Tax Status	12 Months Ended
Dec. 31, 2025
Mayville Engineering Company, Inc. 401(k) Plan
Tax Status
Tax Status	Note 6. Tax Status The Company adopted a prototype volume submitter profit sharing 401(k) Plan with a cash or deferral arrangement which received a letter from the IRS dated June 30, 2020, stating that the Plan and related trust are designed in accordance with applicable sections of the IRC. The Plan has been amended since receiving the opinion letter. The Plan Administrator believes that the Plan is designed, and is currently being operated, in compliance with the applicable requirements of the IRC and, therefore, believe that the Plan is qualified and the related trust is tax-exempt.

The entire disclosure for tax status of employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Includes, but is not limited to, information concerning whether tax ruling or determination letter was obtained and principal assumption on which plan relied in not making provision for federal income tax.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 962
-SubTopic 325
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478873/962-325-55-17

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (g)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478416/962-205-50-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6A-02(c))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477804/962-205-S99-1

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