Don't Let Supporting Adult Children Derail Your Retirement

Supporting your children is natural. Doing it at the expense of your own retirement is a risk most parents don't see coming.

Most parents will do anything for their children. If an adult son or daughter needs help with rent, a car repair, a deposit, or simply a place to stay, the instinct is to say yes without hesitation.

Here is what goes wrong most often: parents in their fifties and sixties redirect savings, absorb expenses, or delay investment contributions to support adult children, one small decision at a time. Because you can borrow to buy a house, a car, or an education but you cannot borrow for retirement, the compounding cost of diverted capital is far larger than the dollar amount suggests. This article will help you work out whether the support you are providing (or considering) is sustainable, when helping adult children financially makes good sense, and how to set boundaries without damaging the relationship.

More NZ Families Are Supporting Adult Children Than Ever

This is not a niche issue. The 2023 Census found 34.5 percent of New Zealand families with children had an adult child living with them, up 27.3 percent since 2013. Stats NZ principal analyst Rosemary Goodyear attributed the shift, at least in part, to cost-of-living pressures.

The drivers are real. Housing costs, while improving from their peak, remain elevated. The national house price-to-income ratio still sits above its long-run average, and the median national house price remains well above what most young earners can comfortably service on a single income. Add rising rents, insurance premiums, and everyday expenses, and it is no surprise more young adults are staying home longer or returning after a period of independence.

The pattern extends well beyond New Zealand. In Australia, more than half of young adults still live with their parents. In the United States, Pew Research found 28 percent of 18 to 34 year olds received help from parents with everyday costs, a quarter received help with phone bills and subscriptions, and 17 percent received help with rent or mortgage payments.

And it goes further than sharing a roof. Parents routinely help with car purchases, weddings, overseas travel, insurance, medical and dental bills, babysitting, and letting adult children use holiday homes. The cumulative cost is far larger than most parents realise.

How Helping Adult Children Financially Compounds Over Time

The most significant cost of supporting adult children is not the money itself. It is the investment returns you forgo by not having it.

Consider a couple in their late fifties who give their adult children $15,000 a year in combined support, whether as direct transfers, subsidised rent, or expenses absorbed. Over five years, the total outflow is $75,000. At a net return of 5 percent per annum, those same dollars left invested would have grown to roughly $87,000 by the time the couple reached 65. Over a further 20 years of retirement, the compounding effect widens the gap considerably. (These are illustrative figures; actual outcomes depend on returns, inflation, tax, and timing. The direction of the effect holds under almost any reasonable assumption.)

Now multiply this across two or three children, or extend the support period, and the numbers start to reshape a retirement plan.

In our advisory work, the gap between what parents think is happening and what we actually see in their plans is striking. Most parents believe they are providing occasional, modest help. When we map the cash flows, the picture is usually different: ongoing support has become a structural line item in the budget, often exceeding what the couple contributes to their own investments in a given year. We also see parents quietly pausing or reducing non-KiwiSaver investment top-ups when cash-flow pressure builds, rarely intending it to be permanent, but the compounding cost of even a few missed years is real. None of these decisions were made consciously. They accumulated.

The Emotional Dimension

Money is only half the picture. For most parents, the reluctance to set limits has nothing to do with the numbers and everything to do with guilt, obligation, and the fear of damaging the relationship.

Psychology professor Lawrence Steinberg told Radio New Zealand the transition to adulthood now happens much later than in previous generations, and the timeline for milestones like buying a home or establishing a career has shifted by roughly five years.

Parents who accept this will find it easier to avoid frustration. But acceptance should not mean indefinite financial commitment. As Steinberg noted, too much involvement can interfere with an adult child's ability to develop competence and self-reliance, sometimes prompting them to deliberately reject parental help out of resentment.

There is also an important distinction between a safety net and a hammock. A parent who covers a short-term gap while a child gets back on their feet is doing something constructive. A parent who absorbs ongoing living costs with no agreed end point may, with the best of intentions, be reinforcing dependency. Psychology Today has reported this dynamic can be accompanied by anxiety, depression, and low self-esteem in the adult child, and stress and resentment in the parent.

When Helping Adult Children Is a Rational Financial Decision

Not all financial support is equal, and this article is not arguing against helping your children. Under the right conditions, support is unlikely to impair your retirement at all:

You have a funded surplus. Your retirement projections show you can comfortably meet your own spending needs, including health and aged care contingencies, even after the proposed support. If you are not sure, a financial plan will clarify this quickly.

The support is time-bound and purposeful. A defined contribution to a first-home deposit, for example, can shift a child's entire financial trajectory. The Bank of Mum and Dad is now estimated to be New Zealand's fifth-largest source of owner-occupier lending. One-off capital transfers with a clear purpose are fundamentally different from ongoing income substitution.

You have modelled the impact. The support has been stress-tested against your retirement plan, including the compounding cost of the capital you are giving away, not just the face value.

When these conditions are met, helping your children is not a risk. It can be one of the most productive uses of family wealth. In fact, we have seen cases where parents who refused to help with a deposit later ended up providing far larger sums: covering rent for years, bailing out credit card debt, or funding a second attempt at homeownership at higher prices. A well-timed, well-structured transfer can prevent a more costly pattern from developing.

The risk lies where most families actually end up: ongoing, unquantified support with no agreed timeframe. As a guide, if your combined annual support across all children exceeds $10,000 to $15,000, or you are considering a six-figure transfer such as a house deposit, it is worth getting professional advice to model the impact on your own position.

If you are not sure whether the support you are providing is sustainable, a good starting point is to stress-test the impact against your retirement projections. Get in touch for a complimentary initial conversation.

NZ-Specific Risks Worth Knowing

Once money moves from informal help to significant capital, a second layer of consequences emerges. These are risks most families only discover too late.

Relationship property. Under the Property (Relationships) Act 1976, a gifted sum used to purchase a shared home can become relationship property, subject to equal division if the child's relationship ends after three years or more. A contracting-out agreement (sometimes informally called a "prenup") is the most reliable way to ring-fence parental contributions. Without one, your gift may end up benefiting someone you did not intend it for.

Residential care subsidy. If a parent enters residential care and Work and Income reviews their financial position, large gifts made in the preceding five years may be "clawed back" into the asset assessment. This matters more than most people expect, particularly for parents approaching or past their late sixties.

Loans recharacterised as gifts. Repeated "loans" to adult children with no formal documentation and no repayment history can be recharacterised as gifts by MSD or challenged under the Property (Relationships) Act. If you intend a transfer to be a loan, put it in writing with clear terms, and ensure at least some repayments are being made.

These are not reasons to avoid helping. They are reasons to structure help properly, with legal and financial advice, before the money changes hands.

It Depends on Your Situation

"When you are on a plane, you are always told to put your own oxygen mask on first," says Joseph Darby, CEO of Become Wealth. "For many New Zealand households, the same principle applies. Helping adult children before securing your own retirement is a genuine financial risk, and an irreversible one.

"But for wealthier families who can comfortably afford to help, the risk is different. It is about what the support does to the person receiving it. An adult child who has never had to earn a home deposit, manage a tight budget, or recover from a setback on their own may develop a weaker work ethic and a fragile relationship with money. The research on inherited wealth is clear on this point. Sometimes the most helpful thing a parent can do is step back."

How to Set Boundaries

Be transparent about your own position. Your children do not need to know every detail of your finances, but they should understand you have finite resources and your own retirement to fund. Most adult children respond well to honesty. The conversation goes worse the longer it is delayed.

Put a timeframe on it. If your adult child is living with you or receiving regular financial support, agree on a timeframe: six months, twelve months, whatever is reasonable. A deadline creates a shared goal. For families navigating the practicalities of an adult child moving out, the transition works far better with a date on the calendar than without one.

Require contribution. Board, rent, chores, or a share of household expenses maintain the adult child's sense of responsibility and keep a realistic picture of what independent life costs.

Support capability, not consumption. Helping your child build a budget, explore career options, or understand investing is worth far more than writing cheques. Teaching children about money earlier in life can reduce the chance of dependency developing in the first place, and for adult children the same principle applies: financial literacy compounds just like money does.

Get advice if the numbers are significant. If you are providing sustained annual support or considering a large one-off transfer, it is worth stress-testing the impact on your own retirement plan, particularly once the relationship property, care subsidy, and compounding implications are factored in.

Don't Let Supporting Adult Children Derail Your Retirement

Supporting adult children is one of the most natural things a parent can do. In a world of high housing costs, student debt, and uncertain job markets, it is also increasingly common.

But generosity without structure can quietly erode the retirement plan you have spent a working lifetime building. For most households, the rule is simple: secure your own position first. For wealthier families, the consideration shifts to whether your generosity is building independence or undermining it.

The team at Become Wealth helps families navigate these conversations, from modelling the retirement impact of a proposed gift to structuring support so both generations come out ahead. If you would like to sense-check how your current arrangements fit alongside your retirement plan and investment goals, get in touch for a complimentary initial conversation.