A job-based health plan covering only the employee that costs 9.61% or less of the employee’s household income. If a job-based plan is “affordable,” and meets the “minimum value” standard, you're not eligible for a premium tax credit if you buy a Marketplace insurance plan instead.
To find out if your employer’s plan meets the affordability standard, ask your employer. You can also ask them to fill out the Employer Coverage Tool (PDF, 92 KB).