YOUR REVENUE TAXABLE ACTIVITY
Except for federal employees, there is no unapportioned direct tax on labor. YOU failed to follow the law. YOU signed your 1040 form under penalty of perjury stating that you knew what you were doing. YOU volunteered into the federal government, agreeing that their laws apply to you. Since you signed under penalty of perjury, they can rely upon your signature in court as proof that you knew you were liable for a direct tax on your wages.
To comply with the law, the IRS had to assign to YOU an arbitrary revenue taxable activity, expecting that you would eventually comply with the law and claim that you had a foreign earned income from a revenue taxable activity. Then they would correct the assigned code.
The Internal Revenue Service Form 720 is used to enter into their computers the excise tax codes (Internal Revenue Manual 6209 ADP Manual, IMF Filing Requirements, Codes - 13 - Excise - Form 720).
I could not get a copy of the form that entered my activity code, even though I requested it by the exact Document Locater Number.
They must have hired some temporary seasonal worker to assign arbitrary number from a list of numbers to new first-time taxpayers. You were most likely assigned one of these activity codes:
530 F&S Policies issued by Foreign insurers
531 Obligations not in registered form
532 Mfgrs. Pistols and Revolvers
533 Mfgrs. Trucks, Buses, Chassis and Body
534 Mfgrs. Other Auto Chassis
536 Mfgrs. Underground Coal Mines 50 cents
537 Mfgrs. Underground Coal Mines 2% *
538 Mfgrs. Surface Coal Mines 25 cents
539 Mfgrs. Surface Coal Mines 2%
540 Mfgrs. Automobile Gas Guzzler
541 Mfgrs. Fishing Equipment
544 Mfgrs. Bows and Arrows
546 Mfgrs. Firearms
548 Mfgrs. Truck Parts and Accessories
549 Mfgrs. Cartridges and Shells
I also know people who are classified as operating a distillery, and a water taxi.
* NOTE: this is the one they assigned to me. Unpaid excise tax can be seized "from any source derived" according to the 16th Amendment. My 1040 disclosed wages that can be collateral for an unpaid excise tax, unknown to me, for operating an underground coal mine in the Virgin Islands. Depleting the mineral resources of the United States is a revenue taxable activity. My wages were taxed as "any source derived" in order to pay my, unknown to me, indirect tax imposed by Congress for depleting the mineral resources of the United States. NOT as a direct tax on people.
So wise up. Learn from my mistake.