WASHINGTON — The Internal Revenue Service today announced that interest rates will remain the same for the calendar quarter beginning April 1, 2013. The rates will be:

• three (3) percent for overpayments (two (2) percent in the case of a corporation);
• three (3) percent for underpayments;
• five (5) percent for large corporate underpayments; and
• one-half (0.5) percent for the portion of a corporate overpayment exceeding $10,000.

Under the Internal Revenue Code, the rate of interest is determined on a quarterly basis. For taxpayers other than corporations, the overpayment and underpayment rate is the federal short-term rate plus 3 percentage points.

Generally, in the case of a corporation, the underpayment rate is the federal short-term rate plus 3 percentage points and the overpayment rate is the federal short-term rate plus 2 percentage points. The rate for large corporate underpayments is the federal short-term rate plus 5 percentage points. The rate on the portion of a corporate overpayment of tax exceeding $10,000 for a taxable period is the federal short-term rate plus one-half (0.5) of a percentage point.

The interest rates announced today are computed from the federal short-term rate determined during January 2013 to take effect Feb. 1, 2013, based on daily compounding.

Revenue Ruling 2013-6, announcing the rates of interest, is attached and will appear in Internal Revenue Bulletin 2013-13, dated March 25, 2013.

Some people must pay taxes on their Social Security benefits. If you get Social Security, you should receive a Form SSA-1099, Social Security Benefit Statement, by early February. The form shows the amount of benefits you received in 2012.

Here are five tips from the IRS to help you determine if your benefits are taxable:

1. The amount of your income and your filing status affect whether you must pay taxes on your Social Security.
2. If Social Security was your only income in 2012, your benefits are probably not taxable. You also may not need to file a federal income tax return.
3. If you received income from other sources, then you may have to pay taxes on your benefits.
4. You can follow these two quick steps to see if your benefits are taxable:
   • Add one-half of the Social Security benefits you received to all your other income, including tax-exempt interest. Tax-exempt interest includes interest from state and municipal bonds.
   • Next, compare this total to the ‘base amount’ for your filing status. If the total is more than your base amount, then some of your benefits may be taxable.

     The three 2012 base amounts are:

     $25,000 for single, head of household, qualifying widow or widower with a dependent child or married individuals filing separately who did not live with their spouse at any time during the year;

     $32,000 for married couples filing jointly; and

     $0 for married persons filing separately who lived together at any time during the year.

5. If you use IRS e-file to prepare and file your tax return, the tax software will figure your taxable benefits for you. If you file a paper return, you can use the Interactive Tax Assistant tool on the IRS website to check if your benefits are taxable. The ITA is a resource that can help answer tax law questions. There also is a worksheet in the instructions for Form 1040 or 1040A that you can use to figure your taxable benefits.

For more information on the taxability of Social Security benefits, see IRS Publication 915, Social Security and Equivalent Railroad Retirement Benefits. You can get a copy of this booklet on IRS.gov or by calling 800-TAX-FORM (800-829-3676).

Additional IRS Resources:

• IRS Free File
• E-file Options
• Interactive Tax Assistant tool
• Publication 915, Social Security and Equivalent Railroad Retirement Benefits
• Tax Topic 423 – Social Security and Equivalent Railroad Retirement Benefits