The following table provides some important federal tax information for 2011, compared with 2010. Many of the dollar amounts are unchanged or have changed only slightly due to low inflation. Other amounts are changing due to legislation.

Social Security/ Medicare 2011 2010
Social Security Tax Wage Base $106,800.00 $106,800.00
Medicare Tax Wage Base No limit No limit
Employee portion of Social Security 4.2 percent 6.2 percent
Individual Retirement Accounts 2011 2010
Roth IRA individual, up to 100% of earned income $5,000.00 $5,000.00
Traditional IRA individual, up to 100% of earned income $5,000.00 $5,000.00
Roth and Traditional IRA additional annual "catch-up" contributions for account owners age 50 and older $1,000.00 $1,000.00
Qualified Plan Limits 2011 2010
Defined Contribution Plan Dollar limit on additions on sections 415 (c)(1)(A) $49,000.00 $49,000.00
Defined Benefit Plan limit on benefits (Section 415(b)(1)(A)) $195,000.00 $195,000.00
Maximum compensation used to determine contributions $245,000.00 $245,000.00
401(k), SARSEP, 403(b) Deferrals (Section 402(g)), & 457 deferrals (Section 457(b)(2)) $16,500.00 $16,500.00
401(k), 403(b), 457 & SARSEP additional "catch-up" contributions for employees age 50 and older $5,500.00 $5,500.00
SIMPLE deferrals (Section 408 (p)(2)(A)) $11,500.00 $11,500.00
SIMPLE additional "catch-up" contributions for employees age 50 and older $2,500.00 $2,500.00
Compensation defining highly compensated employee (Section 414(q)(1)(B)) $110,000.00 $110,000.00
Compensation defining key employee (officer) $160,000.00 $160,000.00
Compensation triggering Simplified Employee Pension contribution requirement (Section 408(k)(2) (c) $550.00 $550.00
Driving Deductions 2011 2010
Business mileage, per mile 51 cents 50 cents
Charitable mileage, per mile 14 cents 14 cents
Medical and moving, per mile 19 cents 16.5 cents
Business Equipment 2011 2010
Maximum Section 179 deduction $500,000.00 $500,000.00
Phaseout for Section 179 $2 million $2 million
Transportation Fringe Benefit Exclusion 2011 2010
Monthly commuter highway vehicle and transit pass $230.00 $230.00
Monthly qualified parking $230.00 $230.00
Domestic Production Activities Deduction 2011 2010
Percent of qualifying business net income 9 percent (6% for oil and gas companies) 9 percent (6% for oil and gas companies)
Standard Deduction 2011 2010
Married filing jointly $11,600.00 $11,400.00
Single (and married filing separately) $5,800.00 $5,700.00
Heads of Household $8,500.00 $8,350.00
Personal Exemption 2011 2010
Amount $3,700.00 $3,650.00
Domestic Employees 2011 2010
Threshold when a domestic employer must withhold and pay FICA for babysitters, house cleaners, etc. $1,700.00 $1,700.00
Kiddie Tax 2011 2010
Net unearned income not subject to the "Kiddie Tax" $1,900.00 $1,900.00
Estate Tax 2011 2010
Federal estate tax exemption $5 million Repealed* (estates have the option of using the $5 million exemption for 2011)
Maximum estate tax rate 35 percent 0 percent * (Estates have the option of using the 35 percent tax rate for 2011)
Annual Gift Exclusion 2011 2010
Amount you can give each recipient $13,000.00 $13,000.00
Alternative Minimum Tax Exemption Amounts 2011 2010
Married filing jointly $74,450.00 $72,450.00
Single filers $48,450.00 $47,450.00
Married filing separately $37,225.00 $36,225.00
IRS Interest Rates 2011 (1st Quarter) 2010 (4th Quarter)
Tax overpayments 3 percent (2 percent for corporations; 0.5 percent for the part of corporate overpayments exceeding $10,000) 4 percent (3 percent for corporations; 1.5 percent for the part of corporate overpayments exceeding $10,000)
Tax underpayments 3 percent (5 percent for large corporations underpayments) 4 percent (6 percent for large corporations underpayments)

** Under a 2001 law, the estate tax exemption was gradually increased and the tax rate levied on estates decreased. For one year only in 2010, the estate tax was repealed.