SAN ANTONIO – Tuesday, April 18, is tax day.

If you're among the 40 million Americans the IRS said hasn't filed yet, you have until midnight.

The tax filing deadline is late this year because April 15 fell on a Saturday and Monday was a local holiday in Washington, DC.

San Antonio’s postmaster said most post offices will not stay open late to accept those last minute returns.

However, two locations will have late collections: Midnight at the General Mail Facility on Perrin Beitel Road and 10 p.m. at the Airport Post Office on John Saunders.