What it means
A forecast that is written once and filed away has almost no value. Monitoring is the activity that gives it teeth: comparing what actually landed in the bank against what was predicted, explaining the difference and adjusting the forward view.
It matters because cash problems build gradually and then arrive suddenly. A collection cycle that slips by four days each month looks trivial in isolation, but monitoring catches the pattern in month two rather than in the month the overdraft limit is reached.
In practice most businesses run a rolling 13-week model, updated weekly with actual bank movements and re-forecast for the remaining weeks. Larger organisations supplement this with daily bank position reporting, and smaller ones may work monthly, but the principle is identical: actual against forecast, difference explained.
Variance analysis should distinguish timing differences from permanent ones. A customer who pays four days late creates a timing variance that reverses next week, while a customer who disputes an invoice creates a permanent variance that will never reverse, and treating the two the same way produces bad decisions.
The habit that separates good monitoring from box-ticking is tracking forecast accuracy over time. Recording the percentage variance each period reveals systematic bias, and most businesses discover they consistently overestimate receipts and underestimate payments by a predictable margin they can then correct for.
In practice
Real-world examples.
Example
A veterinary group reviews its cash position every Monday morning against the 13-week forecast and notices insurance reimbursements slipping from 21 to 34 days. The practice manager escalates with the insurer before the delay reaches $200,000.
Example
A construction firm tracks monthly variance and finds it has overestimated receipts in eleven of the last twelve months by an average of 8%. It applies a standing 8% haircut to forecast receipts, and accuracy improves immediately.
Example
A fashion retailer monitors daily bank balances through the run-up to Christmas because stock payments and takings both spike. The daily view lets the finance director release a supplier payment run two days early without risking the balance.
Think of it
“Cash flow monitoring is keeping watch on your cash-tracking actual versus expected continuously.
Formula
Calculation
Cash Flow Variance = Actual Net Cash Flow - Forecast Net Cash Flow
Variance Percentage = Cash Flow Variance / Forecast Net Cash Flow
A print business forecast net cash flow of $120,000 for the month. Actual receipts came in at $840,000 against a forecast of $900,000, while payments were $762,000 against a forecast of $780,000.
Actual Net Cash Flow = $840,000 - $762,000 = $78,000
Cash Flow Variance = $78,000 - $120,000 = -$42,000
Variance Percentage = -$42,000 / $120,000 = -35%
Investigation showed $50,000 of the receipts shortfall was a single customer paying five days after month end, a timing variance that reversed the following week, while $10,000 related to a disputed job that was eventually written off. The remaining $18,000 favourable movement came from payments running lower than forecast because a planned equipment deposit slipped into the next month.
Splitting the variance this way changes the response. Only the $10,000 dispute is a permanent loss requiring a forecast adjustment, while the other $50,000 simply moves into the following period and the $18,000 payment saving reverses in the same way.Case study
Seen in the real world.
This illustrative and fictional case concerns Ashcombe Signage, an invented commercial signage installer with 40 staff. The company produced an annual cash forecast each January and did not look at it again until the following year.
After an unexpected overdraft breach, the finance manager introduced a weekly 13-week rolling review taking about 90 minutes each Monday. Within six weeks the review revealed that a single national retail client, worth 30% of revenue, was paying at an average of 74 days against agreed terms of 45, and that this alone explained most of the cash pressure.
Armed with the evidence, the directors renegotiated to 45-day terms with a 2% late-payment charge and put a stop on new work while invoices were more than 60 days overdue. The rolling review also gave them six weeks of warning before the next seasonal low point, which they covered by deferring a van purchase rather than by borrowing.
Watch out
Common mistakes.
- Monitoring the closing bank balance only, without comparing the underlying receipts and payments that produced it.
- Explaining a variance as bad luck rather than separating genuine timing slippage from permanent losses such as disputes or bad debts.
- Updating the actuals but never re-forecasting the remaining weeks, which leaves the forward view stale and misleading.
Questions
People also ask.
How often should cash flow be monitored?
Weekly is the practical standard for most businesses, with daily bank position checks where balances are tight or volumes are high.
Who should own cash flow monitoring?
Ownership usually sits with the finance manager or controller, but the review needs a director present so that decisions can be made in the meeting.
What variance level should trigger action?
Many businesses set a threshold of around 10% of forecast net cash flow, or any variance that takes the projected low point below the minimum cash buffer.
From the founder's library
Take it further with the book.
Build your financial confidence beyond this definition. Shihan's full-length guide, Accounting Fundamentals, takes the same plain-English approach and turns it into a complete, practical playbook for non-finance managers, business owners and students - with chapter-end quiz answers and presentation slides included.
25% off with code MMHQ25, applied at checkout. Priced in USD - checkout may show the equivalent in your local currency.
View the book and save 25%