But on top of resetting Putin's term limits, the reforms would consolidate presidential powers by allowing him to nominate top judges and prosecutors, for approval by the upper house of parliament.
Yet it comes as Putin is suffering historically low approval ratings over his handling of the coronavirus pandemic and the economy, including hugely unpopular changes to the pension system.
Among other changes, the reforms would reset Putin's presidential term-limit clock to zero, allowing him to run two more times and potentially stay in the Kremlin until 2036.
Putin introduced the reforms to the 1993 constitution in January this year, and they were hastily adopted by both houses of parliament and regional lawmakers.
MOSCOW: Russians go to the polls Thursday to cast early votes in a nationwide ballot on constitutional reforms that could see President Vladimir Putin remain in power until 2036.