Late Filing

1 After filing tax return - received additional tax documents 2 Can I pay my Federal Income Tax by credit card ? 3 Can the IRS assess additional tax for missing income from 5 years ago? 4 Can the IRS audit my tax return after 7 years has passed? 5 Exception to the Underestimated Tax Penalty for the current year 6 How is the IRS late filing penalty interest calculated ? 7 Is the tax return considered timely filed if received on the day it was postmarked or the day the IRS received it ? 8 Is there a penalty for the underpayment of taxes? 9 Late filing penalty - extension filed 10 Late penalty if expecting a refund and have not filed my tax return and the deadline has passed ? 11 Penalties and interest for paying and filing taxes after the due date 12 Should I file my tax return by April 15th, even if I can't pay? 13 What are the IRS Underpayment rates ? 14 What are the IRS Underpayment Rates for 2013 15 What happens if you can’t finish your tax return by its April 15th due date ? 16 When will the IRS accept a tax return as timely filed if mailed from overseas ? 17 Will the IRS ever waive penalties ?