Form 1040 (Schedule D). Capital Gains And Losses: Fill & Download for Free

First do you have your Form 3921 for 2013 or do you know the correct amounts? If not, you will need to contact your employer for the correct amount.Do you know how much your gain or loss resulted from your Stock? You should file a Form 1040X and file your capital gains on Schedule D, Capital Gains and Losses. On page 2 of Schedule D, you will calculate your capital gains tax. where indicated to access the calculation worksheet. Your tax on Form 1040, line 44, includes the total of your ordinary income tax and capital gains tax.When filing an amended or corrected return:Include copies of any forms and/or schedules that you're changing or didn't include with your original return. Generally, for a credit or refund, you must file Form 1040X within 3 years after the date you timely filed your original return or within 2 years after the date you paid the tax, whichever is later.Allow the IRS up to 16 weeks to process the amended return.It is possible that if the income was substantial you may have or will receive a CP 2000 for unreported income. If you have received this, then your corrections may have already been made.FYI: the Statute of Limitations for TY 2013 is ending 04/15/2017 which means you may owe tax but any refunds of credit. If your return wasn't filed by the due date (including extensions of time to file):You may be subject to the failure to file penalty, unless you have reasonable cause for your failure to file timely.Tax not paid in full by the original due date of the return (regardless of extensions of time to file) may also result in the failure to pay penalty, unless you have reasonable cause for your failure to pay timely, or the IRS has approved your application Form 1127 (PDF), Application for Extension of Time for Payment of Tax Due to Undue Hardship).Interest is charged on taxes not paid by the due date, even if you have an extension of time to file, and is also charged on penalties.There's no penalty for failure to file if you're due a refund. However, you risk losing a refund altogether if you file a return or otherwise claim a refund after the statute of limitations has expired. An original return claiming a refund must be filed within 3 years of its due date for a refund to be allowed in most instances. After the expiration of the three-year period, the refund statute prevents the issuance of a refund check and the application of any credits, including over-payments of estimated or withholding taxes, to other tax years that are underpaid. However, the statute of limitations for the IRS to assess and collect any outstanding balances doesn't start until a return has been filed. In other words, there's no statute of limitations for assessing and collecting the tax if no return has been filed.Hope this information is helpful.