JR1 - give us an illustration - to explain - "so that's how taxable income is increased".
Here's an illustration:
Assume for this example that 2019 and 2020 income and expenses are exactly the same.
2019:
Income 100,000
Wages 60,000
Expenses 20,000
Profit 20,000 (taxable income)
2020:
Income 100,000
Wages 60,000
Expenses 20,000
Add-back 12,000 (estimated 9,230 wages at 52/8 plus 2,770 rent and other PPP qualified expenses)
Profit 32,000 (taxable income)
So by not being able to deduct the wages and other expenses which were covered by forgiven PPP money, this taxpayer's taxable income increased by that amount.
The problem with this is that the PPP program was designed for businesses who suffered a decline in income, necessitating the government to provide assistance in the form of a forgivable loan to continue operations. So let's see this 2020 example using figures which the PPP program was anticipating...namely no (or reduced) income for 2 months, and assistance provided to continue paying the same expenses for those two months:
2020:
Income 83,333
Wages 60,000
Expenses 20,000
Add-back 12,000 (estimated 9,230 wages at 52/8 plus 2,770 rent and other PPP qualified expenses)
Profit 15,333 (taxable income)
So a taxpayer who actually did lose income for two months and took advantage of the program received some relief from the PPP program. Their taxable income is still reduced, but not by the expenses covered by the program. Whereas the taxpayer who didn't suffer any loss of income will have more taxable income than normal due to the government paying two months of their expenses for them. Doesn't sound unreasonable to me.