
Forecast your settlement after the year now, while you can still fix it: income tax due against the wage tax and provisional assessment paid, and allowances against the advances you get.
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The tax settlement comes with your final assessment after you file (from 1 March); allowances are settled when Dienst Toeslagen makes the final calculation, usually in the second half of the year after.
What the final assessment will come to: Box 1 and Box 3 together, with the tax credits taken off the total.
Each employer withholds wage tax on its own wage, and takes off the tax credits only if you asked it to (loonheffingskorting).
Estimate for employees below state pension age. Wage tax is approximated per employer over the year (bonuses and holiday pay at the special rate even out over the year). Childcare allowance and the working-parent credit are not included. The Belastingdienst and Dienst Toeslagen decide the final amounts.