Latest / Solopreneur Sessions with Fexingo: One-Person Businesses, Freelancing, and Independent Work / How a Solo Founder Turned a Simple Calculator Into a Business
Transcript
- Lucas: So there's this guy, let's call him Mark, who runs a one-person software business built entirely around a salary calculator. Not a tax preparation suite, not an accounting platform — just a calculator that tells freelancers how much they should be charging, after taxes and expenses. Luna: A salary calculator? That's... oddly specific. How did that become a business? Lucas: Well, that's what I wanted to dig into. The story starts a few years back when Mark was freelancing himself and kept getting blindsided by tax bills. He'd quote a day rate, think he was making a good living, and then a chunk would vanish in April. So he built a simple spreadsheet to figure out his effective take-home, factoring in local taxes, self-employment tax, and business deductions. Luna: So he solved his own problem first. That's the classic origin story. Lucas: Exactly. And like a lot of solopreneurs, he shared the spreadsheet on a forum for freelancers, and people started asking for help customizing it. One thing led to another, and he turned it into a web app. The first version was free — just a simple calculator that asked for your annual income and your state, and gave you an estimated take-home and an effective hourly rate. Luna: Free? That's a bold move. How did he make money off of that? Lucas: He didn't, at first. But the free version did something important — it built trust. People used it, loved it, and shared it. Within a year, he had tens of thousands of users, and he started getting requests for features. Freelancers wanted to factor in business expenses, retirement contributions, even different tax scenarios. That's when he realized the free calculator was just the front door. Luna: So the free version was the marketing, and the paid version was the actual product. That's a classic freemium funnel. But what did he charge for? Lucas: The paid tier, which he launched about two years in, costs around six dollars a month. It unlocks a bunch of things: you can save your profile, run unlimited scenarios, and import your actual expenses to get a more accurate number. But the real kicker is the 'tax engine' — it updates automatically with the latest tax rules, so your calculation is always current. That's the part he says people pay for, because tax laws change every year and nobody wants to do that math by hand. Luna: Six bucks a month doesn't sound like much, but if he has a few thousand subscribers... that's real recurring revenue. Lucas: Right, and that's what I want to get into. But before we dive into the numbers, I want to pause for a second. You know, a lot of these shows exist because of people who support them on buy me a coffee dot com slash fexingo. And honestly, a couple of dollars a month is genuinely what keeps these going — it's what keeps the podcast ad-free and lets us dig into stories like this. Luna: Yeah, it's a small thing that makes a huge difference. And I think we can say it because we've seen it — even a handful of supporters can cover the hosting costs and our coffee budget. Lucas: Exactly. So if you've gotten something out of these conversations, and you want to keep them coming, that link is buy me a coffee dot com slash fexingo. No pressure, but it means the world. Okay, so let's get back to Mark and his calculator. Where were we? Ah, right — the revenue. Lucas: So Mark was kind enough to share some numbers with me. As of this summer, he's got about 4,500 paying subscribers. At six dollars a month, that's roughly 27,000 dollars in monthly recurring revenue. And his costs are minimal — the app runs on a couple of servers, he uses a payment processor, and he's the only employee. He says his profit margin is around 90 percent. Luna: 90 percent margin? That's wild. But what about the competition? There are probably other tax calculators out there. What makes his different? Lucas: That's the key question. And the answer is accuracy. Mark obsesses over getting the tax calculations right. He spends hours cross-checking the IRS tax tables, state-specific rules, and even local city taxes. He's built a reputation as the most accurate calculator for freelancers, and that's become his moat. People trust the number it gives them, and that trust is hard to copy. Luna: So it's not just about the features, it's about being the source of truth. That's a smart position. Lucas: Yeah, and he's also built a community around it. He has a newsletter where he shares tax tips for freelancers, and he's active on Reddit and Twitter, answering questions. He's not just selling a calculator; he's become a go-to resource for freelancers who want to understand their finances. Luna: That makes sense. So the calculator is the product, but the relationship is the business. How did he grow it initially? Lucas: The initial growth was mostly organic. He posted the free version on a few freelance subreddits and it took off from there. People shared it because it was genuinely useful. He also got some press from a couple of freelance blogs, which helped. But he says the biggest driver is word of mouth — freelancers talk to each other, and when someone mentions they're getting killed by taxes, someone else says 'use this calculator.' Luna: Word of mouth is powerful, but it can be slow. Did he ever pay for ads or do any kind of growth hacking? Lucas: He told me he tried a few small Facebook ads early on, but the conversion rate was poor. The problem was that the calculator is free, so people would use it and leave without signing up. It wasn't until he added the paid tier that he started thinking about conversion funnels. Now, he does things like email onboarding to get people to try the paid features, and he has a 'how much are you leaving on the table' prompt that shows users the potential savings. That's been effective. Luna: That's a clever hook. It's not just telling them what they owe, it's showing them what they could save. That's a much more compelling reason to subscribe. Lucas: Exactly. And it's a reminder that the best marketing often comes from understanding your customer's pain points. Mark knew that freelancers fear tax season, so he built a tool that reduces that anxiety. The fact that it's accurate and saves them money is just the cherry on top. Luna: What about the future? Where does he see the business going? Lucas: He's thinking about expanding into other tools for freelancers — maybe an expense tracker or a retirement savings calculator. He's also considering a premium tier that includes a human tax review, but he's hesitant because that would require hiring help, which would break his one-person status. For now, he's happy with the size of the business. Luna: That's refreshing to hear. Not everyone wants to scale into a team. Some people just want a sustainable solo business. Lucas: And that's the takeaway, I think. Mark's story isn't about building a unicorn. It's about finding a niche, building trust, and creating a product that solves a real problem. He turned a spreadsheet into a business that now makes him a comfortable living, and he did it without outside funding or a big team. Luna: So what's the one thing our listeners should take away from this episode? Lucas: I'd say this: don't underestimate the power of a simple, useful tool. You don't need a revolutionary idea to build a business. Sometimes, all you need is a tool that does one thing incredibly well, for a specific group of people, and then treat them with respect. Mark's calculator is about as mundane as it gets, but it's become the backbone of his business because he cares about accuracy and his users. Luna: And that's a lesson we can all apply, whether you're a developer, a writer, or a designer. Find a problem, solve it better than anyone else, and you might just have a business on your hands. Lucas: That's the show for today. Thanks for listening, and we'll catch you in the next episode.