Earning well and saving nothing? What counts is the gap, not the income

Two budgets written out line by line: 4,800 a month with nothing left, and 2,300 a month that puts aside 400. Exactly where the difference disappears.

"What do you earn" tells you surprisingly little about what you have. That is decided by the gap between what comes in and what goes out — and the gap can be negative on a high salary and positive on a modest one.

This is not a lecture about thrift. It is arithmetic that is easy to miss, because costs rise along with income and that rise is almost invisible from one month to the next.

Below are two budgets written out. The figures are illustrative, but the proportions are taken from how these budgets usually look.

Mark: 4,800 a month, big city

Senior role at a large company, a mortgage, a car on finance. Asked about savings, he says "somehow nothing is left".

That fifty is fiction, though. Mark does not record everything — small purchases, presents, pharmacy, taxis, one-off fees. For most people unrecorded spending is 5–8% of income, which here is 240 to 380.

So in reality Mark comes out a couple of hundred short every month. He covers it with a quarterly bonus, a credit card, or by buying fewer clothes one month. His account never reaches zero, so nothing signals a problem.

Anna: 2,300 a month, smaller town

Specialist at a services firm, renting, no car. She has been putting money aside every month for two years.

Anna saves 19% of her income. Mark saves less than nothing.

Where the difference actually goes

Mark earns 2.1 times more. If his costs scaled with his income, he would have over 900 left. He does not. There are four reasons and all of them are countable.

Fixed costs grew faster than income. Housing and the car cost Mark 2,400 — half his income. For Anna they are 895, or 39%. Every pay rise went into a bigger flat and a better car, and those decisions cannot be reversed month to month. You cannot decide in March to pay a smaller mortgage.

Eating out is not food. Their grocery bills are comparable once you allow for prices and household size. But Mark spends another 560 on eating out — a single line roughly the size of a third of Anna's entire budget.

Annual costs are not averaged. Anna sets aside 165 a month for things that come once a year: insurance, holidays, Christmas, replacing equipment. Mark pays those out of the current month when they land — and then that month is "unusual". He has eight unusual months a year.

Unrecorded spending grows with income. On a modest salary small purchases are small. On a high one "small" means something else, and the amount at which a person stops thinking about it moves from five to fifty.

What this actually means

Your savings rate matters more than your income. Anna saving 19% of 2,300 puts away 5,300 a year. Mark saving zero of 4,800 puts away zero, however good his salary sounds.

More than that, the savings rate cuts both ways. Anna needs 1,855 a month to live. Mark needs 4,800. If either loses their job, the same amount of savings lasts Anna far longer — because what decides how many months you survive is not the amount but the amount divided by your monthly cost of living.

What this article does not say

It does not say that low earnings are a matter of discipline. Below a certain threshold budgeting does not help, because fixed costs consume everything and there is nothing to optimise. The Anna in this example earns above that threshold — on 1,300 with the same rent, no spreadsheet would fix it.

Nor does it say Mark is doing something wrong. Eating out and a good car are choices, not errors. The error is not knowing you made them — which is exactly what happens when costs creep up by a few hundred a year alongside pay rises.

How to find out which side you are on

Not by guessing. Three numbers are needed and all of them take one month of recording.

What actually comes in. Not the figure on the contract, but the sum of what landed in your account. With bonuses and side work it can differ by ten percent or more.

What your fixed costs are. Mortgage, rent, utilities, insurance, subscriptions, car finance — everything that goes out next month regardless of any decision you make. Almost nobody knows this number from memory, and recurring costs totals it by definition.

What disappears without a trace. The difference between the change in your account balance and the sum of the transactions you recorded. The accounts module shows it outright rather than letting it quietly vanish — and for most people it is the most surprising of the three.

Only with those three can you change anything. The first month is a measurement, not an exam — and without the measurement every decision about saving is a guess about what to save on.

How to turn this into an actual plan is covered in financial goals that stick.