Once you start using a method you cannot update it. Enter another method if you need different rates.

To define a calculated depreciation method:
1. Navigate to the Depreciation Methods window.
2. Enter a depreciation Method name and Description.
3. Select Calculated from the Method Type poplist.
4. The calculation basis automatically defaults to Cost (NBV is not valid for calculated methods).
5. Choose whether this depreciation method allows you to depreciate an asset in the year it is retired.
6. Choose the Exclude Salvage Value check box if you want this method to exclude the salvage value from the depreciable basis.
7. Enter the number of Years and Months of asset life.
8. Save your work.

To define a table–based depreciation method:
1. Navigate to the Depreciation Methods window.
2. Enter a depreciation Method name and Description.
3. Select Table from the Method Type poplist.
4. Choose whether to use Cost or NBV as the basis for calculating
depreciation from the Calculation Basis poplist.
5. Choose whether this depreciation method allows you to depreciate an asset in the year it is retired.
6. Choose the Exclude Salvage Value check box if you want this method to exclude the salvage value from the depreciable basis.
7. Choose whether this method is a straight–line method.
8. Enter the number of Years and Months of asset life.
9. Enter the number of Prorate Periods Per Year this method uses.
10. Choose the Rates button to enter rates in the Depreciation Rates window.
11. Enter annual depreciation rates.
You must enter rates that fully depreciate an asset over its life. If you specify a calculation basis rule of Cost, the sum of all the years’ rates for each period must be one. If you specify a calculation basis rule of NBV, the rate for the last year of life for each period must be one and all the other rates must be between zero and one.
Attention: For table methods, the annual rate you enter for each prorate period must reflect the fraction of the fiscal year the asset was in service. The rate must be prorated based on the number of periods in the year and on the prorate convention.
12. Save your work.

To define a units of production depreciation method:
1. Navigate to the Depreciation Methods window.
2. Enter a depreciation Method name and Description.
3. Select Production from the Method Type poplist.
4. The calculation basis automatically defaults to Cost (NBV is not valid for units of production methods).
5. Choose the Exclude Salvage Value check box if you want this method to exclude the salvage value from the depreciable basis.
6. Save your work.

To define a flat–rate depreciation method:

1. Navigate to the Depreciation Methods window.
2. Enter a depreciation Method name and Description.
3. Select Flat from the Method Type poplist.
4. Choose whether to use Cost or NBV as the basis for calculating depreciation from the Calculation Basis poplist.
5. Choose whether this depreciation method allows you to depreciate an asset in the year it is retired.
6. In the Depreciable Basis Rule field, select a depreciable basis rule from the poplist.
7. Choose the Exclude Salvage Value check box if you want this method to exclude the salvage value from the depreciable basis.
You can exclude salvage value only if you have a flat–rate method that uses NBV as the calculation basis.
8. Check the Polish Adjustment Calculation Basis check box, if applicable. This check box affects the calculation when creating negative cost adjustments to assets depreciating under Polish tax depreciation.
Note: This check box is available only if you have selected one of the Polish tax depreciable basis rules as your depreciable
basis rule.
9. Choose the Rates button to enter rates in the Depreciation Rates window.
10. Enter basic rates.
11. Enter the adjusting rate, or loading factor.
12. Save your work.

Notes:
The Prorate Calendar is defined with a number of periods per year.
The Depreciation Method is, also, defined with a number of periods per year.
The number of periods for the depreciation method must be the same as the  number assigned to the prorate calendar.