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The way this works is that the support would be varied so that it reflects the actual income.If each parent has the child 50% of the time then a you did before, you take the higher income earners support amount (as if the child lived with the lower income earner full-time) and from that subtract that the lower income earner would pay and the higher income earner pays the difference.
The court will make an order for arrears to make this fair so long as there is no real delay in asking for the retroactive adjustment.
In terms of special expenses, generally they must be agreed upon by both parents and each contributes in proportion to their respective incomes.
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