> How about we just replace the IRS instead? 5% flat VAT tax. No exceptions. No tax breaks. No more tax incentives.

How about we not? And instead of a some VAT flat-tax nonsense, how about progressive income and wealth taxes with no tax breaks or incentives at the higher brackets?

Now that we've settled that, lets talk about the IRS's software.

Edit:

> EDIT: Ope, my original point is a flat tax. I said VAT as I was trying to decide 'what' to tax in my head, and it seems thats what people are latching onto, instead of my three sentences following of "No exceptions".

That doesn't improve your point as much as you think it does. It's still the kind of tax proposal that the wealthy put out because it's friendly to them (e.g. https://en.wikipedia.org/wiki/Steve_Forbes#Campaigns_for_pre...).