A most regular type of salary being paid to employees is a monthly salary. Such interval, a month, is most commonly used, however there are countries where it’s expected that the salary for work done is paid each week. I would suggest you consult your local legislation and what’s customary in your country.  

However, the idea behind a monthly salary is more of how it’s measured rather than how often it’s paid. A monthly salary is something that’s a fixed amount within the employment contract and it’s measured for the whole month based on the workload. For an example, if someone is working only part time (say just 75%), they are expected to work for just 75% of the expected work week within each month. To give you a more detailed example, let’s say that the work week is 40 hours long and we have someone working with a 75% workload. This in result means that they should only work for 30 hours each week (40 x 75%) in a month. Depending on the days within a month, their workload is 75% of what’s for someone working full time for the same month.

When calculating their monthly salary it’s important to factor in such details as they could have taken some days off. If someone worked for a full month, they get their fixed amount less any taxes. However, if they were away for some hours or days, their salary is reduced proportionally. For an example, let’s say that the salary is 2,000 and there were 200 working hours within the month. If the employee was away for 1 day, that is let’s presume 10 hours less they worked this much and hence they had 190 actually worked hours. When working for a full month, their hourly wage would be 10, so as a result they now get 1,900 less any taxes (190 x 10).