ACA Subsidies Explained: How to Maximize Your Savings

Two different kinds of help

Most people know about one form of ACA assistance. There are actually two, and confusing them costs real money.

Premium tax credits reduce your monthly premium. Cost-sharing reductions (CSRs) reduce your deductible, copays and out-of-pocket maximum, and they are only available if you enroll in a Silver plan.

How the premium tax credit is calculated

The credit is not a fixed percentage off. It is calculated as the difference between:

• The cost of the second-lowest-cost Silver plan in your area (the "benchmark" plan), and
• The amount the law says you should have to contribute, based on your household income and size.

The credit amount is then fixed, and you can apply it to any metal tier you like.

This has an important consequence: because the credit is pegged to the benchmark Silver plan, when Silver premiums rise in your area your credit rises too, which can make Bronze plans very cheap, and sometimes free.

Why Silver deserves a second look

If your household income is under 250% of the federal poverty level, choosing Silver unlocks cost-sharing reductions. These quietly upgrade the plan's actuarial value. A Silver plan with strong CSRs can end up with better cost-sharing than a Gold plan, at a Silver price.

Many people default to Bronze because the premium looks lowest, and then discover a $7,000 deductible during a hospital stay. If you qualify for CSRs, Bronze is very often the wrong answer.

Estimating income when your income varies

Subsidies are based on your expected income for the coverage year, not last year's. For self-employed and commission-based workers, this is an estimate.

Estimate carefully and honestly:

• Underestimate your income and you may have to repay part of the credit at tax time.
• Overestimate and you pay more each month than necessary, receiving the balance back as a refund.

Report income changes to the Marketplace during the year rather than waiting. It adjusts your credit going forward and reduces any surprise at filing.

What counts as income

Modified Adjusted Gross Income includes wages, self-employment income, unemployment compensation, Social Security retirement benefits, interest and dividends. It does not include Supplemental Security Income, child support received, or most gifts.

Certain deductions reduce MAGI, notably contributions to a traditional IRA or a Health Savings Account, and the self-employed health insurance deduction. For households near a subsidy threshold, these can be worth real money.

Before you enroll

• Estimate household income for the coverage year
• Check whether you fall under 250% FPL, which makes Silver compelling
• Compare after-subsidy costs, not sticker premiums
• Confirm your doctors and medications are covered
• Plan to report income changes as they happen