Rent regulations must—
define what is meant by "high income" for the purposes of this Chapter, and
make provision about how a person's income is to be calculated.
The regulations may, in particular—
define "high income" in different ways for different areas;
specify things that are, or are not, to be treated as income;
make provision about the period by reference to which a person's income is to be calculated (which may be a period in the past);
make provision about how a person's income is to be verified;
require a person's household income (as defined by the regulations) to be taken into account;
require a local housing authority to have regard to guidance given by the Secretary of State when calculating or verifying a person's income.