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<!-- #BeginEditable name="pagetitle" --><h2 class="center">Interest Rates</h2><!-- #EndEditable -->
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<p><a href="../index.html">Office of the Chief Actuary </a> </p>
<p><a href="newIssueRates.html">Interest rates</a>, 2000 & later</p>
<p><a href="interestrates1937-99.html">Interest rates</a>, 1937-99</p>
<p><a href="investheld.html">Investments held</a> by trust funds</p>
<p><a href="transactions.html">Investments transactions</a></p>
<p><a href="assets.html">Trust fund asset growth</a></p>
<p><a href="funds.html">Trust fund data</a></p>
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<p>
<b>Investments</b><br />
All securities held by the
<a href="describeoasi.html">Old-Age and Survivors Insurance</a> (OASI) and
<a href="describedi.html">Disability Insurance</a> (DI) Trust Funds are
issued by the Federal government. All of these securities are
<a href="specialissues.html">special issues</a>&#8212;securities
issued only to the trust funds. In the past, the trust funds also held
marketable securities, which are available to the public.</p>
<p>
<a name="formula"><b>Interest rates</b></a><br />
Special-issue investments bear interest rates determined monthly by
<a href="intrateformula.html">a formula</a> specified by law.
An interest rate is determined on the last business day of a month
and applies to securities issued in the following month. Tables of such
<a href="newIssueRates.html">monthly interest rates</a> provide
rates back to 1937&#8212;the beginning of the Social Security program.</p>
<p>
<b>Frequency of interest payments</b><br />
Interest on special-issue investments is paid semi-annually,
at the end of June and the end of December.
Because the trust funds hold no cash, investments are redeemed each month to
pay for benefits and administrative expenses. When investments are redeemed,
interest is paid. The amount of interest paid is used to offset the amount
of investment redemptions.</p>
<p>
<a name="effectiverates"><b>Effective interest rates</b></a><br />
Although new investments for each trust fund carry the
same interest rate, amounts of income and outgo differ between funds,
resulting in a different investment portfolio for each trust fund. An
<i>effective interest rate</i> provides a measure of the rate of return
on an investment portfolio. We calculate an effective
interest rate by dividing interest earned on investments
during a calendar year by the average level of investments during the year.
A table of such <a href="./effectiveRates.html">effective
rates</a> provides rates back to 1940 by trust fund.</p>
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<p>The effective rates in the graph are for the combined OASI and DI
Trust Funds. For comparison, the annual average of
the monthly special-issue rates are also shown. The rates shown are for
1968 and later. Clicking on the graph will reveal the same type of data
going back to 1940.</p>
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alt="link to data on annual average monthly interest rates and annual effective interest rates"
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