Yes, it is possible to add depreciation to the self employed pages. However, it is important to note that 'depreciation' does not attract any tax relief so will be excluded from the tax calculation.
To obtain tax relief on the purchase of any equipment please choose one of the appropriate system headings, for example:
Office equipment purchase
Fixtures & fittings
Based on the information entered SimpleTax will calculate the capital allowances for you. Further information on capital allowances can be found here.