Guernsey States are being asked to approve the necessary legislation so the property tax can be changed in Alderney.
In July 2018, Alderney States proposed a single property tax, to "bring benefits of simplicity, transparency and more efficient administration".
It will allow Alderney to adjust the rates on businesses and domestic properties themselves.
Currently the island taxes property using Guernsey's system of TRP - tax on real property - which uses a building's size to determine tax rate.
Alderney States are now calling on Guernsey States' Policy & Resources Committee to approve the necessary legislation so the new single property tax can be implemented by 1st January 2020.
In 2016, the financial relationship between Guernsey and Alderney was reviewed.
Alderney now sets their own levels of property tax, import duties and occupier's rates.
This move from the Guernsey property taxation system to their own property taxation system will mark the next step in the Financial Relationship agreement.