Until the end of 1997, governmental accounting in Portugal was characterised as essentially cash-based budgetary accounting, using single-entry as the bookkeeping method. The only compulsory accounting system was Budgetary Accounting. As many countries all over the world, nowadays Portugal is implementing a reform of the whole governmental accounting, which has as most important innovations the use of double-entry within a system compulsorily integrating accrual-based Financial and Cost Accounting along with Budgetary Accounting (still essentially cash-based). The main purpose of this paper is to describe and analyse the reform and current situation of governmental accounting in Portugal, especially discussing the accrual basis implementation. In particular, it shows that not only governmental accounting reform in Portugal has been going towards international harmonisation, but also problems that have arisen are common to others faced by several countries. Perspectives of future evolution are also presented.