Katherine public housing tenants received a letter in the mail this week changing the way they pay rent.
For some, it may have come as a shock with some rents doubling over the next five years.
The NT Government is changing the way it calculates urban public housing rent so that all tenants pay the same rate of rent.
It is the first change in public housing rents since 1999.
The changes will take effect from October 1.
Public housing tenants in Katherine, Darwin, Palmerston, Nhulunbuy, Tennant Creek and Alice Springs have been notified this week.
Existing urban public housing households will pay a rate of 23 per cent of their assessable household income.
Currently, tenants pay varying amounts – between 10 – 23 per cent of their assessable income as rent.