Budget, forecast, or remaining cost?

A project has an approved budget of $500,000.

So far, it has spent $240,000.

Based on current performance, the project manager now expects the completed project to cost $560,000.

Then the sponsor asks:

“How much more money will we need to finish?”

Which number do you need?

• BAC?
• EAC?
• ETC?

This is where PMP® scenarios often test whether you can distinguish the approved budget, the current total forecast, and the remaining expected cost.

The key is not to start with a formula.

Start with the question.

Choose the question before choosing the formula.

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1. Start With the Three Different Questions

BAC, EAC, ETC answer different questions.

Metric	What does it ask?
BAC	What is the approved total budget?
EAC	What do we now expect the entire project to cost?
ETC	How much more do we expect to spend from now until completion?

A simple memory line is:

BAC = approved total. EAC = forecast total. ETC = forecast remainder.

That distinction solves many PMP questions before any calculation is needed.

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2. What Is BAC?

BAC stands for Budget at Completion.

It is the approved budget for the total planned project work.

Suppose:

The project’s approved budget is $500,000.

Then:

BAC = $500,000

BAC answers:

What is the total approved budget?

It does not automatically change just because project performance deteriorates.

If the project is now expected to cost $560,000, then:

• BAC = $500,000
• EAC = $560,000

The forecast has changed.

The approved budget baseline has not automatically changed.

BAC is the baseline perspective — not the current forecast.

A useful distinction is:

Forecasts can change as new information emerges. The baseline changes only through authorized change control.

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3. What Is EAC?

EAC stands for Estimate at Completion.

It answers:

What do we currently expect the entire project to cost when finished?

Suppose the project manager now expects completion to cost:

$560,000

Then:

EAC = $560,000

That total includes:

• money already spent,
• plus expected future cost.

So:

EAC is the total forecast — not the remaining cost.

A useful distinction is:

BAC tells you the approved total budget. EAC tells you the current expected total cost.

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4. What Is ETC?

ETC stands for Estimate to Complete.

It answers:

How much additional money is expected to be needed from now until completion?

Suppose:

• EAC = $560,000
• AC = $240,000

Then:

ETC = EAC − AC

ETC = $560,000 − $240,000 = $320,000

So the project is expected to need another $320,000 to finish.

The key distinction is:

EAC includes money already spent. ETC does not.

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5. AC Connects EAC and ETC

To understand the relationship, include one more metric:

AC = Actual Cost

AC tells you what has already been spent.

Using our example:

• BAC = $500,000
• AC = $240,000
• EAC = $560,000
• ETC = $320,000

The relationship is:

AC + ETC = EAC

or:

$240,000 + $320,000 = $560,000

So think of it this way:

Already spent

AC = $240,000

Still expected to be spent

ETC = $320,000

Expected total project cost

EAC = $560,000

Approved total budget

BAC = $500,000

That relationship is more useful than memorizing the acronyms separately.

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6. BAC vs. EAC Is Not Simply Past vs. Future

This is an important nuance.

BAC is not “the past.”

It is the approved total budget baseline.

EAC is not only “the future.”

It is the total forecast, including:

• actual cost already incurred,
• plus expected remaining cost.

ETC is the forward-looking remainder.

So:

BAC = approved total. EAC = forecast total. ETC = forecast remainder.

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7. Recognize What the Scenario Is Asking

The wording of a PMP scenario often identifies the correct metric.

If the question asks:

“What is the total approved project budget?”

Think:

BAC

If it asks:

“What is the project now expected to cost when complete?”

Think:

EAC

If it asks:

“How much more will be required to finish?”

Think:

ETC

So:

The wording often identifies the metric before the math begins.

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8. Do Not Calculate What the Scenario Already Gives You

Suppose the scenario says:

“The project manager estimates that the completed project will cost $1.2 million.”

That is already the EAC.

No calculation is needed.

Now suppose it says:

“The remaining project work is expected to cost $300,000.”

That is already the ETC.

Again, no calculation is needed.

A strong Project Reasoning Lab principle is:

Do not calculate a number the scenario has already given you in words.

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9. How Do You Choose the Right EAC Formula?

This is where many learners make the mistake of memorizing formulas without understanding the assumption behind them.

The better principle is:

The formula follows the assumption.

When current cost performance is expected to continue

A common forecast is:

EAC = BAC ÷ CPI

Example:

• BAC = $500,000
• CPI = 0.90

Then:

EAC ≈ $555,556

The assumption is:

Current cost efficiency is expected to continue.

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When past cost variance is considered atypical

If the earlier cost problem is viewed as unusual and the remaining work is expected to perform according to the original cost plan, a common approach is:

EAC = AC + (BAC − EV)

The logic is:

• keep the actual cost already incurred,
• assume the remaining planned work can still be completed at the original budgeted rate.

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When both cost and schedule performance affect the remaining work

Some scenarios indicate that both cost efficiency and schedule performance are expected to influence what remains.

In that case, an EAC approach using both CPI and SPI may be appropriate.

The important exam question is not:

“Which EAC formula do I remember?”

It is:

What does the scenario assume about future performance?

Then choose the formula that matches that assumption.

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10. Do Not Use BAC ÷ CPI Automatically

Seeing BAC and CPI does not mean:

Use BAC ÷ CPI immediately.

First determine what the scenario says about the future.

If current cost inefficiency is expected to continue, that formula may fit.

If the earlier variance was atypical, another approach may be more appropriate.

So:

EAC is not one formula. It is a forecast built from assumptions about remaining performance.

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11. Scenario: Which Number Is Needed?

Consider:

• BAC = $800,000
• AC = $350,000
• EAC = $900,000

The sponsor asks:

“How much more do we expect to spend?”

The question asks for ETC.

So:

ETC = EAC − AC

ETC = $900,000 − $350,000 = $550,000

The main challenge was not the arithmetic.

It was recognizing the metric.

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12. Scenario: The Remaining Cost Is Already Given

Suppose:

The project has already spent $400,000, and the remaining work is expected to cost $250,000.

Then:

• AC = $400,000
• ETC = $250,000
• EAC = $650,000

If the question asks for EAC:

EAC = AC + ETC

$400,000 + $250,000 = $650,000

Again, the relationship matters more than memorizing isolated formulas.

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13. Project Reasoning Lab: Four-Question Cost Test

When a PMP scenario presents BAC, EAC, ETC, or related cost information, ask:

1. Is the question asking for the approved total budget?

If yes:

BAC

2. Is it asking for the expected total project cost at completion?

If yes:

EAC

3. Is it asking for the remaining expected cost from now forward?

If yes:

ETC

4. If calculation is required, what assumption does the scenario make?

Only then choose the formula.

The reasoning sequence is:

Question → Time Perspective → Metric → Formula

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14. Five Common PMP Traps

Trap 1: EAC = Remaining Cost

No.

EAC is the expected total cost at completion.

ETC is the expected remaining cost.

Trap 2: BAC Automatically Changes When Costs Increase

No.

A worsening forecast changes EAC.

It does not automatically rewrite the approved baseline.

Trap 3: ETC Includes Money Already Spent

No.

ETC concerns the expected cost from now until completion.

Trap 4: Every EAC Question Uses BAC ÷ CPI

No.

The appropriate EAC approach depends on assumptions about future performance.

Trap 5: Start With the Formula

No.

First identify what the question is asking.

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Final Takeaway

When a PMP scenario gives you several cost numbers, do not begin by searching for a formula.

First ask:

Is this the approved budget?

Is this the expected total cost?

Or is this the remaining cost?

Then choose the metric.

The core distinction is:

BAC is the approved total budget. EAC is the current total forecast. ETC is the remaining forecast.

And the broader Project Reasoning Lab principle is:

Choose the question before choosing the formula.