Parkinson’s Law: why you spend everything you earn

You finally got a raise. You’ve been asking for it for months or even years, and at least in that sense, it worked. For the first few days, the feeling is relief. You probably think that with this extra money you’ll be able to save and breathe a little easier at the end of the month.

But a few weeks go by and something curious happens. You don’t see that money. You’re not quite sure what you spent it on, but it’s gone. And you’re still reaching the end of the month with the same feeling of being stretched thin as before.

It’s not bad luck. It’s not that you’re especially bad at managing your money. It’s something that happens to almost everyone, and it’s had a name for more than seventy years: Parkinson’s Law.

What is Parkinson’s Law?

The first time this was discussed was in 1955. Cyril Northcote Parkinson, a British historian and writer, published a satirical essay in The Economist. In it, he described an observation that anyone who has worked in an office would instantly recognize: work has a natural tendency to expand to fill all the time available for its completion.

To understand it better, if you’re given a week to do something you could finish in two days, you’ll end up taking the whole week. Not because you need that time, but because the available time becomes the time you use.

At first glance, this doesn’t seem related to personal finance, but Parkinson didn’t stop there. Five years later, in his book “The Law and the Profits”, he added a second equally revealing law: expenses rise to meet all available income. In other words, no matter how much you earn, you will always find a way to spend it all.

How this works with your money

To apply these ideas to your current situation, think about your own case for a moment. When you earned €1,200 per month, you managed to spend €1,200. If your salary increased to €1,800, now you spend €1,800. If it went up again, you would probably end up spending that new amount without even noticing.

It’s not that your needs have changed proportionally. What changes is your definition of what feels normal. That restaurant you used to visit once a month as a treat becomes a weekly habit. The phone that used to last three years now gets replaced every two because “you can afford it.” Clothes you only bought on sale are now bought at full price. Every increase in income generates an increase in spending that absorbs it entirely.

The role of status in this mechanism

As expected, society also plays a significant role in these expenses. Part of this increase in spending does not respond to real needs. It responds to a feeling of “I should live like someone who earns this much.” A newer car, more expensive vacations, a different neighborhood, or better restaurants.

Status-driven spending doesn’t appear in your mind as a luxury. It shows up as something you “can now afford.” Something you’ve earned. The problem is that every new thing you “can now afford” is one more thing bringing you closer to your income limit. And when the next raise comes, the process repeats.

Signs it’s already happening to you

If you suspect Parkinson’s Law is affecting your finances, there are several signs that can confirm it:

• You have no savings despite receiving one or more salary increases in recent years.

• Halfway through the month, you’re not sure where your money went.

• You feel like you lived the same on your previous salary, just with more pressure.

• You need your next paycheck to cover expenses you didn’t have two years ago.

None of these signs is dramatic on its own. But together, they paint a very clear pattern. It’s worth waking up and getting out of that cycle.

What you can do to break the pattern

The good news is that Parkinson’s Law is not a life sentence. It’s a pattern you can identify and break once you’re aware of it.

Some strategies that work:

• Set money aside before spending it. If your salary increases by €200, separate at least half before it blends into your general spending. Ideally, automate it: schedule a recurring transfer to a separate account on payday.

• Review the expenses you’ve added. Make a list of all recurring expenses you’ve taken on in the past two years and ask yourself which ones existed before your last income increase.

• Set limits on specific categories. Entertainment, clothing, eating out. It’s not about cutting everything off, but about setting boundaries that don’t automatically rise every time you earn more.

Parkinson’s Law doesn’t disappear with more money

There’s something important to understand: the pattern is the same whether you earn €1,500 or €5,000. There are people with high salaries who still struggle at the end of the month, just like those who earn half as much, and they don’t achieve financial freedom either.

The problem has never been how much you earn. It’s the relationship between what comes in and what goes out. As long as that relationship is one-to-one, it doesn’t matter how much your salary increases.

The next time you get a raise, pay attention to the new expenses that appear in the following weeks. That will tell you whether the law is already at work in your finances. And if the answer is yes, you already know what to do.

A simple trick is to set aside part of your money in a separate account, one you don’t check daily and that isn’t linked to your main spending account. Something like a prepaid card can help you save a percentage of your salary as if it weren’t there.

FAQ – Parkinson’s Law: why you spend everything you earn

What exactly is Parkinson’s Law applied to money?
It’s the idea that “expenses rise to meet all available income.” In other words, as your salary increases, your spending expands to fill that new space, much like work expands to fill the available time.

Does this mean I’m bad at managing money if this happens to me?
Not necessarily. Parkinson’s Law describes a very common, almost automatic pattern. It’s not about bad intentions or being “irresponsible,” but about not setting conscious limits when income increases.

What can I do to break this spending pattern?
Three key ideas: (1) set aside part of every raise as soon as you get paid (ideally automatically), (2) review all recurring expenses added in recent years and decide which ones are unnecessary, and (3) set clear limits on categories like entertainment, clothing, or eating out so they don’t grow without control.

How does setting money aside “before seeing it” help?
If you automatically move part of your salary (or each raise) to another account or a prepaid card, that money no longer mixes with your daily spending. Psychologically, it’s as if it doesn’t exist, reducing the temptation to spend it just because it’s available.

Does Parkinson’s Law disappear if I earn a lot of money?
No. The pattern can repeat whether you earn €1,500 or €5,000 per month. There are people with high salaries who struggle just as much as those who earn half. As long as your expenses grow at the same pace as your income, the problem remains.