Tax and NINo

What is the difference from a tax point of view between receiving.  A salary based on a pay role or receiving money against invoice.

Reference amount 

How much tax 

Per minth/annum

Are there any levels for different incomes

Start colecting invoices-expenses

Net amount is my actual income

Accountant

Declaration of income once in a year

Have a book! Incomes and expenses

Site riba - 18000/20000 how much are the taxes

Mandy

Trevor

Mpl tutor

Kalo