For federal taxes, https://www.irs.gov/businesses/small-businesses-self-employed/filing-past-due-tax-returns
doesn't say you can't. Be prepared to pay any penalties that might be owed, though the penalties aren't going to get any if you wait longer or get caught by the the IRS or other taxing authority (if you are also behind on your state taxes, the state(s) will want you to file too)
