Scott,
A.C.J.
Q.B.:—
This
is
one
of
the
first
motions
before
the
court
in
which
we
have
been
asked
to
apply
Queen's
Bench
Rule
20.03.
The
facts
briefly
are
that
on
November
18,
1986,
the
plaintiff
received
a
third
party
demand
from
Revenue
Canada
with
respect
to
its
then
employee,
the
defendant.
The
demand
was
in
the
amount
of
$5,362.91,
and
by
its
terms
required
the
plaintiff
to
pay,
up
to
that
amount,
sums
due,
owing
and
payable
by
the
plaintiff
to
the
defendant,
to
Revenue
Canada.
The
notice
clearly
stated
that
failure
to
comply
with
the
requirement
to
pay,
in
the
above-noted
circumstances,
would
render
Canada
Trust
personally
liable
to
pay.
At
the
time
the
requirement
to
pay
was
served,
the
defendant
was
owed
the
sum
of
$18,694
in
back
real
estate
commissions,
which
sum
in
fact
was
remitted
within
the
period
of
the
next
60
days
by
way
of
a
series
of
partial
payments
to
the
defendant,
without
deduction.
Thereafter,
on
February
3,
1987,
at
which
time
the
defendant
was
no
longer
employed
by
the
plaintiff
and
was
owed
no
funds,
the
plaintiff
paid
the
sum
of
$5,362.91
to
Revenue
Canada,
as
required
by
the
third
party
notice.
The
plaintiff
had
inadvertently
failed
to
note
in
its
accounting
records
that
the
third
party
notice
had
been
received;
hence
failed
to
deduct
the
agreed
amount
prior
to
paying
the
defendant,
prior
to
his
departure,
all
amounts
due
and
owing.
The
plaintiff
now
sues
to
recover
this
amount.
Relying
on
the
now-classic
redefinition
of
unjust
enrichment
found
in
the
recent
Supreme
Court
of
Canada
decision
of
Pettkus
v.
Becker,
[1980]
2
S.C.R.
834;
117
D.L.R.
(3d)
257,
and
in
particular
the
following
quotations
from
Dickson,
J.
(as
he
then
was)
at
page
848:
How
then
does
one
approach
the
question
of
unjust
enrichment
in
matrimonial
causes?
In
Rathwell
I
ventured
to
suggest
there
are
three
requirements
to
be
satisfied
before
an
unjust
enrichment
can
be
said
to
exist:
an
enrichment,
a
corresponding
deprivation
and
absence
of
any
juristic
reason
for
the
enrichment.
This
approach,
it
seems
to
me,
is
supported
by
general
principles
of
equity
that
have
been
fashioned
by
the
courts
for
centuries,
though,
admittedly,
not
in
the
context
of
matrimonial
property
controversies.
.
.
.
It
must,
in
addition,
be
evident
that
the
retention
of
the
benefit
would
be
“unjust”
in
the
circumstances
of
the
case.
There
is,
says
the
defendant,
no
juristic
reason
for
the
retention
of
the
benefit
by
the
defendant,
and
it
is
unjust
for
him
to
do
so.
The
defendant,
on
the
other
hand,
relies
on
traditional
authority,
which
stands
for
the
proposition
that
voluntary
payments
made
by
one
individual
in
favour
of
another,
in
error,
but
without
inducements
or
intervention
by
the
beneficiary,
does
not
entitle
the
payor
to
recover
the
funds
from
the
payee
(see
the
Saskatchewan
Court
of
Appeal
decisions
in
Barish
&
Co.
v.
Biss
et
al.,
[1925]
3
D.L.R.
738;
[1925]
2
W.W.R.
518,
McKissick,
Alcorn,
Magnus
&
Company,
[1928]
3
W.W.R.
509;
and
Marsh
v.
Royal
Bank
of
Canada,
[1922]
1
W.W.R.
486;
63
D.L.R.
659.)
Counsel
for
the
defendant
asked
that
the
application
for
summary
judgment
be
dismissed.
Although
it
is
not
contested
by
the
defendant
that
at
all
material
times
the
sum
of
$5,362.91
was
owed
by
him
to
Revenue
Canada,
the
defendant
states
he
has
been
prejudiced
by
the
plaintiffs
voluntary
payment,
in
that
he
might
have
been
able
to
negotiate
arrangements
or
terms
for
payment
more
satisfactory
to
him.
There
is
also
the
question
whether
the
payment
was
made
under
a
mistake
of
fact.
In
Dominion
Securities
Limited
v.
Toronto-Dominion
Bank
and
Bodak
(1983),
24
Man.
R.
(2d)
235,
Simonsen,
J.
of
this
court
had
occasion
to
review
the
four
essential
conditions
precedent
for
recovery
of
moneys
paid
under
a
mistake
of
fact.
In
so
doing,
he
relied
upon
the
judgment
of
Dysart,
J.
in
Royal
Bank
of
Canada
v.
Regem,
[1931]
1
W.W.R.
709;
[1931]
2
D.L.R.
685,
which
set
forth
the
four
essential
conditions
before
money
paid
under
an
alleged
mistake
of
fact
could,
in
fact,
be
recovered.
The
four
conditions
noted
are:
First,
that
the
mistake
is
honest.
There
must
be
on
the
part
of
the
person
paying
the
money
the
genuine
bone
(sic)
fide
belief
that
certain
facts
exist
which
really
do
not
exist.
It
is
not
what
he
ought
to
believe
of
what
he
ought
to
have
learned.
His
laches
or
negligence
will
not
of
themselves
affect
his
belief.
Knowledge
will
not
be
imputed
to
him;
however
ample
may
be
the
means
of
knowledge
which
he
has
on
hand,
or
however
readily
accessible
these
means
may
be,
they
do
not
constitute
knowledge;
and
knowledge
will
not
be
imputed
to
him
or
inferred
against
him,
unless
he
wilfully
abstains
from
enquiry.
The
second
condition
is
that
the
mistake
must
be
as
between
the
person
paying
and
the
person
receiving
the
money.
In
other
words,
the
receiver
must
in
some
way
be
a
party
to
the
mistake,
either
as
inducing
it,
or
as
responsible
for
it,
or
connected
with
it.
The
third
condition
is
that
the
facts,
as
they
are
believed
to
be
impose
an
obligation
to
make
the
payment:
Aiken
v.
Short
(1856)
1
H.
&
N.
210,
at
215,
L.J.
Ex.
321.
This
obligation
must
be
legal
or
equitable
or
moral,
as
will
appear
from
a
reading
of
the
cases
already
referred
to.
It
is
not
enough
that
the
compulsion
must
at
least
be
practical
The
fourth
condition
to
recovery
is
that
the
receiver
of
the
money
has
no
legal
or
equitable
or
moral
right
to
retain
the
money
as
against
the
payer.
This
proposition
is
not
the
exact
converse
of
the
third
condition.
The
money
may
be
owing
to
the
receiver
from
a
third
person
who
has
induced
the
payment,
but
the
existence
of
such
a
debt
is
not
enough
to
defeat
recovery.
The
decision
of
Simonsen,
J.
was
applied
by
Oliphant,
J.
in
the
more
recent
case
of
Pearson
v.
Treleaven,
[1987]
3
W.W.R.
276;
47
Man.
R.
(2d)
180.
It
is
submitted
by
counsel
for
the
defendant,
and
I
agree,
that
the
preconditions
for
application
of
the
doctrine
of
mistake
of
fact
do
not
exist
in
this
case,
firstly
because
the
mistake
of
fact
was
not
made
as
between
the
plaintiff
and
the
defendant,
but
rather
as
between
the
plaintiff
and
Revenue
Canada;
furthermore,
and
more
importantly,
the
first
condition
has
not
been
met,
in
my
opinion,
because
the
moneys
were
not
paid
by
the
plaintiff
under
the
mistaken
belief
in
certain
facts
existing
which
did
not
in
fact
exist.
By
the
time
the
payment
was
made,
Canada
Trust
was,
in
fact,
aware
that
they
had,
in
error,
paid
the
defendant
all
sums
due,
owing
and
payable
to
him.
Given
the
tenor
of
the
third
party
demand,
and
the
consequences
to
the
plaintiff
in
not
remitting
to
Revenue
Canada,
the
plaintiff
at
that
point
simply
had
no
recourse
but
to
remit.
We
are
left,
then,
with
a
claim
for
unjust
enrichment
and
restitution.
The
principles
surrounding
the
recovery
of
moneys
paid
under
compulsion
to
a
third
party
are
well
known
and
compendiously
referred
to
in
Hals.
(4th)
Vol.
9:
Contract,
under
"Quasi
Contract
and
Restitution”,
commencing
at
para.
630.
The
compulsion
may
be
founded
on
a
rule
of
common
law
or
upon
statute.
Generally,
"where
a
person
makes
a
payment
in
discharge
of
a
liability
incurred
in
consequence
of
his
own
negligence
or
breach
of
duty
.
.
.
no
contract
to
indemnify
him
will
be
implied.”
(Pitcher
v.
Bailey
(1807),
8
East
171,
[Hals.,
supra,
para.
648]).
In
Lambert
Implements
Ltd.
v.
Pardell
(1964),
50
W.W.R.
310
(Alta.
D.C.),
Cormack,
D.C.J.
refused
to
permit
a
plaintiff
to
recover
moneys
mistakenly
paid
to
the
benefit
of
another
because
the
so-called
compulsion,
in
fact,
arose
out
of
a
voluntary
agreement
entered
into
by
the
plaintiff.
The
case
may
be
distinguishable
on
the
grounds
that
the
compulsion
here
is
by
operation
of
law,
rather
than
by
the
voluntary
agreement
of
the
plaintiff,
but
in
my
opinion,
the
case
is
not
applicable
for
reasons
of
a
more
fundamental
nature.
In
Brooks
Wharf
&
Bull
Wharf,
Ltd.
v.
Goodman
Brothers,
[1936]
3
All
E.
Law
R.
Annotated
696
(C.A.)
the
court
was
concerned
with
a
situation
where
a
bonded
warehouseman
paid
customs
duties
because
it
would
have
been
an
offence
under
statute
if
the
sum
due
were
not
paid.
The
defendant
importers
were
held
liable
to
repay
the
plaintiffs.
In
the
reasons
of
Lord
Wright,
M.R.
the
obligation
of
the
defendant
to
reimburse
the
plaintiff
in
the
circumstances
of
that
case
was
put
on
a
very
broad
principle.
The
Master
of
the
Rolls
firstly
referred
to
the
case
of
Pownal
v.
Farrand
(1827),
6
B
&
C
439,
wherein
Lord
Tenterden,
C.J.
said,
at
page
443:
I
am
of
opinion
that
he
is
entitled
to
recover
upon
the
general
principle,
that
one
may,
who
is
compelled
to
pay
money
which
another
is
bound
by
law
to
pay,
is
entitled
to
be
reimbursed
by
the
latter.
Lord
Wright
then
went
on
to
say
(at
page
707):
These
statements
of
the
principle
do
not
put
the
obligation
on
any
ground
of
implied
contract
or
of
constructive
or
notional
contract.
The
obligation
is
imposed
by
the
court
simply
under
the
circumstances
of
the
case
and
on
what
the
court
decides
is
just
and
reasonable,
having
regard
to
the
relationship
of
the
parties.
.
.
.
All
the
court
can
say
is
what
they
ought
as
just
and
reasonable
men
to
have
decided
as
between
themselves.
The
defendants
would
be
unjustly
benefited
at
the
cost
to
the
plaintiffs
if
the
latter,
who
had
received
no
extra
consideration
and
made
no
express
bargain,
should
be
left
out
of
pocket
by
having
to
discharge
what
was
the
defendant's
debt.
This
line
of
reasoning,
in
my
opinion,
is
more
in
keeping
with
recent
decisions
in
this
country
dealing
with
unjust
enrichment
and
restitution.
Ultimately,
each
case
must
depend
on
its
own
facts.
The
facts
of
this
case,
as
noted
beforehand,
are
simple
and
straightforward.
In
a
nutshell,
the
question
is
whether
the
plaintiff
should
be
deprived
of
the
opportunity
to
recoup
the
payment
made
by
it,
solely
for
the
benefit
of
the
defendant,
due
to
its
internal
accounting
error.
In
my
opinion,
the
plaintiff
should
be
entitled
to
recover
the
payment
made.
In
the
recent
decisions
of
Air
Canada
v.
Canada,
[1989]
1
T.S.T.
2126,
three
of
the
six
judges
suggested
that
the
law
of
mistake
should
be
dealt
with
under
the
principles
of
unjust
enrichment
and
restitution,
and
that
recovery
should
generally
be
allowed
in
any
case
of
enrichment
at
the
plaintiffs
expense
caused
by
a
mistake,
subject
to
any
available
defences
or
equitable
reasons
for
denying
recovery.
In
my
view,
this
is
indicative
of
the
extent
to
which
the
law
in
this
area
has
developed
over
the
past
decade.
The
three
requirements
set
forth
in
Pettkus
v.
Becker,
supra,
have
all
been
met.
It
is
clear
that
the
only
genuine
issue
between
the
parties
is
a
question
of
law,
and
that
Rule
20.03(3)
is
applicable.
The
defendant
has
received
a
windfall
as
a
result
of
an
inadvertent
oversight
by
the
plaintiff's
accounting
personnel.
The
plaintiff
was
under
a
legal
compulsion
to
pay
the
moneys
to
Revenue
Canada
on
behalf
of
the
defendant
since
it
was
indebted
to
the
defendant
in
an
amount
sufficient
to
satisfy
the
third
party
demand
at
the
time
the
demand
was
served,
or
within
90
days
thereafter.
There
is
no
juristic
or
equitable
reason
for
the
enrichment.
I
do
not
accept
that
the
defendant
has
been
prejudiced
as
a
result
of
the
plaintiff
honouring
his
legal
obligation.
In
the
result,
I
would
grant
the
plaintiff's
application
for
summary
judgment
in
the
amount
claimed,
together
with
costs.
Application
granted.