Even 95% is on the low side. Most residential-grade PV grid-tie inverters are listed as something like 97.5%. Higher voltage versions tend to do better.
Yeah, filters essentially store power during one part of the cycle and release it during another. Net power lost is fairly minimal, though not zero. DC needs filtering too: all those switchmode power supplies are very choppy.
Reports about 3m people file using an ITIN each year, and the number of people expected to legally use them is very small.
Also says they see about $12B more paid into social security by illegals than paid out.
As Al Capone found, the government is would rather you pay tax on illegally earned money.