diff --git a/app/models/budget.rb b/app/models/budget.rb
new file mode 100644
index 000000000..d19b38959
--- /dev/null
+++ b/app/models/budget.rb
@@ -0,0 +1,24 @@
+class Budget < ActiveRecord::Base
+
+  def on_hold?
+    phase == "on_hold"
+  end
+
+  def accepting?
+    phase == "accepting"
+  end
+
+  def selecting?
+    phase == "selecting"
+  end
+
+  def balloting?
+    phase == "balloting"
+  end
+
+  def finished?
+    phase == "finished"
+  end
+
+end
+
diff --git a/app/models/budget/ballot.rb b/app/models/budget/ballot.rb
new file mode 100644
index 000000000..2cc9da8a7
--- /dev/null
+++ b/app/models/budget/ballot.rb
@@ -0,0 +1,10 @@
+class Budget
+  class Ballot < ActiveRecord::Base
+    belongs_to :user
+    belongs_to :budget
+    belongs_to :geozone
+
+    has_many :lines, dependent: :destroy
+    has_many :spending_proposals, through: :lines
+  end
+end
diff --git a/app/models/budget/ballot/line.rb b/app/models/budget/ballot/line.rb
new file mode 100644
index 000000000..01b320579
--- /dev/null
+++ b/app/models/budget/ballot/line.rb
@@ -0,0 +1,9 @@
+class Budget
+  class Ballot
+    class Line < ActiveRecord::Base
+      belongs_to :ballot
+      belongs_to :investment
+
+    end
+  end
+end
diff --git a/app/models/budget/investment.rb b/app/models/budget/investment.rb
new file mode 100644
index 000000000..ba4a63589
--- /dev/null
+++ b/app/models/budget/investment.rb
@@ -0,0 +1,201 @@
+class Budget
+  class Investment < ActiveRecord::Base
+
+    include Measurable
+    include Sanitizable
+    include Taggable
+    include Searchable
+
+    acts_as_votable
+    acts_as_paranoid column: :hidden_at
+    include ActsAsParanoidAliases
+
+    belongs_to :author, -> { with_hidden }, class_name: 'User', foreign_key: 'author_id'
+    belongs_to :geozone
+    belongs_to :administrator
+
+    has_many :valuation_assignments, dependent: :destroy
+    has_many :valuators, through: :valuation_assignments
+    has_many :comments, as: :commentable
+
+    validates :title, presence: true
+    validates :author, presence: true
+    validates :description, presence: true
+    validates_presence_of :unfeasibility_explanation, if: :unfeasibility_explanation_required?
+
+    validates :title, length: { in: 4..Investment.title_max_length }
+    validates :description, length: { maximum: Investment.description_max_length }
+    validates :terms_of_service, acceptance: { allow_nil: false }, on: :create
+
+    scope :sort_by_confidence_score, -> { reorder(confidence_score: :desc, id: :desc) }
+    scope :sort_by_price,            -> { reorder(price: :desc, confidence_score: :desc, id: :desc) }
+    scope :sort_by_random,           -> { reorder("RANDOM()") }
+
+    scope :valuation_open,         -> { where(valuation_finished: false) }
+    scope :without_admin,          -> { valuation_open.where(administrator_id: nil) }
+    scope :managed,                -> { valuation_open.where(valuation_assignments_count: 0).where("administrator_id IS NOT ?", nil) }
+    scope :valuating,              -> { valuation_open.where("valuation_assignments_count > 0 AND valuation_finished = ?", false) }
+    scope :valuation_finished,     -> { where(valuation_finished: true) }
+    scope :feasible,               -> { where(feasible: true) }
+    scope :unfeasible,             -> { valuation_finished.where(feasible: false) }
+    scope :not_unfeasible,         -> { where("feasible IS ? OR feasible = ?", nil, true) }
+    scope :with_supports,          -> { where('cached_votes_up > 0') }
+
+    scope :by_budget,   -> (budget_id)   { where(budget_id: budget_id) }
+    scope :by_admin,    -> (admin_id)    { where(administrator_id: admin_id) }
+    scope :by_tag,      -> (tag_name)    { tagged_with(tag_name) }
+    scope :by_valuator, -> (valuator_id) { where("valuation_assignments.valuator_id = ?", valuator_id).joins(:valuation_assignments) }
+
+    scope :for_render,             -> { includes(:geozone) }
+
+    scope :with_geozone,           -> { where.not(geozone_id: nil) }
+    scope :no_geozone,             -> { where(geozone_id: nil) }
+
+    before_save :calculate_confidence_score
+    before_validation :set_responsible_name
+
+    def self.filter_params(params)
+      params.select{|x,_| %w{geozone_id administrator_id tag_name valuator_id}.include? x.to_s }
+    end
+
+    def self.scoped_filter(params, current_filter)
+      results = self.by_budget(params[:budget_id])
+      if params[:max_for_no_geozone].present? || params[:max_per_geozone].present?
+        results = limit_results(results, params[:max_per_geozone].to_i, params[:max_for_no_geozone].to_i)
+      end
+      results = results.by_geozone(params[:geozone_id])             if params[:geozone_id].present?
+      results = results.by_admin(params[:administrator_id])         if params[:administrator_id].present?
+      results = results.by_tag(params[:tag_name])                   if params[:tag_name].present?
+      results = results.by_valuator(params[:valuator_id])           if params[:valuator_id].present?
+      results = results.send(current_filter)                        if current_filter.present?
+      results.includes(:geozone, administrator: :user, valuators: :user)
+    end
+
+    def self.limit_results(results, max_per_geozone, max_for_no_geozone)
+      return results if max_per_geozone <= 0 && max_for_no_geozone <= 0
+
+      ids = []
+      if max_per_geozone > 0
+        Geozone.pluck(:id).each do |gid|
+          ids += Investment.where(geozone_id: gid).order(confidence_score: :desc).limit(max_per_geozone).pluck(:id)
+        end
+      end
+
+      if max_for_no_geozone > 0
+        ids += Investment.no_geozone.order(confidence_score: :desc).limit(max_for_no_geozone).pluck(:id)
+      end
+
+      conditions = ["investments.id IN (?)"]
+      values = [ids]
+
+      if max_per_geozone == 0
+        conditions << "investments.geozone_id IS NOT ?"
+        values << nil
+      elsif max_for_no_geozone == 0
+        conditions << "investments.geozone_id IS ?"
+        values << nil
+      end
+
+      results.where(conditions.join(' OR '), *values)
+    end
+
+    def searchable_values
+      { title              => 'A',
+        author.username    => 'B',
+        geozone.try(:name) => 'B',
+        description        => 'C'
+      }
+    end
+
+    def self.search(terms)
+      self.pg_search(terms)
+    end
+
+    def self.by_geozone(geozone)
+      where(geozone_id: geozone == 'all' ? nil : geozone.presence)
+    end
+
+    def undecided?
+      feasibility == "undecided"
+    end
+
+    def feasible?
+      feasibility == "feasible"
+    end
+
+    def unfeasible?
+      feasibility == "unfeasible"
+    end
+
+    def unfeasibility_explanation_required?
+      unfeasible? && valuation_finished?
+    end
+
+    def total_votes
+      cached_votes_up + physical_votes + delegated_votes - forum_votes
+    end
+
+    def delegated_votes
+      count = 0
+      representative_voters.each do |voter|
+        count += voter.forum.represented_users.select { |u| !u.voted_for?(self) }.count
+      end
+      return count
+    end
+
+    def code
+      "B#{budget_id}I#{id}"
+    end
+
+    def reason_for_not_being_selectable_by(user)
+      return permission_problem(user) if permission_problem?(user)
+
+      return :not_voting_allowed unless budget.selecting?
+    end
+
+    def reason_for_not_being_ballotable_by(user, ballot)
+      return permission_problem(user)    if permission_problem?(user)
+      return :no_ballots_allowed         unless budget.balloting?
+      return :different_geozone_assigned unless geozone_id.blank? || ballot.blank? || geozone_id == ballot.geozone_id || ballot.geozone_id.nil?
+      return :not_enough_money           unless enough_money?(ballot)
+    end
+
+    def permission_problem(user)
+      return :not_logged_in unless user
+      return :organization  if user.organization?
+      return :not_verified  unless user.can?(:vote, SpendingProposal)
+      return nil
+    end
+
+    def permission_problem?(user)
+      permission_problem(user).present?
+    end
+
+    def selectable_by?(user)
+      reason_for_not_being_selectable_by(user).blank?
+    end
+
+    def ballotable_by?(user)
+      reason_for_not_being_ballotable_by(user).blank?
+    end
+
+    def enough_money?(ballot)
+      return true if ballot.blank?
+      available_money = ballot.amount_available(geozone)
+      price.to_i <= available_money
+    end
+
+    def register_selection(user)
+      vote_by(voter: user, vote: 'yes') if selectable_by?(user)
+    end
+
+    def calculate_confidence_score
+      self.confidence_score = ScoreCalculator.confidence_score(total_votes, total_votes)
+    end
+
+    def set_responsible_name
+      self.responsible_name = author.try(:document_number) if author.try(:document_number).present?
+    end
+
+  end
+end