diff --git a/changelog_entry.yaml b/changelog_entry.yaml
index e69de29bb2d..d31ff145aec 100644
--- a/changelog_entry.yaml
+++ b/changelog_entry.yaml
@@ -0,0 +1,8 @@
+- bump: minor
+  changes:
+    added:
+    - Colorado 2024 tax form references.
+    - 2023 and 2024 Colorado Income Qualified Senior Housing Credit.
+    - 2024 Colorado ABLE Account Cap.
+    - 2023 and 2024 Colorado CollegeInvest Maximum Amount.
+    - 2024 Colorado State Sales Tax Refund.
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/age_threshold.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/age_threshold.yaml
index d8ca8b19b38..0f9b5246163 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/age_threshold.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/age_threshold.yaml
@@ -11,14 +11,14 @@ metadata:
       href: https://advance.lexis.com/documentpage/?pdmfid=1000516&crid=4f86a852-765a-489a-b554-66f6e7d5b065&nodeid=ABPAACAACAABAACABN&nodepath=%2fROOT%2fABP%2fABPAAC%2fABPAACAAC%2fABPAACAACAAB%2fABPAACAACAABAAC%2fABPAACAACAABAACABN&level=6&haschildren=&populated=false&title=39-22-129.+Child+tax+credit+-+legislative+declaration+-+definitions.&config=014FJAAyNGJkY2Y4Zi1mNjgyLTRkN2YtYmE4OS03NTYzNzYzOTg0OGEKAFBvZENhdGFsb2d592qv2Kywlf8caKqYROP5&pddocfullpath=%2fshared%2fdocument%2fstatutes-legislation%2furn%3acontentItem%3a633G-B1C3-GXJ9-30GW-00008-00&ecomp=7gf59kk&prid=2fe6fa8e-8df8-4d74-a340-c4fa9bc603d5
     - title: 2022 Colorado Child Tax Credit
       href: https://tax.colorado.gov/sites/tax/files/documents/DR_0104CN_2022.pdf#page=1
-    - title: Colorado Individual Income Tax Filing Guide - Instructions for Select Credits from the DR 0104CR - Line 1 Child Tax Credit
+    - title: 2021 Colorado Individual Income Tax Filing Guide
+      href: https://tax.colorado.gov/sites/tax/files/documents/DR0104Book_2021_V3.pdf#page=15
+    - title: 2022 Colorado Individual Income Tax Filing Guide - Instructions for Select Credits from the DR 0104CR - Line 1 Child Tax Credit
       href: https://tax.colorado.gov/sites/tax/files/documents/DR_104_Book_2022.pdf#page=16
     - title: 2023 Colorado Individual Tax Filing Guide 104 Book, Line 1
       href: https://tax.colorado.gov/sites/tax/files/documents/Book0104_2023.pdf#page=18
     - title: 2023 Colorado Child Tax Credit, Applicable Percentage Table
       href: https://tax.colorado.gov/sites/tax/files/documents/DR0104CN_2023.pdf#page=1
-    - title: 2021 Colorado Individual Income Tax Filing Guide
-      href: https://tax.colorado.gov/sites/tax/files/documents/DR0104Book_2021_V3.pdf#page=15
     - title: 2024 Colorado Child Tax Credit Instructions, Section B
       href: https://tax.colorado.gov/sites/tax/files/documents/DR_0104CN_2024.pdf#page=2
       # Colorado introduced the child tax credit in 2022.
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/sales_tax_refund/age_threshold.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/sales_tax_refund/age_threshold.yaml
index bac55ba34ee..8deef7c6723 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/credits/sales_tax_refund/age_threshold.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/credits/sales_tax_refund/age_threshold.yaml
@@ -9,7 +9,9 @@ metadata:
   reference:
   - title: Colo. Code Regs. 39-22-2003 State Sales Tax Refund (1) (a) (II)
     href: https://law.justia.com/codes/colorado/2022/title-39/article-22/part-20/section-39-22-2003/
-  - title: 2022 Colorado Individual Income Tax Filing Guide
-    href: https://tax.colorado.gov/sites/tax/files/documents/DR_0104_Book_2022.pdf#page=23
   - title: 2021 Colorado Individual Income Tax Filing Guide
     href: https://tax.colorado.gov/sites/tax/files/documents/DR_104_Book_2021.pdf#page=21
+  - title: 2022 Colorado Individual Income Tax Filing Guide
+    href: https://tax.colorado.gov/sites/tax/files/documents/DR_0104_Book_2022.pdf#page=23
+  - title: 2024 Colorado State Sales Tax Refund
+    href: https://tax.colorado.gov/income-tax-topics-state-sales-tax-refund
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/sales_tax_refund/amount/flat_amount_enabled.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/sales_tax_refund/amount/flat_amount_enabled.yaml
index 74394ab11fa..440eabd19e2 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/credits/sales_tax_refund/amount/flat_amount_enabled.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/credits/sales_tax_refund/amount/flat_amount_enabled.yaml
@@ -2,14 +2,17 @@ description: Colorado allows for a flat sales tax refund credit if this is true.
 values:
   2021-01-01: false
   2023-01-01: true
+  2024-01-01: false
 metadata:
   period: year
   unit: bool
   label: Colorado sales tax refund credit flat amount enabled
   reference:
-    - title: 2023 Colorado Individual Income Tax Filing Guide
-      href: https://leg.colorado.gov/sites/default/files/documents/2023A/bills/fn/2023a_hb1311_00.pdf#page=3
     - title: 2022 Colorado Individual Income Tax Filing Guide
       href: https://tax.colorado.gov/sites/tax/files/documents/DR_0104_Book_2022.pdf#page=23
+    - title: 2023 Colorado Individual Income Tax Filing Guide
+      href: https://leg.colorado.gov/sites/default/files/documents/2023A/bills/fn/2023a_hb1311_00.pdf#page=3
+    - title: 2024 Colorado State Sales Tax Refund
+      href: https://tax.colorado.gov/income-tax-topics-state-sales-tax-refund
     - title: Colorado General Assembly HB23-1311 Identical Temporary TABOR Refund
       href: https://leg.colorado.gov/bills/hb23-1311#:~:text=The%20act%20creates%20a%20new,2022%2D23%20state%20fiscal%20year
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/sales_tax_refund/amount/multiplier.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/sales_tax_refund/amount/multiplier.yaml
index da0e55bc61e..c61a3500c54 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/credits/sales_tax_refund/amount/multiplier.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/credits/sales_tax_refund/amount/multiplier.yaml
@@ -6,10 +6,12 @@ metadata:
   reference:
     - title: Colo. Code Regs. 39-22-2003 State Sales Tax Refund (3), (b)
       href: https://law.justia.com/codes/colorado/2022/title-39/article-22/part-20/section-39-22-2003/
-    - title: 2022 Colorado Individual Income Tax Filing Guide
-      href: https://tax.colorado.gov/sites/tax/files/documents/DR_0104_Book_2022.pdf#page=23
     - title: 2021 Colorado Individual Income Tax Filing Guide
       href: https://tax.colorado.gov/sites/tax/files/documents/DR_104_Book_2021.pdf#page=21
+    - title: 2022 Colorado Individual Income Tax Filing Guide
+      href: https://tax.colorado.gov/sites/tax/files/documents/DR_0104_Book_2022.pdf#page=23
+    - title: 2024 Colorado State Sales Tax Refund
+      href: https://tax.colorado.gov/income-tax-topics-state-sales-tax-refund
   breakdown:
     - filing_status
 
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/sales_tax_refund/amount/scale.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/sales_tax_refund/amount/scale.yaml
index f3980ebefc7..c50d2343739 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/credits/sales_tax_refund/amount/scale.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/credits/sales_tax_refund/amount/scale.yaml
@@ -8,15 +8,17 @@ metadata:
   reference:
     - title: Colo. Code Regs. 39-22-2003 State Sales Tax Refund (1), (b)
       href: https://casetext.com/regulation/colorado-administrative-code/department-200-department-of-revenue/division-201-taxation-division/rule-1-ccr-201-2-income-tax/rule-39-22-2003-effective-until-8302023-state-sales-tax-refund
-    # In 2023 Colorado switched to a flat amount as opposed to a scale based on income.
+    - title: 2021 Colorado Individual Income Tax Filing Guide
+      href: https://tax.colorado.gov/sites/tax/files/documents/DR_104_Book_2021.pdf#page=21
+    - title: 2022 Colorado Individual Income Tax Filing Guide
+      href: https://tax.colorado.gov/sites/tax/files/documents/DR_0104_Book_2022.pdf#page=23
+# In 2023 Colorado switched to a flat amount as opposed to a scale based on income.
     - title: 2023 Colorado Individual Income Tax Filing Guide
       href: https://leg.colorado.gov/sites/default/files/documents/2023A/bills/fn/2023a_hb1311_00.pdf#page=3
     - title: Colorado General Assembly HB23-1311 Identical Temporary TABOR Refund
       href: https://leg.colorado.gov/bills/hb23-1311#:~:text=The%20act%20creates%20a%20new,2022%2D23%20state%20fiscal%20year
-    - title: 2022 Colorado Individual Income Tax Filing Guide
-      href: https://tax.colorado.gov/sites/tax/files/documents/DR_0104_Book_2022.pdf#page=23
-    - title: 2021 Colorado Individual Income Tax Filing Guide
-      href: https://tax.colorado.gov/sites/tax/files/documents/DR_104_Book_2021.pdf#page=21
+    - title: 2024 Colorado State Sales Tax Refund
+      href: https://tax.colorado.gov/income-tax-topics-state-sales-tax-refund
 brackets:
   - threshold:
       2021-01-01: 0
@@ -24,39 +26,50 @@ brackets:
       2021-01-01: 37
       2022-01-01: 153
       2023-01-01: 0
+      2024-01-01: 177
   - threshold:
       2021-01-01: 44_001
       2022-01-01: 48_001
+      2024-01-01: 53_001
     amount:
       2021-01-01: 49
       2022-01-01: 208
       2023-01-01: 0
+      2024-01-01: 240
   - threshold:
       2021-01-01: 88_001
       2022-01-01: 95_001
+      2024-01-01: 105_001
     amount:
       2021-01-01: 56
       2022-01-01: 234
       2023-01-01: 0
+      2024-01-01: 277
   - threshold:
       2021-01-01: 139_001
       2022-01-01: 151_001
+      2024-01-01: 166_001
     amount:
       2021-01-01: 68
       2022-01-01: 285
       2023-01-01: 0
+      2024-01-01: 323
   - threshold:
       2021-01-01: 193_001
       2022-01-01: 209_001
+      2024-01-01: 233_001
     amount:
       2021-01-01: 74
       2022-01-01: 300
       2023-01-01: 0
+      2024-01-01: 350
   - threshold:
       2021-01-01: 246_001
       2022-01-01: 268_001
+      2024-01-01: 302_001
     amount:
       2021-01-01: 117
       2022-01-01: 486
       2023-01-01: 0
+      2024-01-01: 565
 
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/sales_tax_refund/magi_sources.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/sales_tax_refund/magi_sources.yaml
index 65ab0a5d00e..68631ff6a42 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/credits/sales_tax_refund/magi_sources.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/credits/sales_tax_refund/magi_sources.yaml
@@ -15,4 +15,5 @@ metadata:
     href: https://tax.colorado.gov/sites/tax/files/documents/DR_104_Book_2021.pdf#page=21
   - title: 2022 Colorado Individual Income Tax Filing Guide
     href: https://tax.colorado.gov/sites/tax/files/documents/DR_0104_Book_2022.pdf#page=23
-
+  - title: 2024 Colorado State Sales Tax Refund
+    href: https://tax.colorado.gov/income-tax-topics-state-sales-tax-refund
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/subtractions/able_contribution/cap.yaml b/policyengine_us/parameters/gov/states/co/tax/income/subtractions/able_contribution/cap.yaml
index e7670a294e5..af1bc792176 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/subtractions/able_contribution/cap.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/subtractions/able_contribution/cap.yaml
@@ -6,19 +6,25 @@ metadata:
   breakdown:
     - filing_status
   reference:
-    - title: 2023 Colorado Individual Tax Filing Guide 104 Book 
+    - title: 2023 Colorado Individual Tax Filing Guide 104 Book - Subtractions Line 11
       href: https://tax.colorado.gov/sites/tax/files/documents/Book0104_2023.pdf#page=14
+    - title: 2024 Colorado Individual Tax Filing Guide 104 Book - Subtractions Line 11
+      href: https://tax.colorado.gov/sites/tax/files/documents/DR0104_book_2024.pdf#page=20
     - title: C.R.S. 39-22-104(4)(i)(II)(B)
       href: https://advance.lexis.com/documentpage/?pdmfid=1000516&crid=28da6d1b-814f-4ace-b369-4a0d0233db83&config=014FJAAyNGJkY2Y4Zi1mNjgyLTRkN2YtYmE4OS03NTYzNzYzOTg0OGEKAFBvZENhdGFsb2d592qv2Kywlf8caKqYROP5&pddocfullpath=%2Fshared%2Fdocument%2Fstatutes-legislation%2Furn%3AcontentItem%3A689J-29B3-GXF6-81G9-00008-00&pdcontentcomponentid=234176&pdteaserkey=sr2&pditab=allpods&ecomp=bs65kkk&earg=sr2&prid=a5cd01c5-3332-4547-a3ff-d2bd6bcc868f
 
 JOINT:
   2023-01-01: 31_000
+  2024-01-01: 34_000
 SINGLE:
   2023-01-01: 20_700
+  2024-01-01: 22_700
 SURVIVING_SPOUSE:
   2023-01-01: 20_700
+  2024-01-01: 22_700
 HEAD_OF_HOUSEHOLD:
   2023-01-01: 20_700
+  2024-01-01: 22_700
 SEPARATE:
   2023-01-01: 20_700
-
+  2024-01-01: 22_700
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/subtractions/charitable_contribution/adjustment.yaml b/policyengine_us/parameters/gov/states/co/tax/income/subtractions/charitable_contribution/adjustment.yaml
index b8b677665c7..26ebbef6bf9 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/subtractions/charitable_contribution/adjustment.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/subtractions/charitable_contribution/adjustment.yaml
@@ -7,11 +7,13 @@ metadata:
   period: year
   label: Colorado charitable contributions subtraction adjustment
   reference:
-    - title: 2022 Colorado Individual Tax Filing Guide 104 Book 
-      href: https://tax.colorado.gov/sites/tax/files/documents/DR_104_Book_2022.pdf#page=12
     - title: C.R.S. 39-22-104(4)(m)(1)
       href: https://casetext.com/regulation/colorado-administrative-code/department-200-department-of-revenue/division-201-taxation-division/rule-1-ccr-201-2-income-tax/rule-39-22-1044m-charitable-contribution-subtraction-for-taxpayers-claiming-the-federal-standard-deduction
     - title: 2021 Colorado Individual Tax Filing Guide 104 Book 
       href: https://tax.colorado.gov/sites/tax/files/documents/DR_104_Book_2021.pdf#page=12
-    - title: 2023 Colorado Individual Tax Filing Guide 104 Book 
+    - title: 2022 Colorado Individual Tax Filing Guide 104 Book 
+      href: https://tax.colorado.gov/sites/tax/files/documents/DR_104_Book_2022.pdf#page=12
+    - title: 2023 Colorado Individual Tax Filing Guide 104 Book - Subtractions Line 12
       href: https://tax.colorado.gov/sites/tax/files/documents/Book0104_2023.pdf#page=14
+    - title: 2024 Colorado Individual Tax Filing Guide 104 Book - Subtractions Line 12
+      href: https://tax.colorado.gov/sites/tax/files/documents/DR0104_book_2024.pdf#page=21
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/subtractions/collegeinvest_contribution/max_amount.yaml b/policyengine_us/parameters/gov/states/co/tax/income/subtractions/collegeinvest_contribution/max_amount.yaml
index 80a268f8c92..4aa31c8051f 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/subtractions/collegeinvest_contribution/max_amount.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/subtractions/collegeinvest_contribution/max_amount.yaml
@@ -9,19 +9,33 @@ metadata:
     # Subtraction amount is only specified in the Legal Code but not in the Tax Forms
     - title: C.R.S. 39-22-104(4)(j)(II)(B)
       href: https://law.justia.com/codes/colorado/2022/title-39/article-22/part-1/section-39-22-104/
+    - title: 2023 Colorado Individual Tax Filing Guide 104 Book - Subtractions Line 10
+      href: https://tax.colorado.gov/sites/tax/files/documents/Book0104_2023.pdf#page=13
+    - title: 2024 Colorado Individual Tax Filing Guide 104 Book - Subtractions Line 10
+      href: https://tax.colorado.gov/sites/tax/files/documents/DR0104_book_2024.pdf#page=20
 
 HEAD_OF_HOUSEHOLD:
   2021-01-01: .inf
   2022-01-01: 20_000
+  2023-01-01: 20_700
+  2024-01-01: 22_700
 JOINT:
   2021-01-01: .inf
   2022-01-01: 30_000
+  2023-01-01: 31_000
+  2024-01-01: 34_000
 SEPARATE:
   2021-01-01: .inf
   2022-01-01: 20_000
+  2023-01-01: 20_700
+  2024-01-01: 22_700
 SINGLE:
   2021-01-01: .inf
   2022-01-01: 20_000
+  2023-01-01: 20_700
+  2024-01-01: 22_700
 SURVIVING_SPOUSE:
   2021-01-01: .inf
   2022-01-01: 20_000
+  2023-01-01: 20_700
+  2024-01-01: 22_700
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/subtractions/military_retirement/age_threshold.yaml b/policyengine_us/parameters/gov/states/co/tax/income/subtractions/military_retirement/age_threshold.yaml
index bbf4b581323..2cc8f9c39c2 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/subtractions/military_retirement/age_threshold.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/subtractions/military_retirement/age_threshold.yaml
@@ -15,3 +15,5 @@ metadata:
       href: https://tax.colorado.gov/sites/tax/files/documents/DR_104_Book_2021.pdf#page=11
     - title: 2023 Colorado Individual Tax Filing Guide 104 Book - Subtractions Line 7
       href: https://tax.colorado.gov/sites/tax/files/documents/Book0104_2023.pdf#page=12
+    - title: 2024 Colorado Individual Tax Filing Guide 104 Book - Subtractions Line 7
+      href: https://tax.colorado.gov/sites/tax/files/documents/DR0104_book_2024.pdf#page=19
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/subtractions/military_retirement/max_amount.yaml b/policyengine_us/parameters/gov/states/co/tax/income/subtractions/military_retirement/max_amount.yaml
index 3a88ec5070c..e398e6fea9a 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/subtractions/military_retirement/max_amount.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/subtractions/military_retirement/max_amount.yaml
@@ -18,3 +18,5 @@ metadata:
       href: https://tax.colorado.gov/sites/tax/files/documents/DR_104_Book_2021.pdf#page=11
     - title: 2023 Colorado Individual Tax Filing Guide 104 Book - Subtractions Line 7
       href: https://tax.colorado.gov/sites/tax/files/documents/Book0104_2023.pdf#page=12
+    - title: 2024 Colorado Individual Tax Filing Guide 104 Book - Subtractions Line 7
+      href: https://tax.colorado.gov/sites/tax/files/documents/DR0104_book_2024.pdf#page=19
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/subtractions/pension/age_threshold/older.yaml b/policyengine_us/parameters/gov/states/co/tax/income/subtractions/pension/age_threshold/older.yaml
index 0ffe09ca057..2aba4feb4c5 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/subtractions/pension/age_threshold/older.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/subtractions/pension/age_threshold/older.yaml
@@ -13,5 +13,7 @@ metadata:
       href: https://tax.colorado.gov/sites/tax/files/documents/DR_104_Book_2021.pdf#page=11
     - title: 2023 Colorado Individual Tax Filing Guide 104 Book - Subtractions Line 4
       href: https://tax.colorado.gov/sites/tax/files/documents/Book0104_2023.pdf#page=12
+    - title: 2024 Colorado Individual Tax Filing Guide 104 Book - Subtractions Line 4
+      href: https://tax.colorado.gov/sites/tax/files/documents/DR0104_book_2024.pdf#page=18
     - title: C.R.S. 39-22-104(4)(g)(III)(B)
       href: https://law.justia.com/codes/colorado/2022/title-39/article-22/part-1/section-39-22-104/
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/subtractions/pension/age_threshold/younger.yaml b/policyengine_us/parameters/gov/states/co/tax/income/subtractions/pension/age_threshold/younger.yaml
index d303a77b5e6..4d3e913de5e 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/subtractions/pension/age_threshold/younger.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/subtractions/pension/age_threshold/younger.yaml
@@ -13,5 +13,7 @@ metadata:
       href: https://tax.colorado.gov/sites/tax/files/documents/DR_104_Book_2021.pdf#page=11
     - title: 2023 Colorado Individual Tax Filing Guide 104 Book - Subtractions Line 4
       href: https://tax.colorado.gov/sites/tax/files/documents/Book0104_2023.pdf#page=12
+    - title: 2024 Colorado Individual Tax Filing Guide 104 Book - Subtractions Line 4
+      href: https://tax.colorado.gov/sites/tax/files/documents/DR0104_book_2024.pdf#page=18
     - title: C.R.S. 39-22-104(4)(g)(I)
       href: https://law.justia.com/codes/colorado/2022/title-39/article-22/part-1/section-39-22-104/
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/subtractions/pension/cap/older.yaml b/policyengine_us/parameters/gov/states/co/tax/income/subtractions/pension/cap/older.yaml
index 5ab5d9741cf..8c896fe37b7 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/subtractions/pension/cap/older.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/subtractions/pension/cap/older.yaml
@@ -13,5 +13,7 @@ metadata:
       href: https://tax.colorado.gov/sites/tax/files/documents/DR_104_Book_2021.pdf#page=11
     - title: 2023 Colorado Individual Tax Filing Guide 104 Book - Subtractions Line 4
       href: https://tax.colorado.gov/sites/tax/files/documents/Book0104_2023.pdf#page=12
+    - title: 2024 Colorado Individual Tax Filing Guide 104 Book - Subtractions Line 4
+      href: https://tax.colorado.gov/sites/tax/files/documents/DR0104_book_2024.pdf#page=18
     - title: C.R.S. 39-22-104(4)(g)(III)(B)
       href: https://law.justia.com/codes/colorado/2022/title-39/article-22/part-1/section-39-22-104/
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/subtractions/pension/cap/younger.yaml b/policyengine_us/parameters/gov/states/co/tax/income/subtractions/pension/cap/younger.yaml
index 8efc3ac2573..9143c008b75 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/subtractions/pension/cap/younger.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/subtractions/pension/cap/younger.yaml
@@ -13,5 +13,7 @@ metadata:
       href: https://tax.colorado.gov/sites/tax/files/documents/DR_104_Book_2021.pdf#page=11
     - title: 2023 Colorado Individual Tax Filing Guide 104 Book - Subtractions Line 4
       href: https://tax.colorado.gov/sites/tax/files/documents/Book0104_2023.pdf#page=12
+    - title: 2024 Colorado Individual Tax Filing Guide 104 Book - Subtractions Line 4
+      href: https://tax.colorado.gov/sites/tax/files/documents/DR0104_book_2024.pdf#page=18
     - title: C.R.S. 39-22-104(4)(g)(III)(A)
       href: https://law.justia.com/codes/colorado/2022/title-39/article-22/part-1/section-39-22-104/
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/subtractions/pension/social_security_subtraction_available.yaml b/policyengine_us/parameters/gov/states/co/tax/income/subtractions/pension/social_security_subtraction_available.yaml
index aeb3b4bf8f7..e673f430516 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/subtractions/pension/social_security_subtraction_available.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/subtractions/pension/social_security_subtraction_available.yaml
@@ -11,3 +11,5 @@ metadata:
       href: https://law.justia.com/codes/colorado/2022/title-39/article-22/part-1/section-39-22-104/
     - title: C.R.S. 39-22-104(4)(f)(II)
       href: https://law.justia.com/codes/colorado/2021/title-39/article-22/part-1/section-39-22-104/
+    - title: 2024 Colorado Individual Tax Filing Guide 104 Book - Subtractions Line 3
+      href: https://tax.colorado.gov/sites/tax/files/documents/DR0104_book_2024.pdf#page=18
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/subtractions/subtractions.yaml b/policyengine_us/parameters/gov/states/co/tax/income/subtractions/subtractions.yaml
index 2dbe2a26edc..6d6f6fab9f5 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/subtractions/subtractions.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/subtractions/subtractions.yaml
@@ -52,3 +52,5 @@ metadata:
       href: https://advance.lexis.com/documentpage/?pdmfid=1000516&crid=20b2023b-0bab-47de-9fb8-549524cac008&action=pawlinkdoc&pdcomponentid=&pddocfullpath=%2fshared%2fdocument%2fstatutes-legislation%2furn%3acontentItem%3a683G-JJ73-CGX8-04HR-00008-00&pdtocnodeidentifier=ABPAACAACAABAACAAF&config=014FJAAyNGJkY2Y4Zi1mNjgyLTRkN2YtYmE4OS03NTYzNzYzOTg0OGEKAFBvZENhdGFsb2d592qv2Kywlf8caKqYROP5&ecomp=k2vckkk&prid=49fe2864-b8f7-4db8-8819-3b6d1cabfe53
     - title: 2023 Colorado Individual Tax Filing Guide 104 Book 
       href: https://tax.colorado.gov/sites/tax/files/documents/Book0104_2023.pdf#page=14
+    - title: 2024 Colorado Individual Tax Filing Guide 104 Book
+      href: https://tax.colorado.gov/sites/tax/files/documents/DR0104_book_2024.pdf#page=18