Key Numbers to Know for Filing 2013 Tax Returns Numbers to know when filing your 2013 tax returns, according to the Internal Revenue Service: Each personal or dependent exemption is worth $3,900. $12,200 for married couples filing a joint return, and qualifying widows and widowers. $6,100 for singles and married individuals filing separate returns. $8,950 for heads of household. Taxpayers who are 65 or older or who are blind may be eligible for a higher standard deduction. Begins at $250,000 for individuals, $275,000 for heads of household, $300,000 for married filing jointly. $80,800 for a married couple filing a joint return, and qualifying widows and widowers. $51,900 for singles and heads of household. 10 percent, 15 percent, 25 percent, 28 percent, 33 percent, 35 percent, 39.6 percent. To qualify income can be no greater than: $46,227 ($51,567 married filing jointly) with three or more qualifying children. $43,038 ($48,378 married filing jointly) with two qualifying children. $37,870 ($43,210 married filing jointly) with one qualifying child. $14,340 ($19,680 married filing jointly) with no qualifying children. Investment income cannot be more than $3,300 for the year. Maximum credit $6,044 for taxpayers filing jointly who have 3 or more qualifying children. $5,372 with two children. $3,250 with one child. $487 with no children. 0 per cent if taxpayer is in the 10 percent or 15 percent income tax brackets. 15 percent top rate if taxed below the 39.6 percent rate. 20 percent if taxed at the 39.6 percent rate. Exclusion of $5.25 million for individual estates of people who died in 2013. Traditional IRA contribution limit: $5,500. Additional contribution if over 50: $1,000. Additional contribution if 50 or older: $5,500. Business use: 56.5 cents a mile. Medical reasons or qualified move: 24 cents a mile. Charitable purposes: 14 cents a mile.