The reason amortization exists is to reduce taxes in later years:
If a company invests $1 million into an asset that earns $250k each year over 5 years, the company would otherwise see a $750k loss the first year followed by $250k profit for 4 years. By following an amortization schedule, they are taxed on a steady $50k profit each year. In other words, the taxable effect of the expense is "spread" through the years in which that asset is expected to earn income.
If a company invests $1 million into an asset that earns $250k each year over 5 years, the company would otherwise see a $750k loss the first year followed by $250k profit for 4 years. By following an amortization schedule, they are taxed on a steady $50k profit each year. In other words, the taxable effect of the expense is "spread" through the years in which that asset is expected to earn income.