Kent Family Law Attorney.
No, only if you are NOT in agreement and headed toward trial.
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You can file to modify child support after two years, not three, without a showing of substantially changed circumstances; this could take into consideration a change in both of your incomes (if any). an "Adjustment" based on the change in age category could also be filed. See RCW 26.09.170.
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In King County, a Child Support Modification takes about four months...but if granted, the new Order can be retroactive to the date you filed your Petition to Modify.