SECTION 2. BACKGROUND
Internal Revenue Bulletin 2013-31 · 2026-10-03 edition · updated 2026-10-04 · United States
.01 Money Market Funds
(1) An MMF is a type of investment company registered under the Investment Company Act of 1940 (1940 Act) and regulated as a money market fund under Rule 2a–7 under the 1940 Act (17 C.F.R. § 270.2a–7). Unlike other types of mutual funds, MMFs have historically sought to keep stable (typically at $1.00) the prices at which their shares are issued and redeemed. The types of securities that MMFs are permitted to hold and the share-pricing and valuation methods specific to MMFs have made stable prices possible.
(2) To be treated as an MMF, an investment company must meet the requirements specified in Rule 2a–7, which, among other things, establishes limitations as to the maturity, quality, diversification, and liquidity of an MMF’s investments. Generally, an MMF must hold a diversified portfolio of short-term, low-risk securities. The securities that an MMF holds generally result in no more than minimal fluctuations in the MMF’s net asset value.
(3) Previously, an MMF meeting the requirements of Rule 2a–7(c) was permitted by that provision to compute its price per share for purposes of issuance and redemption by using either or both of (a) the amortized cost method of valuation and (b) the penny-rounding method of pricing. Under the amortized cost method, an MMF’s net asset value is determined by treating the fund’s portfolio securities as having a value equal not to their then-current fair market value but rather to their acquisition cost, adjusted for amortization of premium or accretion of discount. Under the penny-rounding method, an MMF’s net asset value per share is rounded to the nearest one percent. These methods generally enabled MMFs to maintain constant share prices except in situations in which the amortized cost method or penny-rounding method resulted in a variation in share price that exceeded one-half of one percent (commonly called “breaking the buck”).
(4) The perceived safety and simplicity of MMFs have led to their widespread use as cash management vehicles. It is therefore common for investors to purchase and redeem MMF shares frequently. An MMF is often used as a sweep account into which cash is automatically deposited on a daily basis. MMFs generally declare dividends daily and distribute them monthly. MMF shareholders typically reinvest these distributions automatically in the MMF.
(5) The Securities and Exchange Commission (SEC) has limited the situations in which an MMF is permitted to use the amortized cost method to those in which other mutual funds are permitted to use this method. [Cite final SEC rules.] In addition, the SEC has restricted the use of the penny-rounding method to government MMFs and retail MMFs. 1 In the case
of an MMF that is neither a government MMF nor a retail MMF, Rule 2a–7 now requires the MMF to value its portfolio securities using market-based factors and to issue and redeem shares at a price that is rounded to the nearest basis point, or one one-hundredth of one percent (basis point rounding). 2
(6) An MMF that uses market factors to value its securities and uses basis point rounding to price its shares for issuance and redemption will have a share price that changes frequently, or “floats” (a floatingNAV MMF). A floating-NAV MMF will therefore resemble other mutual funds that are not MMFs, except for the restrictions on the assets that an MMF is permitted to hold and the unique role that MMFs have historically occupied.
(7) Constant share prices have simplified the taxation of MMF share transactions because a shareholder does not realize gain or loss when a share is redeemed for an amount equal to its basis. Shareholders will typically realize gain or loss, however, on redemptions of floating-NAV MMF shares. In certain circumstances, a loss realized on the redemption of an MMF share may implicate the wash sale rules of § 1091, as discussed in section 2.02 of this revenue procedure.
(8) Sections 6045, 6045A, and 6045B establish certain reporting requirements relating to securities. Each of those sections has an exception for an MMF that stabilizes its share price at a constant amount that approximates its issue price or the price at which it was originally sold to the public. See §§ 1.6045–1(c)(3)(vi), 1.6045A–1(a)(1)(v), and 1.6045B–1(a)(5) of the Income Tax Regulations. A floating-NAV MMF that does not stabilize its share price at a constant amount is not eligible for those exceptions. Sections 6045, 6045A, and 6045B, however, also contain exceptions for certain transactions involving exempt recipients, which include subchapter C corporations and certain other entities. See §§ 1.6045–1(c)(3)(i), 1.6045A–1(a)(1)(iii), and 1.6045B– 1(a)(4). Most shareholders of floating-NAV MMFs are expected to be exempt recipients, which will reduce
1 A government MMF is an MMF that maintains at least 80 percent of its assets in cash and certain government securities and repurchase agreements. A retail MMF is an MMF that limits each shareholder’s redemptions to $1 million per business day.
2 The SEC has also amended Rule 2a–7 to require every MMF to disclose daily the fund’s current net asset value (NAV) per share rounded to the nearest basis point, but government and retail MMFs are not required to use basis point rounding to issue and redeem shares.
July 29, 2013 121 2013–31 I.R.B.
account. On October 15 of year 1, Taxpayer redeems $200,000.00 of Fund shares from the same account when Fund’s price per share is $0.9980. Taxpayer engages in no other transactions in Fund shares or any substantially identical shares or securities during year 1. Fund is a regulated investment company within the meaning of § 1.1012–1(e)(5) and Taxpayer uses the average basis method to determine the basis of its shares.
(2) Taxpayer’s average basis in each Fund share increased to $1.0001 when Taxpayer purchased 249,875.06 shares on October 1 ($1,250,000.00 total purchase price divided by 1,249,875.06 shares). Based on Fund’s market NAV on October 15, Taxpayer redeemed 200,400.80 shares to receive $200,000.00 in proceeds. Taxpayer therefore realizes a loss of $420.83 on the October 15 redemption (proceeds of $200,000.00 minus basis of $200,420.83 in redeemed shares), or a loss of $.0021 per share (proceeds of $.9980 per share minus basis of $1.0001 per share). This loss is a de minimis loss under section 4.02 of this revenue procedure because the loss of $.0021 per share is less than $.0050 per share (.5% of $1.0001). Therefore, under section 4.01 of this revenue procedure, the IRS will not treat the loss on each Fund share as subject to current disallowance under § 1091.
.02 Example 2 . (1) The facts are the same as in Example 1, except that Fund’s price per share at the time of the October 15 redemption is $0.9940.
(2) As in Example 1, Taxpayer’s average basis in each Fund share is $1.0001 after the second purchase. Based on Fund’s market NAV on October 15, Taxpayer redeemed 201,207.24 shares to receive $200,000.00 in proceeds. Taxpayer therefore realizes a loss of $1,227.36 on the October 15 redemption (proceeds of $200,000 minus basis of $201,227.36 in redeemed shares), or a loss of $.0061 per share (proceeds of $.9940 per share minus basis of $1.0001 per share). Because the loss of $.0061 per share is more than $.0050 per share (.5% of $1.0001), Taxpayer’s loss is not a de minimis loss under section 4.02 of this revenue procedure and is subject to current disallowance under § 1091. The entire loss is disallowed under § 1091(a) because Taxpayer purchased more than 201,207.24 shares on October 1.
(3) Taxpayer’s basis in its Fund shares after the application of § 1091(a) is determined as follows. First, Taxpayer’s basis in 201,207.24 of the 249,875.06 shares it purchased on October 1 is increased to $202,454.71 (Taxpayer’s $201,227.36 basis in the sold shares, increased by $1,227.36, which is the difference between the $201,227.36 basis in the replacement shares and the $200,000.00 received for the sold shares). Second, the average basis of all Fund shares held by Taxpayer is determined by dividing Taxpayer’s total basis in its Fund shares of $1,050,000.00 (the sum of the $202,454.71 basis in the replacement shares computed above and the $847,545.29 basis in the remaining 847,460.58 shares) by Taxpayer’s total remaining Fund shares of 1,048,667.82. Accordingly, Taxpayer’s average basis in each Fund share on October 15, year 1 is $1.0013.
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