It is essential that you get in control of your finances from an early stagebut does that mean not having any debt? When is it right to take out a new loan?

Quite often when I speak to people in debt I find that they didn't know what they should or shouldn't borrow money for. They could benefit from this simple but very powerful rule for their personal finances. It allows them to plan, feel in control and not resent their debts. Quite often it is the feeling of not being in control that gets people down.

This nice simple rule has worked for me for years and helps to decide what you can and cannot afford, when it is right to borrow and when it is not.

It draws from my economics background and my professional accountancy trainingbut despite that it's very simple!

Accountants talk about things such as 'amortisation' and 'useful economic lives'. This means that if you buy an asset such as a building or piece of equipment the cost gets spread over several yearsover its 'useful economic life'.

Economists have a different language (you may have noticed!) and they talk about 'utility'ie the satisfaction you get from consuming a particular product or service.

But what has this got to do with debts and loans?

Well my simple rule comes from both of these concepts combined.

The result is what I call the rule of 'Benefit-Justified Borrowing'!

Of course being an economist at heart, I shorten this to the 'BJB' rule.

So what does it mean? Quite simply this: only borrow money to fund something that will continue to give you some satisfaction or benefit over the life of the loan that is funding it.

In other words borrowing should only be justified by the benefits that will flow to you in the future from what you have purchased.

Think of it like thisyou are buying a reservoir of satisfaction, benefit or enjoyment that will last for several years and this is the reason that you can justify a loan to fund it. To the economist you are deferring your consumption and you are deferring the funding of it. A perfect match!

That's all a bit abstract - so let's look at some examples:

Buying a houseit's unlikely that you can pay cash for it - so you have a mortgage. This fits the BJB rule because you will derive benefit from living in the house over the life of the debt.

Furniturelet's say that a piece of furniture will last you for 10 years and you fund it by a loan. Again this fits the BJB rule very well. The next question is how long the loan term should be. You could choose to have a loan over any period up to 10 years, although in reality you would probably want it to be less than 10 yearsas it would be sensible to take into account what the furniture might be worth in the future. If it was likely to be worth nothing after 5 years then this would be the sensible maximum term of the loan.

Vacationsthis is a great example. Many people go on vacation and thoroughly enjoy it but then have expensive credit card debts for months afterwards. This is where the resentment can kick inyou get to a point where you are desperate for the next vacation but can't afford it as you are still paying off the last one! This is depressing - and cancels out the original enjoyment!

If you follow my BJB rule you will never fund a vacation with debt because when you are paying off the debt you are no longer getting any satisfaction or benefit from the purchase you have madethe vacation is over.

This is where good old-fashioned discipline comes insave up first for things that do not have a future benefit.

Imagine you have followed the BJB rule. You are going on vacation, knowing that it is all paid for, with cash in your pocket in accordance with the budget you have set. You can go away with a clear conscience to enjoy a relaxing breakand then when you come back there is no debt hanging over you to pay off!

The last example is your usual day to day living costs. You will hopefully realise that this would not meet the BJB rule! It should never be funded by debt. If you are building up long term debt to fund your day to day food and living costs then you urgently need to address this issue and should seek some help and advice without delay.

So does this rule mean never use a credit card? Not at allshort-term loans can have their place - but it does mean only use it when you understand how you will pay off the debt.

So like all good rules the BJB rule has this one exception. Occasionally it is necessary to use short-term debt such as a credit card to get over temporary and short-term cash-flow difficulties. Life rarely goes according to plan and you may just be a month away from having completed your savings plan.

A good example is back to the vacation - clearly it would be ridiculous to cancel it because you were short of savings by one month! Using a credit card means that you don't have to have saved up every last penny before packing your cases.

However using a credit card should be in the context of a solid plan to pay off your debt within a couple of months of your vacation. You have already mentally spent that money for the next month or two.

Clearly this exception to the rule is about a small shift in timing and is quite different from building up medium to long-term debt that is not benefit-justified!

So from now on follow the 'Harper BJB rule' and match the debt to your enjoyment and you shouldn't resent a debt again!

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