Honda's Formula One power unit, used by Aston Martin, remains significantly behind rival manufacturers in the 2026 season, prompting additional development funding under FIA rules [1, 2, 3, 4].
The FIA introduced the Additional Development and Upgrade Opportunities (ADUO) system allowing engine manufacturers who are at least 2% behind the best to increase spending on development during the season [1, 2, 3, 4]. Those trailing by more than 10% can receive up to $11 million in extra budget plus a potential $8 million in cost cap relief [1, 2, 3].
Following the Canadian Grand Prix, Honda is expected to be permitted to spend $19 million more on its 2026 engine development, combining the direct budget uplift and cost cap relief [1, 2, 3, 4]. The FIA published details on May 13 outlining how ADUO applies after the first performance review of the season’s opening six races, adjusted due to calendar changes [1, 2, 3, 4].
Mercedes currently leads all four Grands Prix this season and is recognized as having the strongest engine package [1, 2, 3]. Mercedes team principal Toto Wolff expressed concern about potential tactical play but said the system is meant to help lagging manufacturers catch up without disrupting the competitive order. "I would be very surprised... if ADUO decisions... would come up with any interferences into the competitive pecking order as it stands at the moment," Wolff said [1].
Nikolas Tombazis, FIA director of single-seater technical matters, described ADUO as "not a magic bullet" but a cost cap relief mechanism allowing development within the technical regulations. "It simply provides them with leeway to develop their power unit," he said [1].
The 2026 season’s 18 races are split into three assessment periods: races 1-6, 7-12, and 13-18. Performance and development allowances will be reviewed after each block [1, 2, 3]. Honda’s extra spending window will open after the sixth race in Canada, aimed at closing the gap with top engine makers.
