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Own It and Run ItStraight answers for anyone under 18 trying to run a small business

Taking Cash, and Taking It Safely

Sources last read 2026-08-18.

Short answer

Cash is the only way of being paid that nobody has put an age on. That is why so many people your age end up using it. It has two costs. There is no record, so if somebody says they paid you, there is nothing to hold up. And it puts you in a place with a person and money at the same time. Both of those are handled the same way: agree the number first, keep the amount small, and do not do it alone.

Why so many people your age end up on cash

Every app has an age on the money. Cash does not.

So the honest picture is that a lot of under 18 business runs on notes and coins, and that is not a failure. It is often the sensible answer for a mowing round, a car wash or a repair job in your own street.

It costs you two things, and both are worth knowing before you start.

There is no record. Nothing to screenshot. If someone says they already paid, it is your word against theirs, and neither of you can prove it.

You are standing there with money. That is a different situation from money moving between two apps, and it deserves a bit of thought rather than none.

What a safe exchange space actually gets you

A lot of police departments now mark parking spaces for people meeting to buy and sell things. They are real, they are free, and using one is a good idea.

Then read what the departments themselves publish about them.

Vancouver, Washington says plainly that its police personnel will not assist with any transactions. Charleston, South Carolina says its employees cannot act as an official witness to transactions, do not give legal advice, and will not settle civil disputes related to any transactions.

So here is the honest version. A safe exchange space is a lit, busy, camera covered spot where a person who was planning something would rather not be. That is genuinely useful.

What it is not is supervision. Nobody inside that building is watching your meeting or waiting to step in. Any page telling you those spaces are police supervised is telling you something that is both false and dangerous to believe.

Use one. Take an adult anyway.

The house question, which has one answer

Charleston publishes the rule in one line: do not invite strangers into your home, and do not go to theirs.

Plenty of real work happens at somebody's house. Dog walking, tidying a yard, fixing a bike in a garage. It is not that you can never go.

An adult goes with you into somebody else's house. Not a friend, and not a lift there and back.

The same adult knows the address, when you went in, and when you came out.

The federal workplace safety agency builds its guidance for people working alone in other people's homes around exactly that: a way to call for help, knowing your way out, and a check in and check out system. That guidance is written for employers. You do not have one. So the person you check in with is a parent.

Handling the cash itself

The same agency writes cash rules for shops. Scale them down and they fit a person with a mowing round almost exactly.

  1. Refuse the big notes. Their line is to prohibit transactions with large bills over twenty dollars. For you that is mostly about change, and about not walking home with a lot of it.
  2. Keep what you are carrying as low as practical. Their words. Two jobs of takings in your pocket is fine. A whole Saturday of it is not.
  3. Do not carry the day's money on you. Drop it home between jobs if you can. Shops are told the same thing about their takings for the same reason.
  4. Use the buddy system. Again their words, and they say it especially applies when safety may be threatened. Somebody comes with you.
  5. Count it there, in front of them. Not in the street afterwards. It is not rude. It ends the argument before there is one.

Say the number before you start

Almost every cash problem is really a number problem.

Agree the price out loud before you do the work. Agree what happens if the job turns out bigger. Agree that they will have the right money, or that you will not have change.

Then say it back to them once. "So that is thirty dollars when I finish, and you have got the thirty." Ten seconds. It removes most of what goes wrong.

An example, to show the shape of it

Renee is 15 and washes cars around her street, always with her dad there, always in daylight.

A neighbour books two cars. At the end he has a hundred dollar note and nothing smaller. Renee has eleven dollars in change. He says he will catch her next week.

Next week he is away. The week after he says he already sorted it, and he genuinely thinks he did. Nobody is lying. There is just nothing to point at.

What she does now is one line when the job is booked: forty dollars, cash, and could you have it in tens. Nobody has ever found that rude. It has not happened again.

When it goes wrong anyway

It will, sometimes. Cash has no undo and no dispute button.

There is a page here on what to do when somebody does not pay, and the short version is that with cash your options are thinner than with anything else. Which is a reason to be careful up front, not a reason to avoid cash altogether.

Questions people actually ask

Is it legal to just take cash?

Yes. Being paid in cash for work you did is normal and there is no age rule on it. What people usually mean by that question is tax, and that is a real subject with a real answer, just not one this site covers. I write another site, teensandmoney.com, and its page on money from side jobs is the place to read it.

Should I give somebody a receipt?

Write down every job either way. Date, name, what you did, how much. A note on your phone is enough. It is not about proving anything to an official. It is so that six weeks later you know whether the person who says they already paid you actually did.

Somebody wants to pay me with a hundred dollar bill.

Say you cannot break it, and say it early rather than at the end. The federal workplace safety agency tells shops to refuse notes over twenty dollars, and the reason scales down to you exactly. You end up carrying a lot of change, or you end up owed money. Ask for the right amount, or agree how they will pay before you start.

What about the apps where you tap phones?

Read the age rules on the app first, and read them properly. Some of them let you have an account at 13 and still will not let money for a job land with you. There is a full list on this site, with each company's own words.

Do the police safe exchange spaces make it safe?

They make it better. They do not make it watched. Vancouver, Washington says its officers will not assist with any transactions. Charleston, South Carolina says its employees cannot act as a witness and will not settle disputes. It is a lit parking space with a camera on it. That is worth having. It is not a person looking out for you.

Where this came from

Vancouver, Washington Police Department, safe exchange zones
cityofvancouver.us

Charleston, South Carolina, safe exchange zones
charleston-sc.gov

Federal workplace safety agency, publication 3153 on cash handling
osha.gov

Federal workplace safety agency, publication 3148 on working alone
osha.gov

teensandmoney.com, babysitting, mowing and taxes
teensandmoney.com