Formula One's cost cap has been a defining feature of the sport since 2021, and the latest compliance cycle once again put the spotlight on how the FIA polices team finances. After a nervous Mexico City Grand Prix weekend, the governing body confirmed that nine of the ten F1 teams were compliant with the 2024 financial regulations, with only Aston Martin found to have committed a minor procedural breach.

The FIA acknowledged that Aston Martin's breach "was of a very minor nature, originated by unpredictable circumstances outside the control of the F1 Team." The five power unit manufacturers were also all found to be compliant. The announcement came later than some expected, prompting speculation about a potentially larger breach elsewhere in the paddock.

Explaining the delay, the FIA said reviewing the submissions was "particularly time consuming considering both the complexities of the Financial Regulations and the necessity to assess technical aspects (and related cost treatment) of activities of development undertaken by F1 teams and power unit manufacturers."

What is the cost cap?

The cost cap was introduced in 2021 to limit spending and create a more level playing field, protecting the sport's long-term financial stability. For years, giants such as Ferrari could outspend midfield teams dramatically, creating a performance and infrastructure gap that outfits like Williams are still trying to close.

The push for a cap is not new. Max Mosley, FIA president from 1993 to 2009, lobbied for budget controls for years, but teams only came around at the end of the 2010s when some of the biggest crews were spending upwards of $300 million.

The initial budget cap was set at $145 million per team for 2021. The baseline has since been $135 million since 2023, though accounting for inflation this figure sits closer to $165 million for the 2024 season. With major regulatory changes arriving next season, the 2026 financial regulations require the cap to be set at $215 million to account for research and development costs tied to the new power unit and chassis rules.

Certain areas fall outside the cap, such as marketing and hospitality costs and the salaries of a team's top three executives. But what is included is wide-ranging and heavily focused on car performance (though not the engine), including design and development, manufacturing, wind tunnel work, race operations, the majority of personnel salaries (driver salaries are exempt) and transport costs.

Because car development is covered, crashes can become a business talking point as a season wears on — spares must be produced, diverting funds from other areas and potentially compromising future development.

How are teams audited?

Compliance is overseen by Federico Lodi, the FIA's financial regulations director, and his team. Submissions can run from 150 to 200 pages of documents. After initial assessments, on-site visits take place before compliance certificates are issued — or teams found in breach face further steps such as an Accepted Breach Agreement (ABA) or referral to the cost cap adjudication panel.

Compliant teams can also report rivals they suspect of breaching the rules, with the cost cap administration deciding whether to investigate.

What are the penalties?

There are three types of breach — procedural, minor overspend and material overspend — with severity dictating the penalty. A procedural breach concerns documentation and reporting compliance, such as filing late. A minor overspend of less than five percent of the cap can lead to minor sporting or financial penalties. A material overspend above five percent carries broader implications.

If a team is found to have significantly overspent, constructors' championship points are deducted, and they may also face financial or sporting penalties. Mitigating and aggravating factors are taken into account.

Under the 2025 financial regulations, the Cost Cap Administration may refer a case to the adjudication panel in four scenarios: an ABA not being entered into for a procedural or minor overspend breach; a non-submission or material overspend breach; failure to comply with the terms of an ABA; or following an investigation of a complaint from a complainant team.

For an ABA to occur, the team must accept both the violation and the proposed sanctions, which can include enhanced monitoring procedures and ongoing conditions or obligations.

A history of past infringements

There is precedent for breaches. In June 2022, Williams was fined $25,000 for a procedural breach after failing to file on time for the second deadline, though it voluntarily disclosed the issue and accepted an ABA.

In October 2022, news broke that Red Bull had committed a minor overspend breach for the previous year, exceeding the cap by 1.6 percent. The team was fined $7 million and faced a reduction in wind tunnel testing time the following season.

Also in October 2022, Aston Martin was fined $450,000 for a procedural breach after it "incorrectly excluded and/or adjusted" several costs in its 2021 submission — the first year of the regulations — and entered an ABA.

In September 2024, the FIA announced that two power unit manufacturers, Honda Racing Corporation and Alpine Racing SAS, had committed procedural breaches in the first year of the PU financial regulations, with ABAs reached with both.

Teams up and down the paddock insist nobody deliberately breaks the cap. "I can speak from experience, it's a very, very difficult thing to balance. You want to be competitive. You can imagine — you want to spend every last dollar up against your cost cap limit," said Sauber team boss Jonathan Wheatley in Mexico City. "We're in a competitive sport. I think the first thing I would say is that nobody's doing it intentionally. You know, these things happen sometimes. Things can just get out of control a little bit — like a car crash, something like that — and unexpected costs late on."