0000883618 2026-06-16 2026-06-16 0000883618 1 2026-06-16 2026-06-16 0000883618 2 2026-06-16 2026-06-16 0000883618 1 2026-06-16 2026-06-16 0000883618 2 2026-06-16 2026-06-16 iso4217:USD shares pure 0000883618 EX-FILING FEES N-2 424B2 N-2 N-2 Nuveen Select Tax-Free Income Portfolio false Equity Common Shares $0.01 par value per share true 39376966.02 0.0001381 5437.96 Equity Common Shares, $0.01 par value per share true 106083793.09 333-271575 2023-06-22 11690.43 145460759.11 5437.96 0 1761.53 3676.43 true true true Nuveen California Select Tax-Free Income Portfolio N-2 333-271871 2023-05-12 1761.53 Equity Common Shares, $0.01 par value per share 1209600 15984864 false Nuveen California Select Tax-Free Income Portfolio 333-271871 2023-08-01 1761.53 The Registrant is relying upon Rule 457(c) under the Securities Act of 1933 (“Securities Act”) to calculate the registration fee. The maximum aggregate offering price is estimated solely for purposes of determining the registration fee based on the average of the high and low sales prices of the shares of Common Shares, as reported by the New York Stock Exchange on June 10, 2026, in accordance with Rule 457(c) under the Securities Act. The proposed maximum offering price per security will be determined from time to time by the Registrant in connection with the sale by the Registrant of the securities registered under this Registration Statement. The Registrant previously registered 14,000,000 Common Shares in reliance on Rule 457(c) under the Securities Act, with respect to which the Registrant paid filing fees of $22,206.40 in its prior Registration Statement (File No. 333-271575), which was declared effective on June 22, 2023 (the “2023 Registration Statement”). As of the time of this filing, 7,333,826 Common Shares remain unsold from the 2023 Registration Statement. Pursuant to Rule 415(a)(6) under the Securities Act, this Registration Statement carries forward such unsold Common Shares, with respect to which $11,690.43 in filing fees have already been paid. In accordance with the Notes to Instruction 3.C.i. to Form N-2, this statement confirms that the offering of unsold Common Shares previously registered under the 2023 NXC Registration Statement has terminated. N/A false 333-296853 On May 12, 2023, Nuveen California Select Tax-Free Income Portfolio (“NXC”) filed a Registration Statement (File No. 333-271871), which was amended on August 1, 2023 and declared effective by the Securities and Exchange Commission on August 4, 2023, to register 1,300,000 Common Shares (the “2023 NXC Registration Statement”). On January 12, 2026, NXC was reorganized with and into the Registrant (the “Reorganization”). As of the time of this filing, 1,209,600 Common Shares remain unsold from the 2023 NXC Registration Statement. Pursuant to Rule 457(p) under the Securities Act, a filing fee credit of $1,761.53, the amount of the prior filing fee attributable to the unsold Common Shares under the 2023 NXC Registration Statement, remains available to offset future registration fees, which the Registrant, as NXC’s “successor” (as defined in Rule 405 under the Securities Act) by way of the Reorganization, has claimed in connection with this filing. In accordance with the Notes to Instruction 3.C.i. to Form N-2, this statement confirms that the offering of unsold Common Shares previously registered under the 2023 NXC Registration Statement has terminated.