If you missed the April 18, 2016 tax filing deadline, you should take action now to file your return and pay any taxes owed to avoid penalties and stop interest from accruing. The IRS offers free filing options for most taxpayers, including Free File for those with income under $62,000 and Fillable Forms for higher incomes. You can also request an installment agreement if you cannot pay your full tax balance now. Filing your return ensures you receive any refund owed.