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A bug in the CS formula?

I was playing around with the CS calculator today and for some reason I was looking closely at the figures and I think that in some cases percentages of the cost of children get lost (i.e. cost percentages don't add up to 100%).

The scenario I found this in is likely only for the rarer non-parent carer cases.

Here's the scenario 1 child with parents having 69 and 128 nights care with a non-parent carer having the remaining 168 nights care.

69 nights = 18% care which equates to a cost percentage of 24%
128 nights = 35% care which equates to a cost percentage of 25%
168 nights = 46% care which equates to a cost percentage of 47%

69+128+168 = 365 (OK)
18+35+46=99% (not 100% due to rounding)
24+25+47=96%. (OUCH)

That's 4% of the cost of the child lost!

tongue in cheek

It is probably a discount applied because of all the traveling the child would have to do.

For me - Shared Parenting is a Reality - Maybe it can be for you too!
Is that a good reason to use the site calculators here Mike T?

Executive Secretary - Shared Parenting Council of Australia
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Secretray_SPCA, yes and no.

The bug is actually within the formula itself. That is that the percentages don't add up when a there are more than 2 people involved, I did another and the discrepancy was that 6% of the cost of children wasn't catered for. I think it's limited to a non-parent carer scenario (i.e. I believe it's due to a 3rd person having a share of the care) so any calculation, that uses the formula would result in a discrepancy when the conditions are correct. So that's the no, but the CSA's estimator doesn't cater for non-parent carer scenarios, and therefore this highlights one of the reasons to use the advanced calculator available here, that is that it can do all formula based calculations, that's the yes that is highlighted by this bug.

Other reasons are that it's based upon a single page that collects the input and displays the results making it far easier to use, other than the fact that due to it catering for all formula based calculations the input itself, to cater for this, is more complicated to understand. The Advanced Calculator also provides a far greater level of help and a more extensive report, although this can be more difficult to understand. It can also provide intermediate values. The Estimator has issues with some of the input fields being clumsy and not providing explanatory information, just ! to indicate something is wrong. The Estimator also allows the input of values outside of the range that it can handle, any amount above $21,474,834 results in a $0 assessment.

I wonder if anything was done in regard to the SPCA Review of the Estimator that was given to the CSA (last time I used the Estimator I noticed some of the same issues). Also I don't believe the CSA have commented on the review of the Advanced Calculator. The last I heard was that David P sent an email asking a person to undertake the review.


On the topic of the Calculator, we should start chasing the new values for 2010 soon (perhaps see if they are available now).

The values we need are :-
The annualised MTAWE that will be used for 2010.
The annual Parenting Payment Single to be used for 2010.
The Fixed assessment annual rate to be used for 2010.
The Child Support Minimum Payment Annual Rate to be used for 2010.
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