TAX PERCENTAGE

Difficult to understand "a person received 4696,93 TAX"
Is this a refund?
These might help: http://europa.eu/youreurope/citizens/work/taxes/income-taxes-abroad/belg...

http://ccff02.minfin.fgov.be/taxcalc/app/anonymous/public/common/chooseL...

There's no way anyone can answer your question without more information. Personal income tax rates (to the federal government) vary from 25% to 50% depending on how much you earn, and there are tax free allowances and deductions that you can make depending on such things as the number of children you haven if you have a mortgage etc. There are also communal taxes to pay depending on where you live.
And, you also have to pay social security contributions.

To the best of my knowledge and in brief and general, tax is imposed on net income (excluding any tva invoiced to clients if that applies) and after deducting expenses, where the percentages deduction depends on the type of expense. After deductions, the first +/- 6000 are not taxed, as well as an equal amount if you are filing a joint declaration and your partner is not employed. Thereafter, start at 25% and increase stepwise to a maximum of 50%. This is in general terms, but as the other respondents wrote, it is not possible to say without complete information.

Oh dear - you don't even understand enough about this to ask some basic questions...

If you work for yourself, ask your accountant.
If you work for someone else, ask the payroll person.