Business rate concerns for Welsh firms
14 January 2014 Last updated at 14:41 GMT
Some businesses are paying twice as much in rates as they should, according to a Welsh property expert.
Historically business rates were set at about half the cost of a property's rent.
But chartered surveyors Cooke and Arkwright said some companies were now paying an equal amount for both.
Assembly members are to discuss business rates and decide if they should cap increases below the rate of inflation.
BBC Wales economics correspondent Sarah Dickins reports.