Yes. If you do not file taxes, you are not eligible to receive premium tax credits. Also, if you are currently receiving premium tax credits and don't file a tax return, you will not be able to receive premium tax credits in the future. In order to continue receiving premium tax credits, you must file a tax return and reconcile any advance premium tax credits received using the appropriate IRS form, Form 8962. The marketplace will notify you when your coverage is renewed if you are not eligible for premium tax credits because you received premium tax credits in the past and did not file a tax return or failed to reconcile advanced premium tax credits using Form 8962. (26 C.F.R. § 1.36B-2; 45 C.F.R. § 155.305; CMS, Guidance on Annual Eligibility Redetermination and Re-enrollment for Exchange Coverage for 2018, July 13, 2017).