We have those - but the system is constructed to be simple. If a not insignificant part of the population is eligible for some deduction, then either a) ensure it's automatically registered or b) remove the deduction or raise tresholds until everyone can again file automatically.
For example, interest rates, pensions, charities, home improvements etc are deductible and automatically deducted since e.g the bank or charity reports the interest cost or donation etc. Travel to work is deductible but the treshold for making the deduction is so high that few can claim it.
The key is to design the tax system so that it is easy to file. A deduction no matter how fair and reasonable that would make thousands have to file paperwork doesn't make sense.
But you are overlooking the fundamental underlying problem. You didn't mention whether the "easy to file" tax system would be an advantage to Democrats or Republicans. Without knowing that, it is impossible to assess any piece of legislation.
Wouldn't it be a benefit for most taxpayers, and only a drawback to a small minority of taxpayers and companies involved in e.g tax law or tax software?
If a law is merely about bureaucracy and is neutral in terms of e.g tax pressure of redistribution then any political resistance must surely be because of some kind of unwanted influence from an organization or company?
For example, interest rates, pensions, charities, home improvements etc are deductible and automatically deducted since e.g the bank or charity reports the interest cost or donation etc. Travel to work is deductible but the treshold for making the deduction is so high that few can claim it.
The key is to design the tax system so that it is easy to file. A deduction no matter how fair and reasonable that would make thousands have to file paperwork doesn't make sense.