Magnussen completed a stint at Renault in 2016, before competing with Haas from 2017 until the conclusion of the 2020 season, finishing a career-best ninth in the 2018 World Drivers' Championship.

In 2021, Magnussen moved to the IMSA SportsCar Championship with Cadillac, winning the Detroit Classic; he also contested one round of the IndyCar Series with Arrow McLaren, as well as the 24 Hours of Le Mans with High Class.

Magnussen returned to Haas in 2022 to replace Nikita Mazepin, achieving his maiden pole position at the São Paulo Grand Prix.

He retained his seat in 2023 and 2024, becoming the first driver since former teammate Romain Grosjean in 2012 to receive a race ban after the latter Italian Grand Prix, before departing at the end of the season.

[6] In 2010 Magnussen competed in the German Formula Three Championship with Motopark Academy, winning the opening round of the season at Oschersleben and taking two more race victories.

[25] Magnussen had talks with Honda-powered team Andretti Autosport to compete in the 2015 IndyCar Series, but McLaren blocked the deal.

He was forced to miss qualifying in Canada after again crashing during practice,[39] and started from the pit lane in Azerbaijan when his car was modified under parc fermé conditions.

He suffered a high-speed crash at the Eau Rouge–Raidillon complex whilst running 8th at the Belgian Grand Prix, causing minor injuries and bringing out the red flag.

At the Azerbaijan Grand Prix, Magnussen had run as high as 3rd towards the end of the race in the uncompetitive VF-17, but eventually finished 7th in what would be his best result of the season.

[43] Magnussen ended the season with two 8th-place finishes in Japan and Mexico, but collided with former Formula Renault rival Stoffel Vandoorne in Brazil, causing both cars to retire.

At the Azerbaijan Grand Prix he collided with Pierre Gasly, who criticised Magnussen's defensive driving and branded him "the most dangerous guy" he had ever raced with.

More controversy came at the Japanese Grand Prix, when Sauber driver Charles Leclerc called Magnussen "stupid" over the radio after his attempt to pass the Haas resulted in contact.

He finished the United States Grand Prix in 9th place, but was later disqualified after his car was found to have used more than the legal limit of fuel.

Both were blamed and criticised for the incident, at a race in which Grosjean was testing the old spec of the VF-19 so that the team could understand their recent lack of pace.

After the race, it was determined that Haas had broken rules regarding team radio in telling both drivers to pit at the end of the formation lap, and Magnussen was given a ten-second penalty.

Magnussen and teammate Grosjean departed the team at the end of the 2020 season,[60] to be replaced with Formula 2 champion Mick Schumacher, as well as Nikita Mazepin for the 2021 World Championship.

Magnussen returned to the team as his replacement on a multi-year deal, partnering existing driver Mick Schumacher for the 2022 season.

Magnussen qualified first after George Russell spun at turn 4, bringing out a red flag during which track conditions deteriorated meaning no driver could set a faster time than before the crash.

[68] Magnussen became just the second driver in F1 history to set a pole for a non-Ferrari team using a Ferrari engine, 14 years after Sebastian Vettel did so for Toro Rosso at the 2008 Italian Grand Prix.

He would ultimately finish the sprint race in 8th position, and would retire from the Grand Prix on the opening lap following a collision with Daniel Ricciardo.

Magnussen struggled with qualifying relative to his teammate, although he qualified strongly at the Miami and Singapore Grands Prix (fourth and sixth respectively),[70] and finished in points paying positions three times over the course of the season, achieving tenth place at the Saudi Arabian, Miami and Singapore Grands Prix, for three points to teammate Hülkenberg's 9.

He crashed on the opening lap of the Monaco Grand Prix where he collided with Sergio Pérez; the impact was judged to be a racing incident.

[73] Magnussen finished 9th during the Italian Grand Prix, but was given a 10-second time penalty for causing a collision with Pierre Gasly, dropping him to 10th.

This also meant that with the accumulation of penalty points in his Super License earning him a one-race ban, Magnussen would be forced to miss the Azerbaijan Grand Prix, with his future replacement Oliver Bearman substituting for him.

[75] His race ended at the 2024 Singapore Grand Prix when he hit the wall on lap 50 and suffered a right-rear puncture, retiring from the damage.

Magnussen was originally due to miss only practice and the sprint before taking part in the Grand Prix,[78][79] but would later have to sit out the entire weekend to allow a full recovery.

01 Chip Ganassi Racing DPi car alongside Dutch driver Renger van der Zande.

49 High Class Racing LMP2 car with his father Jan Magnussen and Anders Fjordbach in the 2021 24 Hours of Le Mans.

[87] On 8 February 2021, it was announced that Magnussen would be a part of the driver line-up for Peugeot Sport in the 2022 FIA World Endurance Championship season.

[98] In June 2021, Magnussen was drafted in by Arrow McLaren SP to fill in for the injured Felix Rosenqvist at the Grand Prix of Road America.