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IRS.gov Website
Publication 550
taxmap/pubs/p550-028.htm#en_us_publink100010758

Special Rules for
Traders in Securities(p71)

rule
Special rules apply if you are a trader in securities in the business of buying and selling securities for your own account. To be engaged in business as a trader in securities, you must meet all the following conditions.
The following facts and circumstances should be considered in determining if your activity is a securities trading business.
If your trading activities do not meet the above definition of a business, you are considered an investor, and not a trader. It does not matter whether you call yourself a trader or a "day trader."
Note.You may be a trader in some securities and have other securities you hold for investment. The special rules discussed here do not apply to the securities held for investment. You must keep detailed records to distinguish the securities. The securities held for investment must be identified as such in your records on the day you got them (for example, by holding them in a separate brokerage account).
taxmap/pubs/p550-028.htm#en_us_publink100010760

How To Report(p71)

rule
Transactions from trading activities result in capital gains and losses and must be reported on Form 8949 and Schedule D (Form 1040), as appropriate. Losses from these transactions are subject to the limit on capital losses explained earlier in this chapter.
taxmap/pubs/p550-028.htm#en_us_publink100010761

Mark-to-market election made.(p71)

rule
If you made the mark-to-market election, you should report all gains and losses from trading as ordinary gains and losses in Part II of Form 4797, instead of as capital gains and losses on Form 8949 and Schedule D (Form 1040). In that case, securities held at the end of the year in your business as a trader are marked to market by treating them as if they were sold (and reacquired) for fair market value on the last business day of the year. But do not mark to market any securities you held for investment. Report sales from those securities on Form 8949 and Schedule D (Form 1040), as appropriate, not Form 4797. See the Instructions for Form 8949 and Instructions for Schedule D (Form 1040).
taxmap/pubs/p550-028.htm#en_us_publink100010762

Expenses.(p71)

rule
Interest expense and other investment expenses that an investor would deduct on Schedule A (Form 1040) are deducted by a trader on Schedule C (Form 1040), Profit or Loss From Business, if the expenses are from the trading business. Commissions and other costs of acquiring or disposing of securities are not deductible but must be used to figure gain or loss. The limit on investment interest expense, which applies to investors, does not apply to interest paid or incurred in a trading business.
taxmap/pubs/p550-028.htm#en_us_publink100010763

Self-employment tax.(p71)

rule
Gains and losses from selling securities as a trader are not subject to self-employment tax. This is true whether the election is made or not. For an exception that applies to section 1256 contracts, see Self-Employment Income earlier under Section 1256 Contracts Marked to Market.
taxmap/pubs/p550-028.htm#en_us_publink100010764

How To Make the
Mark-to-Market Election(p71)

rule
To make the mark-to-market election for 2013, you must file a statement with your timely filed return for 2012 or with a properly filed request for extension of time to file (Form 4868, Application for Automatic Extension of Time To File U.S. Individual Income Tax Return) on or before the normal due date of the return. The statement must include the following information.
If you are not required to file a 2012 income tax return, you make the election by placing the above statement in your books and records no later than March 15, 2013. Attach a copy of the statement to your 2013 return.
If your method of accounting for 2012 is inconsistent with the mark-to-market election, you must change your method of accounting for securities under Revenue Procedure 2011-14 (or its successor) available at www.irs.gov/irb/2011-04_IRB/ar08.html. Revenue Procedure 2011-14 requires you to file Form 3115, Application for Change in Accounting Method. Follow its instructions. Enter "64" on line 1a of the Form 3115.
Once you make the election, it will apply to 2013 and all later tax years, unless you get permission from the IRS to revoke it. The effect of making the election is described under Mark-to-market election made, earlier.
For more information on this election, see Revenue Procedure 99-17, on page 52 of Internal Revenue Bulletin 1999-7 at
www.irs.gov/pub/irs-irbs/irb99-07.pdf.