If you lived in the Netherlands the entire concering year and you just had employment income, filing an income tax return is not too hard and often not even required. 

On the website of the Dutch tax authorities, belastingdienst.nl, you can log in with your digid and open their income tax return preparation tool. This tool is usually available as of March 1 of the year following to the concerning tax year. In the tool, you can download information that the Dutch tax authorities have in their records (from employers, financial institutions, local authorities etc.) the so called VIA or "Vooraf ingevulde Informatie". 

Information that the Dutch tax authorities have in their files, will show, usually (not alway) in the right places. In the VIA, not all  information is available, just information from organizations who report to the Dutch tax authorities (employers, financial institutions, local authorities). Information which will not show in the VIA:

- freelance income
- profit on sole proprietorship/entrepreneurship, 
- information with r personal deductions, 
- tax deductible expenses related to the mortgage used for purchase of your principal residence
- foreign income
- non-Dutch savings and investments

- if you have income that is taxed in another country based on a Tax Treaty, double taxation relief is also not automatically filled

Any missing items can be added and if all is reported, you can file your own Dutch income tax return with the Dutch tax authorities electronically. If you have doubts or questions, feel free to contact us.