An amount paid as one lump-sum will generally not be considered a support payment because it is not paid on a periodic basis.
However, if periodic payments required by a court order or written agreement have fallen into arrears and one payment is made to bring these requirements up to date, that payment would be considered a support payment.
The following are generally not support payments:
For more information, see Interpretation Bulletin IT530, Support Payments.
Example
Jason and Tracy have been living separate and apart since August 2009. Their court order requires Jason to pay $500 per month for the Tracy's maintenance. In June 2010, Jason lost his job and was unable to make the spousal support payments. In February 2011, he got a new job. He is in arrears of $4,000. Jason and Tracy returned to court and reached a settlement where it was agreed that Jason will pay $3,500 of the $4000 he owes, the other $500 will not be paid.
The $3,500 lump-sum payment is considered a settlement amount paid by Jason to release him from his liability for the arrears and therefore does not qualify as a support payment because it was not made in accordance with the original agreement.