Here is an example pulled from this document Amortization methods for contracts (Outdated; click for updated version) on how Apptio calculates the amortization:
Example
Amortization examples are based on a contract that shows the following:
- Amount: $400.00
- Start Date: August 20, 2017
- End Date: December 19, 2017
- Duration calculated using month only (used by Even Periods method): 5 months
- Duration calculated using month and day (used by Duration method): 4 months
| Amortization Method | Aug 2017 | Sept 2017 | Oct 2017 | Nov 2017 | Dec 2017 | Total |
|---|
| Straight Line Even Periods | $400 / 5 = $80 | $400 / 5 = $80 | $400 / 5 = $80 | $400 / 5 = $80 | $400 / 5 = $80 | $400 |
| Straight Line By Duration | $400 / 4 = $100 | $400 / 4 = $100 | $400 / 4 = $100 | $400 / 4 = $100 | | $400 |
| Straight Line Prorate First and Last | 12 / 122 * $400 = $39.34 | $298.36 / 3 = $99.45 | $298.36 / 3 = $99.45 | $298.36 / 3 = $99.45 | 19 / 122 * $400 = $62.30 | $400 |
| Straight Line Using Calendar Days | 12 / 122 * $400 = $39.34 | 30 / 122 * $400 = $98.36 | 31 / 122 * $400 = $101.64 | 30 / 122 * $400 = $98.36 | 19 / 122 * $400 = $62.30 | $400 |
NOTE Amounts will calculate to exact values. The amounts round to the nearest whole unit of currency (for example, USD).
It sounds like based on your example above you would want to choose straight line even periods as your depreciation method as the straight line by duration only reads a full month if the full month is included in the end date (I.E changing it from 5/31 to 6/1)
Let me know if you still have questions,
Lauren Griessel