The offer applies to all applications received between now and 27 February that go on for completion, at which point the cashback will be paid.
Mel Buckingham, head of sales at The One account said the firm were keen to help advisers make the most of the opportunities presented to them this year.
"This cashback offer will hopefully provide a kick-start to brokers' current account mortgages sales. The cashback can be left in the client’s current account mortgage reducing the outstanding loan. The One account sales team will be contacting brokers with details of the deal and how they can target their client bank.
“I am pleased to report that since we have introduced the new team, we have seen a significant uplift in submitted applications and I am looking forward to seeing this trend continue as we deliver further developments to the product range.”