Medicaid vs. Marketplace Plans: Where the Income Boundary Falls

The Income Line That Splits Two Programs

The dividing line between Medicaid and marketplace coverage is essentially a number: 138% of the federal poverty level (FPL). In states that expanded Medicaid under the Affordable Care Act, adults earning up to that threshold qualify for Medicaid. Earn a single dollar more, and you're in marketplace territory — eligible for premium tax credits instead.

For 2024, 138% FPL works out to roughly $20,120 for a single adult and about $34,307 for a family of three. Those figures shift slightly each year when the federal government updates poverty guidelines, usually in early spring.

But the dollar amount is only part of the story. Where you live changes the entire equation. Forty states plus Washington D.C. have adopted Medicaid expansion. In those places, the 138% threshold applies to most non-elderly adults. In the remaining ten states — including Texas, Florida, and Georgia — Medicaid for working-age adults is still tied to older, much stricter rules. A 35-year-old without dependents can earn almost nothing and still not qualify for Medicaid in a non-expansion state.

That gap matters a lot in practice. If you're in a non-expansion state and earn between roughly 100% and 138% FPL, you're caught in what's called the coverage gap — too much income for state Medicaid, not enough for marketplace subsidies (which in most states start at 100% FPL). The American Rescue Plan temporarily addressed some of this, but the structural gap remains in non-expansion states. See our Medicaid eligibility overview for a full breakdown of state-by-state rules.

How Each Program Actually Works

Understanding the mechanics of each program makes the choice — or the assignment, since eligibility isn't really optional — much clearer.

Medicaid

Medicaid is a joint federal-state program. The federal government sets minimum standards and contributes funding; each state administers the program, sets additional rules, and determines what it covers beyond federal minimums. That's why Medicaid in California looks quite different from Medicaid in Mississippi, even though both programs exist.

Key traits of Medicaid:

• No monthly premiums in most states for expansion-eligible adults (a few states charge modest premiums for higher-income enrollees)
• Very low or no cost-sharing — copays, if any, are typically capped at a few dollars
• Year-round enrollment — you can apply any time, not just during open enrollment
• Managed care delivery in most states, meaning you're assigned to or choose a managed care organization (MCO) with a defined network
• Retroactive coverage possible in some states, covering bills from up to three months before your application

ACA Marketplace Plans

Marketplace plans are private insurance policies sold through HealthCare.gov or a state-run exchange. If your income qualifies, the government reduces your premium through an advance premium tax credit (APTC) paid directly to your insurer.

Key traits of marketplace plans:

• Monthly premiums apply, even with subsidies — the credit offsets the cost but rarely eliminates it entirely
• Annual deductibles and out-of-pocket maximums vary by metal tier (Bronze, Silver, Gold, Platinum)
• Open enrollment window runs roughly November through January; outside that, you need a qualifying life event for a Special Enrollment Period
• Cost-sharing reductions (CSRs) available on Silver plans for those earning between 100% and 250% FPL — these lower deductibles and copays significantly
• Broader networks in many cases, though this varies by plan and insurer

One thing worth flagging: if you're eligible for Medicaid, the marketplace will route you there even if you'd prefer a private plan. You can't collect a marketplace subsidy if you qualify for Medicaid. The programs don't stack.

What Counts as Income for Eligibility Purposes

Both programs use Modified Adjusted Gross Income (MAGI) to determine eligibility, but people trip over what actually counts. MAGI for health coverage purposes includes:

• Wages, salary, tips
• Self-employment net income
• Unemployment compensation
• Social Security benefits (if taxable)
• Alimony received (for pre-2019 divorces)
• Capital gains, dividends, rental income

It does not include things like child support received, gifts, or workers' compensation. Roth IRA distributions generally don't count either, which surprises some early retirees.

Household size is equally important. The FPL thresholds scale up with each additional person in your tax household. A family of four has a Medicaid cutoff around $41,952 in an expansion state — roughly double what it is for a single person. Two adults with the same combined income can land in different programs based purely on whether their kids live with them and how their tax filing is structured.

Because income estimation is so critical, it pays to be thoughtful rather than rough. See why your estimated income matters during marketplace enrollment for a detailed look at how getting the number wrong affects your subsidy and your April tax bill.

Living Near the Boundary: What Happens When Income Moves

The income cutoff isn't a one-time determination. If your income bounces around — as it does for freelancers, gig workers, seasonal employees, and small-business owners — you may cross the Medicaid/marketplace boundary multiple times in a year.

Here's how it plays out in practice:

Medicaid to Marketplace

If you're on Medicaid and your income rises above 138% FPL, you lose Medicaid eligibility. You'll have a 60-day Special Enrollment Period to pick a marketplace plan. During that window, you're not uninsured — Medicaid covers you until your new plan starts, as long as you act quickly. Miss that window, and you'll wait until the next open enrollment period.

What happens to Medicaid coverage when your income goes up walks through the exact steps to make that transition without gaps.

Marketplace to Medicaid

If your income drops below the Medicaid threshold while you're enrolled in a marketplace plan, you should report it. The marketplace will determine you're Medicaid-eligible and route you to your state's program. Your marketplace plan doesn't automatically end immediately, but you'll need to coordinate the switch to avoid paying premiums for coverage you don't need.

In both directions, the key rule is: report changes promptly. The marketplace application asks you to update income changes within 30 days of a significant shift. Waiting creates subsidy mismatches and potential repayment headaches. See when and how to update your marketplace application for income changes for a practical walkthrough.

Families With Mixed Eligibility

In households where different members earn or are counted differently, it's entirely possible — and quite common — for some family members to be on Medicaid while others are on a marketplace plan or CHIP.

A typical scenario: two adults file jointly, combined income at 175% FPL. In an expansion state, that's above the Medicaid cutoff for adults, so both parents enroll in a marketplace plan. Their two children, however, are covered separately under CHIP (Children's Health Insurance Program), which has a higher income cutoff — often up to 200% or even 300% FPL depending on the state.

The marketplace application handles this automatically. When you enter household members and income, the system evaluates each person and routes them to the appropriate program. You don't have to sort it out manually. What you do need is accurate information about every household member's income and tax filing status.

For a fuller picture of how these programs interact within families, CHIP, Medicaid, and the Marketplace: Sorting Out Coverage for Families explains the overlapping rules in plain terms.

One nuance worth knowing: if a parent is on Medicaid and a child is on a marketplace plan (or vice versa), the family has two different insurance cards, two different networks, and potentially two different primary care relationships. That's manageable, but it helps to be aware of it before you need care.

Costs Side by Side: What You're Actually Paying

The financial difference between Medicaid and a subsidized marketplace plan can be significant, especially for someone hovering right around the income cutoff. Let's run a concrete comparison for a single adult earning exactly at 138% FPL in an expansion state.

On Medicaid

• Monthly premium: $0 (in most expansion states)
• Primary care visit copay: $0–$4
• Generic prescription: $1–$3
• Annual deductible: $0 in most cases

On a Marketplace Silver Plan (100%–150% FPL)

• Monthly premium after APTC: often $0–$10 (enhanced subsidies available under current law)
• Primary care visit copay: $5–$30 depending on cost-sharing reductions
• Generic prescription: $3–$15
• Annual deductible: $0–$500 on Silver plans with maximum CSRs (87% or 94% actuarial value tiers)

At first glance, a heavily subsidized Silver plan can look comparable to Medicaid in cost — especially at the lowest income levels where CSRs bring cost-sharing way down. But there are real differences in how the benefits work day-to-day, and Medicaid tends to win on total out-of-pocket exposure for people with chronic conditions or frequent care needs.

Above 150% FPL, the comparison tilts more meaningfully. Deductibles on marketplace plans rise, and while premiums stay subsidized, cost-sharing grows. For someone at 200% FPL on a Bronze plan, a single hospital visit could mean a $1,500 deductible before coverage kicks in — nothing remotely like what Medicaid charges.

If you're weighing plan structures beyond the Medicaid/marketplace divide, it also helps to understand how networks work. Our HMO vs. PPO comparison covers the tradeoffs that apply to both marketplace and Medicaid managed care plans.

For a broader side-by-side on eligibility and benefits beyond what we cover here, see Medicaid vs. Marketplace Insurance: Which Is Right for Your Situation.