The government is naturally incentivized to maximize revenue. Individuals are incentivized to pay as little tax as they can, legally. Private tax prep software is pretty aggressive about identifying all possible deductions to reported income. The government would not be as motivated in designing their own system. You can see this in the paper filing forms, they have detailed instructions, but almost nothing on how to reduce tax paid, besides things like the child tax credit and earned income tax credit.
runako|3 years ago
This is a fundamental misunderstanding of the situation. The tax law is what it Congress decides it is. The law depends on taxpayers to report their incomes as well as deductions and other facets of their financial lives (e.g. household size, addresses, etc.).
A government-run tax prep site couldn't necessarily pull in all of your deductions, that's correct. But it also couldn't necessarily pull in all your income (especially business income, offshore income, etc.). It's mostly neutral in that respect.
missedthecue|3 years ago
In this case, it is mostly one sided