Prime Minister Anthony Albanese announced a one-off public holiday would be held on Thursday, September 22 to commemorate Queen Elizabeth II.

There are different rules on what can and can't open on the National Day of Mourning in each state.

So will you be able to go shopping and get a coffee in New South Wales, and what is happening to mark the Queen's death?

What's open?

There are no restrictions on trade in NSW with businesses told to treat it the same as other public holidays, such as Labour Day, rather than Christmas and Good Friday when many stores have to close.

Major supermarkets and department stores plan to open as normal.

Museums, galleries and other major attractions in Sydney will also be open.

What about cafes, restaurants and hotels?

Cafes, restaurants and hotels are free to open as normal, however, it is up to individual businesses to decide if it is worth it.

Trade in some areas will be down, such as the CBD, due to fewer workers in the city, while staff costs will be higher.

Some venues may choose to offset this with an additional public holiday surcharge.

It is recommended to check first.

Do penalty rates apply?

Yes, the same penalty rates apply as when working on other public holidays such as Australia Day. In many cases that means more than double the usual rate.

The rules for public holiday penalty rates are set out by the Fair Work Act 2009.

What's closed?

Schools, public libraries and other services such as banks and post offices will be closed.

Most childcare centres are also likely to close.