benefits

A raise can never lower your take-home pay — that's the reassuring truth of the tax-bracket lesson, because only the new dollars are taxed at the higher rate. But take-home isn't the whole picture. A working family's net resources are take-home pay PLUS the means-tested benefits they qualify for: Medicaid or CHIP, an ACA premium subsidy, childcare assistance, SNAP, and refundable credits like the Earned Income Tax Credit. Many of those benefits are tied to an income limit, and some cut off all at once at a hard line — a 'cliff.' Cross it by a single dollar and the whole benefit vanishes, so a modest raise can leave a family with thousands less than before. The chart plots net resources against gross income: normally the line climbs, but at a cliff it drops, opening a 'trap zone' of incomes where earning more leaves you worse off, until your pay finally climbs back over the lost benefit. The number that exposes the myth is the effective marginal rate on a raise — and at a cliff it rockets past 100%, meaning the raise takes more than it gives. The opposite extreme also shows up: deep in the EITC phase-in, a raise is effectively subsidized, an effective rate below zero. The durable lessons: judge a money decision on net resources, not just salary; the most dangerous phase-outs are the abrupt ones; and the fix is almost never to turn down a raise — it's to leap well past the cliff, and for policy to taper benefits gradually instead of cutting them at a line.

Once a year, open enrollment hands nearly every employee with job-based coverage the same confusing menu: a High-Deductible Health Plan (HDHP), which charges a low monthly premium but leaves you paying the first several thousand dollars of care yourself, or a PPO, which charges a much higher premium for a much lower deductible. Almost nobody models the trade-off; they guess, or copy last year's choice. This lesson turns it into arithmetic: both plans are a premium you always pay plus a deductible you pay only if you get sick, and the total cost of each is a simple function of how much care you use this year. The simulator sweeps that one number — your expected annual medical spending — and plots each plan's total cost, which rises linearly and then goes flat once you've hit the deductible (the plan's effective ceiling on what you owe). The two ahas: low, predictable spenders win on the HDHP, because its lower premium dominates when you rarely touch the deductible; heavy, predictable spenders can win on the PPO, because once both plans max out, the PPO's lower deductible can beat the HDHP's much higher one even after its one real edge — the HSA. An HDHP is the only plan of the two that unlocks a Health Savings Account, which lets the deductible you do pay come out of pre-tax dollars, a discount a PPO's spending never gets. At the default numbers ($150/mo, $4,500 deductible HDHP vs. $350/mo, $750 deductible PPO, 22% tax rate), the two plans break even at about $4,038 of yearly spending — below that, the HDHP wins; above it, the PPO does. The durable lesson: pick a health plan by looking at what you actually spent on care last year (or expect to this year), not by the sticker premium alone.