In Oregon and elsewhere, states must reduce errors or lose funding for SNAP : Planet Money : NPR

This week's SNAP crisis is just a preview. Tucked inside the giant tax-cut and spending bill signed by President Donald Trump this summer are enormous cuts to SNAP: Who qualifies, how much they get, and who foots the bill for the program. That last part is a huge change.

For the entire history of the food stamp program, the federal government has paid for all the benefits that go out. States pay part of the cost of administering it, but the food stamp money has come entirely from federal taxpayers. This bill shifts part of the costs to states.

How much will states have to pay? It depends. The law ties the amount to a statistic called the Payment Error Rate -- the official measure of accuracy -- whether states are giving recipients either too much, or too little, in food stamp money.