ANNAPOLIS, MD (AP) – Maryland’s tax collector announced an extension of tax filing and payment deadlines. Maryland business taxes and quarterly estimated income tax returns and payments that would be due in January, February, and March will not be due until April 15. Businesses and self-employed individuals or independent contractors with estimated income tax returns and payments due on Jan. 15 also will be granted an extension until April 15. While people will still have to pay their taxes, the comptroller says it adds up to around $1.5 billion in temporary relief.