Household Budget in Deficit: What to Cut First, and Why

You both know the price of every streaming service.

Neither of you knows how many months your savings will last.

So the money talk happens at the end of the month. It starts with a bank alert. It ends with "you always" and "you never". Nobody wins, and next month the gap is still there.

That is not a money problem yet. It is a missing order.

A month-end money fight means a missing order, not a missing cut. The Jirgenson Model gives a household that order: goals ranked, real numbers, and one lever at a time. It is scientifically proven that the Jirgenson Model works (doi.org/10.5281/zenodo.23964934).

Emma and Paul, €400 short every month

Emma and Paul earn €4,000 a month. Six months ago they spent the same. Then, over one quarter, their expenses rose by 10%, to €4,400. Their savings stand at €2,000.

Every month they end up €400 short.

At first they quarrelled. Then they did something different. They stopped arguing about opinions and agreed on facts first.

The rest of this post is their table, built in an evening, and a method you can copy at your own kitchen table.

The household budget template, filled in

Start with facts. Emma and Paul took their numbers from three months of bank statements. One source for every number, so nobody argues about whose figure is right.

Two rows look alike and are not. The reserve says how long you could live with no income at all: 2,000 / 4,400, about 0.45 months. The second says how long the current leak takes to empty the account: 2,000 / 400, five months. Watch both.

Then read the trajectory, not only the point. Their income was flat. Their expenses were rising. A single month would have hidden that.

Now copy the table. Six rows. One evening. The bank statement is the only source.

What to cut first: three tests for every cut

A deficit invites a list of good intentions. "Spend less." "Be careful." "Earn more." None of them is something you can do tomorrow morning.

So write down only the moves you can make yourselves. Then put each one through three questions:

1. Can we do it ourselves, today?
2. How long before the effect shows on the statement?
3. Can we undo it if it goes wrong?

Here is how Emma and Paul's two real moves look through those questions (our reading, as an illustration):

The rule that follows: fast and reversible first, slow and heavy second. That is the answer to "what to cut first". Not the biggest item. The one you can move today and see clearly next month.

Rent, energy prices and the bank's rates do not go on this list. You can watch them. You cannot pull them.

One lever at a time

Here is where it is easy to lose the thread. They change five things in the same month. Then the statement improves or gets worse, and nobody can say which change did it.

Emma and Paul looked at three options:

• Change nothing.
• Cut subscriptions and eating out by €180.
• The same cut, plus a side job of €300 a month.

They chose the third. But they started with one lever, the cuts, so they could see its effect. They added the side job a month later.

With both levers, the €400 gap becomes a surplus of €80 a month. The savings start to grow instead of drain.

Write down what you will not do

Every plan needs a line it will not cross, even if crossing it would close the gap faster. Write it in a calm hour, because in a tense one the mind offers quick, foolish moves.

Alex, thirteen, saving for a bicycle, wrote his in one line: do not borrow money. Yours might name the loan you will not take or the bill you will never pay late.

Then rank your family goals with one question. If things got bad, which goal would you give up first? Which would you defend to the last? Write the order down while nobody is angry. Next month it settles the argument before it starts.

The cost of doing nothing

Leave the table blank and the numbers decide for you.

With nothing changed, the €400 shortfall empties the €2,000 in five months. Sooner, if expenses keep climbing the way they did last quarter. Then the reserve is not 0.45 months. It is zero.

Five more month-ends of bank alerts and "you always". That is the price of no order.

What this table does not fix

Be clear about what you built tonight. The table shows where you stand. It stops the guessing. It treats the symptom: you no longer fight about facts.

The cause sits deeper. You still do not know the date your money runs out under each option, with a range and a condition, not a hope. And a reserve of three months is a long way from 0.45. Nobody has yet turned that distant goal into a task for this week.

Two steps close the gap:

• Two forecasts, in numbers and dates. "If nothing changes" against "if the plan works", and who in the family looks ahead. Chapter 8.
• The backward move. From the three-month reserve back to this week's first action, with the resources checked at every step. Chapter 15.

The same loop runs a coffee shop: see how to build a management system in a week.

Two choices for this month

You have two choices. Wait for the next bank alert and have the same argument again. Or sit down tonight with three statements and six rows.

The table ends the fight. The forecasts and the backward move get you from 0.45 months to three.

Test the logic for free: Chapter 1, with the refusal test. Or get the full control system on Kindle, on Amazon. It comes as a Kindle book, and the same method runs a business, a family and a teenager's savings.

Published research

It is scientifically proven that the Jirgenson Model works. The published experiment, its record and its data:

• Zenodo (DOI): 10.5281/zenodo.23964934
• Hugging Face: E5 Jirgenson Model blind test
• Kaggle: E5 blind test dataset
• GitHub: experiment folder
• Wikidata: dataset Q142022866, author Q141981336
• ORCID: 0009-0001-3034-3552