Share out a tax return (5)

I believe the answer is:

allot

'share out' is the definition.
(allotting is a kind of sharing out)

'a tax return' is the wordplay.
'tax' becomes 'toll' (I've seen this in another clue).
'return' is a reversal indicator.
'toll' written backwards gives 'llot'.
'a'+'llot'='ALLOT'

(Other definitions for allot that I've seen before include "Earmark" , "Dedicate" , "Assign (to someone)" , "Assign or distribute" , "Ration" .)

I've seen this clue in the Sydney Morning Herald and The Globe and Mail.

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