The Royal Commission into Long Term Care has significantly underestimated the cost of providing care according to Scottish Widows.
The life office says the commission has misjudged the cost of providing personal care free at the time of need when it made its projections.
As a result Widows is writing to the Government ministers to voice its concerns.
Widows healthcare products manager George Andrew says: "The cost of the Commission's proposals is put at £1.1bn in the first year.
"However, this is based on many assumptions one of which is that there will be little change in the way care is provided by friends and relatives. The value put on this care is massive so even a small change in it would have a large effect on their projections of cost."