The tax assessment
Once you have filed your tax return properly (see here for more), the tax authority will issue an assessment of the taxes that you owe based in what you have filed. This is normally on three blue-backed pages (first single-sided and the other double-sided) of A4 size. They also send some explanatory pages.
The first page is the summary of income and the tax calculation. The very bottom of the page is reserved for a payslip with which you can pay the taxes that you owe. Interest for a few weeks is normally built into the calculation; there will be a date by which you must pay before more interest kicks in.
The second and third pages show you a breakdown of the assessed income, tax due and deductions and credits given. You should check that these agree with what you filed, or understand why they are different.