diff --git a/app/models/participant_profile/ecf.rb b/app/models/participant_profile/ecf.rb
index 84a0706707..10a09af71d 100644
--- a/app/models/participant_profile/ecf.rb
+++ b/app/models/participant_profile/ecf.rb
@@ -70,11 +70,39 @@ def self.eligible_to_change_cohort_and_continue_training(in_cohort_start_year:,
     query
   end
 
+  def self.archivable(for_cohort_start_year:, restrict_to_participant_ids: [])
+    latest_cohort = Cohort.order(start_year: :desc).first
+    return none unless for_cohort_start_year <= latest_cohort.start_year - Cohort::OPEN_COHORTS_COUNT
+
+    unbillable_states = %i[ineligible voided submitted].freeze
+
+    # Find all participants that have no FIP induction records (as finding those with only FIP is more complicated).
+    not_fip_induction_records = InductionRecord.left_joins(:induction_programme).where.not(induction_programme: { training_programme: :full_induction_programme })
+    not_fip_induction_records = not_fip_induction_records.where(participant_profile_id: restrict_to_participant_ids) if restrict_to_participant_ids.any?
+
+    query = left_joins(:participant_declarations, schedule: :cohort)
+      # Exclude participants that have any induction records that are not FIP.
+      .where.not(id: not_fip_induction_records.select(:participant_profile_id))
+      .where(cohorts: { start_year: for_cohort_start_year })
+      # Exclude participants that have any billable/submitted declarations, but
+      # retain participants that have no declarations at all.
+      .where.not("participant_declarations.id IS NOT NULL AND participant_declarations.state NOT IN (?)", unbillable_states)
+      .distinct
+
+    query = query.where(id: restrict_to_participant_ids) if restrict_to_participant_ids.any?
+
+    query
+  end
+
   # Instance Methods
   def eligible_to_change_cohort_and_continue_training?(in_cohort_start_year:)
     self.class.eligible_to_change_cohort_and_continue_training(in_cohort_start_year:, restrict_to_participant_ids: [id]).exists?
   end
 
+  def archivable?(for_cohort_start_year:)
+    self.class.archivable(for_cohort_start_year:, restrict_to_participant_ids: [id]).exists?
+  end
+
   def completed_induction?
     induction_completion_date.present?
   end
diff --git a/app/models/participant_profile/ect.rb b/app/models/participant_profile/ect.rb
index 28c30174f7..ab1bab383f 100644
--- a/app/models/participant_profile/ect.rb
+++ b/app/models/participant_profile/ect.rb
@@ -10,6 +10,14 @@ class ParticipantProfile::ECT < ParticipantProfile::ECF
     where(induction_start_date: nil).joins(:ecf_participant_eligibility).merge(ECFParticipantEligibility.waiting_for_induction)
   }
 
+  def self.archivable(for_cohort_start_year:, restrict_to_participant_ids: [])
+    latest_induction_start_date = Date.new(for_cohort_start_year, 9, 1)
+
+    super(for_cohort_start_year:, restrict_to_participant_ids:)
+      .where(induction_completion_date: nil)
+      .where("induction_start_date IS NULL OR induction_start_date < ?", latest_induction_start_date)
+  end
+
   def ect?
     true
   end
diff --git a/app/models/participant_profile/mentor.rb b/app/models/participant_profile/mentor.rb
index f8ca1a3a58..70c323d71f 100644
--- a/app/models/participant_profile/mentor.rb
+++ b/app/models/participant_profile/mentor.rb
@@ -21,6 +21,12 @@ class ParticipantProfile::Mentor < ParticipantProfile::ECF
     started_not_completed: "started_not_completed",
   }
 
+  def self.archivable(for_cohort_start_year:, restrict_to_participant_ids: [])
+    super(for_cohort_start_year:, restrict_to_participant_ids:)
+      .where(mentor_completion_date: nil)
+      .where.not(id: InductionRecord.where.not(mentor_profile_id: nil).select(:mentor_profile_id).distinct)
+  end
+
   def complete_training!(completion_date:, completion_reason:)
     self.mentor_completion_date = completion_date
     self.mentor_completion_reason = completion_reason
diff --git a/spec/factories/services/mentors/create.rb b/spec/factories/services/mentors/create.rb
index c9491f859e..4a1a6b0395 100644
--- a/spec/factories/services/mentors/create.rb
+++ b/spec/factories/services/mentors/create.rb
@@ -6,10 +6,11 @@
       lead_provider { create(:cpd_lead_provider, :with_lead_provider).lead_provider }
       uplifts { [] }
       trn { user.teacher_profile&.trn || sprintf("%07i", Random.random_number(9_999_999)) }
+      cohort { Cohort.current || create(:cohort, :current) }
     end
 
     user            { create(:user) }
-    school_cohort   { create(:school_cohort, :fip, :with_induction_programme, *uplifts, lead_provider:) }
+    school_cohort   { create(:school_cohort, :fip, :with_induction_programme, *uplifts, lead_provider:, cohort:) }
     full_name       { user.full_name }
     email           { user.email }
 
diff --git a/spec/models/participant_profile/ect_spec.rb b/spec/models/participant_profile/ect_spec.rb
index 781852a2a9..da29a98f0e 100644
--- a/spec/models/participant_profile/ect_spec.rb
+++ b/spec/models/participant_profile/ect_spec.rb
@@ -47,4 +47,27 @@
   end
 
   include_context "can change cohort and continue training", :ect, :mentor, :induction_completion_date
+
+  include_context "can archive participant profile", :mentor, :induction_completion_date do
+    def create_declaration(attrs = {})
+      create(:ect_participant_declaration, attrs)
+    end
+
+    def create_profile(attrs = {})
+      create(:ect_participant_profile, attrs)
+    end
+
+    describe ".archivable" do
+      subject { described_class.archivable(for_cohort_start_year:) }
+
+      it "does not include participants where the induction_start_date is 1/9/<for_cohort_start_year> or later" do
+        build_profile(cohort: eligible_cohort, induction_start_date: Date.new(for_cohort_start_year, 9, 1))
+        build_profile(cohort: eligible_cohort, induction_start_date: Date.new(for_cohort_start_year + 1, 3, 1))
+
+        eligible_participant = build_profile(cohort: eligible_cohort)
+
+        is_expected.to contain_exactly(eligible_participant)
+      end
+    end
+  end
 end
diff --git a/spec/models/participant_profile/mentor_spec.rb b/spec/models/participant_profile/mentor_spec.rb
index a32eeb79d4..cf80ad2284 100644
--- a/spec/models/participant_profile/mentor_spec.rb
+++ b/spec/models/participant_profile/mentor_spec.rb
@@ -61,4 +61,28 @@
   end
 
   include_context "can change cohort and continue training", :mentor, :ect, :mentor_completion_date
+
+  include_context "can archive participant profile", :ect, :mentor_completion_date do
+    def create_declaration(attrs = {})
+      create(:mentor_participant_declaration, attrs)
+    end
+
+    def create_profile(attrs = {})
+      create(:mentor_participant_profile, attrs)
+    end
+
+    describe ".archivable" do
+      subject { described_class.archivable(for_cohort_start_year:) }
+
+      it "does not include participants that have mentees" do
+        build_profile(cohort: eligible_cohort).tap do |mentor_profile|
+          create(:induction_record, :ect, mentor_profile:)
+        end
+
+        eligible_participant = build_profile(cohort: eligible_cohort)
+
+        is_expected.to contain_exactly(eligible_participant)
+      end
+    end
+  end
 end
diff --git a/spec/support/shared_examples/archivable_support.rb b/spec/support/shared_examples/archivable_support.rb
new file mode 100644
index 0000000000..cc18d1ed4d
--- /dev/null
+++ b/spec/support/shared_examples/archivable_support.rb
@@ -0,0 +1,85 @@
+# frozen_string_literal: true
+
+RSpec.shared_examples "can archive participant profile" do |other_participant_type, completed_training_at_attribute|
+  let(:for_cohort_start_year) { latest_cohort.start_year - Cohort::OPEN_COHORTS_COUNT }
+  let(:eligible_cohort) { create(:cohort, start_year: for_cohort_start_year) }
+  let(:latest_cohort) { create(:cohort, :current) }
+
+  def build_profile(attrs = {})
+    create_profile(attrs).tap do |participant_profile|
+      create(:induction_record, participant_profile:, induction_programme: create(:induction_programme, :fip))
+    end
+  end
+
+  def build_declaration(attrs = {})
+    create_declaration(attrs) do |declaration|
+      participant_profile = declaration.participant_profile
+      create(:induction_record, participant_profile:, induction_programme: create(:induction_programme, :fip))
+    end
+  end
+
+  describe ".archivable" do
+    let(:restrict_to_participant_ids) { [] }
+    let(:eligible_no_declarations) { build_profile(cohort: eligible_cohort) }
+    let(:eligible_only_unbillable_declarations) { build_declaration(state: :voided, cohort: eligible_cohort).participant_profile }
+
+    before do
+      # Participant not in an eligible cohort.
+      build_profile(cohort: latest_cohort)
+
+      # Participant with billable declarations.
+      build_declaration(state: :paid, cohort: eligible_cohort)
+
+      # Other participant type.
+      create("#{other_participant_type}_participant_profile", cohort: eligible_cohort)
+
+      # Ineligible due to having the completed_training_at_attribute populated.
+      build_declaration(state: :ineligible, cohort: eligible_cohort).participant_profile.update!("#{completed_training_at_attribute}": 1.month.ago)
+
+      # Participant with CIP induction record.
+      build_profile(cohort: eligible_cohort).tap do |participant_profile|
+        create(:induction_record, participant_profile:, induction_programme: create(:induction_programme, :cip))
+      end
+    end
+
+    subject { described_class.archivable(for_cohort_start_year:, restrict_to_participant_ids:) }
+
+    it { is_expected.to contain_exactly(eligible_no_declarations, eligible_only_unbillable_declarations) }
+
+    context "when restricted to a set of participant IDs" do
+      let(:restrict_to_participant_ids) { [eligible_no_declarations.id] }
+
+      it { is_expected.to contain_exactly(eligible_no_declarations) }
+    end
+  end
+
+  describe "archivable?" do
+    it "returns true if the participant is in an eligible cohort and has no declarations" do
+      participant_profile = build_profile(cohort: eligible_cohort)
+      expect(participant_profile).to be_archivable(for_cohort_start_year:)
+    end
+
+    %i[ineligible voided submitted].each do |unbillable_state|
+      it "returns true if the participant is in an eligible cohort and the participant has only #{unbillable_state} declarations" do
+        participant_profile = build_declaration(state: unbillable_state, cohort: eligible_cohort).participant_profile
+        expect(participant_profile).to be_archivable(for_cohort_start_year:)
+      end
+    end
+
+    it "returns false if the participant is not in an eligible cohort" do
+      participant_profile = build_profile(cohort: latest_cohort)
+      expect(participant_profile).not_to be_archivable(for_cohort_start_year:)
+    end
+
+    it "returns false if the participant has billable declarations" do
+      participant_profile = build_declaration(state: :paid, cohort: eligible_cohort).participant_profile
+      expect(participant_profile).not_to be_archivable(for_cohort_start_year:)
+    end
+
+    it "returns false if the participant has a CIP induction record" do
+      participant_profile = build_profile(cohort: latest_cohort)
+      create(:induction_record, participant_profile:, induction_programme: create(:induction_programme, :cip))
+      expect(participant_profile).not_to be_archivable(for_cohort_start_year:)
+    end
+  end
+end