When an adult child moves back in: how to help without losing your retirement

This is the third article in an accidental set. The first was about what caring for an ageing parent costs your own retirement. The second was about minding the grandchildren. This one is the last leg of the triangle — the adult child who moves back home — and it's the one people are least willing to talk about at a barbecue.

It's also very common, and getting more so. And before anything else: it's usually the right thing to do. Most parents in this situation would do it again, and would do it gladly. What follows isn't an argument against it. It's an argument for doing it with the terms agreed, because the thing that damages retirements here isn't generosity — it's drift. This article is general information only, not personal advice.

What is the distinction to make first?

We have a separate article about a retiree moving into an adult child's home — the granny flat interest, co-ownership, protecting the money you put in. That's the opposite direction, and if that's your situation, go there. This one is about your child moving back into your house.

Is it a character failing — theirs or yours?

Let's dispose of the "kids these days" framing straight away, because it's both unkind and wrong. The trend is real and it is measurable. Between 2007–08 and 2017–18, the proportion of Australians aged 15 to 24 living with their parents rose from 69 per cent to 75 per cent, and the increase was sharpest among the older group: 20 to 24 year olds went from 48 per cent to 58 per cent (Australian Institute of Health and Welfare, https://www.aihw.gov.au/reports/children-youth/australias-youth/contents/demographics). It has not slowed since. The Australian Institute of Family Studies, analysing the 2021 Census, found that the 2016 to 2021 period showed the sharpest increase in recent decades, and that among 20 to 24 year olds in capital cities, 53 per cent of young men and 47 per cent of young women were living with their parents — well above the regional figures of 45 and 34 per cent (Australian Institute of Family Studies, https://aifs.gov.au/media/more-young-adults-living-parents).

Read those numbers again, because they settle the argument. When a majority of young men in Australian cities are living at home, you are not looking at a generation of individual character failures. You are looking at rents and house prices that bear no relationship to the ones their parents faced, work that is less secure, relationships that end, and health that goes wrong. That's structural. It isn't softness, and it isn't a verdict on how you raised them.

Equally, it isn't a failure on your part to find it hard. Both things are allowed to be true at once.

What does it actually cost?

The running costs come first, and they arrive every single week. Three people in a house cost meaningfully more than two — food, power, water, internet, hot water, the car. On a fixed income, that gap is not nothing.

The bigger cost is the plans that quietly stop, and it's the one nobody notices happening. The downsize that can't proceed because someone's in the second bedroom. The three months in Europe that can't be booked because someone needs to be here. The sea change, the renovation, the sale — all deferred, none of them ever formally cancelled. Just not happening, year after year.

Then there's the direct support beyond the housing: the car that needs fixing, the debts, the legal costs after a separation, the grandchildren's things. It adds up quietly and it rarely gets counted.

And then the part nobody says out loud. The house isn't quite yours anymore. The quiet you'd earned is gone. You and your child slip back into a parent-child dynamic that neither of you actually wants, and the relationship you'd finally got to as two adults gets harder to hold onto. That's a real cost. It's allowed to be named.

What is the Centrelink question, answered?

This is where most people guess, and where the guess is usually pessimistic. So here is the actual rule, and it is good news: board and lodging paid to you by an immediate family member is not income for social security purposes. Immediate family means your parents, your children and your siblings (Services Australia, https://www.servicesaustralia.gov.au/income?context=22526). The Services Australia operational guidance puts it plainly — where the boarder or lodger is a near relative, meaning a parent, child or sibling, the income received is not treated as income for social security purposes, and that holds even if the relative occupies a self-contained living area within the home (Services Australia, https://operational.servicesaustralia.gov.au/public/Pages/income-assests-and-rates-of-payment/108-05040010-01.html; Social Security Guide, https://guides.dss.gov.au/social-security-guide/4/3/8/40).

So if your son pays you $200 a week for his room and his dinners, that $200 does not count against your Age Pension income test. Not part of it. None of it. Which means the single most common reason people give for not charging their own child board — "it'll just come off my pension" — is simply wrong.

It's worth knowing what the rule would have been, because it tells you why the exemption matters. If the person in the spare room were a stranger rather than your child, only part of what they paid would count, and the share would depend on what you provided: 70 per cent of the gross amount for lodging only with no meals, 50 per cent for bed and breakfast, and 20 per cent where you provide any meals beyond breakfast, with mortgage interest or rent on your own home deducted from the assessed figure (Services Australia, https://operational.servicesaustralia.gov.au/public/Pages/income-assests-and-rates-of-payment/108-05040010-01.html). Your child is exempt from all of that. Our article on boarders and lodgers goes through the mechanics for the non-relative case.

Money you give them, as opposed to housing them, is a different matter and does have limits. The gifting free areas are $10,000 in a single financial year and $30,000 over five financial years (fixed, unindexed amounts, unchanged for FY2026-27), and the five-year figure can't include more than $10,000 from any one year. Gift more than that and the excess counts in your assets test and is deemed under your income test for five years from the date of the gift (Services Australia, https://www.servicesaustralia.gov.au/how-much-you-can-gift?context=22526; https://www.servicesaustralia.gov.au/gifting). Our article on gifting explains the mechanics. Neither of these is a reason not to help. They're reasons to know where you stand rather than discover it later.

How do you do it well?

Agree the terms before they move in, not after: what board, what share of the cooking and the cleaning, what the expectations are, and — the one everybody skips — roughly how long. This conversation is ten times easier before the van arrives.

Then set a review date, not a deadline. This is the single most useful idea in the article. "Let's sit down in six months and see where we're at" is a conversation. "You're out by Christmas" is a threat. A review makes changing the arrangement a normal event instead of a rupture, which is exactly what stops the drift.

Charge some board if you possibly can, even a token amount. Not for the money, and now — given the exemption above — not for any Centrelink reason either. Charge it because paying something makes it an arrangement between two adults rather than a regression to being fifteen, and because it's better for their dignity as well as your budget.

Say what you're giving up. If the downsize matters to you, say so — early, kindly, plainly. Nobody can weigh a cost you've kept to yourself, and your children genuinely cannot see the trip you've stopped mentioning.

Don't fund their life out of your retirement. You can't re-earn it, and the Age Pension won't backfill it. ASIC's MoneySmart is blunt about the line here, warning retirees under the heading of the "Bank of Mum and Dad" to ensure they are not being pressured to gift or loan money, asked to become guarantor for a loan they are not comfortable with, or made to feel guilty for not helping (ASIC MoneySmart, https://moneysmart.gov.au/manage-your-money-in-retirement/get-help-in-retirement/protect-your-money-in-retirement). The overwhelming majority of families reading this are nowhere near that territory. But if any of those three describe your house, that same page points to the national elder abuse phone line on 1800 ELDERHelp — 1800 353 374 — which redirects you to the service in your own state or territory. It is an information and advice line rather than a crisis service, its hours vary by state, and it is not a 24-hour line; in an emergency the number is 000 (Department of Health, Disability and Ageing, https://www.health.gov.au/contacts/elder-abuse-phone-line). The genuinely kindest long-term outcome for your children is that you stay solvent and independent rather than becoming their next problem.

And document any real loan. A loan is a loan — our article on family loans explains why writing it down protects everyone, including them.

What is the hard part — that it was meant to be temporary?

Here's the pattern. Six months becomes a year. A year becomes three. Nobody ever decided that — it just kept not ending. And by then, raising it feels like an eviction notice, so nobody raises it, and the resentment quietly sets like concrete.

That's the same drift our articles on caring for a parent and minding the grandchildren describe, and it has the same fix: the review date, agreed at the start, when it costs nothing to agree. If you're already three years in and stuck, it's still a conversation worth having — kindly, directly, and if it's become genuinely fraught, possibly with the help our article on family mediation describes.

What if they're home because something went badly wrong?

One important caveat. There's a big difference between a child living at home to save a deposit and a child who's come home after a marriage has collapsed, or a mental-health crisis, or a serious illness. In the second case, the terms matter far less and the support matters far more — at least for a while.

Know which situation you're actually in. Treating a crisis like a tenancy is cruel. Treating a tenancy like a crisis is how three years happen. Both mistakes are easy, and they're opposite.

What do the worked examples show?

These two show the same arrangement working and not working. They are illustrative only, and not personal advice.

Consider Barbara, 69, a single Age Pensioner who owns her home outright. Her son David, 34, moved back in after his relationship ended, saying it would be for a few months. That was two years ago. Barbara has never asked him for board, partly because it felt mean and partly because she assumed anything he paid would be clawed back off her pension. Meanwhile she has quietly shelved the downsize to a unit near her sister, and has not mentioned it to David at all. On these facts, Barbara's belief about the pension is simply mistaken: board paid by her own son is not income for social security purposes (Services Australia, https://www.servicesaustralia.gov.au/income?context=22526), so charging him $150 a week would cost her nothing in pension and would leave her materially better off. On these facts it is generally rational for someone in Barbara's position to do two things at once — start charging board, and say the word "downsize" out loud — because the problem here is not David and it is not the money. It's that two years of decisions have been made on a false assumption nobody ever checked, and a plan nobody has been told about.

Now consider Ray and Judith, both 71, whose daughter Anna moved home at 39 after being made redundant. Before she arrived they agreed the shape of it: $180 a week once she was working again, she cooks twice a week, and they sit down each June to see where things are. When Anna's new job came through eight months later, that June conversation happened as a normal event rather than an ambush, and they agreed she'd stay another year to rebuild her savings. On these facts nothing needs fixing, and the reason it works isn't that Ray and Judith love their daughter more than Barbara loves David. It's that the number, the expectations and the review date were all said out loud before the van arrived — and that they checked the Centrelink position rather than assuming it. The difference between the two households is not affection. It's whether anyone ever agreed anything.

What is the triangle?

Some people are doing all three at once: an ageing parent needing care, grandchildren two days a week, and an adult child in the spare room — all while trying to have the retirement they spent forty years paying for. If that's you, please take it seriously. It's a genuine risk to the plan and to you. Name it, size it, share it, and use the services and payments that exist. Our other two articles cover the supports available for each.

What should you do in short?

Say yes if you want to — most people do, and most are glad they did. Just do it as an agreement rather than an accident: settle the terms before they arrive, take a bit of board (it won't touch your pension, whatever you've been told), name the plans you're deferring, and put a review date in the calendar so that six months can't quietly become three years. Helping your children is one of the good things in life. Handing them your retirement without ever deciding to is not the same thing.

Sources

• Services Australia — Income from boarders and lodgers (108-05040010)
• Services Australia — Income (Age Pension)
• Social Security Guide — 4.3.8.40 Income from boarders or lodgers
• Services Australia — How much you can gift (Age Pension)
• Services Australia — Gifting
• AIHW — Australia's youth: Demographics
• AIFS — More young adults living with parents than ever before
• ASIC MoneySmart — Protect your money in retirement
• Department of Health, Disability and Ageing — Elder abuse phone line