Loans and Savings

See also: Budgeting

Our page on Understanding Interest explains the basics about how to calculate interest, especially compound interest.

This page puts that into a bit more context, explaining the link between savings and loans, and how banks use money.

It also explains some of the principles behind banking, such as why loans will cost more if you will find it harder to repay the money.


If you put your money in a savings account, it doesn’t just sit in your account doing nothing.

The bank is able to use it to lend to other people, and to invest in businesses. Astonishingly, a bank can actually lend your money about ten times over. This means that each £1 deposited with a bank is worth about £10 in loans.

A Run on the Bank

If a bank gets into financial trouble, savers may try to withdraw their savings. This can lead to a ‘run’ on the bank, which is what was seen during the global banking crisis of 2007–8. Savers at the Washington Mutual in the US and Northern Rock in the UK all tried to withdraw their money at once.

We said above that banks lend out the money about ten times over. At any given time, therefore, the bank is unlikely to have enough cash to pay back every saver. A run on the bank can therefore be a disaster, leading to the bank going bust.

Because banks can lend your savings to other people, they are able to earn money on them. This means that they can give you money as a reward for giving them the use of your money. This is the interest.

The interest rate paid depends on what banks think they can earn on the money. So, for example, if you are prepared to promise to leave your money with the bank for several years (a fixed term savings account), then you will get a better rate of interest than if you want instant access to your money. The longer the fixed term, the better the interest rate.

The interest on savings accounts is usually paid either monthly or yearly. In the UK, banks are obliged to quote both the rate and period at which the money is added, and also an annual equivalent rate, or AER, for monthly savings accounts. This is to allow easy comparisons between two accounts offering different interest periods.

Net and gross interest

Depending on your total earnings and income from other sources, you may be required to pay income tax on your savings interest. Your bank will provide an interest statement for your savings account, usually at the end of each interest period or financial year.

You may see both net and gross interest quoted on your statement. Gross interest is the total amount of interest earned for the period, and the net amount is what you receive after you have paid any tax due.

Banks are Businesses

Banks need to make a profit, like any other business. People sometimes make the mistake of thinking that their bank wants the best for their customers. As a general rule, they don’t. They want the best for their shareholders, which may involve paying customers less than customers would like.

It is therefore worth keeping an eye out for:

  • Bank accounts which only pay interest if you leave the money there for a full term, usually a year, and may pay no interest if you withdraw the money even one day early;
  • Bank accounts which pay their best rate of interest if you keep a certain amount in the account, often £5,000 or £10,000, with the rate for sums below that being negligible;
  • Bank accounts whose interest rate drops dramatically after a fixed period, again often a year; and
  • Bank accounts which pay an ‘introductory bonus’ for a period, after which the interest rate drops severely.

If you find that you have a savings account which is not working for you, it’s best to change to a different one, whether with the same provider or another. You can find tables of ‘best buys’ on various websites and in the press to enable you to compare.

Borrowing Money

The other side of the coin, and the way that banks use the money from savers, is to provide loans to individuals and businesses.

There are a number of different types of loans and also of loan providers. However, what they all have in common is that you are almost invariably charged, often heavily, for the use of the money.

The exact interest rate depends on the size of the loan, the repayment period, and also the security of the loan. Security means how likely you are to pay back the money, and/or how easily the bank can recover its losses if you can't.

Secured and Unsecured Loans

Secured loans are those which are guaranteed in some way.

Secured loans include mortgages, which are usually very long term (15 to 25 years), and where you guarantee the loan against the property. If you default on the loan, the mortgage provider can force the sale of the property to recover their money.

Other secured loans include ones that are personally guaranteed, where someone agrees to repay the loan if you default. In general, lenders use secured loans for large sums of money, or ones that are a bad risk, that is, where they think they may struggle to get the loan repaid.


It is a very bad principle to agree to guarantee anyone else’s loan, whether an individual or a business, because it can lead to you losing your home and/or all your money.

Think very carefully before you agree to anything that requires you to act as a ‘personal guarantor’.

Unsecured loans include standard bank loans, loans from so-called ‘pay-day’ lenders, and loans from dedicated loan companies.


In general, the more you need to borrow money and the harder you will find it to pay back the loan, the higher the interest rate.

This is because lenders are trying to protect themselves against the risk that you will default by charging a high interest rate, so that they make a return on the money.

While borrowing money is sometimes unavoidable, it is wise to be certain that you will be able to pay it back once the loan falls due. Otherwise, the interest rate is likely to be punitive in the extreme, and you may find that you owe many times the original amount of the loan in a fairly short space of time.

Credit cards: an expensive way to borrow money

You can consider credit cards as a way to borrow money. They effectively act as a short-term loan.

When you spend using a credit card, the credit company (your card provider) pays and then charges you later. There is a grace period, usually up to one month, until you receive a bill, during which you are charged no interest. You then have a certain length of time until you have to pay the bill to avoid incurring interest charges.


Credit cards are fine if you pay them off in full each month. Then there is no cost to borrowing.

However, if you don’t pay them off in full, the interest rates tend to be high, often as much as 15% or 20% of the value of the loan. And because this is compound interest, it quickly mounts up into serious sums of money.

See our page, Understanding Interest for examples of how compound interest works.

Credit cards, like other short-term loans that are not repaid quickly, are therefore an expensive way to borrow money, and should not be considered a long-term financing option.

Point of Sale Credit – Buy Now Pay Later

More recently, there is a trend towards online and high street retailers offering customers the option to pay back their purchases in instalments, to spread the cost. Providers of these services work with retailers and describe themselves as ‘like a credit card but without the plastic’.

From the customer’s point of view, you simply spend an amount up to a specified credit limit and select the credit provider as your chosen way to pay at the checkout (or via the provider’s app). The credit provider then gives you a period of time to pay them back without incurring any interest, so you can ‘try before you buy’. Alternatively, you can split your payment into a number of monthly instalments to help you spread the cost via a financing service.

Does this sound too good to be true? Well, there is no such thing as a free lunch.

If you choose a financing option, you will be subject to interest charges similar to other credit providers, which may be up to around 20%.

Similarly, if you miss a payment, hefty interest rates apply. That pair of designer jeans will end up costing you substantially more than you first thought.

You will also need to meet certain eligibility criteria or you could be declined.

And as with all credit services, you run the risk of damaging your credit rating and running into debt if you are unable to repay what you have borrowed.

For more about this see our guest page on Understanding Debt.

Understanding Credit Limits

Whenever you take out a loan, you will be given a ‘credit limit’. For a mortgage, this is the maximum amount you can borrow, given your likely ability to repay the loan and pay the interest each month, and also the value of the property. For a credit card, this is the maximum amount of credit you can draw on.

A credit limit applies overall, rather than in a period.

Suppose that your credit limit on your credit card is £3,000. You would be able to borrow £3,000 in total. If you paid it back each month, you could then borrow £3,000 each month. However, if you only pay £1,500 back in the first month, you will incur interest on the rest. If that is calculated at 2% per month, your new debt will be £1,530. You will therefore only be able to borrow up to £1,470 the next month.

Why You Might Use Debt

It is important to understand that, like most financial concepts, debt is not intrinsically ‘good’ or ‘bad’.

We generally use loans to buy things that we would not otherwise be able to afford. Sometimes this is good, and sometimes it is less ideal.

  • If you take out a loan purely to fund a lifestyle, for example, to go on holiday, this is not a good use of debt. You will end up paying far more for the holiday than it is worth.

  • However, sometimes using debt gives us an asset that will appreciate in value. An example is a house bought with a mortgage. In this case, the value of the asset is likely to rise. You will therefore be able to offset the costs associated with the debt against the profit you make on the value of the house. This is known as ‘leveraging’.

It does not always follow that buying a ‘thing’ will give you an asset that will appreciate. A car, for example, will depreciate rapidly. You will therefore end up paying considerably more than the car is worth. This is why many financial advisers suggest that if you can afford it, it is best to buy a car outright rather than using a loan.

It is reasonable to use a loan to buy something that will result in a return on your investment, such as property. However, you always need to balance the potential return against the risk of the investment. It is not wise to use debt to purchase very risky investments. In this case, you could lose all the money—but still have to pay it back.

Refinancing loans: a special case for using debt

There is one special case for using debt: refinancing loans. This is where you take out a loan to pay off a previous loan or loans.

This might be for two main reasons.

  1. To consolidate your debts

    For example, you may have incurred credit card debts, and are finding it hard to pay them off quickly enough to avoid heavy interest rate penalties. In this case, you may be able to get a new personal loan at a lower rate of interest. You could use that money to pay off the credit cards, and repay the personal loan in due course.

  2. To get a better rate of interest on a single debt

    This is the principle behind refinancing your mortgage periodically. When you move from the early preferential rate on your mortgage, onto the lender’s standard variable rate, it may be a good idea to take out a new mortgage, either with your existing lender, or a new lender. This will give you a better rate of interest, and lower the overall cost of your loan.

There is more about this in our page on Understanding Mortgages.

Further Reading from Skills You Need

The Skills You Need Guide to Numeracy

The Skills You Need Guide to Numeracy

Skills You Need

This four-part guide takes you through the basics of numeracy from arithmetic to algebra, with stops in between at fractions, decimals, geometry and statistics.

Whether you want to brush up on your basics, or help your children with their learning, this is the book for you.


There may well be times when you can afford to save, and times when you need to borrow money.

This page should help you understand the options available to you and, with our page on Understanding Interest, help you to compare like with like. It may also help you to see why advice from banks and other lenders is not necessarily always in your best interests.