,31 @@
+- name: 2023 non-zero qualified business income
+  period: 2023
+  input:
+    qualified_business_income: 10_000
+    state_code: MO
+  output:
+    mo_business_income_deduction: 2_000
+
+- name: 2023 zero qualified business income
+  period: 2023
+  input:
+    qualified_business_income: 0
+    state_code: MO
+  output:
+    mo_business_income_deduction: 0
+
+- name: 2022 non-zero qualified business income
+  period: 2022
+  input:
+    qualified_business_income: 10_000
+    state_code: MO
+  output:
+    mo_business_income_deduction: 1_500
+
+- name: 2022 zero qualified business income
+  period: 2022
+  input:
+    qualified_business_income: 0
+    state_code: MO
+  output:
+    mo_business_income_deduction: 0
diff --git a/policyengine_us/variables/gov/states/mo/tax/income/credits/mo_wftc.py b/policyengine_us/variables/gov/states/mo/tax/income/credits/mo_wftc.py
index 73d75fc1160..fcf775cd7ec 100644
--- a/policyengine_us/variables/gov/states/mo/tax/income/credits/mo_wftc.py
+++ b/policyengine_us/variables/gov/states/mo/tax/income/credits/mo_wftc.py
@@ -10,7 +10,7 @@ class mo_wftc(Variable):
     reference = "https://revisor.mo.gov/main/OneSection.aspx?section=143.177&bid=49978&hl="
     defined_for = StateCode.MO
 
-    def formula(tax_unit, period, parameters):
+    def formula_2023(tax_unit, period, parameters):
         federal_eitc = tax_unit("eitc", period)
         rate = parameters(
             period
diff --git a/policyengine_us/variables/gov/states/mo/tax/income/deductions/mo_business_income_deduction.py b/policyengine_us/variables/gov/states/mo/tax/income/deductions/mo_business_income_deduction.py
new file mode 100644
index 00000000000..cb0fc3a844d
--- /dev/null
+++ b/policyengine_us/variables/gov/states/mo/tax/income/deductions/mo_business_income_deduction.py
@@ -0,0 +1,23 @@
+from policyengine_us.model_api import *
+
+
+class mo_business_income_deduction(Variable):
+    value_type = float
+    entity = TaxUnit
+    label = "MO business income deduction"
+    unit = USD
+    definition_period = YEAR
+    reference = (
+        "https://dor.mo.gov/forms/MO-1040%20Instructions_2023.pdf#page=16",
+        "https://revisor.mo.gov/main/OneSection.aspx?section=143.022",
+    )
+    defined_for = StateCode.MO
+
+    def formula(tax_unit, period, parameters):
+        p = parameters(
+            period
+        ).gov.states.mo.tax.income.deductions.mo_max_business_income_deduction
+        qualified_business_income = tax_unit(
+            "qualified_business_income", period
+        )
+        return p * qualified_business_income