Guides · Understanding a month
A total at the end of the month is a post-mortem.
Knowing on the 31st that you spent too much is knowing something you can do nothing about. The useful version of that sentence arrives on the 12th, and it is about one pocket rather than about everything.
The first problem
One number cannot be acted on.
“You spent $3,180 last month” is true and useless. It does not say which part was unusual, so it offers nothing to change. People respond to it by resolving to spend less in general, which is a resolution about everything and therefore about nothing, and which lasts about nine days.
What can be acted on is smaller and more specific: eating out is running at nearly twice its usual pace and the month is only halfway through. That sentence names a thing, names a size, and arrives while there is still half a month to do something about it.
So the work is not adding receipts up. It is getting them into a few honest pockets and then watching the pace of each one.
The second problem
Almost every comparison people make is unfair.
Comparing what you have spent by the 12th against a whole previous month is the most common mistake in personal finance, and it always produces the same comforting, wrong answer: you are doing brilliantly. You are not; you are twelve days in.
The fix is to compare to the same day of the month. What you had spent by the 12th of last month, and the month before that, against what you have spent by the 12th now. That is a comparison between like things and it is the only one worth making.
And the thing to compare against is yourself. An average household is not a useful yardstick: it has a different rent, a different number of people and a different city. Your own last three months already contain all of that.
The third problem
A number without a history should say nothing.
A new pocket, or a first month, has nothing to be compared with. The honest thing to do then is to stay quiet rather than guessing, and a tool that invents a verdict from one month of data will be wrong loudly and then be ignored for ever.
A ceiling is the other way to have an opinion, and it is a better one, because it is a decision you made rather than a prediction anybody inferred. If you have said that groceries are $600, then $600 is the line, and no history is needed.
With neither — no ceiling and no usual — silence is the correct output. This is worth saying because most budgeting tools do the opposite, and the noise is why people stop reading them.
In practice
Four questions, once a month, on a day you choose.
Pick a day — the 12th, the 15th, whatever — and look then rather than at month end, because the whole point is to look while something can still change. Four are enough.
Which pocket is running higher than usual?
Not which is biggest. Rent is always biggest and it is never news. The question is which one is unlike its own recent self.
Is there a reason, and is the reason finished?
A dentist, a flight, a new mattress. A one-off that has already happened needs no action at all; the mistake is reacting to it as though it were a trend.
What is left, and what does that come to a day?
The remaining amount divided by the remaining days is the single most useful figure in household money, because it is the only one shaped like a decision.
Is anything creeping?
The subscription nobody uses, the delivery fee that became normal, the pocket that has grown ten per cent a month for three months without anybody deciding it should. These are invisible in any single month and obvious across three.
Straight answers
Common questions
How many months before this means anything?
Two gives you a hint and three gives you something worth acting on. Before that, a ceiling you set yourself is more honest than any comparison, because there is nothing real to compare against yet.
Should I set a budget for every pocket?
No. Set one where you actually intend to change your behaviour, and leave the rest to be measured against their own usual. A dozen ceilings you did not really mean produce a dozen warnings you will learn to ignore.
What if a month has something unusual in it?
Name it and move on. The purpose of looking is to separate the unusual thing you already know about from the ordinary drift you do not. A month with a new furnace in it is not a month that needs a resolution.
Why compare to myself rather than to an average household?
Because an average household has a different rent, a different city and a different number of people, so the comparison cannot tell you anything about your own choices. Your own last three months already account for all of that.
When in the month should I look?
Somewhere between the 10th and the 15th. Early enough that half the month is still ahead of you, late enough that the numbers mean something. The exact day matters far less than it being the same day each time.
What counts as running high?
Not a small overshoot. A twentieth over your own usual is noise and saying anything about it teaches you to stop listening. The line between “a bit more than usual” and “worth telling you” is a judgement, and it should be yours to move.
Where ExpenseGauge fits
It answers the pace question, not the total question.
ExpenseGauge files every item into a pocket of its own as the receipts arrive, so the month is already broken up before you look at it. Each pocket is then measured against your own previous months, to the same day of the month — never against anybody else’s budget.
The three problems above are the three rules it follows. A ceiling you set is the line if you have set one; your own recent months are the line if you have not; and where there is neither, it says nothing at all. Small overshoots stay quiet, and how small is small is yours to decide.
No password. You sign in with a six-digit code sent to your email. The free plan is not a trial — see pricing.