When people list the financial mistakes small business owners make, they usually list habits: not tracking spending, not saving, not paying yourself. Those matter, and I’ve written about the habits and patterns that keep you stuck. But some of the most expensive mistakes aren’t habits at all. They’re single decisions, made on one ordinary afternoon, that keep costing you for years.
A price you promised “forever.” A project you started without a deposit. A program you put on a card because the sales page made your heart race. You make the decision once, and then you live inside it.
When I started out, I found my first five clients by cold-emailing businesses out of the phone book. (Yes, the phone book. OGs know.) The hustle was fine. A few of my early decisions, though, could have used a second set of eyes.
Short answer: Many of the biggest financial mistakes small business owners make are single decisions that are hard to undo: launching with a “for now” price that never ends, starting work without a deposit, leaving first-year taxes for April, financing a big purchase on high-interest debt, buying a solution before naming the problem and leaving a job without a number. Avoid them by asking how hard a decision is to undo before you make it. The harder it is to reverse, the smaller you test it first and the more you want a second set of eyes.
Why do the costliest financial mistakes small business owners make come down to one decision?
Because a habit can change next week, but some decisions lock in for months or years. A price you promised, a contract you signed or a debt you took on keeps working long after the moment has passed.
The upside is that decisions are easier to catch than habits. A habit sneaks up on you. A decision has a moment you can see coming: a sales page, a contract, a launch, a resignation letter. That moment is where a little friction pays off.
The Undo Test
Before any big money decision, ask three questions:
- How hard is this to undo? Easy, costly or locked in.
- What would it cost if I’m wrong? Write it in dollars and in months.
- Who besides me has looked at it? A CPA, a coach, a contract review or a friend who’s wise with money all count.
Then let the answer set your speed:
| How hard to undo | Examples | How to decide |
|---|---|---|
| Easy | A monthly tool, a new price on one proposal | Decide quickly, then review it in 30 days |
| Costly | An annual contract, financing equipment, a new contractor | Try a smaller version first |
| Locked in | A “forever” promise, a business structure, quitting your job | Get a second set of eyes before you commit |
Most decisions are easy to undo, so make them fast and learn as you go. The Undo Test is for the few that aren’t.
What are the biggest financial mistakes small business owners make?
The first three show up early, often in your first year or your first launch.
1. Launching with a “for now” price that never ends. Founding prices are lovely. The mistake is “forever.” Without an end date in writing, every client or member at that price stays locked in until they leave, and raising it later feels like breaking a promise. The fix: put a term on it from day one, like “founding price for your first 12 months.”
2. Starting work without a deposit or a signed agreement. This single decision shifts all the risk onto you. If the client disappears, changes the scope or pays late, you have very little leverage. The fix: no start date until there’s a signed agreement and a deposit. Every time. Even for friends. Especially for friends.
3. Leaving your first year’s taxes for April. When you’re self-employed, nobody withholds tax from your payments, so the bill can arrive all at once. The fix: set aside a percentage of your very first payment and every one after it, and keep simple records from day one. The IRS points out that good records help you monitor your business and prepare your tax return. And before you choose a business structure because a stranger online said it “saves taxes,” book an hour with a CPA. (I’m not your CPA, and this is exactly the kind of decision one should weigh in on.)
Which financial mistakes do small business owners make while trying to grow?
The next three tend to arrive with ambition, which is why they’re so easy to say yes to.
4. Financing a big purchase on high-interest debt with no payback plan. The program, the equipment or the ad budget goes on a card because the timing feels urgent. If it doesn’t pay back quickly, the interest outlives the excitement. The fix: write the payback plan before you buy, including what happens if it brings in nothing. (If you’re already there, here’s how to pay down business debt without stalling growth.)
5. Buying the solution before you’ve named the problem. A new website, a rebrand, a course or a shiny tool can all be wonderful investments. The mistake is buying one to make a feeling go away. The fix: finish this sentence first: “This will fix ___, and I’ll know it worked when ___.” I build websites and brands for a living, so trust me: the best ones start with that sentence.
6. Leaving your job without a number. Leaping isn’t the mistake. Leaping without knowing how many months your savings can carry you is. The fix: work out your leap target and your runway before you hand in your notice. Runway to Leap does that math for free.
A worked example: the founding price that never ended
Let’s say you launch a membership at a $29-a-month founding price, “locked in forever,” and 60 people join. (This is a hypothetical.) A year later, your regular price is $49.
That promise now costs $20 a month for each of 60 members, or $14,400 a year, for as long as they stay.
Run it through the Undo Test:
- How hard to undo? Locked in. You promised.
- Cost if wrong? $14,400 a year, possibly for years.
- Who else looked at it? Nobody. It felt generous, and it was.
Now the alternative: the same $29 founding price, “locked for your first 12 months.” Your founding members still get a generous year. And in month 13, you can move to your regular price with plenty of notice and zero broken promises. Same generosity, with an exit built in.
How do I recover from a money mistake I’ve already made?
Forgive it, contain it, then fix it forward. Most financial mistakes small business owners make can be softened after the fact, and shame only makes them more expensive.
- Contain it. Stop the decision from spreading: no new clients at the old terms, no new charges on that card.
- Fix it forward. Change the terms for everything new, starting today.
- Choose a kind, honest exit for the old one. That might be an end date with generous notice, a payoff plan or a conversation with your CPA.
Try this today: run the Undo Test (15 minutes)
- Write down one money decision you’re facing now, or one you made in the past year.
- Rate it: easy, costly or locked in.
- Write what it would cost if you’re wrong, in dollars and in months.
- If it’s costly or locked in, sketch a smaller test version and name who will look at it with you.
- Finish the sentence: “This will fix ___, and I’ll know it worked when ___.”
If you can’t finish that sentence yet, that’s your answer for today.
If you want a second set of eyes
The Undo Test works best with another person in the room, because it’s hard to see your own blind spots on a decision you’re excited about. That’s what my coaching is for: a thinking partner for the things that don’t fit neatly into a template. It can be one session when you have one clear decision to work through, or ongoing support while things evolve. You don’t have to arrive prepared. Come with a question. Leave with clarity.
Quick answers
What financial mistakes do small business owners make most often?
Common financial mistakes small business owners make include habits like underpricing and paying themselves last, plus single decisions that are hard to undo: “forever” founding prices, starting work without a deposit, leaving first-year taxes for April, financing purchases on high-interest debt, buying solutions before naming the problem and leaving a job without knowing their runway.
How can small business owners avoid costly financial mistakes?
Small business owners can avoid costly financial mistakes by slowing down only the decisions that are hard to undo. Before a big commitment, ask how hard it is to reverse, what it would cost if you’re wrong and who else has looked at it. Test risky decisions in a smaller version first, and get a second opinion on anything locked in.
Should I offer a founding price for a new offer?
A founding price can be a generous way to reward early clients and test a new offer. The key is giving it an end date in writing, such as the first 12 months or the first project. A founding price with no end date can lock you into below-market pricing for years and turn every future price change into a broken promise.
Should I always ask for a deposit before starting client work?
Yes, asking for a deposit before starting client work is a smart standard for most service businesses. A deposit and a signed agreement protect your time, reduce the risk of late or missing payments and show that the client is committed. Apply the rule to everyone, including friends, so it never feels personal.
When should I talk to a CPA about my business?
Talk to a CPA about your business early, ideally before your first tax season and before choosing or changing your business structure. A CPA can help you set a tax set-aside percentage, explain estimated payments and review big decisions like entity choice. One early conversation often costs far less than fixing a decision later.
You’re going to make money decisions forever. Not all of them need to be slow. Just give the locked-in ones a pause and a second pair of eyes.