The 30% ruling is a tax benefit for certain employees who move to the Netherlands for work. If you qualify, your employer can provide a tax-free allowance for certain additional costs associated with working in the Netherlands away from your country of origin.
The tax-free allowance is processed through your payroll, allowing part of your qualifying remuneration to be paid without wage tax. This can increase your net monthly income.
The 30% ruling does not apply automatically. It must be requested jointly by you and your employer and approved by the Dutch Tax Authorities (Belastingdienst).