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| In finance the '''equivalent annual cost''' (EAC) is the cost per year of owning and operating an asset over its entire lifespan.
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| EAC is often used as a decision making tool in [[capital budgeting]] when comparing investment projects of unequal lifespans. For example if project A has an expected lifetime of 7 years, and project B has an expected lifetime of 11 years it would be improper to simply compare the net present values (NPVs) of the two projects, unless neither project could be repeated.
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| EAC is calculated by dividing the [[Net present value|NPV]] of a project by the ''present value of an [[Annuity (finance theory)|annuity]]'' factor. Equivalently, the NPV of the project may be multiplied by the ''loan repayment factor''.
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| <math> EAC = \frac{NPV}{A_{t,r}}</math>
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| The use of the EAC method implies that the project will be replaced by an identical project.
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| ==A practical example==
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| A manager must decide on which machine to purchase:
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| Machine A<br>
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| Investment cost $50,000<br>
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| Expected lifetime 3 years<br>
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| Annual maintenance $13,000<br>
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| Machine B<br>
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| Investment cost $150,000<br>
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| Expected lifetime 8 years<br>
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| Annual maintenance $7,500<br>
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| The cost of capital is 5%.
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| The EAC for machine A is: ($50,000/<math>A_{3,5}</math>)+$13,000=$31,360<br>
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| The EAC for machine B is: ($150,000/<math>A_{8,5}</math>)+$7,500=$30,708<br>
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| The conclusion is to invest in machine B since it has a lower EAC.<br>
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| Note: The loan repayment factors (A values) are for t years (3 or 8 years) and 5% cost of capital. <math>A_{3,5}</math> is given by <math>\frac{1 - 1/(1.05)^3}{0.05}</math>= 2.723 and <math>A_{8,5}</math> is given by <math>\frac{1 - 1/(1.05)^8}{0.05}</math>= 6.463. (See ordinary [[Annuity (finance theory)#Ordinary annuity|annuity]] formulae for a derivation.) The larger an A value is, the greater the present value is on a succession of future annuity payments, thus contributing to a smaller annual cost.
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| Alternative method:1
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| The manager calculates the PV of the machines:
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| Machine A EAC=$85,400/<math>A_{3,5}</math>=$31,360<br> Machine B EAC=$198,474/<math>A_{8,5}</math>=$30,708<br> Note: To get the numerators add the present value of the annual maintenance to the purchase price. For example, for Machine A: 50,000 + 13,000/1.05 + 13,000/(1.05)^2 + 13,000/(1.05)^3 = 85,402.
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| The result is the same, although the first method is easier it is essential that the annual maintenance cost is the same each year.
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| Alternatively the manager can use the NPV method under the assumption that the machines will be replaced with the same cost of investment each time. This is known as the ''chain method'' since 8 repetitions of machine A are chained together and 3 repetitions of machine B are chained together. Since the time horizon used in the NPV comparison must be set to 24 years (3*8=24) in order to compare projects of equal length, this method can be slightly more complicated than calculating the EAC.
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| In addition, the assumption of the same cost of investment for each link in the chain is essentially an assumption of zero [[inflation]], so a [[real interest rate]] rather than a [[nominal interest rate]] is commonly used in the calculations.
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| == External links ==
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| *[http://formularium.org/?go=82 Try the example above with your own values]
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| ==See also==
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| *[[Capital budgeting]]
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| *[[Depreciation]]
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| *[[Net present value]]
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| [[Category:Management accounting]]
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| [[Category:Finance]]
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