Canada Family Law
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In general, if one spouse earns more money than the other spouse, he/she may have to pay spousal support. There is no set formula for the amount of alimony, although there are a set of non binding spousal support guidelines that judges and lawyers follow. Despite this, spousal support is decided on a case-by-case basis, and there is a lot of variability in the results.
Neil, Asad isn't wrong but there's more information needed to answer you better.
What province are you in?
Have you been ordered to pay a specific amount already, and you want to know the maximum garnishment on your income?
Is the spousal support a final order or a temporary one?