UNDATED (KDAL) - Monday is the day your taxes are due and, as usual, many waited until the last minute to get them done. Tax experts say to double check figures before they are submitted since mistakes are more likely when you are rushed. If you can't finish on time, you can file for an extension by downloading form 4868. Even then, you need to make a best guess at what you owe the IRS and send it in or run the risk of paying a penalty. Electronic filing has pretty much done away with the last minute rush to are post offices.