Interest rates

💰 Personal Finance · 3 min read · Last reviewed 2026-10-02 · By the AlfaFinances editorial team

An interest rate is the cost of borrowing money, or the reward for lending/saving it, expressed as a percentage. When you borrow (a loan, a credit card balance), you pay interest to the lender. When you save or invest in interest-bearing accounts or bonds, you receive interest. Central banks (like the Federal Reserve or Bank of England) also set benchmark rates that ripple through the whole economy, affecting mortgage rates, savings rates, and even stock market behavior.

A worked example

When a central bank raises its benchmark interest rate, borrowing generally becomes more expensive across the economy (higher mortgage rates, higher credit card APRs), while saving generally becomes more rewarding (higher savings account and bond yields), this is one reason interest rate announcements are closely watched and can move markets.

Key takeaways

Interest is the cost of borrowing and the reward for lending or saving.
Central bank rate decisions ripple through mortgages, savings accounts, credit cards, and markets broadly.
Rising rates generally make borrowing more expensive and saving more rewarding, and vice versa.

Common mistakes

Ignoring how central bank rate changes might affect existing variable-rate debt (like some mortgages or credit cards).
Not shopping around for better savings rates when rates rise, leaving money in a low-yield account.
Assuming interest rates only matter for economists, not personal finances.

Test yourself

1. What is an interest rate?

A tax on income
The cost of borrowing money, or the reward for lending/saving it
A type of stock
A government subsidy

Answer: The cost of borrowing money, or the reward for lending/saving it. Interest rates represent the cost of borrowing or the return earned on lending/saving, as a percentage.

2. What typically happens to borrowing costs when a central bank raises its benchmark rate?

Borrowing becomes cheaper
Borrowing generally becomes more expensive across the economy
Nothing changes
Only stock prices change

Answer: Borrowing generally becomes more expensive across the economy. Higher central bank rates typically ripple into higher rates on mortgages, credit cards, and other borrowing.

3. What generally happens to savings account yields when rates rise?

They generally become more rewarding too
They always fall
They become illegal
Nothing happens

Answer: They generally become more rewarding too. Rising benchmark rates often lead to better yields on savings accounts and bonds as well.

Take this lesson interactively All lessons

The interactive version tracks your progress, scores the quiz and includes the AI tutor.

Keep learning

← InflationPrevious lesson Financial goals →Next lesson BudgetingPersonal Finance Emergency fundsPersonal Finance Saving strategiesPersonal Finance Debt managementPersonal Finance

Sources and further reading

Educational information only, not financial advice. AlfaFinances does not execute trades, hold your money or recommend that you buy or sell any security. Prices and company data come from public sources and may be delayed or inaccurate. Past performance does not indicate future results, and investing involves risk, including loss of principal. See our editorial policy and privacy policy. Last updated: 2026-10-02.