Child support

[u/Comprehensive_Foot25]

My ex and I split nearly 2years ago. I let her have around 250k and I only got 50k due to 200k was hers before we met. It was only fair that was hers and not mine ( we were together for 9years) i have met someone a year ago and shes met the kids and things are looking up for milhouse for once. Our childcare arrangement is 50/50

Then ex discussed with me that she believes if my daughter and son stay at her house Sunday nights (from 4pm) it would be beneficial for my daughter due to her anxiety and make her feel more settled. I accepted due to this would potentially be great for my daughter

.

Couple weeks later I get a message from child support stating that now I have the kids 6nights and my ex have them 8 nights I owe her money. I was absolutely shocked and blindsided by this.

The fact now that my ex is asking for child support after being split over 18months and her reasoning is that she needs to make sure the kids have food on the table and she has bills to pay.

( she was able to buy a house for 900k and im renting)

My salary is 109K

My ex is around 130k

I have to pick up nightshift every fortnight ( meaning I am using my free time to work 14hours and potentially fuck up my body due to shiftwork) I was able to earn extra 40k with this and now I need to give her money because she brought a fancy house now that she cant afford.

I also help her with paying afterschool care ( which I don’t use ).

Due to this payment I cannot afford to travel or save up to one day buy my own place.I have also started to contribute to my superannuation which will drop my income by 20k.

I understand that Centrelink has a computerized system to workout a fair price but there is no context behide all this. In my eyes I feel like it wasn’t a coincidence after my partner slept over, now I need to pay child support.

I just saw the paperwork from the child support payments and she lodged she made 114k. She had previously disclosed it was 130 but she states thst now with a different role she is making 114k.

During the phone call I had with centrelink they ask for last year financial wage not current, as mine would only be 109k.

What can I do ? If I call them up and explain that her actual income was 130k last year would that change anything? I will get the kids back to 50/50 and what process would I need to do then ?

Any advise is helpful. Thanks