When completing an Affordable Care Act (ACA) application, many clients get stuck at the “household income” section. With ever-changing rules and confusing definitions, it’s easy for them to feel overwhelmed — and for you as their agent, it can seem intimidating if you’re not used to crunching numbers.
But don’t worry — this guide breaks down exactly how you can walk clients through estimating their household income and help them avoid complications later on if their income changes.
Step 1: Gather the Right Information
Before starting, make sure your client has a few key items ready:
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Their most recent federal tax return
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Basic details about everyone in their household
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A realistic estimate of what their income will look like in the coming year
These details form the foundation for a proper income estimate.
Step 2: Identify All Household Members
A “household” includes:
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The tax filer
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Their spouse (if legally married)
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Any tax dependents they claim
Even if someone listed doesn’t need health coverage, they still count as part of the household.
Some situations — like children in shared custody, foster children, or roommates — can be tricky. Encourage clients to review HealthCare.gov’s guidance to clarify who should be included in their household count.
Step 3: Estimate the Household’s Taxable Income
Marketplace applications ask for projected income for the upcoming year, not last year’s income. Clients must provide both their current monthly income and their expected annual total.
Use the following information to estimate their Modified Adjusted Gross Income (MAGI):
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Adjusted gross income (from their tax return)
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Wages, tips, and unemployment income
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Excluded foreign income
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Non-taxable Social Security benefits
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Tax-exempt interest
This total determines their eligibility for premium tax credits and cost-sharing reductions.
If requested, clients should be ready to verify their income by submitting documentation such as pay stubs, tax forms, or a Letter of Explanation. Remember that the Marketplace considers the income of all household members — even those who aren’t enrolling in coverage.
For clients with variable or seasonal income, report their current earnings and remind them they can update it later if their situation changes.
Step 4: Report Any Changes Promptly
If a client experiences a major change in income or household size, encourage them to update their application right away. These updates ensure they continue receiving the correct amount of savings — and prevent unexpected tax bills later.
Even after enrollment, clients should review and report changes throughout the year.
When Income Increases
If a client starts earning more or a household member moves out, help them report it. Higher income could reduce their subsidy amount, and failing to update it could lead to repayment when they file taxes.
When Income Decreases
If income drops or a new household member joins, updating the application could unlock more savings — including eligibility for Medicaid or CHIP, depending on your state’s rules.
Some states have expanded Medicaid programs, so check your state’s guidelines at Medicaid.gov to confirm eligibility.
Step 5: Updating the Application
For clients using a State-Based Marketplace (SBM), updates must be made through their state’s marketplace website.
Clients using the Federal Marketplace (FFM) can update their information:
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Online at HealthCare.gov
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By calling the Marketplace Call Center at 1-800-318-2596 (TTY: 1-855-889-4325)
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Or in person with your help as their agent
Online update steps:
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Log in to their HealthCare.gov account
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Select their existing application
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Choose “Report a Life Change”
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Follow the prompts to report income, household, or address changes
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Review the new eligibility results and, if necessary, re-enroll in their plan
Step 6: Using HealthSherpa for Agents
If you enroll clients through HealthSherpa, you can easily submit updates and store documents securely in one place.
To report a change in HealthSherpa:
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Log in to your agent dashboard
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Search for the client and select their name
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Click “Report Changes”
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Update the application and download new eligibility results
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Confirm and finalize enrollment
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Indicate how much of the client’s tax credit they want to use and select Enroll
If you run into errors, review HealthSherpa’s CMS System Changes updates for alternative submission options.
Step 7: Avoiding Common Errors
The most frequent issue agents see is a data matching error — when the income the client reports doesn’t match the marketplace’s estimate. To minimize this:
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Double-check that all income sources are reported
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Ensure all fields are complete
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Help clients provide accurate future income projections
This prevents coverage delays or loss of premium tax credits later.
Step 8: Submitting Required Documents
If clients don’t upload their income verification documents by the required deadline, they could lose their coverage or subsidy eligibility. Deadlines appear in the Marketplace notice or in their online account.
File upload rules:
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Accepted formats: .pdf, .jpeg, .png, .tiff, .gif, .xml, .bmp
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File size limit: 10MB
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No special characters in file names
Per the 2025 ACA Final Rule, marketplaces must now verify income more strictly:
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There’s no longer an automatic 60-day extension after the initial 90-day grace period.
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Failure to file a federal tax return for one year can result in loss of tax credits.
Encourage clients to stay on top of their documentation and file returns on time to keep their coverage and savings.
Final Thoughts
Accurate income estimates are key to ensuring your clients receive every dollar of savings they’re entitled to. With these updated guidelines and tools, you can confidently guide them through the process and prevent headaches down the road.
Not affiliated with or endorsed by Medicare or any government agency.
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