Whatever income voluntarily paid to someone is just.
Individuals should be free to engage in whatever transactions they voluntarily choose to engage in. Forced redistribution from some to others is unjust.
The distribution of income should lead to an efficient allocation of labour.
Wages should reflect relative scarcity, thereby allowing us to allocate resources to where they can be put to their most valuable use.
Those who contribute more deserve more.
People who make a greater contribution should earn a higher income. Pay should reflect contribution, effort, experience and the demands of the job.
Outcomes are fair provided the starting point is.
A just society is characterised by equality of opportunity. No one should be disadvantaged from the start. Market competition is fair as long as everyone's opportunities are truly equal.
A guaranteed minimum standard of living for all.
Everyone should be able to lead a dignified life and be able to meet their basic needs. As long as some people do not have sufficient income to lead a decent life, more income should be redistributed to them. But once everybody has enough, further redistribution need not take place.
Income should be distributed so as to make the worst-off members of a society as well off as possible.
Given human psychology we should accept some level of income inequality in society to harness productive capacity. But a fair society should only tolerate whatever income inequality is necessary to make the worst-off as well-off as they can be.