Yes, Compound Interest Is Magic. Watch Me Double My Savings in One Year (2024)

Compound interest can either be an angel or a devil. In a savings account, compound interest lets you earn interest on top of interest, helping to accelerate the growth of your savings. But if you have high-interest credit card debt, compound interest makes the balance you owe greater and greater.

There must be a reason Albert Einstein famously referred to compound interest as “the eighth wonder of the world.” To paraphrase: Anyone who understands compound interest, earns it. Anyone who doesn’t understand compound interest, pays it.

Due to inflation and the Federal Reserve’s ongoing battle to tame price growth, interest rates are currently high. When interest rates are steep, the compound interest on your credit card debt puts you further in the red. However, steep interest rates also allow savers to better leverage the power of compound interest in a high-yield savings account.

That’s why I opened a top-yielding savings account for Christmas. I deposited $1,000, set up automated transfers from my checking account and plan to see my savings double in just one year -- without lifting a finger. Here’s how I’m growing my savings with the help of compound interest.

What is compound interest?

Compound interest is a powerful and simple way to have the value of your savings increase, but you’ll need the right savings account, money market account or investment tool, like a certificate of deposit.

When you put money into an account that earns compound interest, you aren’t just earning interest on your initial deposit amount (known as the principal). Your interest also earns interest, therefore growing your account balance. In contrast, simple interest applies to the principal only.

For example, if you deposit $1,000 in a high-yield account that earns a 5% annual percentage yield and compounds interest daily, you’d end up with a balance of about $1,051 in one year without making any additional contributions. Assuming that the same 5% APY is applied to your new balance, you’d end up with $1,105 after the second year.

According to S&P’s Global Financial Literacy survey, people who don’t understand the concept of compound interest tend to borrow more and save less while running up bigger debts and getting higher interest rates on loans. When we understand compound interest, we can make better decisions about where to put our money.

Read more: How Savings Interest Works

Why go with a high-yield savings account?

Stashing money in a high-yield savings account is a low-risk way to take advantage of compound interest and maximize the growth potential of your returns. The top high-yield savings accounts currently earn APYs as high as 5.35%, more than 10 times the national average of savings account rates at 0.47%.

In December, I opened a high-yield savings account with Ally that earns 4.35% APY. Compare that to my previous savings account at my local credit union, which earned a paltry 0.01% APY. As a general rule, online-only banks consistently offer better APYs on savings accounts because they have fewer overhead costs than banks with physical branches.

Here’s what the interest looks like for each account after one year based solely on an initial deposit of $1,000:

That’s an extra $45 just for parking my savings in a higher-yield account. Keep in mind, however, that savings accounts earn a variable interest rate, meaning the APY can change anytime. Though accounts with variable interest rates can be unpredictable, interest rates for top-yielding savings accounts are expected to stay high for a while.

How I plan to double my savings in one year

I’m pretty vocal about my journey of paying off student loan debt and learning new ways to save while juggling debt. It’s all about finding the right balance for your financial situation.

Small strides are still strides in the right direction. You don’t need to set aside $100,000 to make noticeable gains with your savings.

After depositing $1,000 of savings into a HYSA with Ally last year, I’ll be able to double that figure in one year without making huge sacrifices or even budgeting much. Here’s how I’m doing it and how you can too.

1. Deposit $1,000 (or any amount) into a high-yield savings account

Start by depositing $1,000 or a suitable amount in a high-yield savings account that earns 4% to 5% APY. Ally’s high-yield savings account currently earns 4.35% APY, but you can find savings accounts with rates as high as 5.35% APY. Make sure your initial deposit is a comfortable figure that you can put aside for at least a year without needing to withdraw it for daily expenses.

2. Set up automatic transfers of $25 per week

Set up automatic recurring transfers to move money into your savings account on a weekly, monthly or quarterly schedule that works for your finances. Automating your contributions is a way to “set it and forget it.” You won’t ever have to manually deposit funds into your account, and your savings will still grow consistently.

In my case, I set up a recurring automatic transfer of $100 from my checking account into my Ally savings account every month, which breaks down to $25 a week. It’s a reasonable amount based on my income, debt and expenses, but the exact amount you set aside will depend on your budget.

3. Watch your balance double

Assuming the APY on my account stays around the same throughout the year, I’ll watch my balance more than double due to a combination of those monthly transfers and compound interest. Since interest rates are variable and could change once the Fed initiates rate cuts, I’ll reassess my contributions and adjust my projections when the time comes. Lucky for me, savings rates are expected to stay elevated for a while.

After one year, my $1,000 will turn into around $2,271. Not too shabby.

Is there a downside to compound interest?

When compound interest applies to your savings earnings, you’ll be able to get more value over time, though you’ll always have to factor in APY and the length of time you invest. If the APY on your account is far below 1%, compound interest will likely amount to a few extra pennies.

Keep in mind that any interest you earn from a savings account is considered taxable income by the IRS. When tax season rolls around, you’ll have to include the interest you earned for the filing year on your federal tax return.

If you want to significantly boost your wealth, this savings strategy might be too “G-rated” for you. Investing your money in the stock market could get you greater returns in the long term, but you’ll have to evaluate your risk tolerance.