It depends on other factors on your MA return. There is no penalty on the federal return, but Massachusetts does penalize taxpayers for not having health insurance, but not everyone will be subjected to the penalty. It sounds like March was the only month you had a lapse.
You'll only be penalized for lacking insurance if you can afford to get health insurance but didn't. The penalties vary depending upon your income, age, and family size. Penalties can be no more than half the lowest-priced plan available to an individual through the Connector Care health insurance.
The individual mandate penalty applies only to adults who can afford health insurance. If according to the state affordability schedule, you have no affordable options, you won't be penalized. There's no penalty if your income is at or below 150% of the federal poverty level because there is no premium and therefore no penalty. See the guidelines regarding the tax penalties for not having health insurance.
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