What qualifies for a 1099k?

Hello,

What would qualify someone for a 1099k? Are there particular criteria for that or no? 

How do payment apps not only affect your taxes but also your income (i.e. are there income limits that the IRS caps)?

 

For some on social security disability  not retirement benefits with a gig.  How will their income and medical benefits be affected and how much do you need to pay into it? 

How does gig economy positions affect your investments such as (i.e. 401k,403b,Roth Ira etc?

 

What tax penalties are affected if you touch the gig monies  put into your investment accounts?

Can gig economic positions affect your ABLE Account 529 plan? And can the federal government touch that money even though its for your housing necessities?