Latest / The Emergency Fund Podcast with Fexingo: Cash Reserves, Saving, and Financial Cushion / How a Side Hustle Buffer Changes Your Emergency Fund
Transcript
- Lucas: So, we've talked a lot about how big your emergency fund should be — three months, six months, maybe more if your income is lumpy. But here's a question I don't think we've tackled: what if you have a side hustle that could replace your paycheck quickly? Does that change the number? Luna: I love this angle. Because for years the conventional wisdom has been 'you need X months of expenses in cash,' full stop. But if you have a second income stream that's flexible and reliable, it feels like you should be able to hold less cash. Lucas: Exactly. Let me anchor this with a number. Bankrate put out a survey in early 2025 — so just over a year ago — and found that 44 percent of U.S. adults have some kind of side gig. That's up from about 38 percent the year before. So this isn't a niche edge case; it's nearly half the workforce. Luna: And that's not just Uber drivers. That includes freelancers, people with a small Etsy shop, dog walkers, virtual assistants. Lucas: Right. So let's build a framework. Say your monthly expenses are $4,000. Standard advice says keep $12,000 in cash — three months. But you also earn $500 a month from a recurring freelance client. You've had that client for two years, steady work, you could probably pick up more hours if you needed to. Does that let you lower your cash target? Luna: I think the intuitive answer is yes. Because if you lose your main job, you still have that $500 coming in. And you could probably scale it up. Lucas: So let's run the math. If you keep your cash at $8,000 instead of $12,000, that's $4,000 less sitting in a savings account earning maybe 4 percent. So you're 'losing' about $160 a year in interest by holding that extra cash. But on the other hand, you're buying insurance — insurance against the risk that your side gig dries up at the same time as your main job. Luna: That's the key risk, right? Correlation. If there's a recession, your main job disappears and your freelance clients might also cut back. Lucas: Exactly. So the side-hustle buffer only works if the income streams are uncorrelated. For example, if you're a graphic designer with a main job at a marketing agency, and your side gig is designing menus for local restaurants, those could both suffer in a downturn. But if your side gig is something like teaching a Saturday art class — people still want enrichment even when the economy slows — that's more resilient. Luna: Or dog walking. People still need their dogs walked regardless of the stock market. Lucas: Exactly. And that's the kind of side hustle that can genuinely reduce your emergency fund target. I'd argue you could comfortably drop from three months to two months if you have a reliable, low-effort side gig that covers at least 30 percent of your monthly expenses. Luna: But what about gig platforms like Uber? That feels more volatile to me. Lucas: Yeah, platform-dependent income is trickier. Uber can deactivate you for any reason. The algorithm changes. Plus, the pay per ride has been declining in many markets. So I wouldn't count that as a reliable buffer. Same with DoorDash or Instacart. The key is recurring, direct-client relationships where you control the flow. Luna: So the side-hustle buffer works best when the side income is, for lack of a better word, 'sticky.' Lucas: Exactly. And there's another angle: the psychological benefit. If you know you have a side gig that can kick in, you might feel less anxious holding a smaller cash cushion. And for some people, that lower anxiety is worth more than the interest differential. Luna: That touches on something we've talked about before — the emergency fund as anti-anxiety insurance. But here it's more like the side gig is the insurance, not the cash. Lucas: Right. And speaking of insurance, I want to give a quick thank you to listeners who support the show. A couple of dollars a month is genuinely what keeps this ad-free and independent. If our money conversations have helped you think about a decision differently, you can find us at buy me a coffee dot com slash fexingo. That's buy me a coffee dot com slash fexingo. Luna: Yeah, it really makes a difference. Even small contributions add up and help us keep producing episodes like this one. Lucas: So back to the side-hustle buffer. Let me give a concrete example. I talked to a listener named Jenna — she's a marketing coordinator in Austin, earns $55,000 a year at her day job. She also runs a small dog-walking business on the side, making about $600 a month. She has four regular clients, and she's been doing it for three years. Luna: That sounds like a perfect case for a reduced fund. Lucas: So she was holding $15,000 in cash — about six months of expenses, which was way too conservative for her situation. We figured she could drop to $10,000 and still be safe, because her dog-walking income covers about 40 percent of her monthly spend. And if she lost her main job, she could probably add two more clients within a week. Luna: What did she do with the extra $5,000? Lucas: She put it into a Roth IRA. Which, by the way, can double as a backup emergency fund because you can withdraw contributions tax-free. So she got the best of both worlds — more invested for retirement, and still a cushion if things go really wrong. Luna: That's a smart move. So the side-hustle buffer isn't just about holding less cash; it's about freeing up capital for higher-return uses. Lucas: Exactly. And the math works out. Let's say she earns 7 percent on that $5,000 in the Roth over time. Over 20 years, that's about $19,000. Versus leaving it in a savings account earning 4 percent, which would grow to about $11,000. So the side hustle effectively earned her an extra $8,000, just by letting her invest more. Luna: That's a powerful argument. But it only works if the side income is truly reliable. What about people who have a side hustle but it's more sporadic? Lucas: Good question. If your side income fluctuates month to month, I'd be more conservative. Maybe only reduce your emergency fund by half the amount you might otherwise. So if your average side income covers 30 percent of expenses, only reduce your cash target by 15 percent. That gives you a margin of safety. Luna: So the formula is: take your average monthly side income, divide by your monthly expenses, and then maybe cut your emergency fund by half that percentage. Lucas: Yeah, that's a good rule of thumb. And I'd also stress-test it. Ask yourself: if I lost my main job tomorrow, how quickly could I increase my side income? If the answer is 'within a week,' then you can be more aggressive. If it's 'maybe a month or two,' then be more conservative. Luna: That brings up another point — the speed of scaling. Some side hustles are easy to scale up, like tutoring or consulting. Others have a cap, like dog walking because you only have so many hours in a day. Lucas: Exactly. So the ideal side hustle for an emergency buffer is one that's scalable, recurring, and uncorrelated with your main industry. And ideally, it's something you enjoy, so you don't mind doing it more if needed. Luna: I keep thinking about the tax implications too. If your side income increases, you might owe self-employment tax. That could affect your net take-home. Lucas: Good point. If you're earning an extra $500 a month, that's $6,000 a year. You'd owe about 15.3 percent in self-employment tax on net earnings, so roughly $918. Plus income tax depending on your bracket. So your actual after-tax side income might be more like $400 a month. That still helps, but you need to factor it in. Luna: So the true buffer amount should be based on your after-tax side income, not gross. Lucas: Absolutely. And one more thing — if you're using the side-hustle buffer, you should also maintain a smaller 'quick access' fund for true emergencies, like a car repair or medical bill. That way you don't have to tap your side hustle capacity for a one-off expense. Luna: That's smart. So you might have $2,000 in a checking account for immediate needs, plus $8,000 in a high-yield savings for the main fund, and then the side hustle as a third layer. Lucas: Exactly. Three layers: immediate cash, invested cash, and income capacity. I think that's a more modern framework than the old 'three months in a savings account' rule, because it reflects how people actually earn and spend today. Luna: And it's more efficient. You're not hoarding cash that could be working for you. Lucas: Right. So if you have a side hustle, it's worth running the numbers. See if you can safely reduce your emergency fund and put that money to better use. But be honest about the reliability and correlation of your side income. That's the key. Luna: And maybe use the calculator on the Fexingo site — we have a tool that helps you model this. Lucas: We do. But even without it, the math is straightforward. Side income as a percentage of expenses, times a safety factor, equals how much you can trim from your cash reserve. That's the takeaway. Luna: Great episode. I think a lot of listeners will find this useful. Lucas: Thanks, Luna. And thanks to everyone who supports the show. We'll be back tomorrow with another angle on your emergency fund.