Minimum wage for different types of work
4. Paid per task or piece of work done
Workers paid per task they perform or piece of work they do (known as piece work) are classed as doing ‘output work’. They must be paid either at least the minimum wage for every hour worked or on the basis of a ‘fair rate’ for each task or piece of work they do.
Output work can usually only be used in limited situations when the employer doesn’t know which hours the worker does (eg as with some home workers). If an employer sets the working hours and the workers have to clock in and out, this counts as time work, not as output work.
Fair rate
The fair rate is the amount that allows an average worker to be paid the minimum wage per hour if they work at an average rate.
There is a way to work out the fair rate per piece of work done which employers must follow.
Work out the fair rate

Find out the average rate of work per hour (tasks or pieces completed).

Divide it by 1.2 (this means new workers won’t be disadvantaged if they’re not as fast as the others yet).

Divide the hourly minimum wage rate by that number to work out the fair rate for each piece of work completed.
Work out the average rate of work per hour
To work out the rate to pay workers, employers must carry out a fair test to see what the average rate of work is.

Test some or all of the workers. The group you test must be typical of the whole workforce  not just the most efficient or fastest ones.

Work out how many pieces of work have been completed in a normal, average working hour.

Divide this by the number of workers to work out the average rate.

If the work changes significantly, do another test to work out the new average rate. It’s not necessary to do another test if the same work is being done in a different environment, eg work previously done in a factory being done at home.
Example
Workers are paid for each shirt they make. They can produce on average 12 shirts per hour. This number is divided by 1.2 to make 10.
Andy is 21 and is eligible for the minimum wage rate of £6.70.
This means he must be paid at least 67p per shirt he makes (£6.70 divided by 10).