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A data match issue means the Marketplace is not able to verify the information on your application based on the data it has available to them.
When this happens, healthcare.gov will temporarily determine that you are eligible for tax credits, based on the income that you attested you expect to earn next year. But it will require you to send additional documentation. People are typically given 90 days to submit documentation. If you need an extension past the 90 day period, the Marketplace will give you another 60 day extension. If you do not submit documentation, the Marketplace may reduce or terminate your tax credit amount.
If you have problems with a data match inconsistency on healthcare.gov, contact the Marketplace call center at 1-800-318-2596 or contact a navigator for help. Contact information for navigators and other assisters in healthcare.gov states is available at Find Local Help.