Your 2019 Massachusetts Form 1 is due on or before April 15, 2021.
Automatic Extensions (for filing, payment is due April 15 to avoid penalty and interest)
All taxpayers filing personal income tax returns are automatically granted a six-month extension of time to file their tax return as long as at least 80% of the total amount of tax ultimately due on or before the due date prescribed for payment of the tax has been paid. See TIR 16-10.
Also, if you are making a payment of $5,000 or more, you are required to submit your extension payment electronically. Failure to do so will result in a penalty. If you are making a payment of less than $5,000, you also have the option of filing your extension electronically.
If there is a tax due with your extension, payment can be made through Electronic Funds Withdrawal