Key numbers to know when filing your 2012 tax returns, according to the Internal Revenue Service:

PERSONAL EXEMPTION:

¥ Each personal or dependent exemption is worth $3,800.

STANDARD DEDUCTION:

¥ $11,900 for married couples filing a joint return, and qualifying widows and widowers

¥ $5,950 for singles and married individuals filing separate returns

¥ $8,700 for heads of household

¥ Taxpayers who are 65 or older or who are blind may be eligible for a higher standard deduction.

ALTERNATIVE MINIMUM TAX THRESHOLD:

¥ $78,750 for a married couple filing a joint return, and qualifying widows and widowers

¥ $50,600 for singles and heads of household

INCOME TAX BRACKETS:

¥ 10 percent, 15 percent, 25 percent, 28 percent, 33 percent, 35 percent

EARNED INCOME TAX CREDIT:

To qualify income can be no greater than:

¥ $45,060 ($50,270 married filing jointly) with three or more qualifying children

¥ $41,952 ($47,162 married filing jointly) with two qualifying children

¥ $36,920 ($42,130 married filing jointly) with one qualifying child

¥ $13,980 ($19,190 married filing jointly) with no qualifying children

Investment income cannot be more than $3,200 or less for the year.


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Maximum credit:

¥ $5,891 with three or more qualifying children

¥ $5,236 with two qualifying children

¥ $3,169 with one qualifying child

¥ $475 with no qualifying children

CAPITAL GAINS:

¥ 0 percent if taxed in the 10 percent or 15 percent brackets

¥ 15 percent top rate if taxed in higher brackets

ESTATE TAX:

¥ Taxed at a top rate of 35 percent in 2012, with the first $5.12 million in value exempted for individual estates and $10.24 million for family estates

IRA CONTRIBUTIONS:

¥ Traditional IRA contribution limit: $5,000

¥ Additional contribution if over 50: $1,000

DEFERRED RETIREMENT ACCOUNTS

¥ 401(k), 403(b),: $17,000

¥ Additional contribution if 50 or older: $5,500

STANDARD MILEAGE RATES:

Business use

¥ 55.5 cents a mile

Medical reasons or qualified move

¥ 23 cents a mile

Charitable purposes

¥ 14 cents a mile