How Interest Rates Affect the Stock Market

Roberto Rivero

Roberto Rivero

Oct 03, 2022

8 min read

Oct 03, 2022

8 min read

If you have been paying attention to the news in recent weeks you will have no doubt read about the prospect of interest rate rises this year. But what does this mean for investors? How do interest rates affect the stock market? Is there any correlation between rising interest rates and stock prices?

In this article, we will answer these questions and explain in depth how interest rates affect the stock market.

How interest rates affect the stock market

What Is the Base Rate?

Interest rates play an important role in our everyday lives. Whether it’s interest we earn on our savings or interest paid on our credit card bill, interest rates directly impact our bottom line.

Whilst all the interest rates we encounter in our day to day life may be different, they all take their cue from the base rate.

The base rate is set by a nation’s central bank. In the UK, this is the Bank of England. In the US, it’s the Federal Reserve. And the European Central Bank is responsible for setting the base rate for the entire eurozone.

The base rate is the rate of interest that a central bank pays institutions, such as other banks, for storing money with them and they charge the same rate of interest when these institutions borrow money. Therefore, the base rate directly influences the interest rate which other banks pass on to their customers.

Why Does it Change?

The base rate of interest is the most powerful tool a central bank has at its disposal for managing the economy and is an effective way for them to control inflation and economic growth.

To put it in its simplest terms, when interest rates are low, as they have been for some time, people and businesses have greater incentive to spend and invest. This increase in consumption and investment promotes economic growth, but also has the effect of increasing prices if supply struggles to keep up with increasing demand (a situation we currently find ourselves in).

On the other hand, when interest rates are higher people and businesses spend and invest less as the cost of borrowing increases and there is a greater incentive to keep money in the bank earning higher interest. This decrease in spending helps push prices down and also slows economic growth.

So, how do interest rates affect the stock market?

Bank of England
The Bank of England sets the base rate for the United Kingdom

How Interest Rates Affect the Stock Market

Generally speaking, interest rates and stocks have an inverse relationship.

However, it is not quite so straightforward. Rising interest rates do not automatically push stock prices down just as lower interest rates do not automatically cause share prices to move higher. There are several steps in between, which play an important part in how interest rates affect the stock market.

Rising Interest Rates and Stocks

Now that we know what interest rates are, why they are changed and, generally speaking, how interest rates affect the stock market – let’s look more closely at the relationship between rising interest rates and stocks.

Rising interest rates increase the cost of borrowing for both people and businesses and this has four key knock-on consequences:

  1. Increased operating costs for businesses
  2. Less investment in future growth
  3. Less incentive for consumers to borrow
  4. Less discretionary income for consumers

Increased Operating Costs and Less Investment

We can split the four above consequences into two sections, the first of which is how rising interest rates directly affect businesses and, therefore, share prices.

Rising interest rates not only means that the cost of borrowing increases, but that the cost of servicing existing debt also increases. Pretty much all businesses have some level of debt, meaning that once interest rates rise, their operating costs will also rise, reducing their profitability.

Less profitability means less money to invest in future growth. Moreover, as the cost of borrowing has increased, businesses will be less inclined to further indebt themselves to invest in future growth.

When companies cut back on future growth and their profit falls, their estimated future cash flow will also fall. All else being equal, this will result in share price falling as the company becomes less attractive to both existing and prospective investors.

Less Incentive to Borrow and Less Disposable Income

Rising interest rates don’t just affect companies directly, but also indirectly through a change in consumer behaviour. In essence, these second two consequences are the same as the first two, the difference is that this time, it is happening to the consumer.

An increase in the cost of borrowing reduces the incentive for consumers to borrow money to fund big ticket items, such as houses, electrical appliances or furniture. Moreover, existing debt, such as a mortgage, becomes more expensive to service, reducing the amount of income a consumer has after taxes and other necessities are deducted, also known as discretionary income.

Both of these factors lead to a reduction in overall consumption, but who suffers from the fall in consumption? Businesses. A fall in consumption can also be viewed as a fall in sales for businesses, which results in less profitability, which leads to less investment for future growth.

Therefore, the indirect result to businesses has the same effect as the direct result, less profit and a reduction in future growth, meaning that estimated future cash flow will also be less. All things being equal, this will tend to cause share price to fall.

Federal Reserve
The Federal Reserve sets the base rate for the United States

Lower Interest Rates and Stocks

So, how about lower interest rates? How do they affect the stock market? Essentially, predictably, in the opposite way to higher interest rates. Lower interest rates decrease the cost of borrowing, which will have the opposite consequences to above.

Businesses operating costs will be lower, and they will tend to invest more in future growth for the company. Similarly, consumers will have more discretionary income which will lead to an increase in consumption.

The result is that lower interest rates tend to cause share prices to increase. Interest rates, which have been held at record lows since the financial crisis in 2008, have played their part in the global stock market hitting record highs in recent years.

Tech Stocks and Interest Rates

Amidst the rumours at the beginning of 2022 that the Federal Reserve was considering hiking interest rates, you may have noticed that amongst the worst casualties in the stock market were tech stocks. Is there a particular relationship between tech stocks and interest rates? Are tech stocks particularly sensitive to rate changes?

When picking investments, the standard practice among professional investors is to “discount” future profits. This is done to simulate the fact that a dollar today is considered more valuable than a dollar in the future.

In the calculations used for discounting future profits, the interest rate plays an important role. The higher the interest rate, the less valuable future profits are deemed to be. As tech stocks often have low, and sometimes no, profits today and huge potential profits in the future, rate rises tend to have a bigger impact on them than other groups of stocks.

Interest Rates and Bank Stocks

Of course, as with most rules, there are always exceptions and when it comes to how interest rates affect the stock market – banks and insurance firms are a couple of the exceptions.

Bank stocks tend to perform well when interest rates are high because they can charge their clients more to borrow money. Furthermore, the increased incentive to save means that bank deposits tend to increase when interest rates are higher.

As for insurance firms, due to the nature of their business, they are obliged to hold a large amount of safe debt in order to back their policies and when interest rates are higher, this safe debt generates more income.

Final Thoughts

Hopefully you should now have a better idea of how interest rates affect the stock market and why investors have been paying so much attention to them recently.

Whilst the relationship between interest rates and stocks is far from straightforward, they tend to move inversely, with bank and insurance stocks being the main exceptions to this general rule.

Roberto Rivero
Roberto Rivero
Financial Writer, Admirals, London

Roberto spent 11 years designing trading and decision-making systems for traders and fund managers and a further 13 years at S&P, working with professional investors. He has a BSc in Economics and an MBA and has been an active investor since the mid-1990s

Meet on