If I’ve not filed taxes in a prior year, how will the Marketplace determine my income?

If the IRS cannot provide income data to the marketplace, and (in applicable states) if alternative sources also fail to furnish this income information, the Marketplace must accept your attestation of your household income. If official data sources are used to verify your income, and your estimate and official records don’t match but you meet all other eligibility requirements, you will be asked to provide documentation to support your income projections. If you don’t have that documentation handy, the Marketplace will provide premium tax credits for up to 150 days while you gather and submit your documentation for verification. (45 C.F.R. §§ 155.315(f) 155.320(c).)