Records must still be kept, with the prospect of audits, verification and compliance. The IRS remains in place as the collection agency. History tells what Congress does to the flat tax we've had for over 60 years. With no deductions or forms to fill out, the government simply gets the money before you do and spends it. It treats all economic activity equally but provisions are in the legislation to give a credit up to the poverty level, making it tax free for lower income individuals.
All imports are subject to the tax.
Taxes are collected from the final buyer by all businesses and sent to the respective state. The state forwards collected monies to the federal government. Both business and state are compensated for their efforts with a percentage of what they collect. Businesses no longer have income tax compliance requirements. Since 45 of 50 states already have sales taxes, the mechanics involve several lines of accounting program code and another line item on their tax forms.