https://www.silencershop.com/blog/he...ate-compromise
https://www.nationalguntrusts.com/bl...ce=chatgpt.com
(d) EFFECTIVE DATE. The amendments made by this section shall apply to calendar quarters beginning more than 90 days after the date of the enactment of this Act.
That means that 90 days after the end of the current quarter will be January 1, 2026 and the most likely date that this change will go into effect. That also aligns with the Federal Register publishing that takes place quarterly. Once the OBBB is published in the Federal Register (Q3 of 2025), 90 days will need to take place until the tax stamps for suppressors and short-barrel rifles will go to $0, which works out to be January 1, 2026.