What is flux analysis?

Definition

Flux analysis is the work of explaining why each account moved compared with the last period. On the books, this is not a new account; it is the story behind the change on a line you already report.

You compare this month to last month, or this year to last year. Then you write down the reason the number moved, in ordinary words a reader can check.

Where it shows up

P&L: Related to explaining why income and expense lines moved versus last period.

Balance Sheet: Related to explaining why account balances moved versus last period.

Cash flow: Related to explaining cash movements versus last period.

See also: Variance Analysis · Month-End Close · Management Reporting Package

When you look at your Income Statement, flux work sits next to the lines, not as a line of its own. Holds-and-chalk expense of $2,400 is the number; the explanation is why it was $800 last month.

The Balance Sheet gets the same treatment. Cash, receivables, and payables all move, and a large jump still needs a reason.

Cash flow reports can be fluxed too. You explain why cash from operations rose or fell versus last period, using the same compare-and-explain habit.

This work usually lands in the close package after the statements are drafted. Owners and lenders read the explanations with the numbers, not instead of them.

How it works

A typical path starts after the adjusted trial balance is in. You line this period up against the prior period for each account that moved enough to care about.

You measure the change in dollars, and often as a percent. A small dollar move on a small account can still be worth a sentence; a $4 change on rent is not.

Then you find the reason. A wall rebuild, a one-time purchase, a missed journal entry, or a real change in volume are different stories.

Write the explanation so someone who was not in the shop can follow it. "Holds and chalk rose $1,600 because we rebuilt the main wall in June" is usable; "expense up" is not.

At month-end close, this review is a check as well as a written explanation. An unexplained jump is often a booking error or a bill in the wrong month.

Stay with period-to-period movement. You are not comparing the books to a plan on this page; you are comparing this period to the last one.

Cover both the Income Statement and the Balance Sheet if the package asks for it. Operating expenses move in plain sight, but prepaid, debt, and inventory jumps need reasons too.

Keep a short file of the explanations with the statements. Next month's reader should be able to see why June was different from May.

Example

A climbing gym spent $800 on holds and chalk in May. In June the same expense is $2,400.

The gym compares the two months and sees a $1,600 increase. The owner already knows the main wall was rebuilt in June, and the extra holds were bought for that job.

The flux note is one sentence the package can carry: holds-and-chalk expense rose from $800 to $2,400 because of the wall rebuild. That is the analysis; the $2,400 on the Income Statement is still just the number.

If the gym cannot name a reason, it looks for a miscoded bill or a double post before it issues the statements. The unexplained jump is a close problem, not a story to invent.

Common mix-ups

Flux analysis is not variance analysis. Flux explains movement versus the prior period; variance explains a gap between two different sets of numbers, often actual versus plan.

Flux analysis is not a budget versus actual report. That report lines the books up against the plan; this work lines this period up against last period.

Flux analysis is not the account balance itself. $2,400 of holds-and-chalk expense is the line; the wall-rebuild explanation is the flux.

Related terms

• Variance Analysis: Investigating and explaining differences between two sets of numbers.
• Month-End Close: The monthly version of the close, ending in issued financial statements.
• Income Statement: A statement showing revenue earned and expenses incurred over a period, ending in net income.
• Budget Versus Actual: The comparison of planned amounts to what actually happened.
• Adjusted Trial Balance: The trial balance after all period-end adjusting entries are posted.
• Materiality: The threshold at which an error or item is big enough to matter to a reader.
• Management Reporting Package: The internal reporting set that pairs financial statements with operating metrics and commentary.
• Month-Over-Month Growth: The change from one month to the next, expressed as a percentage.