It’s costing you up to $18,000 to have your adult kid live at home. What to do now to protect your finances

It’s costing you up to $18,000 to have your adult kid live at home. What to do now to protect your finances

Emma Caplan-Fisher

Thu, September 17, 2026 at 12:45 PM GMT+3 4 min read

The nest wasn't supposed to stay this full.

A record 25.2 million American adults under 35 now live with their parents, according to Realtor.com. That trend is collectively driven by rising housing costs, high inflation, student debt and a difficult job market, Bloomberg reports.

Must Read

• Jeff Bezos backs a platform that lets anyone invest in rental homes for as little as $100 — 6 ways to build wealth like a landlord without actually being one

• Dave Ramsey warns nearly 50% of Americans are making 1 big Social Security mistake. Here's what it is and 3 simple steps to fix it ASAP

• The tax breaks in Trump's 'big beautiful bill' expire after 2028. Here are 4 moves to make before the window closes

For parents absorbing the cost, the financial toll is substantial and frequently underestimated.

What it's actually costing

According to Savings.com's data, half of American parents with adult kids are providing regular financial support, averaging $1,474 per month, a 6% increase from the prior year. That's nearly $18,000 annually, often with no agreed end date. The breakdown is revealing: 83% help with groceries, 65% cover cell phone bills and 46% are paying for their adult child's vacations.

The retirement damage figure is particularly alarming. Among working parents who financially support adult children, the average monthly contribution to their own retirement savings is just $673, meaning they're putting 2.3 times more into their kids' lifestyle than into their own future. Nearly half of supporting parents say they've sacrificed their own financial security in the process.

AARP found that of 1,744 adults aged 45 and older, 75% are financially supporting at least one adult child, with average annual contributions of approximately $7,000, despite 53% of those children reportedly capable of meeting their own basic needs and then some.

Among those already retired or near retirement, that kind of outflow can permanently reshape the math of how long savings last.

Read More: Vanguard reveals what's coming for U.S. stocks — and it could be bad news for this group of investors

The problem: High retirement stakes

The compounding effect of redirecting money away from retirement at the wrong moment is severe. As finance expert Suze Orman has written on this point: "Every dollar you stop saving for retirement puts your future at risk."

And there's a lot at stake, according to IRS contribution limits: workers 50 and older can make up to $8,000 in catch-up contributions annually on top of the $24,500 standard limit.

Failing to take advantage of those years while simultaneously funding an adult child's expenses is one of the most costly financial errors a pre-retiree can make.

The problem, according to Savings.com's analysis, is described as a pattern placing "significant strain on many parents' financial security" — one that can worsen if economic conditions deteriorate further. And these arrangements can often lack clear terms, leaving adult children unaware of the financial pressure their presence creates.

What to do about it

Getting those terms on the table, and keeping retirement savings intact while doing so, is where professional guidance can help. Ameriprise Financial found that 96% of parents who work with a financial advisor are confident they'll achieve their top three financial goals, with 78% saying their advisor was helpful specifically in making financial decisions about their adult children.

Vague arrangements can later create resentment on both sides, so set a written agreement. Define what you cover, what they cover and, critically, what the timeline is. Build in a review, maybe in three months, six months or a year. And if they're living rent-free, treat the arrangement as a gift with conditions, not an open-ended subsidy.

On the tax side, the IRS annual gift tax exclusion sits at $19,000 per person. Providing free housing below that value generally doesn't trigger a reporting requirement, but formalizing a rent arrangement, even at a below-market rate, creates structure and can have tax benefits worth discussing with an accountant.

And most importantly: don't pause retirement contributions to fill the gap. Funding your child's present at the expense of your own future is a trade that makes two people financially fragile instead of one.

What To Read Next

• A single line on your car insurance policy could be inflating your premium by up to 30% — here's what to change

• Millionaires under 43 hold only 32% of their wealth in stocks. Here's where their money is actually going

• Savvy Americans are using 1 simple 'claw back' move to erase pain at the pump forever — act now before gas prices rocket higher (edited)

• Here are 4 simple ways to grow your cash in 2026 without touching the stock market

Join 250,000+ readers and get Moneywise's best stories and exclusive interviews first — clear insights curated and delivered weekly. Subscribe now.

This article originally appeared on Moneywise.com under the title: It's costing you up to $18,000 to have your adult kid live at home. What to do now to protect your finances

This article provides information only and should not be construed as advice. It is provided without warranty of any kind.