Presume a member 20+ years younger is the claimant's child when no roles are supplied

changelog.d/2039-unflagged-gap.changed.md

@@ -0,0 +1 @@
+- Without any parent flag, a member at least 20 years younger than the claimant is now presumed to be their child at any age (`presumed_child.minimum_age_gap_at_any_age`), so ages 50 and 25 entered without relationships are a single claimant and an adult child, not a couple. Members 16 to 19 years younger stay partners from age 20. The presumption only applies where `is_claimant_or_partner` is not supplied: a dataset that carries it (such as policyengine-uk-data's enhanced FRS, which has supplied the FRS roles since 1.58.0) is unaffected, while datasets without it are not.

policyengine_uk/parameters/household/demographic/benefit_unit/presumed_child/age_limit.yaml

@@ -1,4 +1,4 @@
-description: Age below which a benefit-unit member much younger than the claimant is presumed to be the claimant's child rather than their partner, when relationships are not supplied. The limit does not apply when the claimant is flagged as a parent and no member under it, at least the minimum age gap younger, explains the flag. This is a PolicyEngine modelling presumption, not a statutory rule.
+description: Age below which a benefit-unit member much younger than the claimant is presumed to be the claimant's child rather than their partner, when relationships are not supplied. The limit does not apply when the claimant is flagged as a parent and no member under it, at least the minimum age gap younger, explains the flag, nor to a member younger by at least the minimum age gap at any age. This is a PolicyEngine modelling presumption, not a statutory rule.
 values:
   0001-01-01: 20
 metadata:

policyengine_uk/parameters/household/demographic/benefit_unit/presumed_child/minimum_age_gap.yaml

@@ -1,4 +1,4 @@
-description: Minimum age gap below the claimant at which a younger member is presumed to be the claimant's child rather than their partner, when relationships are not supplied. It applies at any age when the claimant is flagged as a parent and no younger member under the presumed child age limit explains the flag, and otherwise only under that limit. This is a PolicyEngine modelling presumption, not a statutory rule.
+description: Minimum age gap below the claimant at which a younger member is presumed to be the claimant's child rather than their partner, when relationships are not supplied. It applies at any age when the claimant is flagged as a parent and no younger member under the presumed child age limit explains the flag, and otherwise only under that limit; a larger gap (the minimum age gap at any age) applies at any age. This is a PolicyEngine modelling presumption, not a statutory rule.
 values:
   0001-01-01: 16
 metadata:

policyengine_uk/parameters/household/demographic/benefit_unit/presumed_child/minimum_age_gap_at_any_age.yaml

@@ -0,0 +1,6 @@
+description: Minimum age gap below the claimant at which a younger member is presumed to be the claimant's child rather than their partner at any age, even when the claimant is not flagged as a parent, when relationships are not supplied. A member flagged as a parent can still be the partner. This is a PolicyEngine modelling presumption, not a statutory rule.
+values:
+  0001-01-01: 20
+metadata:
+  unit: year
+  label: presumed child minimum age gap at any age

policyengine_uk/tests/policy/baseline/finance/benefit/family/housing_benefit/applicable_income/housing_benefit_applicable_income_disregard.yaml

@@ -481,8 +481,10 @@
     people:
       claimant:
         age: 70
+        is_claimant_or_partner: true
       partner:
         age: 50
+        is_claimant_or_partner: true
         employment_income: 3_000
     benunits:
       benunit:

policyengine_uk/tests/policy/baseline/finance/benefit/family/housing_benefit/housing_benefit_pension_age_personal_allowance.yaml

@@ -214,10 +214,12 @@
         age: 80
         months_since_last_birthday: 4.1613
         is_male: true
+        is_claimant_or_partner: true
       younger:
         age: 60
         months_since_last_birthday: 9.1613
         is_male: false
+        is_claimant_or_partner: true
     benunits:
       benunit:
         members: [older, younger]
@@ -227,6 +229,7 @@
         housing_benefit_pension_age_regulations_apply: true
         benefits_premiums: 0
   output:
+    relation_type: COUPLE
     housing_benefit_attained_pension_age_before_cutoff: true
     housing_benefit_applicable_amount: 383.35 * 52  # para 1(2)(b), older attained 1 June 2011, younger attained 1 January 2033
 

policyengine_uk/tests/policy/baseline/finance/benefit/family/housing_benefit/housing_benefit_universal_credit_passport.yaml

@@ -249,9 +249,11 @@
         age: 70
         private_pension_income: 5_000
         housing_benefit_reported: 1
+        is_claimant_or_partner: true
       partner:
         age: 40
         employment_income: 2_000
+        is_claimant_or_partner: true
     benunits:
       benunit:
         members: [claimant, partner]
@@ -266,6 +268,7 @@
         rent: 5_720
         savings: 9_000
   output:
+    relation_type: COUPLE
     housing_benefit_pension_age_regulations_apply: false
     housing_benefit_on_passporting_benefit: true
     housing_benefit_applicable_income_disregard: 2_000

policyengine_uk/tests/policy/baseline/finance/benefit/family/housing_benefit/pension_age_premiums.yaml

@@ -289,9 +289,11 @@
       claimant:
         age: {2026: 50}
         is_disabled_for_benefits: {2026: true}
+        is_claimant_or_partner: true
       partner:
         age: {2026: 70}
         state_pension: {2026: 3_000}
+        is_claimant_or_partner: true
     benunits:
       benunit:
         members: [claimant, partner]
@@ -303,6 +305,7 @@
         rent: {2026: 6_240}
         council_tax: {2026: 2_000}
   output:
+    relation_type: COUPLE
     is_uc_entitled: true
     housing_benefit_pension_age_regulations_apply: false
     council_tax_reduction_pensioner: false

policyengine_uk/tests/policy/baseline/finance/benefit/family/tax_credits_working_hours.yaml

@@ -13,18 +13,21 @@
         is_parent: false
         is_disabled_for_benefits: false
         working_tax_credit_reported: 1
+        is_claimant_or_partner: true
       adult_1:
         age: 40
         hours_worked: 1040
         employment_income: 5000
         is_parent: false
         is_disabled_for_benefits: false
+        is_claimant_or_partner: true
     benunits:
       family:
         members:
         - adult_0
         - adult_1
   output:
+    relation_type: COUPLE
     working_tax_credit: 0
     is_WTC_eligible: false
 - name: A worker aged sixty qualifies on their own sixteen hours
@@ -39,18 +42,21 @@
         is_parent: false
         is_disabled_for_benefits: false
         working_tax_credit_reported: 1
+        is_claimant_or_partner: true
       adult_1:
         age: 40
         hours_worked: 0
         employment_income: 0
         is_parent: false
         is_disabled_for_benefits: false
+        is_claimant_or_partner: true
     benunits:
       family:
         members:
         - adult_0
         - adult_1
   output:
+    relation_type: COUPLE
     is_WTC_eligible: true
     working_tax_credit: 4935
 - name: A thirty hour worker cannot borrow a partners age twenty five

policyengine_uk/tests/policy/baseline/finance/benefit/family/universal_credit/income/income_floor/uc_MIF_applies.yaml

@@ -240,10 +240,13 @@
       older:
         age: 70
         self_employment_income: 3_000
+        is_claimant_or_partner: true
       younger:
         age: 40
         self_employment_income: 3_000
+        is_claimant_or_partner: true
   output:
+    relation_type: COUPLE
     uc_mif_applies: [false, true]
 
 - name: A partner who cannot be a joint claimant is not a claimant

policyengine_uk/tests/policy/baseline/finance/benefit/family/universal_credit/income/income_floor/uc_mif_earned_income.yaml

@@ -531,15 +531,18 @@
         age: 70
         employment_income: 6_000
         would_claim_marriage_allowance: false
+        is_claimant_or_partner: true
       self_employed:
         age: 40
         self_employment_income: 3_600
         would_claim_marriage_allowance: false
+        is_claimant_or_partner: true
     households:
       household:
         members: [older, self_employed]
         region: NORTH_EAST
   output:
+    relation_type: COUPLE
     uc_mif_applies: [false, true]
     uc_minimum_income_floor: [0, 20_386.03]
     # 20,386.03 - 6,000.

policyengine_uk/tests/policy/baseline/finance/benefit/family/universal_credit/income/uc_earnings_deductions.yaml

@@ -105,9 +105,11 @@
       pensioner:
         age: 70
         state_pension: 16_000
+        is_claimant_or_partner: true
       partner:
         age: 45
         employment_income: 13_000
+        is_claimant_or_partner: true
     benunits:
       benunit:
         members: [pensioner, partner]
@@ -117,6 +119,7 @@
         tenure_type: RENT_FROM_COUNCIL
         rent: 20_000
   output:
+    relation_type: COUPLE
     # Pensioner: (16,000 - 12,570) x 20% = 686, on State Pension.
     # Partner: (13,000 - 12,570) x 20% = 86 and (13,000 - 12,569.96) x 8%
     # = 34.40. Both are above the personal allowance, so there is no
@@ -304,16 +307,19 @@
         employment_income: 20_000
         married_couples_allowance: 11_000
         would_claim_marriage_allowance: false
+        is_claimant_or_partner: true
       partner:
         age: 45
         would_claim_marriage_allowance: false
+        is_claimant_or_partner: true
     benunits:
       benunit:
         members: [older, partner]
     households:
       household:
         members: [older, partner]
   output:
+    relation_type: COUPLE
     # Married couple's allowance reduction: 10% x 11,000 = 1,100.
     capped_mcad: [1_100, 0]
     # (20,000 - 12,570) x 20% = 1,486, less 1,100.
@@ -331,16 +337,19 @@
         private_pension_income: 5_000
         married_couples_allowance: 11_000
         would_claim_marriage_allowance: false
+        is_claimant_or_partner: true
       partner:
         age: 45
         would_claim_marriage_allowance: false
+        is_claimant_or_partner: true
     benunits:
       benunit:
         members: [older, partner]
     households:
       household:
         members: [older, partner]
   output:
+    relation_type: COUPLE
     # 1,486 on earnings + 5,000 x 20% on the pension - 1,100.
     income_tax: [1_386, 0]
     # The reduction still comes off the earnings slice: 1,486 - 1,100.
@@ -359,16 +368,19 @@
         unused_pension_annual_allowance: 0
         married_couples_allowance: 11_000
         would_claim_marriage_allowance: false
+        is_claimant_or_partner: true
       partner:
         age: 45
         would_claim_marriage_allowance: false
+        is_claimant_or_partner: true
     benunits:
       benunit:
         members: [older, partner]
     households:
       household:
         members: [older, partner]
   output:
+    relation_type: COUPLE
     # Contributions of 65,000 exceed the 60,000 annual allowance by 5,000,
     # charged at the basic rate: 1,000.
     personal_pension_contributions_tax: [1_000, 0]

policyengine_uk/tests/policy/baseline/finance/benefit/family/universal_credit/work_related_requirements/uc_work_related_group_apart_from_earnings.yaml

@@ -133,9 +133,12 @@
     people:
       older:
         age: 70
+        is_claimant_or_partner: true
       younger:
         age: 40
+        is_claimant_or_partner: true
   output:
+    relation_type: COUPLE
     uc_work_related_group_apart_from_earnings: [NO_REQUIREMENTS, ALL_REQUIREMENTS]
 
 # Reg. 89(1)(a) reads "the qualifying age for state pension credit": State
@@ -163,10 +166,13 @@
         age: 64
         months_since_last_birthday: 6
         gender: MALE
+        is_claimant_or_partner: true
       younger:
         age: 40
         gender: FEMALE
+        is_claimant_or_partner: true
   output:
+    relation_type: COUPLE
     has_attained_state_pension_credit_qualifying_age: [true, false]
     is_SP_age: [false, false]
     uc_work_related_group_apart_from_earnings: [NO_REQUIREMENTS, ALL_REQUIREMENTS]
@@ -181,10 +187,13 @@
         age: 63
         months_since_last_birthday: 4
         gender: MALE
+        is_claimant_or_partner: true
       younger:
         age: 40
         gender: FEMALE
+        is_claimant_or_partner: true
   output:
+    relation_type: COUPLE
     has_attained_state_pension_credit_qualifying_age: [false, false]
     is_SP_age: [false, false]
     uc_work_related_group_apart_from_earnings: [ALL_REQUIREMENTS, ALL_REQUIREMENTS]
@@ -197,10 +206,13 @@
         age: 64
         months_since_last_birthday: 4
         gender: MALE
+        is_claimant_or_partner: true
       younger:
         age: 41
         gender: FEMALE
+        is_claimant_or_partner: true
   output:
+    relation_type: COUPLE
     has_attained_state_pension_credit_qualifying_age: [true, false]
     is_SP_age: [false, false]
     uc_work_related_group_apart_from_earnings: [NO_REQUIREMENTS, ALL_REQUIREMENTS]
@@ -215,10 +227,13 @@
         age: 64
         months_since_last_birthday: 6
         gender: FEMALE
+        is_claimant_or_partner: true
       younger:
         age: 40
         gender: MALE
+        is_claimant_or_partner: true
   output:
+    relation_type: COUPLE
     has_attained_state_pension_credit_qualifying_age: [true, false]
     is_SP_age: [true, false]
     uc_work_related_group_apart_from_earnings: [NO_REQUIREMENTS, ALL_REQUIREMENTS]
@@ -234,10 +249,13 @@
         age: 64
         months_since_last_birthday: 10
         gender: MALE
+        is_claimant_or_partner: true
       younger:
         age: 40
         gender: FEMALE
+        is_claimant_or_partner: true
   output:
+    relation_type: COUPLE
     has_attained_state_pension_credit_qualifying_age: [false, false]
     is_SP_age: [false, false]
     uc_work_related_group_apart_from_earnings: [ALL_REQUIREMENTS, ALL_REQUIREMENTS]
@@ -253,10 +271,13 @@
         months_since_last_birthday: 6
         gender: MALE
         self_employment_income: 5_000
+        is_claimant_or_partner: true
       younger:
         age: 40
         gender: FEMALE
+        is_claimant_or_partner: true
   output:
+    relation_type: COUPLE
     uc_is_in_gainful_self_employment: [true, false]
     uc_work_related_group_apart_from_earnings: [NO_REQUIREMENTS, ALL_REQUIREMENTS]
     uc_mif_applies: [false, false]

policyengine_uk/tests/policy/baseline/gov/dfe/targeted_childcare_entitlement/targeted_childcare_entitlement_guarantee_credit.yaml

@@ -245,9 +245,11 @@
     people:
       person1:
         age: 70
+        is_claimant_or_partner: true
         state_pension_reported: 10_000
       person2:
         age: 40
+        is_claimant_or_partner: true
       person3:
         age: 2
     benunits:
@@ -401,9 +403,11 @@
     people:
       person1:
         age: 80
+        is_claimant_or_partner: true
         state_pension_reported: 10_000
       person2:
         age: 40
+        is_claimant_or_partner: true
       person3:
         age: 2
     benunits: