The new laws, which came into force on April 6 as part of the Work and Families Act, could benefit up to 1.6 million employees who currently provide some kind of unpaid care.
To coincide with the changes, employment relations service Acas has published a new booklet, Flexible working and work life balance.
The booklet can be viewed free at www.acas.org.uk and includes information on the legal changes covered by the Work and Families Act, as well as a step-by-step guide to developing a flexible working policy.
Acas chairman Rita Donaghy said: "Flexible working really can add value to the workplace. Employees who work flexibly often have a greater sense of responsibility, ownership and control of their working life. It makes good business sense."