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IRS.gov Website
Publication 334
taxmap/pubs/p334-003.htm#en_us_publink1000313194

Self-Employment (SE) Tax(p8)

rule
Self-employment tax (SE tax) is a social security and Medicare tax primarily for individuals who work for themselves. It is similar to the social security and Medicare taxes withheld from the pay of most wage earners.
EIC
If you earned income as a statutory employee, you do not pay SE tax on that income.
taxmap/pubs/p334-003.htm#en_us_publink1000313196

Social security coverage.(p8)

rule
Social security benefits are available to self-employed persons just as they are to wage earners. Your payments of SE tax contribute to your coverage under the social security system. Social security coverage provides you with retirement benefits, disability benefits, survivor benefits, and hospital insurance (Medicare) benefits.
EIC
By not reporting all of your self-employment income, you could cause your social security benefits to be lower when you retire.
taxmap/pubs/p334-003.htm#en_us_publink1000313198
How to become insured under social security.(p8)
You must be insured under the social security system before you begin receiving social security benefits. You are insured if you have the required number of credits (also called quarters of coverage), discussed next.
taxmap/pubs/p334-003.htm#en_us_publink1000313199
Earning credits in 2013 and 2014.(p8)
For 2013, you received one credit, up to a maximum of four credits, for each $1,160 ($1,200 for 2014) of income subject to social security taxes. Therefore, for 2013, if you had income (self-employment and wages) of $4,640 that was subject to social security taxes, you receive four credits ($4,640 ÷ $1,160).
For an explanation of the number of credits you must have to be insured and the benefits available to you and your family under the social security program, consult your nearest Social Security Administration (SSA) office.
EIC
Making false statements to get or to increase social security benefits may subject you to penalties.
taxmap/pubs/p334-003.htm#en_us_publink1000313201

The Social Security Administration (SSA) time limit for posting self-employment income.(p9)

rule
Generally, the SSA will give you credit only for self-employment income reported on a tax return filed within 3 years, 3 months, and 15 days after the tax year you earned the income. If you file your tax return or report a change in your self-employment income after this time limit, the SSA may change its records, but only to remove or reduce the amount. The SSA will not change its records to increase your self-employment income.
taxmap/pubs/p334-003.htm#en_us_publink1000313202

Who must pay self-employment tax.(p9)

rule
You must pay SE tax and file Schedule SE (Form 1040) if either of the following applies.
  1. Your net earnings from self-employment (excluding church employee income) were $400 or more.
  2. You had church employee income of $108.28 or more.
EIC
The SE tax rules apply no matter how old you are and even if you are already receiving social security or Medicare benefits.
taxmap/pubs/p334-003.htm#en_us_publink1000313204

SE tax rate.(p9)

rule
For 2013, the SE tax rate on net earnings is 15.3% (12.4% social security tax plus 2.9% Medicare tax).
taxmap/pubs/p334-003.htm#en_us_publink1000313205

Maximum earnings subject to SE tax.(p9)

rule
Only the first $113,700 of your combined wages, tips, and net earnings in 2013 is subject to any combination of the 12.4% social security part of SE tax, social security tax, or railroad retirement (tier 1) tax.
All your combined wages, tips, and net earnings in 2013 are subject to any combination of the 2.9% Medicare part of SE tax, social security tax, or railroad retirement (tier 1) tax.
If wages and tips you receive as an employee are subject to either social security or railroad retirement (tier 1) tax, or both, and total at least $113,700, do not pay the 12.4% social security part of the SE tax on any of your net earnings. However, you must pay the 2.9% Medicare part of the SE tax on all your net earnings.
Tax Tip
Deduct one-half of your SE tax as an adjustment to income on line 27 of Form 1040.
taxmap/pubs/p334-003.htm#en_us_publink1000313207

More information.(p9)

rule
For information on methods of calculating SE tax, see Chapter 10, Self-Employment Tax.
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Table 1-2. Which Forms Must I File?

IF you are liable for:THEN use Form:DUE by:1
Income tax1040 and Schedule C or C-EZ215th day of 4th month after end of
tax year.
Self-employment taxSchedule SEFile with Form 1040.
Estimated tax1040-ES15th day of 4th, 6th, and 9th months of tax year, and 15th day of 1st month after the end of tax year.
Social security and Medicare taxes and income tax withholding941 or 944April 30, July 31, October 31, and January 313.
  See Publication 15.
Providing information on social security and Medicare taxes and income tax withholdingW-2 (to employee)

W-2 and W-3 (to the Social Security Administration)
January 313.

Last day of February (March 31 if filing electronically)3.
Federal unemployment (FUTA) tax940January 313.
  April 30, July 31, October 31, and January 31, but only if the liability for unpaid tax is more than $500.
Filing information returns for payments to nonemployees and transactions with other personsSee Information ReturnsForms 1099 – to the recipient by January 31 and to the IRS by February 28 (March 31 if filing electronically).
  Other forms – see the General Instructions for Certain Information Returns.
Excise taxSee Excise TaxesSee the instructions to the forms.
1 If a due date falls on a Saturday, Sunday, or legal holiday, file by the next day that is not a Saturday, Sunday, or legal holiday. For more information, see Publication 509, Tax Calendars.
2 File a separate schedule for each business.
3 See the form instructions if you go out of business, change the form of your business, or stop paying wages.