You could post your solution then: it would benefit future readers that run into the same problem.

A possible solution is to get rid of redundant joins and use a crosstab:

SELECT

ls.accid,

ls.TerminationDate,

MAX(CASE P.inum WHEN @inum_5 THEN P.lchg END),

MAX(CASE P.inum WHEN @inum_8 THEN P.lchg END),

MAX(CASE TL.inum WHEN @inum_5 THEN TL.lchg END),

MAX(CASE TL.inum WHEN @inum_8 THEN TL.lchg END),

MAX(CASE T.inum WHEN @inum_5 THEN T.lchg END),

MAX(CASE T.inum WHEN @inum_9 THEN T.lchg END),

MAX(CASE T.inum WHEN @inum_7 THEN T.lchg END),

MIN(PF.lchg)

FROM

#LS AS ls

LEFT OUTER JOIN #pos AS P

ON ls.accid = p.accid

AND ls.bid = P.bid

AND ls.oid = P.oid

AND P.inum IN (@inum_5,@inum_8)

LEFT OUTER JOIN #TL AS TL

ON ls.accid = TL.accid

AND ls.bid = TL.bid

AND ls.oid = TL.oid

AND TL.inum IN (@inum_5,@inum_8)

LEFT OUTER JOIN #Txn AS T

ON ls.accid = T.accid

AND ls.bid = T.bid

AND ls.oid = T.oid

AND T.inum IN (@inum_5,@inum_9,@inum_7)

AND CASE

WHEN T.inum = @inum7 AND T.fld4_tms = DATEADD(YEAR, 1, @EndDate) THEN 1

WHEN T.inum IN (@inum_5, @inum_9) THEN 1

ELSE 0

END

LEFT OUTER JOIN #Prfmce PF

ON ls.accid = PF.accid

GROUP BY ls.accid,ls.TerminationDate

ORDER BY ls.accid;