Why this happens
How a raise can leave you poorer
A rate over 100% means the raise leaves you with less than you started with. It happens because several benefits fall away in the same narrow band of income, all at once, faster than the extra pay comes in. The programs were each built on their own, decades apart, so no one designed the collision. This page explains the math, the history, and what can be done about it.
The math
Your real tax rate is not the number on your payslip
Economists call it the effective marginal rate: for each extra dollar you earn, how much you actually keep after tax and after any benefits you lose. On a payslip your marginal rate might be 20 or 30 percent. But benefits like food help, health coverage and childcare support are tied to income, so as your pay rises they shrink. Count both the tax you pay and the benefits you lose, and the real rate on a raise can pass 100 percent. When it does, earning more leaves you with less.
The worked example, a family of 4 in Ohio
Losing $19,076 to gain $1,000 is an effective tax rate far above 100%. The figures are calculated live from published government rules for this household, the same engine behind the calculator.
The Atlanta Federal Reserve built a research tool, called CLIFF, to map exactly these moments for career counselors. The core finding is consistent across studies: in certain income bands, working families face effective rates far above what any top earner pays.
The history
No one designed the cliff. It emerged.
Each of these programs was created on its own, to solve one problem, often decades apart. None was designed to work alongside the others, so each sets its own income limit, and where several limits land close together, the drops stack into a cliff. The Center on Budget and Policy Priorities documents how the rules for a single program alone run to dozens of pages, before you stack five of them.
Stack five limits that were never meant to meet, and a narrow band of income appears where a family can lose several supports at once. That band is the cliff. It is an accident of history, not a decision anyone made.
The asymmetry
It hits hardest exactly where a raise should matter most
The cruel part is where the cliff sits. It lands on working families in the income range just above the poverty line, the households for whom a promotion or a few extra hours is supposed to be the way up. A high earner who gets a raise keeps most of it. A parent leaving one benefit band can keep none of it, and sometimes less than none.
Research from the Urban Institute and the Brookings Institution finds the highest effective marginal rates in the country fall not on the wealthy but on low and moderate income households moving up. The people most told to just take the promotion are the ones the math punishes for it.
What can be done
There are fixes, at the policy level and for you today
None of this is inevitable. It comes from limits that were never lined up, so lining them up is the fix. Several approaches already exist and are used in some states:
These are neutral descriptions of tools already in use, not a recommendation. Which ones a state adopts is a policy choice.
For your own situation today, there is one lever you may control. Money you put into an HSA or a pre-tax 401(k) lowers the income figure benefits are measured against, which can keep you under a limit while still building savings. The calculator has an Advanced levers panel where you can try this against your own numbers.