This paper argues that information provision alone may not be sufficient to provide understanding of the intended mitigation contributions and their expected impact on greenhouse gas (GHG) emissions in the post-2020 period. The parties to the UNFCCC are likely to put forward a diverse range of intended contributions. It also argues that for a particular level of national mitigation ambition, different accounting approaches can result in different headline numbers for emissions reductions. The paper states that it could therefore be difficult for Parties to understand each other’s intended mitigation contributions unless there is also progress on some elements of the post-2020 accounting framework and it accommodates a range of contribution types and varying national capacities to ensure that the contributions can be understood and their implementation tracked.