The North London club have agreed to pay a percentage of his wages in a bargain deal which amounts to around £12million for the season — and they will officially confirm it today.
If the move goes well, it could even be extended for a further year until the end of NEXT SEASON, when his Bernabeu contract is due to expire.
Spurs have worked the numbers to keep within their wage structure and bring back Bale, 31, seven years after selling him to the Spanish giants for a then-world record £86m.
The North Londoners also completed a £25m swoop for Real left-back Sergio Reguilon on a five-year deal.
Spain ace Reguilon, 23, and Bale flew to London yesterday on a private jet chartered by Spurs chairman Daniel Levy.