The CSA Guide - 2.4.9: Assessments when a parent has multiple child support cases (Formulas 3 & 4) saidExplanation
Parents can have more than one child support case, that is, they have children of different relationships in child support assessments with more than one other parent. To recognise a parents responsibility to pay child support for the children in another child support case one of two separate mechanisms are used. These mechanisms are the:
multi-case allowance which is deducted from a parents adjusted taxable income to reach their child support income at step 1 of the basic formula (Section 47); and
multi-case cap which is a separate calculation for the paying parent worked out at step 8 (Section 55E).
For each child, the lesser of the two amounts calculated will be the assessed rate of child support. Only one mechanism functions at a time either the child support is worked out using the income after the deduction of the multi-case allowance, or the child support is worked out according to the multi-case cap on child support.
Note! that you can use the Advanced Calculator available from the home page to check multi-case scenarios.
Note! The CSA's estimator doesn't have the capability/functionality to calculate multi-case scenarios.
Note! That you would have to check the show calculations box to ascertain the multi-case allowance or cap, although if the CSA's assessed amount is different this may itself indicate that multi-case processing has not been undertaken.
Here's an example of a multi-case scenario and how to input the data.
Jim and Betty had a child and separated (C1). Jim then had a child (c2) with Kath and they separated. Jim has an Adjusted Taxable Income (ATI) of $70,000 both Betty and Kath are on income support and each receive $17,000. Jim has both children for 52 nights (14% care). Both children are under 13.
When the calculator appears select the appropriate year in the Year Selection area.
In the Adult Data section click on the Add Adult button and then input the ATI's for the adults (i.e. 70000 for Jim and 17000 for Betty and Kath). You can change the names from A1, A2 and A3 if you wish (the results may be more easily read).
In the Child/Relationship area click on the Add Child button to add the other children (a multi-case scenario must have more than the default of 1 child).
For C1 (you can rename the child if you wish) Jim and Betty are parents thus the relationship with Kath needs to be changed from Parent to Other as Kath is not a parent of C1. The number of nights care for Jim should be input as 52 and the care for Betty should be input as 313 (it will probably be set to 187 after inputting Jim's 52 nights care (Kath's care would be set to 186 and should change to 0 after changing Betty's care to 313)).
For C2 Jim and Kath are the parents thus the relationship with Betty needs to be changed from Parent to Other as Betty is not a parent of C2. The number of nights care for Jim should be input as 52 and the care for Betty should be input as 0 which should set Kath's care to 313 (it will probably be set to 187 after inputting Jim's 52 nights care (Kath's care would be set to 186 and should change to 313 after changing Betty's care to 0)).
If in your own scenario any children are over 13 ensure that you check the appropriate 13+ check box for the child.
If you wish to check the multi-case allowance/cap then click on the Show Calculations check box.
Click on the Calculate button.
If the amounts differ from the CSA's assessment the difference may be due to the multi-case not being correctly processed by the CSA.
If you wish to check the multi-case allowance cap then scroll through the results. The Multi-case Allowance (MCA) will be under the respective adult (in this case Jim). Noting that the results will be for 2 separate cases and thus data for Jim will appear twice. Once under "Calculations for Case 1 of 2" and again under "Calculations for Case 2 of 2". The Multi-case Cap applies to individual children and is to be found in the respective child's section for the respective adult (i.e. in this scenario immediately after Jim for C1 in the first case and likewise for C2 in the second case). You'd be looking for MCCAP. If the MCCAP is the same values as the Cost of This Child (CTC) then the multi-case cap applies, otherwise the multi-case allowance applies.
If you want further explanation about multi-case then here's a link to the CSA Guide 2.4.9: Assessments when a parent has multiple child support cases (Formulas 3 & 4)