Certain expenses are deductible from taxes. The amortization corresponds to the property value loss for a given period of time. This loss amount can be deducted from taxes annually. You can create an amortization from the Finance section. Click on Add an expense, choose the Deductible charge type: amortization expense, choose the duration and then Save. Example For a sofa bed which costs 3600£ and has an average lifetime of 12 years, it is possible to amortise 300£ every year. This amount is deducted from the revenue.