Interest Rates: What They Are and How They Affect Borrowing and Saving

Interest rates are an important part of many financial products. They can affect the cost of borrowing money and, in some situations, the return earned on savings or deposits.

Understanding how interest works can help people compare financial products and better understand the potential cost or return associated with different financial decisions.

What Is an Interest Rate?

An interest rate is generally expressed as a percentage and represents the cost of borrowing or the return associated with certain savings and financial products over a specified period.

The exact way interest is calculated depends on the financial product, agreement and applicable terms.

How Interest Affects Borrowing

When money is borrowed, interest can increase the total amount that must eventually be repaid. The total borrowing cost may depend on the loan amount, interest rate, repayment period and other applicable charges.

For longer repayment periods, borrowers may make more interest payments over time, depending on the loan structure.

How Interest Can Affect Savings

Some savings and deposit products may pay interest on money held with a financial institution. The actual return can depend on the interest rate, account terms, compounding method, taxes and other conditions.

Fixed Interest Rates

A fixed interest rate generally remains unchanged for a defined period or according to the terms of the financial agreement.

This can make future payments or expected interest calculations more predictable during the applicable period. However, the specific terms of a fixed-rate product should always be reviewed carefully.

Variable or Floating Interest Rates

A variable or floating interest rate can change over time based on the structure of the financial product and relevant benchmarks or policies.

Changes in the interest rate may affect future borrowing costs or returns. This can create uncertainty because future rates may be higher or lower than current rates.

Simple Interest and Compound Interest

Simple Interest

Simple interest is generally calculated using the original principal amount according to the applicable rate and time period.

Compound Interest

Compound interest involves interest calculations that can take previously accumulated interest into account, depending on the product and compounding structure.

The frequency of compounding can influence how interest accumulates over time.

Factors That Can Influence Interest Rates

Interest rates can be influenced by a variety of economic and financial factors. Depending on the country, product and institution, these may include:

• Inflation and inflation expectations
• Central bank policies
• Economic conditions
• Market demand for credit
• Credit risk and borrower profile
• The type and duration of the financial product

What Should Borrowers Consider?

Before taking a loan, it can be useful to look beyond the stated interest rate and understand the complete borrowing arrangement.

• Total repayment amount
• Applicable fees and charges
• Fixed or variable rate structure
• Repayment schedule
• Possible consequences of missed payments
• Whether repayments fit realistically within the available budget

Interest Rates and Financial Planning

Changes in interest rates can influence both borrowing and saving decisions. For example, a change in the cost of credit may affect loan repayments, while changes in savings rates may affect the return earned on certain financial products.

Interest rates are only one factor in financial decision-making. Personal goals, risk, liquidity needs, taxes, product terms and overall financial circumstances can also matter.

Key Takeaways

• Interest rates can affect both borrowing costs and certain savings returns.
• The total cost of borrowing may include more than the stated interest rate.
• Fixed and variable rates can behave differently over time.
• Compounding can influence how interest accumulates.
• Financial product terms should be reviewed before making decisions.