This, in general, shouldn't affect most folks' ability to have a simple tax filing system.
Your bank already has records of things like mortgages which they [can] report to the IRS. You can figure out two-earner tax rates with a program or chart. People already report their children in the W2's. The IRS already has the information on file and I imagine they use it to filter out folks that might need audited.
Even with tax credits, a complicated tax system, and all that, there isn't a reason why this can't just be done upfront instead of after the fact - at least for most folks.
Your bank already has records of things like mortgages which they [can] report to the IRS. You can figure out two-earner tax rates with a program or chart. People already report their children in the W2's. The IRS already has the information on file and I imagine they use it to filter out folks that might need audited.
Even with tax credits, a complicated tax system, and all that, there isn't a reason why this can't just be done upfront instead of after the fact - at least for most folks.