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How much came in this month, and which month you compare it to, to know if it's good
You'll know which month to compare yours to each time, depending on whether your business is seasonal or not, and you'll be able to say with confidence whether this month was better or worse.
By Yodai · Published September 6, 2026 · Updated October 12, 2026
This month, $3,100 came into the business. Is that good or bad? The number alone doesn't tell you much: it needs something to compare against. That number, total revenue, is the first of four figures worth checking every month.
But here's the decision almost nobody stops to make: do you compare it to last month, or to this same month last year? They're not the same. And if you pick wrong, you end up making decisions based on a number that doesn't say what you think it says: cutting a price, worrying for no reason, or feeling fine when you shouldn't.
Two months to measure yourself against
There are two candidate months for the comparison, and each one tells a different story.
Last month tells you if a recent change is already showing: a new price, different hours, a promotion you launched. The same month last year tells you if you're really improving, once you strip out the ups and downs that just come from the time of year.
- It tells you early whether a recent change is already paying off
- Reacts fast: ideal for seeing the effect of a specific decision
- Gets confused if your business goes up and down just because the season changes
- Compares August with August, not August with July: it strips out vacations, cold weather, and seasonal sales
- Takes a year to give you your first real comparison
- Doesn't tell you anything about the change you just made
Which one to pick: If your business is seasonal, always compare to the same month last year. It's the only way to know if you're truly improving, not just riding the busy season. If your business is steady year-round, compare to last month: it'll warn you sooner if something's going well or not.
Is your business seasonal?
To know which one applies to you, ask yourself one question: if you changed nothing, same price, same hours, same service, would next month go up or down just because the season changes?
If the answer is yes, an outdoor patio in summer, a gym in January, a costume shop in October, you're seasonal: always compare with the same month last year. If the answer is no, a hair salon, a clinic, a neighborhood shop with steady regulars all year, compare with last month: it warns you sooner.
Pick one single reference and stick with it for all twelve months. If one month you compare with the previous one and the next month with last year, you're not comparing anything: you're just picking whichever number suits you that day.
The costly mistake
How to write it down, each month
You don't need software or a complicated spreadsheet. One line each month is enough, with three things: what came in, which month you're comparing it to, and why you're comparing against that one and not another.
- You know whether your business is seasonal, and which month to compare yours to each time
- You've picked a single reference for the next twelve months, not a different one each month
- You know how to write, in one line, the comparison that actually matters
- The next lesson looks at the second number: how much each sale earns you on average