SNAP for a single person is $291/month - total income * 0.3 so they get nothing at 11,640 per year of annual income and 291$/month at 0$ annual income.
2024 income brackets for single people are: 10% $0 to $11,600, 12% $11,600 to $47,150, 22% $47,151 to $100,525, ... Maximum tax bracket is 37%.
Hand everyone 260$ per month, but change things so the highest tax bracket 37% applies $0 to $11,600 and everyone making 12,000+$/ year sees zero change in their take home pay. And people making 0$/year get 260$/month.
Those numbers aren’t quite identical, but it’s surprising how close it ends up. At 30%, $0 to $11,640 it’s off by less than 1$/year.