The month you can see the end is the month you pay for all of it
For twenty-two weeks this job has made money. We measured its cost, protected its margin, managed its cash, and at every step there was a profit at the end to protect.
This week, the job turns. And what happens to the numbers when a project starts heading for a loss is the hardest, most honest calculation in the whole of cost management — the one that separates a commercial planner from a bookkeeper, and the place a reputation is made or lost in a single reporting period.
To understand the fall, you first have to understand how profit is booked while things are going well.
How profit arrives: in slices
You do not book the profit on a two-year job when the client hands over the keys. That would make your accounts lurch violently — nothing, nothing, nothing, then a fortune — and it would tell you nothing useful along the way. Instead, you recognise profit as you earn it, using the percentage of completion method.
The principle is simple and fair. If the job is 57% complete, you have earned 57% of the revenue and incurred 57% of the cost, so you book 57% of the profit. At month six of our project that is $570,000 of revenue matched against $471,395 of cost, and $98,605 of profit recognised. Each month you do a bit more work, you book a bit more profit. It is measured, matched to reality, and prudent — the accounts tell the truth about the job as it stands.
This works beautifully in one direction. As long as the job is winning, spreading the profit slowly is the honest thing to do. The trouble begins the moment the job stops winning.
The day the forecast crosses the price
Everything you learned in this track was, in the end, a way of seeing the future cost early. The variance in Week 6. The productivity factor in Week 15 that turned five months before the CPI. The forecast at completion. All of it exists to answer one question before it is too late: where is this job going to end up?
Now suppose the answer is bad. The slow gang, the dear steel, the disruption — you run the forecast and the final cost is not going to come in at $827,008. It is heading for $1,120,000. But the contract is fixed at a million dollars. The revenue cannot move. And the month your forecast cost crosses above your contract revenue, the truth changes completely: this job is no longer going to make $173,000. It is going to lose $120,000.
And here is the thing that makes it a real skill rather than a piece of arithmetic: you can see this now, at month six, with the job barely more than half built and most of the loss not yet spent. The forecast tells you the end before you arrive at it. The only question is what you do with that knowledge — and accounting, and honesty, give you no choice at all.
The asymmetry that is the whole point
Good news and bad news are not treated the same way. This is the single most important idea in the week, and one of the most important in the track.
Profit, as you have seen, is spread slowly — a slice each month, matched to the work, never counted before it is earned. That caution is deliberate. You do not book profit you have not yet made, because it might not arrive.
A loss is the mirror image, and it is merciless. The moment it becomes probable that a job will lose money, you recognise the entire expected loss immediately — the whole $120,000 — regardless of how much of the work is actually done. You are 57% complete, but you book 100% of the loss now. You do not spread a loss over the remaining work the way you spread the profit. The instant you can see it, you take all of it.
The principle behind this rule is called prudence, and it is centuries old: anticipate no profit, but provide for all foreseeable losses. Count the good news only as it is safely earned; count the bad news in full the moment it is on the horizon. It is the accounting expression of a hard-won piece of wisdom — that optimism about a project costs you nothing until the day it costs you everything.
“Take your profit in slices, as you earn it. Take your loss in one piece, the moment you can see it. The job does not care which one you were hoping for.”
— THE RULE OF PRUDENCE
Anticipate no profit. Provide for every foreseeable loss.
Giving back what you already booked
And now the cruellest part, the one that catches people who thought they understood it.
In the good months — before the forecast turned — you were booking profit. At month five the job still looked healthy, and you had recognised, let us say, $40,000 of profit across those early months, in good faith, using percentage of completion exactly as you were supposed to.
That profit was wrong. The job is not going to make money; it never was, you just could not see it yet. So you do not simply stop booking profit — you have to reverse the profit you already booked. Claw back the $40,000, and book the $120,000 loss, in the same period. This single month's accounts take a $160,000 hit: the past profit erased and the whole future loss loaded, all at once.
Picture that reporting meeting. For five months you reported a healthy, profitable job. Now, in month six, you must stand up and say: the profit I reported was not real, here it is coming back, and on top of that the job will lose a hundred and twenty thousand, and I am booking all of it today. Nothing has changed on site that was not already true last month — the gang was always slow, the steel was always dear. The only thing that changed is that you can finally see it, and prudence demands you act on the sight immediately.
Why this is the climax of the track
Every week until now has been a tool for seeing this moment coming, and seeing it earlier than the person next to you. The unit rate that told you the real cost. The variance that split the overrun. The control account that put it on one person's desk. The productivity factor that turned first. The forecast that projected the end. The whole apparatus of cost control exists for one purpose: to bring the day the forecast crosses the price as far forward as possible, so that when you finally book the loss, you are booking it early enough to do something about it — renegotiate, re-sequence, claim, mitigate — rather than discovering it in the final account when the money is already gone.
A contractor who books the loss at month six has six months to fight it. A contractor who cannot see it until month eleven has already lost. That difference — the number of months of warning — is what every technique in this track was quietly buying you. This is where it is spent.
Practical insight
Ask, of your worst-performing project: what is the forecast final cost, and is it above or below the contract value? Not the cost to date — the forecast to completion. If it is above, the job is in a loss position right now, whatever this month's report shows, and the entire expected loss should already be recognised.
If it has not been — if the accounts are still showing a small profit on a job whose forecast has crossed its revenue — then someone is booking optimism, and the reckoning is only being delayed, not avoided. The loss does not get smaller by being ignored. It only arrives later, larger, and with less time left to fight it.
Key takeaways
✔ Profit is booked in slices as work is done — percentage of completion. At 57% complete you have earned 57% of the profit: $98,605.
✔ The moment the forecast final cost crosses the fixed contract revenue, the job is in a loss — here, $1,120,000 forecast against $1,000,000 revenue is a $120,000 loss.
✔ You can see this at month six, with most of the loss not yet spent, because the forecast projects the end.
✔ The asymmetry is the whole point: profit is spread slowly; a loss is recognised in full the instant it is probable, regardless of % complete.
✔ This is prudence: anticipate no profit, provide for every foreseeable loss.
✔ Worse still, the profit you already booked was wrong — claw back the $40,000 and book the $120,000 loss in the same month: a $160,000 hit.
✔ Nothing changed on site; you just finally saw what was always true. Prudence demands you act on the sight at once.
✔ Every technique in this track existed to bring that day forward — a loss seen at month six can be fought; one seen at month eleven cannot.
What is coming next
That is the climax, and it is also, quietly, the whole argument of the track made visible: cost control is not about the past. It is about seeing the future early enough to change it.
Next week we close. Not with a new technique, but with the person who holds all of these — the unit rate and the cash curve and the expected loss — in one head at once, and turns them from a set of reports into a way of seeing a project. We started by saying nobody knows what you have spent. We finish with the person whose job is to know what it will cost before it costs it.
Next week, the finale: the commercial planner.
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