The Finance Minister says the Family Boost scheme isn't exactly as promised pre-election.

From July, parents and caregivers can claim back up to 25 percent of childcare costs, to a maximum $75 dollars per week.

Nicola Willis says they'd hoped to reimburse parents every fortnight- but the IRD warned that their systems weren't sophisticated enough to deliver on that.

"We're not prepared to delay, we want this released in people's bank accounts this year. So instead, we're going for an approach where parents send their invoices in every three months and they get a lump sum payment."

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