The Lawn Tennis Association is facing a loss of about £7.5m for 2018, leaving a "financial black hole" for next year, BBC Sport has learned.
It follows a £4.7m loss in 2017, amid falling revenues and participation.
It is understood regional offices may close to reduce costs, but regional operations will continue.
The LTA says it "has a new vision to open tennis up and grow the sport through making it relevant, accessible, welcoming and enjoyable to anyone".
A spokesperson for the national governing body continued: "The LTA is now looking at how best to deliver the new vision and where it can have the greatest impact, to meet the needs of fans, players, coaches and venues to play tennis across Britain.