The government will extend a program that encourages property owners to provide affordable housing for renters on low incomes.
Under the pilot scheme, landlords who rent their properties through community housing providers for 25 per cent less than market value don't have to pay land tax.
It was initially set to run for two years but deputy chief minister Yvette Berry has announced it will now run for four years and three months in a bid to attract more landlords.
There are currently two affordable rental schemes being offered by community housing providers.
So far 12 properties are participating since the exemption started eight months ago.
The latest Domain rental report shows Canberra is the most expensive capital city to rent in.
"We believe every Canberran, no matter their circumstances, should have access to safe and affordable housing that suits their needs," Ms Berry said.
"This scheme is just one of the initiatives, in addition to the government's investment in increasing the supply of affordable rental housing and growing the community housing sector in the ACT."
In the June quarter 2019, Canberra's median weekly rent for a three-bedroom house was $520 per week and $470 per week for a two-bedroom unit.
Under the program, the government estimates renters would save at least $130 per week for a three-bedroom house or at least $117 for a two-bedroom unit.
"There has been significant interest in the scheme from landlords and we want property owners to enter the scheme with confidence, knowing it will continue," Ms Berry said.
"The extension we are announcing today is aimed at giving more people making inquiries the confidence they need to enter the program."
The land tax exemption was pushed by the ACT Greens, with a similar motion put forward previously by the Canberra Liberals.
ACT Greens housing spokeswoman, Caroline Le Couteur, had previously called for it to be extended beyond the two-year trial to encourage more landlords to participate.