The tax rates for married filing separately are overall the highest individual rates. The effect is minimized, however, when the spouse’s incomes are nearly equal.
Other commonly costly areas when filing separately include:
• The credit for child and dependent care expenses will be eliminated in most cases
• The earned income credit cannot be taken
• The education credits and the tuition and fees deduction cannot be taken
• More of your Social security income and railroad retirement benefits will probably be taxable
• The retirement savings credit will be reduced or eliminated
• The capital loss deduction on a separate return is limited to $1,500
• The first-time home buyer credit is limited to $4,000 (for homes purchased from 1-1-09 to 5-01-10)
• The first-time home buyer credit for qualified buyers who already own a home is limited to $3250 (homes purchased after 11-06-09)
• The student loan interest deduction may not be taken
• The amount you can contribute to a Roth IRA will be limited or eliminated
• The exclusion for the Education Savings Bond Program cannot be taken
• The deduction for a contribution to your regular IRA will be quickly reduced or eliminated if your spouse is covered by a retirement plan at work
• The deduction for losses on rental properties may be reduced or eliminated