Your income increased over the years. That does not mean that you will definitely be required to retroactively adjust upwards your child support payments. Many people believe that if your income has gone up, then a retroactive adjustment simplistically and automatically follows. Keown v. Mainer (Man. Q.B.) reminds us that the analysis here is much more nuanced. A careful reading of the Supreme Court of Canada decision of S. (D.B.) v. G. (S.R.) (known as "D.B.S." for short which is extensively referenced in Keown v. Mainer, assists in the analysis. To help one understand the factors at play, read Keown v. Mainer. If you are a really keen investigator, then try to read D.B.S.. This blog post can be your basic introduction to the retroactive child support issue.

When you are served with a claim for retro increased child support, you first need to ask if the child is still entitled to child support at all. In our office we have seen cases where the support recipient tries to assert a retro claim for a child support increased payment at a time when the child is really no longer a "child" legally speaking that is. If the "child" is no longer legally a "child" at the time the Application is served, then perhaps a motion to strike the claim should be contemplated; the motion might very well succeed. But beware. Keown v. Mainer also reminds us that there is no presumption that child support terminates then either. Still, what is encouraging is that the support recipient has a legal onus to prove that an adult child still is still legally entitled to support.

Once we have established that the claim for retroactive increased child support is (or may have been perceived to have been) brought prior to the termination date of the support order, we then go on to consider a number of factors that will impact the decision as to whether or not to order a retroactive increase in the amount of child support:

1. Reasonable Excuse for Why Support Was Not Sought Earlier (Delay)

If the claimant cannot advance a credible reason for delaying the application, then the support recipient will have a good argument to have the claim dismissed.

2. Conduct of the Payor Parent (Blameworthy Conduct)

If you are the support payor, it would have been a good idea to have made annual financial disclosure. That will hold you in good stead indeed. In Keown v. Mainer the previous order required both parents to make this disclosure but neither did. Nonetheless, in light of all of the facts in that particular case, the payor's failure to make annual disclosure was not fatal to his case. If you are the payor and you have kept your payments up to date on a timely basis, then you will be sitting in a very good position. The less the difference in what you paid versus what you should have paid on your increased income is also a helpful factor. In other words, if as the payor you acted reasonably, you will be ahead of the game, so to speak.

3. Circumstances Of The Child

If the child really did not suffer all that much from the reduced support (for example, the custodial parent earned a decent income), then a retro increase will be less likely.

4. Hardship To The Payor

Believe it or not, the law is supposed to take cognisance of hardship that might be caused to a support payor who had faithfully paid under a court order and is now taken by surprise with a demand to pay thousands in retro support. This "hardship" is different from the "undue hardship" factor under section 10 of the Child Support Guidelines. If the support payor is seeking a retroactive reduction to his support payments (ie. trying to cancel accumulated arrears), then do not expect a favourable reception from the court on this factor.


Do not assume that an underpayment of child support when later compared to increased income automatically results in a retroactive increase. It's not just a matter of an arithmetical exercise to recalculate child support. As I have discussed above, the Keown v. Mainer type of analysis is much more nuanced. We need to examine certain factors and then come to a reasoned conclusion. There is room for negotiation. There is room for argument.


I have been paying child support to a 23 year old who has her own family, the mother has been claiming the money, is that right?

That does not look quite right to me. There are time limits with respect to child support. Marriage is one of them. I would think that common law marriage should do the trick these days. In addition, once a "child" is independent of his/her parent, then child support is not normally paid. If you have not done so already, you should consult a family law lawyer.

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