diff --git a/changelog_entry.yaml b/changelog_entry.yaml
index e69de29bb2d..6297ce90508 100644
--- a/changelog_entry.yaml
+++ b/changelog_entry.yaml
@@ -0,0 +1,4 @@
+- bump: minor
+  changes:
+    added:
+    - Backdating Maine TANF parameters.
diff --git a/policyengine_us/parameters/gov/states/me/dhhs/tanf/child_care/amount.yaml b/policyengine_us/parameters/gov/states/me/dhhs/tanf/child_care/amount.yaml
index e3c3017d93a..8015ca012d8 100644
--- a/policyengine_us/parameters/gov/states/me/dhhs/tanf/child_care/amount.yaml
+++ b/policyengine_us/parameters/gov/states/me/dhhs/tanf/child_care/amount.yaml
@@ -15,10 +15,10 @@ metadata:
 # - Age 2+: $175/month
 brackets:
   - threshold:
-      2023-10-01: 0
+      2013-11-01: 0
     amount:
-      2023-10-01: 200
+      2013-11-01: 200
   - threshold:
-      2023-10-01: 2
+      2013-11-01: 2
     amount:
-      2023-10-01: 175
+      2013-11-01: 175
diff --git a/policyengine_us/parameters/gov/states/me/dhhs/tanf/child_support_deduction.yaml b/policyengine_us/parameters/gov/states/me/dhhs/tanf/child_support_deduction.yaml
index 208cafb9113..8bd6fb76c80 100644
--- a/policyengine_us/parameters/gov/states/me/dhhs/tanf/child_support_deduction.yaml
+++ b/policyengine_us/parameters/gov/states/me/dhhs/tanf/child_support_deduction.yaml
@@ -1,7 +1,7 @@
 description: Maine excludes up to this amount of child support received from countable income under the Temporary Assistance for Needy Families program.
 
 values:
-  2023-10-01: 50
+  2013-11-01: 50
 
 metadata:
   unit: currency-USD
diff --git a/policyengine_us/parameters/gov/states/me/dhhs/tanf/earned_income/flat_deduction.yaml b/policyengine_us/parameters/gov/states/me/dhhs/tanf/earned_income/flat_deduction.yaml
index e3f8041cf50..9917dbf76a8 100644
--- a/policyengine_us/parameters/gov/states/me/dhhs/tanf/earned_income/flat_deduction.yaml
+++ b/policyengine_us/parameters/gov/states/me/dhhs/tanf/earned_income/flat_deduction.yaml
@@ -1,7 +1,7 @@
 description: Maine deducts this flat amount from gross earned income under the Temporary Assistance for Needy Families program.
 
 values:
-  2023-10-01: 108
+  2013-11-01: 108
 
 metadata:
   unit: currency-USD
diff --git a/policyengine_us/parameters/gov/states/me/dhhs/tanf/earned_income/percentage_disregard.yaml b/policyengine_us/parameters/gov/states/me/dhhs/tanf/earned_income/percentage_disregard.yaml
index c6e0c0f06cb..5630ef051b4 100644
--- a/policyengine_us/parameters/gov/states/me/dhhs/tanf/earned_income/percentage_disregard.yaml
+++ b/policyengine_us/parameters/gov/states/me/dhhs/tanf/earned_income/percentage_disregard.yaml
@@ -1,7 +1,7 @@
 description: Maine excludes this share of remaining earned income after the flat deduction under the Temporary Assistance for Needy Families program.
 
 values:
-  2023-10-01: 0.5
+  2013-11-01: 0.5
 
 metadata:
   unit: /1
diff --git a/policyengine_us/parameters/gov/states/me/dhhs/tanf/max_unit_size.yaml b/policyengine_us/parameters/gov/states/me/dhhs/tanf/max_unit_size.yaml
index 7d5334dbcd7..54207383ad6 100644
--- a/policyengine_us/parameters/gov/states/me/dhhs/tanf/max_unit_size.yaml
+++ b/policyengine_us/parameters/gov/states/me/dhhs/tanf/max_unit_size.yaml
@@ -1,7 +1,7 @@
 description: Maine uses this amount as the maximum unit size for payment schedule lookups under the Temporary Assistance for Needy Families program.
 
 values:
-  2023-10-01: 8
+  2013-10-01: 8
 
 metadata:
   unit: person
diff --git a/policyengine_us/parameters/gov/states/me/dhhs/tanf/maximum_benefit/each_additional.yaml b/policyengine_us/parameters/gov/states/me/dhhs/tanf/maximum_benefit/additional_person.yaml
similarity index 77%
rename from policyengine_us/parameters/gov/states/me/dhhs/tanf/maximum_benefit/each_additional.yaml
rename to policyengine_us/parameters/gov/states/me/dhhs/tanf/maximum_benefit/additional_person.yaml
index 814cab64b25..6be1c067dde 100644
--- a/policyengine_us/parameters/gov/states/me/dhhs/tanf/maximum_benefit/each_additional.yaml
+++ b/policyengine_us/parameters/gov/states/me/dhhs/tanf/maximum_benefit/additional_person.yaml
@@ -1,6 +1,10 @@
 description: Maine provides up to this additional maximum benefit amount for each household member beyond eight under the Temporary Assistance for Needy Families program.
 
 values:
+  2013-11-01: 124
+  2017-10-01: 149
+  2018-10-01: 152
+  2019-10-01: 156
   2020-10-01: 157
   2021-10-01: 160
   2022-10-01: 169
@@ -16,3 +20,5 @@ metadata:
       href: https://www.law.cornell.edu/regulations/maine/10-144-C-M-R-ch-331-app-Charts
     - title: 10-144 C.M.R. Chapter 331, TANF 121A Rule Pages
       href: https://www.maine.gov/dhhs/sites/maine.gov.dhhs/files/rule-2024-09/TANF%20121A%20Rule%20Pages%20%28Clean%29.pdf#page=2
+    - title: SSA POMS SI BOS00830.404 - Maine TANF (Effective 11/2013)
+      href: https://secure.ssa.gov/apps10/poms.nsf/lnx/0500830404BOS
diff --git a/policyengine_us/parameters/gov/states/me/dhhs/tanf/maximum_benefit/amount.yaml b/policyengine_us/parameters/gov/states/me/dhhs/tanf/maximum_benefit/amount.yaml
index d99166c8f08..a02a87e13a4 100644
--- a/policyengine_us/parameters/gov/states/me/dhhs/tanf/maximum_benefit/amount.yaml
+++ b/policyengine_us/parameters/gov/states/me/dhhs/tanf/maximum_benefit/amount.yaml
@@ -5,58 +5,92 @@ metadata:
   period: month
   breakdown:
     - range(1, 9)
-  breakdown_labels:
-    - Household size
+  breakdown_label:
+    - Assistance unit size
   label: Maine TANF maximum benefit amount
   reference:
     - title: 10-144 C.M.R. Chapter 331, Appendix Charts (Table 2)
       href: https://www.law.cornell.edu/regulations/maine/10-144-C-M-R-ch-331-app-Charts
     - title: 10-144 C.M.R. Chapter 331, TANF 121A Rule Pages
       href: https://www.maine.gov/dhhs/sites/maine.gov.dhhs/files/rule-2024-09/TANF%20121A%20Rule%20Pages%20%28Clean%29.pdf#page=2
+    - title: SSA POMS SI BOS00830.404 - Maine TANF (Effective 11/2013)
+      href: https://secure.ssa.gov/apps10/poms.nsf/lnx/0500830404BOS
 
 1:
+  2013-11-01: 230
+  2017-10-01: 276
+  2018-10-01: 282
+  2019-10-01: 290
   2020-10-01: 294
   2021-10-01: 298
   2022-10-01: 315
   2023-10-01: 343
   2024-10-01: 425
 2:
+  2013-11-01: 363
+  2017-10-01: 435
+  2018-10-01: 444
+  2019-10-01: 457
   2020-10-01: 463
   2021-10-01: 469
   2022-10-01: 497
   2023-10-01: 540
   2024-10-01: 669
 3:
+  2013-11-01: 485
+  2017-10-01: 582
+  2018-10-01: 594
+  2019-10-01: 611
   2020-10-01: 620
   2021-10-01: 628
   2022-10-01: 665
   2023-10-01: 723
   2024-10-01: 895
 4:
+  2013-11-01: 611
+  2017-10-01: 733
+  2018-10-01: 748
+  2019-10-01: 769
   2020-10-01: 781
   2021-10-01: 791
   2022-10-01: 837
   2023-10-01: 910
   2024-10-01: 1_127
 5:
+  2013-11-01: 733
+  2017-10-01: 879
+  2018-10-01: 897
+  2019-10-01: 922
   2020-10-01: 936
   2021-10-01: 948
   2022-10-01: 1_004
   2023-10-01: 1_092
   2024-10-01: 1_352
 6:
+  2013-11-01: 856
+  2017-10-01: 1_027
+  2018-10-01: 1_048
+  2019-10-01: 1_077
   2020-10-01: 1_094
   2021-10-01: 1_108
   2022-10-01: 1_174
   2023-10-01: 1_276
   2024-10-01: 1_580
 7:
+  2013-11-01: 981
+  2017-10-01: 1_177
+  2018-10-01: 1_201
+  2019-10-01: 1_235
   2020-10-01: 1_254
   2021-10-01: 1_270
   2022-10-01: 1_345
   2023-10-01: 1_462
   2024-10-01: 1_811
 8:
+  2013-11-01: 1_105
+  2017-10-01: 1_326
+  2018-10-01: 1_353
+  2019-10-01: 1_391
   2020-10-01: 1_413
   2021-10-01: 1_431
   2022-10-01: 1_515
diff --git a/policyengine_us/parameters/gov/states/me/dhhs/tanf/resource_limit.yaml b/policyengine_us/parameters/gov/states/me/dhhs/tanf/resource_limit.yaml
index a7c815f4d55..72396b34119 100644
--- a/policyengine_us/parameters/gov/states/me/dhhs/tanf/resource_limit.yaml
+++ b/policyengine_us/parameters/gov/states/me/dhhs/tanf/resource_limit.yaml
@@ -1,6 +1,7 @@
 description: Maine limits countable resources to this amount under the Temporary Assistance for Needy Families program.
 
 values:
+  1997-06-01: 2_000
   2023-10-25: 10_000
 
 metadata:
diff --git a/policyengine_us/parameters/gov/states/me/dhhs/tanf/standard_of_need/each_additional.yaml b/policyengine_us/parameters/gov/states/me/dhhs/tanf/standard_of_need/additional_person.yaml
similarity index 91%
rename from policyengine_us/parameters/gov/states/me/dhhs/tanf/standard_of_need/each_additional.yaml
rename to policyengine_us/parameters/gov/states/me/dhhs/tanf/standard_of_need/additional_person.yaml
index aee46c4e800..8cf0f3a1e51 100644
--- a/policyengine_us/parameters/gov/states/me/dhhs/tanf/standard_of_need/each_additional.yaml
+++ b/policyengine_us/parameters/gov/states/me/dhhs/tanf/standard_of_need/additional_person.yaml
@@ -1,6 +1,10 @@
 description: Maine provides this additional amount to the standard of need for each household member beyond eight under the Temporary Assistance for Needy Families program.
 
 values:
+  2013-11-01: 159
+  2017-10-01: 184
+  2018-10-01: 187
+  2019-10-01: 191
   2020-10-01: 192
   2021-10-01: 195
   2022-10-01: 204
diff --git a/policyengine_us/parameters/gov/states/me/dhhs/tanf/standard_of_need/amount.yaml b/policyengine_us/parameters/gov/states/me/dhhs/tanf/standard_of_need/amount.yaml
index 3b1cafe8169..1134e844383 100644
--- a/policyengine_us/parameters/gov/states/me/dhhs/tanf/standard_of_need/amount.yaml
+++ b/policyengine_us/parameters/gov/states/me/dhhs/tanf/standard_of_need/amount.yaml
@@ -5,8 +5,8 @@ metadata:
   period: month
   breakdown:
     - range(1, 9)
-  breakdown_labels:
-    - Household size
+  breakdown_label:
+    - Assistance unit size
   label: Maine TANF standard of need amount
   reference:
     - title: 10-144 C.M.R. Chapter 331, Appendix Charts (Table 2)
@@ -15,48 +15,80 @@ metadata:
       href: https://www.maine.gov/dhhs/sites/maine.gov.dhhs/files/rule-2024-09/TANF%20121A%20Rule%20Pages%20%28Clean%29.pdf#page=2
 
 1:
+  2013-11-01: 294
+  2017-10-01: 340
+  2018-10-01: 346
+  2019-10-01: 354
   2020-10-01: 358
   2021-10-01: 362
   2022-10-01: 379
   2023-10-01: 407
   2024-10-01: 489
 2:
+  2013-11-01: 463
+  2017-10-01: 535
+  2018-10-01: 544
+  2019-10-01: 557
   2020-10-01: 563
   2021-10-01: 569
   2022-10-01: 597
   2023-10-01: 640
   2024-10-01: 769
 3:
+  2013-11-01: 620
+  2017-10-01: 717
+  2018-10-01: 729
+  2019-10-01: 746
   2020-10-01: 755
   2021-10-01: 763
   2022-10-01: 800
   2023-10-01: 858
   2024-10-01: 1_030
 4:
+  2013-11-01: 780
+  2017-10-01: 902
+  2018-10-01: 917
+  2019-10-01: 938
   2020-10-01: 950
   2021-10-01: 960
   2022-10-01: 1_006
   2023-10-01: 1_079
   2024-10-01: 1_296
 5:
+  2013-11-01: 938
+  2017-10-01: 1_084
+  2018-10-01: 1_102
+  2019-10-01: 1_127
   2020-10-01: 1_141
   2021-10-01: 1_153
   2022-10-01: 1_209
   2023-10-01: 1_297
   2024-10-01: 1_557
 6:
+  2013-11-01: 1_096
+  2017-10-01: 1_267
+  2018-10-01: 1_288
+  2019-10-01: 1_317
   2020-10-01: 1_334
   2021-10-01: 1_348
   2022-10-01: 1_414
   2023-10-01: 1_516
   2024-10-01: 1_820
 7:
+  2013-11-01: 1_255
+  2017-10-01: 1_451
+  2018-10-01: 1_475
+  2019-10-01: 1_509
   2020-10-01: 1_528
   2021-10-01: 1_544
   2022-10-01: 1_619
   2023-10-01: 1_736
   2024-10-01: 2_085
 8:
+  2013-11-01: 1_414
+  2017-10-01: 1_635
+  2018-10-01: 1_662
+  2019-10-01: 1_700
   2020-10-01: 1_722
   2021-10-01: 1_740
   2022-10-01: 1_824
diff --git a/policyengine_us/tests/policy/baseline/gov/states/me/dhhs/tanf/me_tanf_maximum_benefit.yaml b/policyengine_us/tests/policy/baseline/gov/states/me/dhhs/tanf/me_tanf_maximum_benefit.yaml
index 65a3ad0515f..04e0361b06d 100644
--- a/policyengine_us/tests/policy/baseline/gov/states/me/dhhs/tanf/me_tanf_maximum_benefit.yaml
+++ b/policyengine_us/tests/policy/baseline/gov/states/me/dhhs/tanf/me_tanf_maximum_benefit.yaml
@@ -47,3 +47,12 @@
   output:
     # Non-Maine state returns 0
     me_tanf_maximum_benefit: 0
+
+- name: Case 6, household size 3 in 2018.
+  period: 2018-01
+  input:
+    spm_unit_size: 3
+    state_code: ME
+  output:
+    # Max benefit for size 3 (2017-10-01 value) = $582
+    me_tanf_maximum_benefit: 582
diff --git a/policyengine_us/tests/policy/baseline/gov/states/me/dhhs/tanf/me_tanf_standard_of_need.yaml b/policyengine_us/tests/policy/baseline/gov/states/me/dhhs/tanf/me_tanf_standard_of_need.yaml
index 4a8b36e68ba..97e6b94aae5 100644
--- a/policyengine_us/tests/policy/baseline/gov/states/me/dhhs/tanf/me_tanf_standard_of_need.yaml
+++ b/policyengine_us/tests/policy/baseline/gov/states/me/dhhs/tanf/me_tanf_standard_of_need.yaml
@@ -101,3 +101,24 @@
   output:
     # Non-Maine state returns 0
     me_tanf_standard_of_need: 0
+
+- name: Case 6, household size 3 in 2018.
+  period: 2018-01
+  input:
+    people:
+      person1:
+        age: 30
+      person2:
+        age: 8
+      person3:
+        age: 5
+    spm_units:
+      spm_unit:
+        members: [person1, person2, person3]
+    households:
+      household:
+        members: [person1, person2, person3]
+        state_code: ME
+  output:
+    # SON for size 3 (2017-10-01 value) = $717
+    me_tanf_standard_of_need: 717
diff --git a/policyengine_us/variables/gov/states/me/dhhs/tanf/me_tanf_maximum_benefit.py b/policyengine_us/variables/gov/states/me/dhhs/tanf/me_tanf_maximum_benefit.py
index 56a4cbe6a5a..34d299e72b4 100644
--- a/policyengine_us/variables/gov/states/me/dhhs/tanf/me_tanf_maximum_benefit.py
+++ b/policyengine_us/variables/gov/states/me/dhhs/tanf/me_tanf_maximum_benefit.py
@@ -28,6 +28,6 @@ def formula(spm_unit, period, parameters):
         base_amount = p.maximum_benefit.amount[capped_size]
 
         # Add incremental amount for households larger than max size
-        incremental = additional_members * p.maximum_benefit.each_additional
+        incremental = additional_members * p.maximum_benefit.additional_person
 
         return base_amount + incremental
diff --git a/policyengine_us/variables/gov/states/me/dhhs/tanf/me_tanf_standard_of_need.py b/policyengine_us/variables/gov/states/me/dhhs/tanf/me_tanf_standard_of_need.py
index 12b65ac5be7..707ef7e64d1 100644
--- a/policyengine_us/variables/gov/states/me/dhhs/tanf/me_tanf_standard_of_need.py
+++ b/policyengine_us/variables/gov/states/me/dhhs/tanf/me_tanf_standard_of_need.py
@@ -28,6 +28,6 @@ def formula(spm_unit, period, parameters):
         base_amount = p.standard_of_need.amount[capped_size]
 
         # Add incremental amount for households larger than max size
-        incremental = additional_members * p.standard_of_need.each_additional
+        incremental = additional_members * p.standard_of_need.additional_person
 
         return base_amount + incremental