Provision of affordable private rental housing can be supported through additional instruments such as supply-side grants, rental guarantees, tax relief to tenants for rental costs and tax relief to landlords for rental income. However, little data are available on the design of these instruments and on the level of public support provided. It will be important for governments to understand how access to good-quality affordable housing can be supported through this sector. Data are not yet robust enough to provide a comprehensive cross-country analysis of the distribution of public spending across various housing policy categories.