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Best Compound Interest Investments

Tobi Opeyemi Amure
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Best Compound Interest Investments

Compound interest should be every investor’s BFF.

This tried-and-true strategy takes your money’s earning potential to the next level over time.

However, not all accounts optimise for compounding gains.

Let’s break down how it works and spotlight prime investments to put compounding to work for you.

But, for those short of time, what are the best compound interest investments? The best compound interest investments are high-yield savings accounts, certificates of deposit and index funds. These allow investors to earn consistent returns and automatically reinvest them, steadily growing the principal investment over months and years. Compounding amplifies growth exponentially, making consistent reinvestment critical for maximising returns over long time horizons.

This article was reviewed by Tobi Opeyemi Amure, an investing expert and writer at, and

Compounding 101

Compounding simply means earning interest on interest. Your initial deposit accrues earnings, which then get reinvested back into the principal. This larger pool generates even higher interest earnings in an upward spiral.

Compounding turbocharges returns, but it requires patience. The more time you give your money to grow, the bigger the payoff.

Here’s a good video that helps explain exactly what compound interest is:

Crunching the Numbers

Figuring out compound interest is simple with the right tools:

  • Formulas – Plugin variables to compute future compound interest based on the deposit amount, rate, frequency, and years invested. The formula for calculating compound interest is P = C (1 + r/n)nt – where ‘C’ is the initial deposit, ‘r’ is the interest rate, ‘n’ is how frequently interest is paid, ‘t’ is how many years the money is invested and ‘P’ is the final value of your savings.
  • Rule of 72 – Divide the interest rate into 72 to find how many years to double your investment.
  • Spreadsheets – Built-in future value functions do the math for you.
  • Online Calculators – Convenient free tools forecast compound interest earnings. Here’s one from Nutmeg.

Top Compounding Investments

Now let’s explore some prime accounts and assets for compounding gains:

  • Retirement Plans – Tax-advantaged accounts leverage decades of compounding.
  • Index Funds – Broad market funds reinvest dividends for compound growth.
  • Dividend Stocks – Consistent, growing dividends prime for reinvestment.
  • High-Yield Savings – Online banks offer rates for steady, low-risk compounding.

Calculating Compound Interest

Figuring out potential compound interest earnings doesn’t have to be complicated. Arm yourself with the right tools and formulas to forecast returns.

Compound Interest Formula

The basic compound interest formula is:

P = C(1 + r/n)^nt


  • P = Future value of investment
  • C = Initial deposit amount
  • r = Annual interest rate
  • n = Number of compounding periods per year
  • t = Total years invested
  • Plug in your numbers to determine possible future compound gains.

The Rule of 72

The rule of 72 offers a simpler way to estimate compound doubling time:

72 / Interest Rate = Years to Double

For example, at a 7% rate, an investment doubles in around 10 years (72/7 = 10.3).

Spreadsheet Calculations

Built-in future value functions in Excel or Google Sheets can forecast compound earnings based on inputs.

Online Compound Interest Calculators

Skip the math and use free online tools like the Nutmeg Calculator.

Take advantage of these resources to project your compound interest potential.

Best Compound Interest Investments

Compound interest can be an extremely powerful tool for growing wealth over time.

By reinvesting returns back into the principal investment, previous earnings also begin generating interest.

This creates an accelerating snowball effect that builds substantial value over months, years, and decades.

Savvy investors utilise compounding to maximise returns.

Here are some of the best ways to leverage the compound interest effect:

High-Yield Savings Accounts

Online savings accounts offer FSCS insurance along with interest rates far exceeding traditional brick-and-mortar banks. The highest yields currently range from 3-4% APY.

While rates fluctuate based on the market, these accounts consistently offer steady, low-risk returns. Interest compounds daily and is credited monthly.

Deposits can be made anytime with minimal required opening balances. Easy access makes high-yield savings a great place to park emergency funds, short-term savings goals, or cash reserves.

Money Market Accounts

Money market accounts provide many of the same benefits as high-yield savings, plus the flexibility of check-writing capabilities.

Minimum balances start around £2,500 but can reach up to £25,000. Interest rates are slightly higher than standard savings, generally ranging from 2-3% APY currently.

Compounding occurs monthly. These accounts offer robust FSCS protection along with easy access. The added check-writing makes them ideal for holding funds for near-term use.

Certificates of Deposit (CDs)

CDs allow investors to lock in a fixed interest rate by committing funds for a set period of time, most commonly 1, 3, or 5-year terms.

Early withdrawal results in surrender charges and penalties. In exchange for locking up funds, CDs offer higher interest rates than savings or money market accounts.

Interest compounds based on the term – daily, monthly, quarterly, etc. Upon maturity, investors can withdraw the principal plus all earned interest. CDs provide guaranteed returns useful for fixed-income and conservative portfolios.

Index Funds

Index funds provide instant diversification by mimicking major market indices like the S&P 500. Low management fees, passive investing strategies, and steady compounding of dividends over long time horizons make index funds ideal for retirement investing.

Consistent contributions build substantial principal. Dividends are automatically reinvested to accelerate compound earnings. Index funds are structured for maximal compounding effects over decades.

Tax-deferred retirement accounts magnify the power of compounding even further.

Read my guide on ‘how to invest in index funds UK‘.

Individual Dividend Stocks

Many blue-chip companies pay regular dividends to shareholders. Like index funds, reinvesting dividend payments increases share totals and payouts over time.

Dividend aristocrats with long histories of steady or rising dividends offer especially reliable income streams. Investors can build customised portfolios of dividend stocks tailored to their goals.

Individual stock picking requires more research but offers greater flexibility and potential returns than index funds.

Read my guide on ‘how to invest in stocks UK‘.

Real Estate Investment Trusts (REITs)

REITs allow investors to participate in income-generating real estate without the responsibilities of direct property ownership. REITs own and operate residential, commercial, and other properties.

Required to pay 90% of taxable income as shareholder dividends, REITs generate consistent dividend yields averaging 3-4%. Reinvesting distributions provide compound growth.

REITs also trade on major exchanges, offering stock price appreciation potential. Their passive real estate investing and ample dividends make REITs a powerful compounding vehicle.

Read my guide on ‘how to invest in REITs UK‘.

The key takeaway? Time and consistent compounding amplify investment earnings. By picking the right assets and reinvesting all returns, investors leverage exponential growth through the power of compound interest.

Choose the account type aligned with your goals, timeline, and risk tolerance to optimise compounding gains.

Additional Ways to Earn Compound Interest

Beyond the usual ways, some alternative investment avenues can also generate compounding returns over time:

  • Real Estate – Physical properties can appreciate and generate rental income for compound growth. Requires large upfront capital and active management.
  • Fine Art – Artworks can increase in value over decades. Specialised niche with high transaction costs.
  • Crowdfunding – Pool money with others to fund businesses or projects. Higher risk but the potential for high rewards.
  • Cryptocurrencies – Digital assets like Bitcoin. Volatile but can see exponential growth through compounding.

Will Compound Interest Make You Rich?

Given enough time, compound interest can generate substantial wealth. But there are no guarantees.

Consider the following:

  • Start early and invest consistently
  • Reinvest all earnings
  • Avoid withdrawals if possible
  • Match risk tolerance
  • Long-time horizons optimise compounding
  • Research investments thoroughly

Building wealth through compounding requires patience and discipline. Stay focused on the long game.

Final Thoughts

Harnessing the power of compounding interest takes patience and discipline, but the long-term payoff can be immense.

As you explore compounding investment options, keep these key factors in mind:

  • Principal Amount – Consider minimum deposits. Invest what you can afford to set aside.
  • Time Horizon – The longer the better. Decades optimise compound growth.
  • Interest Rates – Compare rates across accounts. Higher is better.
  • Compounding Frequency – Monthly or quarterly is ideal. Faster compounding builds wealth.

Investing is a marathon, not a sprint. With smart choices and a consistent, long-term approach, compound interest can help you reach your financial goals.

The key is starting early, reinvesting earnings, and letting time work its magic. Compounding interest rewards commitment with exponential growth.

Do your research, select the right accounts for your goals, and let your money grow. Compounding interest can be a powerful ally in building wealth over decades. The time to start is now!


How can I grow my money with compound interest?

To grow your money with compound interest, consider long-term investment options like stock market index funds, mutual funds, or bonds that offer compounding returns. Make regular contributions and reinvest earnings such as interest, dividends, and capital gains back into the investment, allowing the interest to compound over time. The key is to start as early as possible and keep your money invested to take full advantage of the power of compound interest.

What is the best investment account for compound interest UK?

In the UK, the best investment accounts for compound interest might include Individual Savings Accounts (ISAs), specifically Stocks and Shares ISAs, or Self-Invested Personal Pensions (SIPPs). These accounts allow for investments in assets like mutual funds, index funds, and bonds that offer compounding returns. Choose an account that not only offers a wide range of investment options but also aligns with your financial goals and risk tolerance to take full advantage of compound interest.

Which banks offer compound interest UK?

In the UK, most high street banks and online financial institutions offer savings accounts that feature compound interest, although rates may vary. Examples include Barclays, HSBC, and Nationwide, among others. Be sure to compare interest rates, how often interest is compounded, and any additional terms or fees when choosing a bank for compound interest savings.

Is there compound interest in the UK?

Yes, compound interest is available in the UK across various financial products, including savings accounts, investment accounts, and certain types of loans. Banks, credit unions, and online financial platforms often offer accounts that feature compound interest, allowing your earnings to be reinvested to generate additional earnings over time.

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Will Fenton is the founder of Sterling Savvy. He is a personal finance expert and writes about trading, investing, budgeting, and other financial topics.

Along with his education in Economics & Finance, he has experience working in the financial services industry in London working for one of the UK’s leading financial companies, “a trustworthy and respected provider of news, education and market analysis for the everyday investor”.

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