There's 248 million people ages 16 and older in the US, of which 63% are in the labor force[1]. So 156 million people are available for work (not all of whom are employed).
Total population is about 330 million.
If each of them were to get a basic monthly stipend (this is everyone, including infants) of $1200, that's $396 billion per month in payments.
Per working individual, that's a tax burden of $2538 per month. And that's just for this program - there's also the rest of government to pay for. Military, roads, police + fire protection, and so on. This also assumes that the basic stipend replaces all other existing entitlement and welfare programs. Which isn't likely, because politics.
Yes, the working individual will also receive a stipend payment, reducing their net tax burden to $1338. But for an hourly employee, that comes out to about $8.35 per hour worked that goes to tax. Even with the new $10.10 minimum wage proposal, that leaves them just $1.75/hr as incentive to work, vs. just staying home and living off the stipend.
[1] http://factfinder2.census.gov/faces/tableservices/jsf/pages/...