A $4,000 Truck Turned Into $3 Million: A Kid Business Lesson

Kirk McKinney was riding his bike around Norwood, Massachusetts about six years ago when he found a dump. Not treasure exactly. Mostly junk. But there were speakers and electronics in there, and when his mom told him to get the speakers out of the house, he decided to sell them instead of tossing them.

That's the origin. A kid, a bike, speakers his mom wanted gone.

He and his brother Jacob started Junk Teens in 2021, still in high school. They bought a $4,000 pickup. They hauled other people's junk away, kept what was worth reselling, and dumped the rest.

In 2025 the company brought in $3.04 million in revenue and more than $686,000 in net profit. They run eight trucks now, employ 25 people full time, and serve the Boston area plus Cape Cod and Rhode Island. This year they're on track for more than $5 million.

Kirk is 22. Jacob is 20.

If your kid has ever said "I want to start a business," this story is worth talking through.

Ask a ten-year-old what business they want to start and you'll hear app, YouTube channel, or something involving a game they like.

Ask what business makes money in their actual neighborhood and the answer changes. Lawn care. Dog walking. Cleaning. Hauling stuff away.

Junk removal is not exciting. Nobody makes a movie about it. That's part of why it worked, because boring businesses have three things going for them that exciting ones don't.

People already know they need it. Nobody has to be convinced that a garage full of old furniture is a problem. Compare that to a new app, where step one is explaining why anyone should care.

Payment happens the same day. The truck leaves, the money is in the account. No waiting on ad revenue or sponsors.

And competition is mostly other people with trucks, not a venture-backed company in San Francisco with fifty engineers.

Here's a dinner conversation worth having: what do people around here pay to make go away? That question finds more real businesses than "what's your big idea?" ever has.

This is the part of the story everyone skips, and it's the most important one.

The brothers made money with their $4,000 pickup. Then instead of spending that money on things teenagers buy, they put it into an $80,000 dump truck. That purchase is described as a turning point for the business, because a dump truck hauls in one trip what a pickup hauls in five.

Think about what that felt like at the time. They were teenagers with real cash for the first time, and they handed nearly all of it to a truck dealer.

This is the difference between a kid with a side hustle and a kid building a business. The side hustle turns profit into stuff. The business turns profit into capacity.

You can practice this at any scale. A kid selling bracelets who spends the first $60 on better clasps and a display board instead of a video game is running the same play. So is the one who buys a second mower.

Try a rule: half the profit is theirs to spend, half goes back into the business. Then let them watch what the reinvested half does over three months. The lesson lands harder when they see it.

Kids hear "$3 million business" and picture $3 million in somebody's pocket. Worth correcting, because the real numbers teach more than the headline.

Junk Teens did $3.04 million in revenue in 2025 and more than $686,000 in net profit. That's roughly 23 cents of profit per dollar coming in, a healthy margin for a service business.

Where did the other 77 cents go? Twenty-five employees. Eight trucks. Fuel. Insurance. Dump fees, which are real and not small. Repairs. Advertising. Phones.

Great whiteboard exercise: write $100 at the top, then have your kid subtract what it costs to do the job. Gas to drive there. The helper you paid. The fee at the dump. What's left is the number that matters.

Most kids have never separated revenue from profit, and plenty of adults haven't either. A lemonade stand that takes in $40 and spent $35 on lemons, cups, and a folding table had a $5 day, not a $40 day.

Getting this straight early changes how a kid thinks about every business they hear about.

The brothers have said they took advice from YouTube. That's how a lot of young founders learn now, and it's worth being clear-eyed about.

The good part is real. Free instruction on pricing a job, handling a complaint, or reading a truck listing is available to any kid with a phone. That access didn't exist for their parents.

The less good part is that YouTube's business advice is selected for watch time, not accuracy. The channels that grow promise fast results. A video titled "how I built a boring service business over four years with slim margins" does not get recommended.

So teach the filter. When a kid shows you a business video, ask three questions. Is this person actually running the business they're describing, or do they make money teaching people to run it? Are they showing revenue or profit? And how long did it take, really?

Kids who develop those questions stop getting pulled in by the dropshipping and crypto-flipping videos that empty out savings accounts. The same filter works later on college advice, health claims, and job offers.

You do not need a truck. Pick a service, pick a street, do four jobs.

Start with something you can do using what's already in the garage. Hauling cardboard to recycling after people move. Cleaning out a car. Yard cleanup after a storm. Taking holiday decorations down in January, which is a real business almost nobody wants to do.

Set one price before knocking on any doors. Not "whatever you think is fair," which is how kids end up working two hours for eight dollars. Decide the number, say it out loud, practice saying it without flinching.

Write down for each job: what you charged, what you spent, how long it took. After the fourth, calculate the hourly rate. That one sheet of paper teaches more than any book.

If they want to keep going, structure helps. A notebook works fine. So does a spreadsheet, or a tool like Foundra that walks first-time founders through pricing, costs, and customers step by step. Whatever keeps the thinking visible instead of stuck in their head.

A few things are on you, not them.

Safety first. Lifting heavy items, power tools, and unfamiliar houses all carry real risk. Set rules about what they will not lift and where they will not go alone. Go with them for the first few jobs.

Insurance and permits. Check what your state and town require for a young person doing paid work on other people's property. Many places are fine with informal neighborhood work and less fine once trucks and employees appear.

Taxes. Past a certain point, self-employment tax rules apply, even for teenagers. If your kid clears a few thousand dollars, talk to whoever does your taxes. There's an upside too: earned income makes a kid eligible for a Roth IRA, and money going in at 15 has a long time to grow.

School. Set the boundary early and in writing. Twelve hours a week during the school year, more in summer, whatever fits your family. Businesses expand to fill available time, and a kid will not be the one to stop it.

None of this is meant to slow them down. It keeps a good thing from turning into a problem.

• Kirk and Jacob McKinney started Junk Teens in 2021 in high school with a $4,000 pickup. In 2025 they did $3.04 million in revenue and over $686,000 in net profit, with eight trucks and 25 employees.
• Boring service businesses work because the need is obvious, payment is immediate, and competition is local.
• The turning point was reinvesting profit into an $80,000 dump truck. Practice this with a half-spend, half-reinvest rule.
• Revenue is not profit. Have your kid subtract real costs from a real job.
• Teach a filter for online business advice: running the business or selling the course, revenue or profit, and how long did it take?
• Start with four jobs, one fixed price, and a written record.
• Parents own safety, permits, taxes, and school hours.

How old does a kid need to be to start something like this?

Neighborhood service work can start around 10 or 11 with an adult nearby. Anything involving driving, power equipment, or employees waits. The McKinneys were in high school when they began, and they started with hauling, not trucks and staff.

What if my kid wants to do something online instead?

Fine, but have them do one in-person job first. Selling to a neighbor who can see their face teaches pricing and follow-through faster than anything on a screen. They can go back online with better instincts.

Isn't $4,000 for a truck a lot to risk?

It is, and you don't need it. The brothers had years of reselling behind them first. Start with a service that needs nothing, and let tools get bought out of money the business earned.

How do I keep this from taking over schoolwork?

Set the weekly hour cap before the first job, write it down, review it monthly. The constraint is easier to hold when it existed before the money did.

What if it fails and they lose their savings?

Then they learned what a bad month looks like for about the price of a game console, at an age where nothing else depends on it. Keep starting stakes low enough that failing is survivable, and treat the post-mortem as the lesson.

1. CNBC: Gen Z brothers bought a $4,000 pickup truck to start their business
2. CNBC video: Junk Teens, how Gen Z brothers built a $3 million a year business
3. Entrepreneur: 2 brothers started a $1.2M side hustle as teens
4. Benzinga: Two Massachusetts teens, YouTube advice, and an old Ford F-150
5. Junk Teens press page