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If you are under full retirement age (ages 66-67 depending on date of birth) for the entire year, SSA deducts $1 from your benefit payments for every $2 you earn above the annual limit. For 2013, that limit is $15,120.
In the year you reach full retirement age, SSA deducts $1 in benefits for every $3 you earn above a different limit, but SS only counts earnings before the month you reach your full retirement age. If you will reach full retirement age in 2013, the limit on your earnings for the months before full retirement age is $40,080.
Starting with the month you reach full retirement age, you can get your benefits with no limit on your earnings.

In 2013 wages up to $113,700 are subject to social security tax and the maximum social security withholding would be $7049.40.
Employers should withhold Social Security taxes (6.2 percent) from employee's wages up to $113,700 and withhold Medicare tax (1.45 percent) on all wages.
In 2012 wages up to $110,100 are subject to social security tax and the maximum social security withholding would be $6826.20.
Employers should withhold Social Security taxes (4.2 percent) from employee's wages up to $110,100 and withhold Medicare tax (1.45 percent) on all wages.

Generally, if your provisional income is more than a base amount, the difference is taxable,
Generally, Provisional income = total income plus half your social security received plus tax exempt interest minus certain adjustments.
The base amount is $25,000 for filing status of single, head of household, widower and married filing separately.
The base amount is $32,000 for filing status of married filing jointly.

If your birth year is:
1943-1954 the your full retirement age is 66
1955 the your full retirement age is 66 and 2 months
1956 the your full retirement age is 66 and 4 months
1957 the your full retirement age is 66 and 6 months
1958 the your full retirement age is 66and 8 months
1959 the your full retirement age is 66 and 10 months
1960 and after the your full retirement age is 67

If your tax bracket = 10% or 15%, the Short Term Capital Gain is taxed at ordinary income rates, Long Term Capital Gains and Qualifying Dividends tax rate = 0%
If tax bracket = greater than 15%, the Short Term CG taxed at ordinary rates Long Term CG and Qualifying Dividends tax rate = 15%
For 2013: ATRA, extends the current capital gains and dividends rates on income at or below $400,000 (individual filers), $425,000 (heads of households), and $450,000 (married filing jointly) for tax years beginning after December 31, 2012.
For income in excess of $400,000 (individual filers), $425,000 (heads of households) and $450,000 (married filing jointly), the rate for both capital gains and dividends is 20 percent. .

If tax bracket = 10% or 15% the Short Term CG taxed at ordinary rates Long Term CG and Qualifying Dividends tax rate = 0% If tax bracket = greater than 15% the Short Term CG taxed at ordinary rates Long Term CG and Qualifying Dividends tax rate = 15%

IRA Contributions $5,000
IRA Catch-up Contributions $1,000
Defined Benefit Plan Benefit $200,000
Defined Contribution Plan Allocation $50,000
401(K) or 403(b) Salary reduction deferrals $17,000
401(k) or 403(b) Catch-up Contributions $5,500
SIMPLE plans $11,500
SIMPLE plan Catch-up Contributions $2,500
Salary for pension plan $250,000
Salary for highly compensated employee $115,000
Salary for Key employee $165,000
Salary for SEP eligibility $550
Social Security Taxable Wage base $110,100

Annual Federal Gift Tax Exclusion = $14,000
Lifetime Federal Gift Tax Exclusion = $5,250,000
Lifetime GST Tax Exemption = $5,250,000
Important NOTE is that State exclusions may be different from above Federal amounts.

For 2013:
The Tax between 0 and 8,925 = 10%,
between $8,925 and $36,250 the Tax = 870 plus 15% over 8,925,
between $36,250 and $87,850 the Tax = 4,868 plus 25% over 36,250,
between $87,850 and $183,250 the Tax = 17,443 plus 28% over 87,850,
between $183,250, and $398,350 the Tax = 43,843 plus 33% over 183,250,
between $398,350, and $400,000 the Tax = 43,843 plus 33% over 398,350 over $400,000 the Tax = 116,163.75 plus 39.6% over 400,000.
For 2012:
The Tax between 0 and 8,700 = 10%,
between $8,701 and $35,350 the Tax = 870 plus 15% over 8,700,
between $35,351 and $85,650 the Tax = 4,868 plus 25% over 35,350,
between $85,651 and $178,650 the Tax = 17,443 plus 28% over 85,650,
between $178,651, and $388,350 the Tax = 43,843 plus 33% over 178,650,
over $388,351 the Tax = 112,863 plus 35% over 388,350.

For 2016:
The Tax between 0 and $13,250 = 10%,
between $13,251 and $50,400 the Tax = 1,325 plus 15% over 13,250
between $50,400 and $130,150 the Tax = 6,897.50 plus 25% over 50,400,
between $130,150 and $210,800 the Tax = 26,835 plus 28% over 130,150,,
between $210,800 and $413,850 the Tax = 49,417 plus 33% over 210,800
>between $413,350 and $441,000 the Tax = 116,258.50 plus 35% over 413,350
over $441 the Tax = 125,936 plus 39.6% over 441,000