Table of Contents

Arrange it right away

Proceed to payment

Why file a digital return?

We need information about your business to determine the level of pollution in the wastewater and the volume of wastewater your business discharges. We use this information to calculate the final assessment for the wastewater treatment fee or pollution fee for your business.

How does it work?

  1. You'll receive an invitation

    You will receive a letter from us inviting you to complete the digital tax return online. The login information is included in the letter. You have one month to complete the return. This period begins on the date shown on the letter.

  2. You fill out the tax return online

    You fill out the form with information such as your address and Chamber of Commerce number, and answer questions about your business. You also provide information about the amount of water used, such as tap water, well water, or rainwater.

  3. We will review your tax return

    We will review the information you have entered and then issue the final tax assessment.

  4. You will receive a final tax assessment

    The final tax assessment shows the amount you owe or are due.

Go to the FAQs

File your digital tax return within 1 month

That means 1 month after the date shown on the letter requesting that you file a digital tax return. 
Can’t do that? Then you can request a 1-month extension. You can do this within the same system where you file your return.

Need help filling out your tax return?

Please contact us for assistance. You can find our contact information here: Contact | GBLT Municipal and Water Board Taxes.

Related pages

Frequently Asked Questions

  • No, the amount may vary

    We estimate the tax amount based on the preliminary assessment. We use the information from your digital tax return and/or the annual statement from the water utility to calculate the final tax assessment. A final tax assessment may therefore be higher or lower than a preliminary assessment.

  • Since the water usage data is available after the end of a tax year, you will receive a preliminary tax assessment at the beginning of the year. The data becomes available after the end of a tax year. That is when we determine and send the final tax assessment.

  • We’ll first send you a reminder

    We understand if you happen to forget to file your tax return once in a while. That’s why we’ll first send you a reminder. If you still don’t file your tax return after that, GBLT will issue a final assessment and you’ll receive a fine of up to €2,460.

View all frequently asked questions