Most families settle on an amount that is below market rent and tied to what the adult child actually earns. A common starting point is 10% to 30% of their take-home pay, or an agreed share of the bills (groceries, utilities, phone) instead of a fixed rent. What's "right" depends on three things: what the household really costs, what your kid earns, and why they're home in the first place.
That last part matters. Paying off debt, saving for a deposit, or getting back on their feet after a job loss all call for different arrangements. So does a household where everyone just needs the money to keep the lights on.
You're not the only family dealing with this
In the US, living with parents as a young adult is normal. The US Census Bureau reported that in 2025, 58% of adults ages 18 to 24 lived in their parents' home, as did 16% of adults ages 25 to 34. (For 18- to 24-year-olds, that count includes college students living in dorms.)
Most of them already chip in. In a 2024 Pew Research Center survey of US young adults living with their parents:
- 65% said they help pay for household expenses like groceries or utilities
- 46% said they put money toward the rent or mortgage
- 72% said they did at least one of these
So asking for a contribution isn't harsh. Most families already do it.
Step 1: Work out what an extra adult really costs
Before you choose a number, check the facts. Write down what changed once your adult child moved back in:
- Groceries: Adults eat a lot, and the grocery bill usually shows it.
- Utilities: Longer showers, more laundry, devices plugged in day and night.
- Phone and streaming plans: Are they still on yours?
- Car costs: Insurance, fuel, and wear if they borrow the family car.
- Housing costs: Some families divide part of the rent or mortgage among everyone living there. Others leave it out completely.
That gives you a floor: the amount that keeps your budget from going backward. You can charge less on purpose, but at least you'll know you're doing it.
Step 2: Match the amount to their income
Something that's fair at $4,000 a month is crushing at $1,200. Here are a few common ways to set it, all simple rules of thumb rather than official standards:
| Approach | How it works | Best for |
|---|---|---|
| Percentage of pay | 10–30% of take-home income | Kids with steady but modest income |
| Share of bills | They cover set costs (e.g., groceries + internet) | Families who want clear, practical splits |
| Flat token amount | A small fixed sum, like $100–$300/month | Students, new grads, early job-hunters |
| Market-lite rent | Below what a local room would cost, but close | Well-paid adults with no urgent savings goal |
For context, the US Department of Housing and Urban Development considers households that spend more than 30% of income on housing to be "cost burdened". Keeping your kid's share well under that leaves them room to save, and saving is usually why they're home.
Hypothetical example: Your 23-year-old takes home $2,400 a month. At 15%, that's $360. If groceries and utilities have gone up by about $300 a month since they moved in, $360 covers the real cost with a little left over, and they can still save seriously.
Step 3: Decide what the money is for
Agree on the purpose of the money before the first payment. Common setups:
- It pays for the household. The money goes into the family budget, plain and simple.
- It's saved for them. Some parents quietly put the "rent" aside and hand it back when the child moves out, as a deposit or moving fund. If you do this, decide whether to tell them. Some families think the surprise is part of the lesson. Others think being open builds trust.
- A split. Part covers costs, part goes into savings for them.
None of these is wrong. Just choose one so nobody feels misled later.
Step 4: Count contributions that aren't cash
Money isn't the only thing an adult child can contribute. If your kid earns little, it can be fair to swap some rent for:
- Cooking a set number of dinners each week
- Driving younger siblings around
- Yard work, cleaning, or errands
- Helping a grandparent who lives with you
Write down what's expected. "Help out more" leads to arguments. "Groceries and dinner on Tuesdays and Thursdays" doesn't.
Step 5: Put it in writing (yes, really)
A short, informal agreement saves a lot of awkward talks. Include:
- The amount and due date (payday-aligned works best)
- What it covers, such as food, utilities, laundry, or Wi-Fi
- House rules: guests, quiet hours, chores, shared car use
- A review date, every 3 or 6 months, or whenever their income changes
- A target move-out timeline, if there is one
It's not about distrust. Adults get along better when everyone knows the deal.
A quick tax note for US families
If you're in the US and your adult child pays you rent, check how the IRS might treat that money. IRS Publication 527 covers residential rental income, including renting to family members and renting at less than a fair rental price. Below-market rent to a relative generally limits which expenses you can deduct. Rules vary by situation and are different in other countries, so ask a tax professional if you're collecting regular rent.
When to charge less (or nothing)
Lower or pause the contribution if your child is:
- In school full-time or in a training program
- Unemployed and actively looking for work
- Paying down high-interest debt on a clear plan
- Dealing with a health or mental health crisis
- Saving hard for a specific, near-term move-out goal
Charging little or nothing still works best with some structure. A short timeline and a check-in date stop "temporary" from turning into "indefinite."
Your own finances count too. Pew found that among US parents who helped their adult kids financially in the past year, 36% said it hurt their own finances at least somewhat. Supporting your kid shouldn't come at the cost of your retirement savings or emergency fund.
When to charge more
Raising the amount is reasonable when:
- They earn a good, stable income and aren't saving much
- Their spending on extras has grown while their contribution hasn't
- Your own budget is under strain
- They've been home longer than planned with no move-out plan
Raising it doesn't have to be a fight. A scheduled review makes it a normal step instead of a punishment.
The bottom line
A fair amount covers the real cost of having another adult in the house, matches what your kid earns, and leaves them a clear path to moving out. Most families end up between a modest share of the bills and about 30% of take-home pay. The exact number matters less than agreeing on it in advance, writing it down, and checking it regularly.
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