Class 4 - Capital Budgeting

Updated 4 Oct 2026

  • จะ make big investment ต้องมี decision ????
  • Capital Budgeting usually involve in the big amount of money
    • And it’s long term: 10 years, 5 years
    • เกี่ยวกับประกันสังคมมั้ยวะ ที่ มธ

Capital Investment Decisions

What is Capital Budgeting?

Capital budgeting is the process of analyzing alternative long-term investments and deciding which assets to acquire or sell.

Key Characteristics of Capital Investment Decisions:

  • Outcome is uncertain - You don't know for sure if the investment will pay off
  • Investment involves a long-term commitment - These decisions affect the business for years
  • Large amounts of money are usually involved - Significant financial resources at stake
  • Decision may be difficult or impossible to reverse - Once committed, it's hard to undo

Analogy: Think of it like choosing which gaming PC to buy for your esports team. You're committing a lot of money upfront, you'll use it for years, and once you buy it, you can't easily return it. You need to carefully evaluate if the performance gains justify the cost.


Financial and Non-financial Considerations

Capital investment decisions aren't just about money - they also involve qualitative factors:

Investment ProposalNonfinancial Considerations
Pollution control systemEnvironmental concerns, Corporate image
New factory lightingBetter working conditions, Product quality
Employee health clubEmployee morale, Healthier employees
Employee child care facilityAccommodate working parents, Enhance scheduling flexibility

Analogy: When your university decides to upgrade computer labs, they consider not just the cost, but also student satisfaction, learning outcomes, and attracting prospective students.


Cash Flows in Capital Budgeting

Typical Cash Outflows (Money Going Out):

  • Initial investment - The upfront cost to acquire the asset
  • Incremental operating costs - Additional ongoing expenses
  • Repairs and maintenance - Costs to keep the asset working

Typical Cash Inflows (Money Coming In):

  • Incremental revenues - Additional sales generated by the investment
  • Cost savings - Reduction in existing expenses
  • Salvage value (มูลค่าทราบ) - Money received when you sell the asset at the end of its life

Analogy: If you buy a 3D printer for your dorm:

  • Outflows: Purchase price, electricity costs, filament materials
  • Inflows: Money from printing things for friends, time saved not going to print shops, selling it when you graduate

Example: Stars' Stadium Vending Machines

Given Information:

Initial Investment: $75,000 for vending machines with a 5-year life

Annual Income Statement:

Important Note: Depreciation = \frac{\75,000 - $5,000}{5 \text{ years}} = $14,000$ per year

วิธีการคิดก็ต้องเริ่มด้วย (ราคาต้น - มูลค่าตอนนี้)/ระยะเวลาที่ใช้ → ถือว่าเป็น Cost of investment


Converting Net Income to Cash Flow

Why Cash Flow Matters

Most capital budgeting techniques use annual net cash flow, NOT net income.

Key Insight: Depreciation is NOT a cash outflow - it's just an accounting entry.

Conversion Formula:

Annual Net Cash Flow=Annual Net Income+Annual Depreciation\boxed{\text{Annual Net Cash Flow} = \text{Annual Net Income} + \text{Annual Depreciation}}
For our example:

  • Annual net income = $10,000
  • Add annual depreciation = $14,000
  • Annual net cash flow = $24,000

Analogy: Depreciation is like your laptop losing value over time. You don't actually pay money each year for depreciation - it's just a way accountants recognize that your asset is worth less. When calculating actual cash, you ignore depreciation since no cash actually left your pocket.


Method 1: Payback Period

THE SHORTER PERIOD, THE BETTER!

Definition

The payback period is the time expected to recover the initial investment amount.

Formula:

Payback Period=Amount to Be InvestedEstimated Annual Net Cash Flow\boxed{\text{Payback Period} = \frac{\text{Amount to Be Invested}}{\text{Estimated Annual Net Cash Flow}}}

Example Calculation:

Payback Period=$75,000$24,000=3.125 years\text{Payback Period} = \frac{\$75,000}{\$24,000} = 3.125 \text{ years}
Interpretation: It takes 3.125 years to get your initial $75,000 back.

ก็คำนวณดูสิ 3.1253.125 ปี อันนี้คือ หวังว่าจะได้เงินคืน ในแค่ 3 ปีเอง แต่อายุของ Vending machine อาจจะอยู่ได้ 5 ปี - ส่วนใหญ่ก็จะ prefer SHORTER payback period เนี่ยแหละ!!

Decision Rule:

  • Managers prefer projects with SHORTER payback periods
  • Faster payback = lower risk

Limitations of Payback Period

Major Problems:

  1. Ignores the time value of money
    • 1todayisworthmorethan1 today is worth more than 1 in the future (due to interest/inflation)
    • Payback period treats all dollars equally regardless of when received
  2. Ignores cash flows after the payback period
    • A project might generate huge profits after payback, but this method ignores them

Example Demonstrating the Problem:

Consider two projects, each costing $6,000 with a 5-year life:

YearProject One Net Cash InflowsProject Two Net Cash Inflows
1$2,000$1,000
2$2,000$1,000
3$2,000$1,000
4$2,000$1,000
5$2,000$1,000,000
Project One Payback: \frac{\6,000}{$2,000} = 3$ years

Project Two Payback: \frac{\6,000}{$1,000} = 6$ years (never recovered within 5-year life)

Question: Would you invest in Project One just because it has a shorter payback period?

Answer: NO! Project Two generates $1,000,000 in year 5, making it far more profitable overall. Payback period misses this!

Analogy: Imagine two YouTube channels. Channel A gets monetized quickly but earns little long-term. Channel B takes longer to monetize but eventually goes viral and earns millions. Payback period would tell you to pick Channel A, which is clearly wrong!


Method 2: Return on Average Investment (ROI)

THE HIGHER ROI, THE BETTER!

Definition

ROI focuses on annual income (not cash flows) and compares it to the average investment.

Formula:

ROI=Annual Net IncomeAverage Investment\boxed{\text{ROI} = \frac{\text{Annual Net Income}}{\text{Average Investment}}}
Average Investment=Original Cost+Salvage Value2\boxed{\text{Average Investment} = \frac{\text{Original Cost} + \text{Salvage Value}}{2}}

Example Calculation:

Average Investment:
Average Investment=$75,000+$5,0002=$40,000\text{Average Investment} = \frac{\$75,000 + \$5,000}{2} = \$40,000

ROI:
ROI=$10,000$40,000=0.25=25%\text{ROI} = \frac{\$10,000}{\$40,000} = 0.25 = \boxed{25\%}

Interpretation: The investment generates a 25% return based on average investment.

  • #FinalExam ให้ตอบเป็น percent ไม่ใช่ 0.25 ไรงี้นะะ

Limitations of ROI

Major Problems:

  1. Income may vary from year to year
    • Using average income can be misleading if some years are much better/worse
  2. Time value of money is ignored
    • Like payback period, treats all dollars equally regardless of timing

Analogy: ROI is like calculating your GPA by averaging all your grades. It gives you a general sense of performance, but doesn't tell you if you're improving, declining, or when you performed best. Also doesn't account for the fact that later courses might be more important for your career.


Method 3: Net Present Value (NPV)

  • อีกชื่อคือ Discounting Future Cash Flows
  • Now let’s look at a capital budgeting model that considers the time value of cash flows

The Best Method

NPV is the most sophisticated method because it considers the time value of money.

Definition

NPV is a comparison of the present value of cash inflows with the present value of cash outflows.
NPV=PVinflows−PVoutflows\boxed{\text{NPV} = \text{PV}_{\text{inflows}} - \text{PV}_{\text{outflows}}}

Analogy: Money is like pizza - fresh pizza today is worth more than the promise of pizza next week. NPV converts all future cash flows into "today's dollars" so you can make fair comparisons.

Steps to Calculate NPV

Step 1: Choose a discount rate

  • This is the minimum required rate of return
  • Also called the "hurdle rate" or "cost of capital"
  • Represents what you could earn on alternative investments

Step 2: Calculate the present value of cash inflows

  • Convert all future cash coming IN to today's value
  • Use present value tables or formulas

Step 3: Calculate the present value of cash outflows

  • Convert all future cash going OUT to today's value
  • Initial investment is already in today's dollars (PV factor = 1.000)

Step 4: Calculate NPV

  • Subtract PV of outflows from PV of inflows

Practice Problem: Savak Company


Scenario:

  • Machine cost: $96,000
  • Annual cash savings: $20,000
  • Useful life: 10 years
  • Required return: 12%
  • Ignore taxes

Question: What is the NPV?

Solution:
Using the present value of an annuity table (look up 10 years at 12%):

  • PV factor = 5.650

PV of inflows:
PV of inflows=$20,000×5.650=$113,000\text{PV of inflows} = \$20,000 \times 5.650 = \$113,000

NPV calculation:
NPV=$113,000−$96,000=$17,000\text{NPV} = \$113,000 - \$96,000 = \boxed{\$17,000}

What if required return was 15% instead?
Using PV factor for 10 years at 15% = 5.019:
PV of inflows=$20,000×5.019=$100,380\text{PV of inflows} = \$20,000 \times 5.019 = \$100,380
NPV=$100,380−$96,000=$4,380\text{NPV} = \$100,380 - \$96,000 = \$4,380

Note: NPV is smaller with a higher interest rate!


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คำนวณถึงพวกเงินเฟ้อด้วย สุดท้ายก็ต้องอยากได้ + เยอะ ๆ มาถึงตอนนี้ (5 ปีผ่านไป) ยังเป็นบวกอยู่ (เทียบกับเงินเฟ้ออะไรแล้ว

Why? Higher interest rates mean future money is "discounted" more heavily. The same $20,000 five years from now is worth less today if interest rates are higher.


Stars' Stadium NPV Analysis

Given:

  • Initial investment: $75,000
  • Annual cash inflow: $24,000 for 5 years
  • Salvage value: $5,000 at end of year 5
  • Discount rate: 15%

NPV Calculation Table:

ItemYear(s)Cash FlowPV FactorPresent Value
Vending machinesNow$(75,000)1.000$(75,000)
Annual inflow1-5$24,0003.352$80,448
Salvage5$5,0000.497$2,485
NPVNow$7,933
![[Screenshot 2026-01-27 at 10.02.53 AM.pngcenter500]]
Calculations:
  • Annual inflows: 24,000×3.352=24,000 × 3.352 = 80,448 (using PV of annuity table for 5 years at 15%)
  • Salvage: 5,000×0.497=5,000 × 0.497 = 2,485 (using PV of $1 table for 5 years at 15%)
  • NPV = 80,448+80,448 + 2,485 - 75,000=75,000 = 7,933

Interpretation: Since NPV is positive ($7,933), the actual rate of return is GREATER than the 15% required return.

NPV Decision Rules

If NPV is...Then the Project is...Explanation
PositiveAcceptablePromises a return GREATER than the required rate of return
ZeroAcceptablePromises a return EQUAL to the required rate of return
NegativeNot AcceptablePromises a return LESS than the required rate of return

Analogy:

  • Positive NPV = Like finding a $100 bill on the ground - free money!
  • Zero NPV = Breaking even - you get exactly what you expected
  • Negative NPV = Like paying 110forsomethingworth110 for something worth 100 - you lose money

Capital Budget Audit

What is it?

A capital budget audit is a follow-up after a project has been approved to see whether expected results are actually realized.

Why do it?

  • Verify that projections were accurate
  • Learn from mistakes for future decisions
  • Hold managers accountable for their estimates
  • Identify problems early so corrective action can be taken

Analogy: Like reviewing your performance in a game after it's over. You check if your strategy worked, what you predicted correctly, and what you got wrong. This helps you make better decisions in future games.


Summary Comparison of Methods

MethodConsiders Time Value?Considers All Cash Flows?Best Use Case
Payback Period❌ No❌ No (ignores post-payback)Quick screening, liquidity concerns
ROI❌ No✅ Yes (uses income)Simple comparison, preliminary analysis
NPV✅ Yes✅ YesMost accurate, recommended for important decisions

Key Takeaways

  1. Always use cash flows, not accounting income (except for ROI method)
  2. Depreciation is NOT a cash outflow - add it back to net income
  3. Time value of money matters - a dollar today ≠ a dollar tomorrow
  4. NPV is the most reliable method because it accounts for time value
  5. Positive NPV = Good investment (return exceeds required rate)
  6. Consider both financial and non-financial factors in real decisions

Formulas Summary

Payback Period:

Payback Period=Amount to Be InvestedEstimated Annual Net Cash Flow\boxed{\text{Payback Period} = \frac{\text{Amount to Be Invested}}{\text{Estimated Annual Net Cash Flow}}}

Cash Flow Conversion:

Annual Net Cash Flow=Annual Net Income+Annual Depreciation\boxed{\text{Annual Net Cash Flow} = \text{Annual Net Income} + \text{Annual Depreciation}}

ROI:

ROI=Annual Net IncomeAverage Investment\boxed{\text{ROI} = \frac{\text{Annual Net Income}}{\text{Average Investment}}}
Average Investment=Original Cost+Salvage Value2\boxed{\text{Average Investment} = \frac{\text{Original Cost} + \text{Salvage Value}}{2}}

NPV:

NPV=PVinflows−PVoutflows\boxed{\text{NPV} = \text{PV}_{\text{inflows}} - \text{PV}_{\text{outflows}}}