it is the six months immediately AFTER baby is born - so if you're not sure what that income is going to be, you're better off waiting til after the six months has passed, confirming the income, and THEN claiming the bonus. if you claim it at birth and then go over that 75k, you'll have to pay it back
it's based on the time AFTER the baby is born as many mum's work up until baby is born and their combined income in that previous six months would be over the income, but having unpaid or half pay mat leave (or short period of time) would put them under the threshold and they'd therefore qualify for the payment
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