PIGEON,
      J.
      (all
      concur)
      :—Appellant
      is
      a
      used
      car
      dealer
      also
      
      
      selling
      new
      cars
      to
      a
      limited
      extent.
      Credit
      notes
      are
      sometimes
      
      
      given
      in
      partial
      payment
      of
      used
      cars
      acquired
      for
      resale.
      In
      such
      
      
      case,
      the
      cash
      payment
      and
      the
      amount
      of
      the
      credit
      note
      are
      
      
      stated
      in
      the
      bill
      of
      sale.
      The
      note
      is
      signed
      by
      both
      parties
      
      
      and
      the
      conditions
      are
      set
      forth
      on
      its
      face.
      These
      are
      that:
      
      
      
      
    
      1.
      It
      is
      not
      transferable;
      
      
      
      
    
      2.
      It
      is
      valid
      only
      within
      a
      stated
      delay,
      usually
      between
      
      
      one
      and
      two
      years;
      
      
      
      
    
      3.
      It
      is
      good
      only
      for
      the
      purchase
      of
      a
      car
      of
      not
      less
      than
      
      
      a
      stated
      value.
      
      
      
      
    
      Sometimes
      the
      credit
      note
      would
      be
      good
      for
      the
      purchase
      of
      
      
      a
      new
      car
      but
      generally
      it
      was
      good
      for
      the
      purchase
      of
      any
      used
      
      
      car
      owned
      by
      the
      appellant
      of
      not
      less
      than
      a
      specified
      value.
      
      
      The
      price
      of
      the
      cars
      offered
      for
      sale
      was
      posted
      but,
      of
      course,
      
      
      bargaining
      was
      not
      excluded.
      In
      appellant’s
      accounts
      credit
      
      
      notes
      outstanding
      were
      treated
      as
      current
      liabilities..
      If
      they
      
      
      were
      not
      redeemed,
      the
      amount
      at
      expiration
      was
      removed
      from
      
      
      accounts
      payable
      and
      treated
      as
      a
      profit.
      
      
      
      
    
      In
      1965,
      the
      Minister
      took
      the
      view
      that
      the
      outstanding
      
      
      credit
      notes
      were
      not
      existing
      liabilities
      and
      should
      be
      disallowed
      
      
      for
      tax
      purposes
      as
      being
      contingent.
      On
      that
      basis,
      re-assessments
      
      
      were
      issued
      whereby
      additional
      tax
      was
      levied
      for
      appellant’s
      
      
      1961,
      1962
      and
      1963
      taxation
      year
      disallowing
      $4,415,
      
      
      $9,870
      and
      $1,615
      in
      those
      years
      respectively.
      By
      judgment
      dated
      
      
      December
      23,
      1966
      signed
      by
      Maurice
      Boisvert,
      the
      Tax
      Appeal
      
      
      Board
      allowed
      the
      taxpayer’s
      appeal.
      This
      judgment
      was
      reversed
      
      
      by
      Gibson,
      J.
      on
      further
      appeal
      to
      the
      Exchequer
      Court
      
      
      (March
      13,
      1968).
      
      
      
      
    
      On
      the
      appeal
      to
      this
      Court,
      counsel
      for
      the
      Minister
      contended
      
      
      that
      when
      appellant
      issued
      each
      credit
      note
      there
      was
      
      
      not,
      in
      fact,
      created
      any
      contract
      or
      agreement
      which
      would
      
      
      give
      rise
      to
      any
      liability
      or
      obligation
      because,
      in
      particular,
      
      
      there
      was
      no
      agreement
      as
      to
      the
      price
      or
      the
      model
      of
      car
      
      
      which
      could
      be
      purchased
      by
      the
      customer
      upon
      presentment
      of
      
      
      the
      credit
      note.
      This
      contention
      cannot
      be
      upheld.
      The
      credit
      
      
      note
      should
      not
      be
      considered
      apart
      from
      the
      transaction
      out
      
      
      of
      which
      it
      arises.
      It
      is
      part
      of
      the
      consideration
      for
      an
      executed
      
      
      contract,
      the
      purchase
      of
      a
      used
      car.
      Under
      that
      contract,
      
      
      appellant
      became
      obliged
      to
      pay
      a
      stated
      sum
      of
      money,
      a
      part
      
      
      only
      of
      that
      sum
      was
      paid
      in
      cash,
      the
      balance
      remaining
      due
      
      
      was
      stipulated
      payable
      in
      merchandise
      of
      a
      stated
      kind.
      While
      
      
      the
      contract
      is
      spelled
      out
      in
      two
      separate
      documents,
      the
      bill
      
      
      of
      sale
      and
      the
      credit
      note,
      the
      latter
      cannot
      be
      considered
      
      
      otherwise
      than
      as
      evidence
      of
      the
      conditions
      of
      the
      obligation
      
      
      to
      pay
      the
      balance
      of
      the
      purchase
      price.
      That
      obligation
      must
      
      
      be
      considered
      as
      subsisting
      until
      satisfied
      or
      expired.
      No
      special
      
      
      reason
      was
      advanced,
      no
      authority
      was
      cited
      to
      support
      the
      
      
      contention
      that
      the
      credit
      note
      should
      be
      considered
      otherwise.
      
      
      
      
    
      The
      fact
      that
      the
      merchandise
      to
      be
      obtained
      by
      virtue
      of
      a
      
      
      credit
      note
      was
      not
      specified
      does
      not
      mean
      that
      appellant’s
      
      
      customer
      had
      no
      enforceable
      obligation
      for
      the
      balance
      due.
      
      
      He
      could
      select
      any
      of
      the
      cars
      offered
      for
      sale
      coming
      within
      
      
      the
      general
      description
      in
      his
      credit
      note
      and
      require
      delivery
      
      
      by
      tendering
      the
      note
      and
      cash
      to
      make
      up
      the
      posted
      price.
      
      
      Appellant
      could
      not
      have
      evaded
      this
      obligation
      by
      posting
      
      
      inflated
      prices.
      This
      would
      have
      been
      a
      fraud
      against
      which
      the
      
      
      credit
      note
      holder
      would
      have
      been
      entitled
      to
      a
      remedy.
      
      
      
      
    
      Even
      if
      the
      credit
      notes
      were
      to
      be
      considered
      by
      themselves
      
      
      they
      could
      not
      be
      considered
      as
      unenforceable
      for
      indefiniteness.
      
      
      It
      should
      be
      noted
      that
      Viscount
      Dunedin’s
      dictum
      in
      
        May
       
        &
      
        Butcher
      
      v.
      
        The
       
        King
      
      (Feb.
      22,
      1929,
      reported
      [1934]
      2
      K.B.
      17)
      :
      
      
      
      
    
        To
        be
        a
        good
        contract
        there
        must
        be
        a
        concluded
        bargain,
        and
        a
        
        
        concluded
        contract
        is
        one
        which
        settles
        everything
        that
        is
        necessary
        
        
        to
        be
        settled
        and
        leaves
        nothing
        to
        be
        settled
        by
        agreement
        between
        
        
        the
        parties.
        
        
        
        
      
      was
      explained
      in
      a
      
        later
      
      decision
      of
      the
      House
      of
      Lords,
      
        Hillas
       
        &
      
        Co.
      
      v.
      
        Arcos
       
        Ltd.,
      
      [1932]
      All
      E.R.
      494.
      Reversing
      a
      judgment
      
      
      of
      the
      Court
      of
      Appeal
      based
      on
      it
      Lord
      Wright
      said
      (at
      pp.
      
      
      507-508)
      :
      
      
      
      
    
        When
        the
        learned
        lord
        justice
        speaks
        of
        essential
        terms
        not
        being
        
        
        precisely
        determined,
        1.e.,
        by
        express
        terms
        of
        the
        contract,
        he
        is,
        
        
        I
        venture
        with
        respect
        to
        think,
        wrong
        in
        deducing
        as
        a
        matter
        
        
        of
        law
        that
        they
        must,
        therefore,
        be
        determined
        by
        a
        subsequent
        
        
        contract;
        he
        is
        ignoring,
        as
        it
        seems
        to
        me,
        the
        legal
        implication
        
        
        in
        contracts
        of
        what
        is
        reasonable,
        which
        runs
        throughout
        the
        
        
        whole
        of
        modern
        English
        law
        in
        relation
        to
        business
        contracts.
        To
        
        
        take
        only
        one
        instance,
        in
        
          Hoadly
         
          v.
         
          McLaine,
        
        Tindal
        C.J.
        (after
        
        
        quoting
        older
        authority),
        said
        (10
        Bing.
        at
        p.
        487)
        :
        
        
        
        
      
        “What
        is
        implied
        by
        law
        is
        as
        strong
        to
        bind
        the
        parties
        as
        if
        
        
        it
        were
        under
        their
        hand.
        This
        is
        a
        contract
        in
        which
        the
        
        
        parties
        are
        silent
        as
        to
        price,
        and
        therefore
        leave
        it
        to
        the
        law
        
        
        to
        ascertain
        what
        the
        commodity
        contracted
        for
        is
        reasonably
        
        
        worth.”
        
        
        
        
      
      That
      decision
      was
      relied
      on
      by
      Estey,
      J.
      in
      
        Dawson
      
      v.
      
        Helicopter
      
        Exploration
       
        Co.
       
        Ltd.,
      
      [1955]
      S.C.R.
      868
      at
      878.
      
      
      
      
    
      Respondent’s
      second
      contention
      is
      that
      because
      appellant’s
      
      
      obligation
      was
      conditional
      it
      should
      not,
      until
      the
      condition
      was
      
      
      realized,
      be
      treated
      for
      purposes
      of
      income
      tax
      as
      a
      current
      
      
      liability
      but
      as
      an
      amount
      properly
      to
      be
      entered
      in
      a
      contingent
      
      
      account.
      As
      a
      result,
      the
      deduction
      would
      be
      prohibited
      by
      Section
      
      
      12(1)
      (e)
      of
      the
      
        Income
       
        Tax
       
        Act:
      
        12.
        (1)
        In
        computing
        income,
        no
        deduction
        shall
        be
        made
        in
        
        
        respect
        of
        
        
        
        
      
        (e)
        an
        amount
        transferred
        or
        credited
        to
        a
        reserve,
        contingent
        
        
        account
        or
        sinking
        fund
        except
        as
        expressly
        permitted
        by
        
        
        this
        Part,
        
        
        
        
      
      The
      wording
      of
      that
      provision
      clearly
      refers
      to
      accounting
      practice.
      
      
      The
      only
      expression
      applicable
      to
      the
      present
      case
      is
      not
      
      
      “contingent
      liability”
      but
      ‘‘contingent
      account’’.
      This
      means
      
      
      that
      the
      provision
      is
      to
      be
      construed
      by
      reference
      to
      proper
      
      
      accounting
      practice
      in
      a
      business
      of
      the
      kind
      with
      which
      one
      is
      
      
      concerned.
      In
      the
      present
      case,
      the
      only
      evidence
      of
      accounting
      
      
      practice
      is
      that
      of
      appellant’s
      auditor,
      a
      chartered
      accountant.
      
      
      His
      testimony
      shows
      that
      in
      appellant’s
      accounts
      credit
      notes
      
      
      are
      treated
      according
      to
      standard
      practice
      as
      current
      liabilities
      
      
      until
      they
      are
      redeemed
      or
      expired.
      They
      are
      not
      classed
      as
      
      
      eontingent
      liabilities.
      When
      asked
      why
      he
      considered
      the
      obligation
      
      
      under
      a
      credit
      note
      as
      current
      liability
      and
      the
      obligation
      
      
      under
      a
      warranty
      as
      contingent,
      he
      said:
      
      
      
      
    
        .
        .
        .
        the
        credit
        note,
        while
        it
        is
        a
        liability,
        is
        also
        an
        existing
        obligation
        
        
        today.
        A
        warranty
        may
        be
        a
        liability
        in
        the
        future.
        It
        may
        
        
        be
        determinable
        in
        the
        future
        but
        isn’t
        an
        existing
        obligation
        until
        
        
        the
        future.
        At
        least,
        this
        is
        my
        interpretation
        of
        the
        difference.
        
        
        
        
      
      With
      respect,
      Gibson,
      J.
      was
      in
      error
      in
      holding
      that
      whether
      
      
      or
      not
      appellant’s
      financial
      statements
      were
      drawn
      up
      according
      
      
      to
      generally
      accepted
      accounting
      principles
      they
      could
      be
      
      
      disregarded.
      On
      the
      contrary,
      the
      wording
      of
      the
      relevant
      provision
      
      
      of
      the
      
        Income
       
        Tax
       
        Act
      
      implies
      that
      this
      is
      the
      essential
      
      
      question.
      
      
      
      
    
      The
      appeal
      should
      be
      allowed
      and
      the
      judgment
      of
      the
      Exchequer
      
      
      Court
      set
      aside,
      with
      costs
      both
      in
      this
      Court
      and
      in
      the
      
      
      Court
      below;
      and
      it
      should
      be
      ordered
      that
      the
      re-assessments
      
      
      of
      the
      taxation
      years
      1961,
      1962
      and
      1963
      be
      referred
      back
      to
      
      
      the
      Minister
      of
      National
      Revenue
      for
      re-assessments
      and
      adjustments
      
      
      in
      accordance
      with
      these
      reasons.