How to Invest Extra Cash: What to Do With $10K+ in Savings
If you have $10K, $20K, $50K—or more—sitting in savings, you might be wondering how to invest extra cash without accidentally investing money you actually need.
Got $10K, $20K, $50K—or more—sitting in savings?
First of all: amazing. You have money to work with.
But once you’ve built an emergency fund, there comes a point when accumulating more and more cash may not be the best way to grow your wealth.
The question shifts from:
“How do I save more money?”
to:
“How much cash do I actually need—and what should I do with the rest?”
If you have extra cash sitting in savings, you don’t necessarily need a bigger paycheck before you start building more wealth.
You may need to optimize the money you already have.
Here’s how I think about when to keep cash, when to invest extra cash, and what to look at before moving that money.
What Should You Do With $10K+ Sitting in Savings?
The short answer: first make sure you have enough accessible cash for emergencies and near-term expenses. Then you can start evaluating whether the rest belongs in investments instead of continuing to accumulate cash.
I personally tend to keep around $10K–$20K in cash because my expenses are unusually low. When I have significantly more cash than I need, I look for opportunities to invest it rather than automatically letting the balance keep growing.
Your number could be completely different.
Someone supporting a family, paying a mortgage, preparing for a major purchase, or relying on one income may need significantly more accessible cash.
The important part isn’t copying someone else’s magic number.
It’s knowing what YOUR cash is for.
1. Figure Out How Much Cash You Actually Need
Before you invest extra cash, separate your emergency money from money that doesn’t have an immediate job.
A common emergency-fund guideline is several months of necessary expenses, but your appropriate amount depends on your circumstances.
Ask yourself:
How much would I need if my income disappeared tomorrow?
Think about your essential monthly expenses, job stability, other household income, people who depend on you, and upcoming expenses you already know about.
Money you’ll need soon generally has a very different job from money you’re trying to grow over many years.
That’s why I don’t look at a $30K savings balance and immediately say:
“INVEST IT ALL!”
I want to know what that $30K is for.
Maybe $15K is your emergency fund.
Maybe $5K is for something you’re buying next year.
And maybe the remaining $10K is sitting there because you don’t know what else to do with it.
That’s the money I want you to start getting curious about.
2. Make Sure Your Cash Is Actually Earning Money
Before we even talk about investing, let’s fix where your cash is sitting.
If you’re keeping $10K+ in cash, I don’t want it languishing in a checking or savings account earning pennies.
At minimum, I want cash reserves earning a competitive interest rate in an appropriate savings vehicle, such as a high-yield savings account.
One of my clients had five figures sitting in a Bank of America savings account earning almost nothing. We moved that cash into a high-yield savings account so the same money could earn substantially more without requiring her to earn another dollar.
That’s what I mean when I talk about optimizing your money.
Before asking yourself how to make more, ask:
Is the money I already made working as hard as it could?
3. Decide Where to Invest Your Extra Cash
Once you’ve identified money that doesn’t need to remain in cash, the next question is:
Where should I invest it?
And this is where I see people get overwhelmed.
They start Googling.
They watch TikToks.
They read 19 Reddit threads.
Suddenly they’re comparing Roth IRAs, 401(k)s, brokerage accounts, rollovers, index funds, target-date funds and a bunch of other sh*t.
Then they get so overwhelmed that the $10K stays exactly where it was.
Instead, I like to look at your existing financial ecosystem first.
Do you have a workplace retirement account?
An old 401(k)?
A Roth IRA?
A brokerage account?
Are you self-employed?
Do you have multiple investment accounts scattered everywhere?
You may not need another account. You may need to understand and optimize the ones you already have.
Should You Roll Over an Old 401(k)?
Not necessarily.
One of the first things I look at with my clients is where their old 401(k)s are and what’s happening inside them.
I don’t automatically tell someone to roll over an old 401(k).
I want to know:
What is it invested in? What fees are you paying? What investment options do you have? Does moving it actually improve your situation?
My own 401(k) from the job I left in 2020 had around $30,000 in it when I quit. I never rolled it over because I was comfortable with the account, its costs, and my investments. It has continued growing since I left.
Moving money around just to feel productive isn’t optimization.
Understanding why your money is where it is—that’s optimization.
Having an Investment Account Doesn’t Mean You’re Invested
This is HUGE.
You can open an IRA or contribute to a 401(k) and still not understand what your money is actually invested in.
I’ve seen this with clients.
One of my early coaching clients had a 401(k) that was barely moving because of what she’d selected inside the account. We reviewed what she owned and changed the investments so they better matched what she was trying to accomplish.
That’s why I don’t want you stopping at:
“I have a 401(k), so I’m good.”
Open it.
Understand it.
Know what you own.
Know what you’re paying.
Know why you chose it.
Your account is the container.
The investments inside it are what determine how that invested money behaves.
What About Roth vs. Pre-Tax Accounts?
This is another question I consider when deciding where to invest extra cash.
A Roth account generally involves contributing money that has already been taxed, with qualified withdrawals potentially being tax-free later. Traditional retirement contributions can offer different tax treatment.
Neither decision should be made simply because somebody on the internet screamed ROTH!!! at you.
Your income, taxes, retirement plans, employer options, and other circumstances matter.
The point is to make these decisions intentionally rather than choosing whatever default appeared when you enrolled in your benefits.
Stop Waiting for a Bigger Paycheck to Optimize Your Money
This is the part I want you to take away from all of this.
You can absolutely work on increasing your income.
Make more money! I love money!
But don’t let “I’ll optimize everything once I make more” become the reason $10K, $20K or $50K sits untouched for another three years.
I’ve built a net worth of more than $250K without ever paying myself more than $45K a year.
A huge part of that has been learning to optimize what I already have: keeping my expenses intentionally low, putting cash in the right places, investing money I don’t need sitting around, and understanding what I actually own.
Your next wealth milestone may not require you to magically double your salary first.
You might already have money that could be doing more.
So, Should You Invest That $10K Sitting in Savings?
Maybe—but don’t start by blindly transferring $10K into an investment account.
Start by asking:
1. How much cash do I actually need accessible?
2. Is the cash I’m keeping earning a competitive return for cash?
3. Where should my remaining money go based on the accounts and investments I already have?
That’s the order.
Because building wealth isn’t about throwing every available dollar into the stock market.
And it isn’t about hoarding every dollar in savings because investing feels scary.
Listen to Unicorn Millionaire Episode 152: How to Invest $10K+ Sitting in Savings
In my latest Unicorn Millionaire Podcast episode, I go deeper into how to invest extra cash.
“How to Invest $10K+ Sitting in Savings” 🦄
🎧Listen to Episode 152 of the Unicorn Millionaire Podcast on Spotify
🎧Listen to Episode 152 of the Unicorn Millionaire Podcast on Apple Podcasts
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About Charly
I’m Charly Stoever (@travelercharly) — a trans Latinx money coach, speaker, and host of the Unicorn Millionaire Podcast. I help LGBTQ+, BIPOC, and first-gen folks crush debt and build a six-figure retirement—even without a six-figure salary.
As a formerly undocumented Mexican American and ex-stockbroker who’s traveled solo to 39 countries, I now coach full-time while also international pet sitting.
If you’re ready to stop avoiding your finances and start using your money on purpose, work with me.
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