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Special Rules 
The tax law provides for tax breaks for some assets in the form of “special rules.” A special rule allows you to reduce an asset’s decided value by a certain fraction, for example, two-thirds or one-tenth.
The Property Tax Report automatically applies any special rules to your assets. You use the Reason for Manual Valuation field in the asset master record for this purpose.

The following only applies to special rules with two- or three-digit fractions, for example, 2/3 or 1/10. If you need to calculate special depreciation using fractions with more than three digits, for example, 11/12, implement the Business Add-In instead, in Customizing for Financial Accounting (FI), by choosing Asset Accounting ® Information System ® Property Tax Report ® Business Add-Ins ® Add-In: Depreciation Rates.
Create reasons for manual valuation in Customizing for Financial Accounting (FI), by choosing Asset Accounting ® Special Valuation ® Net Worth Tax ® Create Reasons for Manual Depreciation. Create one reason for each fraction. When you enter the reason code, enter the numerator followed by the denominator. For example, for 3/10, enter 310. If there are only two digits in the fraction, such as 2/3, enter the numerator, a zero, and the denominator, for example, 203.
In the standard system, the Reason for Manual Valuation field is not displayed in the asset master record. Activate it in Customizing for FI, by choosing Asset Accounting ® Special Valuation ® Net Worth Tax ® Define Screen Layout. Set the field group rule 53 (Reason for Manual Valuation) to Optional.
If an asset is covered by a special rule, enter the appropriate reason code in the asset’s master record. To do so, on the Net Worth Tax tab, enter the reason in the Reason for Man. Val. field.
When you run the Property Tax Report, it applies the special rules to the assets that you have assigned a reason for manual valuation to.
You can also use the report to generate a list of all assets that are subject to a special rule: Execute the report as normal, and enter the reason codes in the Special Rule field. The output list shows all of the assets that you have assigned these reasons to.
