| Calendar |
| Calendar changes | Calendar is expanded to fifteen events (up from fourteen) with new events in Scotland and United States and Italian round moving from gravel of Sardinia to asphalt of Rome. To make room, Portugal is dropped. |
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| Sporting |
| Manufacturer's Championship change | Manufacturer's Championship is renamed to Constructor's Championship, opening it to independent tuners in addition to automotive manufacturers. Otherwise it retains it's basic elements, mainly the scoring scheme and requirement to participate in every round.
Team's Championship retains requirement to contest seven nominated events, one of which must overseas event and requirement to participate in season's final event. |
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| Technical |
| New Rally2 based Rally1 cars | For 2027 season, new and much cheaper top tier cars will be used. Still called Rally1, these cars are based existing Rally2 rules with certain modifications. Team can make such car either directly (known as WRC27 car) or by adding a kit to existing Rally2 car. Kit can include homologated aerodynamic aids to front and back as well as larger restrictor.
Such cars can now be created by constructors as well as manufacturers, opening the way for more teams as a constructor can be independent tuner having no official ties with automotive brand. |
| Turbo restrictor | Diameter of turbo restrictor for Rally1 cars is set to 33 mm (Rally2 cars still have 32mm). |
