How to Update IRD and Work and Income After Divorce in New Zealand

Of everything on a post-separation to-do list, updating Inland Revenue is the one most likely to cost you money if you put it off — not because the process is complicated, but because entitlements calculated on a household that no longer exists don't correct themselves. They just keep paying out at the old rate until you tell IRD something has changed, and then you owe the difference back.

Why This One Can't Wait

If you receive Working for Families tax credits, they're calculated based on your family income and household situation — which, as far as IRD is concerned, hasn't changed until you tell them it has. Keep receiving payments calculated on a joint income that no longer reflects your actual circumstances, and you can end up significantly overpaid. That overpayment doesn't get quietly written off; IRD will claw it back, sometimes as a lump sum, sometimes through reduced future payments. The fix is entirely preventable: update your relationship status and separation date in myIR as soon as you separate, not once the divorce is finalised.

What to Update in myIR

Inland Revenue's online portal, myIR, is where most of this happens, and none of it requires a solicitor or a court order — it's information you can update yourself as soon as the relevant facts change.

Relationship status and separation date. If you receive Working for Families, update your status to "separated" and record the exact date the relationship ended. This is one more reason to have that date clearly documented from the start — you'll be citing it here, and potentially again later for KiwiSaver and relationship property purposes.

Income estimates. Update your estimated family income for the remainder of the tax year to reflect your actual, individual income going forward, rather than the combined household figure IRD may still be using.

Shared care arrangements. If children are involved, update the shared-care details in myIR so IRD can recalculate any child support or Working for Families entitlements based on the actual custody arrangement, rather than an assumption that you're still a two-parent household.

Joint investment income allocation. If you hold joint bank accounts or investment portfolios with your ex-partner, you'll need to manage and adjust how investment income from those accounts is allocated between you in myIR, so tax liability on interest or dividends is split correctly rather than defaulting to an outdated joint arrangement.

Name and title changes. Once you've legally changed your name or restored a previous surname, you can update it directly in myIR under "My Details," by uploading a digital copy of your change-of-name certificate, birth certificate, or passport.

Notifying Work and Income

If you receive any support through Work and Income — a benefit, an accommodation supplement, or other assistance calculated against household circumstances — the same logic applies. Entitlements based on your relationship status need updating as soon as that status changes, and delaying the notification risks the same kind of overpayment clawback that applies with Working for Families through IRD. Contact Work and Income directly to update your circumstances rather than assuming the change will be picked up automatically from another agency.

Why Agencies Don't Talk to Each Other

New Zealand doesn't have a single centralised system that updates your details across government agencies when your relationship status changes. Telling IRD doesn't tell Work and Income, and neither of them talks to the Family Court, Births, Deaths and Marriages, or NZTA. Each agency needs to be notified separately, with its own forms and its own timing — which is part of why so many of these updates get missed or delayed. Treat this as one item on a list of several agency notifications, not something that's "sorted" once you've dealt with any single one of them.

Do This Before You Notice a Problem

The safest approach is to update myIR and Work and Income within the first few weeks of separating, well before your circumstances create a noticeable gap between what you're being paid and what you're actually entitled to. Waiting until a bill or an overpayment notice arrives means you're solving a problem that already cost you money, rather than preventing it.

One Notification Among Several

IRD and Work and Income are two of several agencies that need to hear about your separation directly — banks, KiwiSaver providers, NZTA, and Births, Deaths and Marriages all require their own separate notifications too. The New Zealand After-Divorce Checklist tracks every agency notification in one place, with the forms and timing each one requires, so nothing slips through simply because no single agency was responsible for reminding you.

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