The IRS has said (https://www.irs.gov/tax-professionals/aca-information-center-for-tax-professionals) that it will not accept electronically filed returns for processing during the 2018 filing season (2017 returns) if the taxpayer fails to comply with the individual mandate. This means doing any of the following:
The IRS did not do this for 2016 returns. However, as it reviews 2016 returns that have been filed, it may send letters to taxpayers who did not indicate they had coverage, were exempt, or paid the penalty.
Advance payment of current tax liability based either on wage withholdings or installment payments of your estimated tax liability. To avoid penalties, you generally must pay to the IRS either 90% of your final tax liability, or either 100% or 110% of the prior year’s tax liability, depending on your adjusted gross income.