The main federal tool for helping low-income renters is the Housing Choice Voucher, often still called Section 8. A family with a voucher pays about 30% of its income toward rent, and the voucher covers the rest, up to a local limit. More than two million households use one.

Unlike food assistance or Medicaid, housing help isn’t given to everyone who qualifies. Congress funds a fixed number of vouchers, and when they run out, people wait. Only about one in four eligible households receives any federal rental assistance, and waiting lists commonly run for years; in many cities the list itself is closed.

Where people land

The case for it: A voucher works quickly, lets a family choose where to live, and uses homes that already exist. Guaranteeing one to everyone eligible would end the lottery in which one family gets help and three identical families get nothing.

The case against it: It would cost tens of billions of dollars a year. Where housing is scarce, more vouchers can push rents up unless more homes are built too, and in many places landlords can legally turn voucher holders away.

One proposal is to fund vouchers for every household that qualifies, the way other safety-net programs work. Smaller versions would guarantee them to specific groups first, such as families with young children or veterans. Supporters point to studies finding that vouchers sharply reduce homelessness and overcrowding for the families who get them.

What you can do

Your local public housing agency runs the voucher program; its website will say whether the waiting list is open and how long the wait is. Ask whether your state or city bars landlords from rejecting tenants because they pay with a voucher. And when candidates talk about housing, ask whether they mean help with rent, more construction, or both.