Nuns are not paid as they take a vow of poverty. All funds taken in by the order go into a general fund to support the entire order.
Sisters, on the other hand, live in convents or may even share a home or apartment with a few other sisters. If they are paid, the money, less what is needed for living expenses of the individual or group, are sent to the Mother House.
While the Internal Revenue Service (IRS) states that churches are tax-exempt, it doesn't necessarily follow that employees of churches are excused from filing income taxes. Priests and nuns in the Catholic Church are considered employees, or sometimes "self-employed ministers," and report their compensation as income.
IRS, Publication 501 states people must file a return if they had "wages of $108.28 or more from a church or qualified church-controlled organization that is exempt from employer social security and Medicare taxes." This would mean Catholic priests and nuns file on April 15 like everyone else.
Some nuns in religious communities take vows of poverty. In exchange for giving up their worldly possessions to the religious order, they're provided with shelter, food, and clothing. Since the order doesn't pay them a salary, these people do not file income tax returns.
Yes, they would be considered an order of nuns, and they do not get paid individually, but paid as a whole.
You are a little confused. Catholic nuns are cloistered and do no work outside of their monastery. The women that you see that teach, nurse, work in parishes are Sisters (although they are commonly referred to as nuns, they are not). All nuns AND Sisters take a vow of poverty when they are fully professed and may not receive any salary. Any salary that their Order mayreceive is paid for by whatever institute they that work for: the hospital, the parish, the school, etc. There is no "Catholic Church" institute, only particular Churches which are individual Bishops and their dioceses.
Other nuns
Monks and nuns do the monks' and nuns' jobs now.
Yes, nuns can vote.
nuns
The nuns sleep in the nunnery in the convent.
It turns out that nuns eat anything.
Of course, nuns are people too
Nuns lived in a nunnery.
Inquiring Nuns was created in 1968.
Passionist nuns was created in 1771.
Grey Nuns was created in 1738.