Christie,
       
        A.C.J.T.C.:—By
      
      notice
      of
      appeal
      dated
      January
      17,
      1990,
      the
      appellant
      
      
      appealed
      from
      a
      reassessment
      by
      the
      respondent
      of
      her
      liability
      under
      the
      
      
      
        Income
       
        Tax
       
        Act,
      
      R.S.C.
      1952,
      c.
      148
      (am.
      S.C.
      1970-71-72,
      c.
      63)
      (the
      "Act")
      with
      
      
      reference
      to
      the
      1987
      taxation
      year.
      The
      address
      for
      the
      appellant
      given
      in
      the
      
      
      notice
      of
      appeal
      is
      91
      Bridlington
      Road,
      London,
      Ontario,
      N6E
      2G6.
      By
      notice
      of
      
      
      hearing
      dated
      March
      30,
      1990,
      the
      Registrar
      informed
      the
      appellant
      that
      the
      
      
      appeal
      was
      scheduled
      to
      be
      heard
      at
      London
      on
      April
      24,
      1990.
      The
      precise
      
      
      time
      and
      place
      of
      the
      hearing
      is
      set
      out
      in
      the
      notice.
      This
      document
      was
      sent
      
      
      to
      the
      appellant
      by
      registered
      mail
      at
      the
      Bridlington
      Road
      address,
      which
      was
      
      
      and
      is
      the
      appellant's
      home
      address.
      
      
      
      
    
      When
      the
      appeal
      was
      called
      for
      hearing
      before
      Deputy
      Judge
      Dubienski
      on
      
      
      April
      24,
      neither
      the
      appellant
      nor
      anyone
      representing
      her
      was
      present.
      In
      the
      
      
      result,
      judgment
      was
      signed
      by
      him
      on
      May
      22,
      1990,
      dismissing
      the
      appeal
      for
      
      
      want
      of
      prosecution.
      The
      appellant
      seeks
      to
      have
      the
      judgment
      set
      aside
      on
      
      
      the
      ground
      that
      she
      did
      not
      receive
      the
      notice
      of
      hearing.
      This
      motion
      came
      on
      
      
      for
      hearing
      at
      London
      on
      January
      15,1991.
      
      
      
      
    
      The
      appellant
      testified
      that
      she
      did
      not
      receive
      the
      notice
      of
      hearing.
      A
      
      
      notice
      that
      there
      was
      registered
      mail
      at
      a
      postal
      substation
      was
      received
      by
      her,
      
      
      and
      her
      husband
      endeavoured
      unsuccessfully
      to
      obtain
      it.
      She
      agreed
      that
      the
      
      
      notice
      about
      registered
      mail
      could
      have
      been
      related
      to
      the
      notice
      of
      hearing.
      
      
      
      
    
      Mr.
      Curoe
      testified
      that
      early
      in
      1990
      a
      notice
      to
      pick
      up
      registered
      mail
      was
      
      
      received.
      In
      the
      normal
      course
      his
      wife
      is
      at
      home
      when
      the
      mail
      is
      delivered
      
      
      but
      she
      must
      have
      been
      absent
      when
      that
      registered
      mail
      arrived.
      At
      any
      rate
      
      
      he
      went
      to
      the
      substation
      which
      was
      located
      in
      a
      Shoppers
      Drug
      Mart.
      The
      
      
      person
      in
      charge
      could
      not
      locate
      the
      letter.
      Mr.
      Curoe
      returned
      two
      days
      later
      
      
      and
      was
      informed
      that
      the
      substation
      at
      the
      drug
      mart
      was
      closing
      down
      and
      
      
      was
      being
      transferred
      to
      a
      7-Eleven
      variety
      store
      across
      the
      street.
      It
      was
      
      
      suggested
      that
      he
      inquire
      there
      and
      he
      did,
      without
      result.
      The
      substation
      was
      
      
      just
      being
      established
      in
      the
      7-Eleven
      and
      there
      was
      a
      good
      deal
      of
      confusion.
      
      
      He
      made
      a
      further
      inquiry
      there,
      again
      without
      result.
      He
      returned
      to
      the
      drug
      
      
      mart
      and
      was
      given
      the
      name
      and
      telephone
      number
      of
      a
      letter
      carrier
      
      
      supervisor,
      but
      he
      was
      unable
      to
      help.
      
      
      
      
    
      The
      first
      knowledge
      that
      the
      appellant
      had
      about
      the
      notice
      of
      hearing
      was
      
      
      after
      receiving
      a
      copy
      of
      Judge
      Dubienski's
      judgment.
      Mr.
      Curoe
      thereupon
      
      
      communicated
      with
      the
      Deputy
      Registrar
      of
      the
      Court,
      Mr.
      M.
      Artelle,
      who
      
      
      informed
      him
      about
      the
      notice
      of
      hearing
      having
      been
      sent
      by
      registered
      mail.
      
      
      
      
    
      There
      is
      no
      doubt
      that
      the
      appellant
      did
      not
      receive
      the
      notice
      of
      hearing.
      
      
      Apart
      from
      the
      affirmative
      credibility
      of
      the
      evidence
      given
      at
      the
      hearing
      of
      the
      
      
      motion,
      the
      matter
      is
      clinched
      by
      the
      Court
      file
      which
      shows
      that
      the
      unopened
      
      
      envelope
      containing
      the
      notice
      of
      hearing
      was
      returned
      by
      the
      Post
      
      
      Office
      to
      the
      Court
      and
      received
      by
      it
      on
      May
      2,
      1990.
      
      
      
      
    
      It
      is
      the
      contention
      of
      counsel
      for
      the
      respondent
      that
      this
      Court
      is
      without
      
      
      jurisdiction
      to
      set
      aside
      the
      judgment.
      The
      argument
      in
      support
      of
      this
      made
      
      
      reference
      to
      a
      number
      of
      reported
      cases.
      The
      nub
      of
      it
      is
      that
      when
      a
      judgment
      
      
      of
      this
      Court
      has
      been
      drawn
      up
      and
      entered
      there
      is
      no
      jurisdiction
      to
      amend
      
      
      it
      in
      the
      absence
      of
      express
      authority
      
      except
      (i)
      when
      there
      is
      error
      in
      it
      that
      is
      
      
      attributable
      to
      an
      accidental
      slip
      or
      omission,
      or
      (ii)
      error
      has
      been
      made
      in
      
      
      expressing
      the
      manifest
      intention
      of
      the
      Court.
      But
      this
      statement
      of
      the
      law
      is
      
      
      only
      applicable
      to
      the
      issue
      under
      discussion
      on
      the
      supposition
      that
      amending
      
      
      the
      terms
      of
      a
      judgment
      and
      setting
      it
      aside
      are
      synonymous.
      This
      is
      an
      
      
      assumption
      that
      to
      my
      mind
      is
      invalid.
      
      
      
      
    
      Counsel
      for
      the
      respondent
      made
      it
      clear,
      however,
      that
      there
      was
      considerable
      
      
      sympathy
      for
      the
      appellant's
      plight
      and
      she
      even
      suggested
      that
      if
      the
      
      
      appellant
      sought
      to
      appeal
      the
      judgment
      to
      the
      Federal
      Court-Trial
      Division,
      
      
      no
      impediment
      would
      be
      raised
      to
      that
      course
      of
      action.
      Nevertheless
      counsel
      
      
      was
      of
      the
      view
      that
      if
      a
      court
      is
      considered
      to
      be
      without
      jurisdiction,
      it
      is
      a
      
      
      matter
      that
      must
      be
      raised.
      I
      agree.
      Judgments
      or
      orders
      rendered
      without
      
      
      jurisdiction
      are
      a
      nullity
      and
      are
      to
      be
      stringently
      avoided.
      This
      is
      underscored
      
      
      by
      the
      inference
      to
      be
      drawn
      from
      what
      was
      done
      by
      the
      Court
      in
      
        Griffith
      
      v.
      
      
      
        Harwood
      
      (1900),
      30
      S.C.R.
      315,
      
      and
      said
      by
      Chief
      Justice
      Laskin
      in
      
        Novic
      
      v.
      
      
      
        Novic,
      
      [1983]
      1
      S.C.R.
      700;
      3
      D.L.R.
      (4th)
      184,
      
      that
      if
      a
      court
      believes
      it
      may
      be
      
      
      without
      jurisdiction
      and
      this
      has
      not
      been
      advanced
      by
      counsel,
      the
      issue
      
      
      should
      be
      raised
      by
      the
      court
      of
      its
      own
      accord.
      
      
      
      
    
      In
      my
      opinion
      this
      Court
      has
      jurisdiction
      to
      set
      aside
      a
      judgment
      issued
      ex
      
      
      
        parte.
      
      I
      regard
      that
      this
      flows
      from
      the
      decision
      of
      the
      Federal
      Court
      of
      Appeal
      
      
      in
      
        May
       
        &
       
        Baker
       
        (Canada)
       
        Ltd.
      
      v.
      
        Motor
       
        Tanker
       
        “Oak”,
      
      [1979]
      1
      F.C.
      401;
      89
      
      
      D.L.R.
      (3d)
      692.
      There
      a
      statement
      of
      claim
      had
      issued
      out
      of
      the
      Federal
      Court-
      
      
      Trial
      Division
      on
      October
      24,1972.
      An
      order
      of
      the
      Trial
      Division
      extended
      the
      
      
      time
      for
      service
      of
      it
      until
      October
      22,1974.
      A
      further
      extension
      of
      time
      for
      
      
      service
      was
      made
      on
      September
      30,
      1974
      until
      September
      30,
      1975.
      Both
      of
      
      
      these
      orders
      were
      made
      on
      ex
      
        parte
      
      applications.
      Service
      was
      effected
      on
      
      
      September
      9,
      1975,
      and
      on
      November
      3,
      1975,
      a
      motion
      was
      made
      in
      the
      Trial
      
      
      Division
      to
      set
      aside
      the
      service
      of
      the
      statement
      of
      claim“
      on
      the
      grounds
      that
      
      
      the
      extensions
      of
      time
      for
      service
      .
      .
      .
      were
      granted
      without
      sufficient
      reason."
      
      
      This
      application
      was
      dismissed
      on
      February
      24,
      1976,
      and
      the
      defendants
      
      
      appealed.
      
      
      
      
    
      The
      appeal
      was
      allowed.
      The
      Court
      of
      Appeal
      found
      that
      the
      material
      filed
      
      
      in
      the
      Trial
      Division
      in
      support
      of
      the
      two
      orders
      extending
      time
      for
      service
      did
      
      
      not
      reveal
      any
      facts
      that
      disclosed
      "sufficient
      reasons".
      It
      was
      also
      of
      the
      view
      
      
      that
      the
      motion
      in
      the
      Trial
      Division
      should
      be
      treated
      as
      a
      motion
      for
      an
      order
      
      
      to
      set
      aside
      the
      orders
      extending
      the
      time
      insofar
      as
      necessary
      to
      make
      a
      
      
      consequential
      order
      to
      set
      aside
      the
      service.
      
      
      
      
    
      Chief
      Justice
      Jackett,
      in
      delivering
      the
      judgment
      of
      the
      Court,
      said
      at
      pages
      
      
      404-405
      (D.L.R.
      695):
      
      
      
      
    
        Generally
        speaking,
        when
        a
        court
        makes
        an
        order
        or
        delivers
        a
        judgment,
        in
        
        
        the
        absence
        of
        special
        provision,
        it
        is
        without
        authority
        to
        review
        such
        order
        or
        
        
        judgment.
        Its
        correctness
        can
        only
        be
        dealt
        with
        on
        appeal.
        When,
        however,
        an
        
        
        order
        is
        made
        ex
        
          parte,
        
        in
        my
        view,
        in
        the
        absence
        of
        something
        to
        the
        contrary,
        
        
        there
        is
        an
        inherent
        jurisdiction
        in
        the
        Court,
        after
        the
        party
        adversely
        affected
        has
        
        
        been
        given
        an
        opportunity
        to
        be
        heard,
        if
        it
        then
        appears
        that
        the
        ex
        
          parte
        
        order
        or
        
        
        judgment
        should
        not
        have
        been
        made
        
        
        
        
      
        (a)
        to
        set
        aside
        the
        ex
        
          parte
        
        order
        or
        judgment
        as
        of
        the
        time
        when
        the
        order
        
        
        setting
        aside
        is
        made,
        and
        
        
        
        
      
        (b)
        to
        make
        such
        ancillary
        order
        as
        may
        be
        necessary
        to
        restore
        the
        party
        
        
        adversely
        affected
        to
        the
        position
        he
        would
        have
        been
        in
        if
        the
        
          ex
         
          parte
        
        order
        or
        
        
        judgment
        had
        not
        been
        made.
        
        
        
        
      
        It
        follows,
        in
        my
        view,
        that,
        in
        such
        a
        case,
        the
        party
        aggrieved
        is
        entitled,
        upon
        
        
        an
        application
        to
        set
        aside
        an
        ex
        
          parte
        
        order,
        to
        obtain
        such
        relief,
        and
        that
        the
        
        
        appellant,
        as
        such
        an
        aggrieved
        party,
        should
        have
        been
        granted
        such
        relief
        by
        the
        
        
        judgment
        that
        is
        the
        subject
        matter
        of
        this
        appeal.
        
      While
      it
      might
      be
      said
      that
      strictly
      speaking
      Jackett,
      C.J.
      was
      referring
      to
      ex
      
      
      
        parte
      
      orders
      and
      judgments
      issued
      out
      of
      the
      Federal
      Court-Trial
      Division,
      I
      
      
      see
      no
      reason
      why,
      on
      principle,
      what
      he
      said
      does
      not
      also
      apply
      to
      the
      Tax
      
      
      Court
      of
      Canada.
      
      
      
      
    
      The
      application
      to
      set
      aside
      the
      judgment
      dated
      May
      22,
      1990,
      is
      granted
      and
      
      
      the
      Registrar
      will
      be
      directed
      to
      reschedule
      the
      hearing
      of
      the
      appeal.
      
      
      
      
    
        Appeal
       
        allowed.