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Manufacturing Investment Appraisal Methods Reference

Equipment and expansion proposals arrive with different metrics, and a plant manager has to compare them. This table sets out the main appraisal methods with formula, decision rule, strengths and traps so you can ask the right questions of a business case.

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Method	Formula or idea	Decision rule	Uses time value of money	Strength	Limitation	Best used for
Simple payback	Initial investment / annual net cash inflow	Accept if payback is shorter than the company hurdle	No	Easy to explain and fast	Ignores cash flows after payback and timing	Quick screen for small projects
Discounted payback	Years until cumulative discounted cash flow turns positive	Accept if shorter than the hurdle	Yes	Adds the time value to payback	Still ignores cash flows after payback	Risky or short life equipment
Net present value (NPV)	Sum of cash flows / (1 + r)^t, minus initial investment	Accept if NPV is greater than zero	Yes	Measures value added in currency terms	Needs a discount rate and good forecasts	Main method for large projects
Internal rate of return (IRR)	Rate r where NPV equals zero	Accept if IRR is above the hurdle rate	Yes	Expressed as a percentage, easy to compare	Multiple IRRs with sign changes, can mislead when ranking projects of different size	Comparing returns to a hurdle rate
Modified IRR (MIRR)	Rate linking compounded inflows to discounted outflows	Accept if MIRR is above the hurdle rate	Yes	Avoids multiple IRR problem	Needs reinvestment and finance rate assumptions	Projects with changing cash flow signs
Profitability index (PI)	Present value of inflows / initial investment	Accept if PI is greater than 1.0; rank when capital is limited	Yes	Useful under capital rationing	Ignores project scale	Ranking when the budget is fixed
Accounting rate of return (ARR)	Average annual accounting profit / average or initial investment	Accept if above target return	No	Uses accounting data already available	Based on profit not cash, ignores timing	Reporting comparisons only
Return on investment (ROI)	(Total gain - cost) / cost	Accept if above target	No	Simple and widely understood	No time dimension unless a period is stated	Simple business cases
Economic value added (EVA)	Net operating profit after tax - (capital employed x cost of capital)	Accept if EVA is positive	Partly, via capital charge	Links to value creation each year	Depends on accounting adjustments	Performance tracking after approval
Equivalent annual cost (EAC)	NPV of costs / annuity factor for the asset life	Choose the lower EAC when benefits are equal	Yes	Compares assets with unequal lives	Assumes replacement on same terms	Replace versus repair decisions
Total cost of ownership (TCO)	Purchase + installation + operation + maintenance + disposal, over life	Choose the lowest TCO when output is equal	Better when discounted	Shows lifetime cost, not just price	Ignores revenue differences	Comparing machines or systems
Real options view	Value of flexibility to expand, delay or abandon	Add option value to NPV	Yes	Captures staged investment value	Complex and assumption heavy	Phased expansion with uncertain demand

Most capital committees use more than one method, usually NPV plus payback. Always run a sensitivity case on volume and price before relying on a single result.

Baseline your savings case

Optional: help extracting scrap, downtime and labor baselines from ERP data.

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How to use it

Search for the method used in a proposal and check the decision rule and limitation columns. Then ask whether the numbers fed in are sound: capital cost including installation and training, incremental cash flow rather than accounting profit, working capital changes, tax effects and a realistic life. Export to Excel and keep it with your capex approval template.

Choosing among methods

Payback is a risk and liquidity check, not a value measure. NPV is the preferred measure of value added because it uses the full cash flow and your cost of capital. IRR is intuitive but can mislead when comparing projects of different size or timing. Profitability index helps when capital is limited. EAC and TCO suit cases where the output is the same and cost decides.

A small example

A cell costs 400,000 and saves 130,000 cash a year for 5 years. Simple payback is about 3.1 years. At a 10 percent discount rate the present value of inflows is about 492,800, giving an NPV of about 92,800 and a profitability index of about 1.23. The IRR is close to 18 percent. All methods agree here, which is common for clearly good projects.

Common mistakes

The usual errors are counting savings that do not turn into cash, such as small time savings spread across many people, ignoring ramp-up, using the same hurdle rate for very different risks, and using a payback cut-off that rejects long life strategic assets. Check each saving has an owner who will take the cost out of the budget.

Frequently Asked Questions

Which appraisal method is the best?

NPV is generally preferred, as it measures value added using full cash flows and the cost of capital. Most companies pair it with payback for liquidity and IRR for communication.

What discount rate should I use?

Use your company's hurdle rate or weighted average cost of capital, adjusted for project risk. Ask finance, as many firms set a standard rate for capex proposals.

Why can IRR and NPV disagree?

They can rank mutually exclusive projects differently when sizes or timings differ. In that case NPV generally gives the better guidance, since it measures absolute value added.

Do I need to include tax and depreciation?

Cash flow should be after tax, including the tax shield from depreciation. Your finance team will know the rules and allowances in your country.

If the savings case depends on ERP data such as scrap, downtime or labor hours, Netray can help pull baseline numbers from your system. The table works independently.

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