How do I file a extension
If you do not owe anything, then filing your federal on the 16th will not be a problem. However, some states and localities do penalize for not filing on time.
File an extension
EXTENSION
https://turbotax.intuit.com/irs-tax-extensions/
https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-extension/need-file-extension-personal-state-taxes/L32Mt8ZNv_US_en_US?uid=m9a3q808