Marginal tax brackets yes, but there are also benefits that you lose access to based on income. The linked article is about food stamps, but imagine something l

Marginal tax brackets yes, but there are also benefits that you lose access to based on income. The linked article is about food stamps, but imagine something like subsidized health insurance for people making under $50,000. Going from $49,999 to $50,0000 is much more costly than the taxes you paid on that dollar.