This guide is for existing customers who have already submitted a dyed diesel return and want to amend (change) it. These customers may include:
You can amend (change) a return that was due within the last 3 years. For example, if you were supposed to file a return in 2025, you can amend (change) that return from 2025 to 2027.
To amend (change) a dyed diesel return in License Express, you’ll need the following information from the filing period of that return:
To file your return on time, submit it online or by mail or fax by 5:30 p.m. Pacific Standard Time (PST) on the due date for the current tax return quarter. The table below shows these due dates.
These due dates also apply to amendments (changes) you make to a return you have already filed. For example, if it’s August, you need to amend (change) your return by 5:30 p.m. on October 25 to avoid late fees and penalties.
| Tax return quarter | File by 5:30 p.m. on this due date |
|---|---|
| First quarter: January, February, March | April 25 |
| Second quarter: April, May, June | July 25 |
| Third quarter: July, August, September | October 25 |
| Fourth quarter: October, November, December | January 25 |
If you submit your return after 5:30 p.m., it may not post to your account until the following day.
If one of these dates is a Sunday or holiday, your return will be due on the next business day.
If you owe taxes after filing your dyed diesel return, you can learn how to pay online through this guide, or you may mail a check to:
Department of Licensing
PO Box 9048
Olympia, WA 98507-9048
Like the dyed diesel return, taxes are due by 5:30 p.m. Pacific Standard Time (PST) on the due date for the current tax return quarter. The due dates are also the same as those for your tax returns. For details, see the table with filing quarters and due dates.
If you pay after 5:30 p.m., it may not post to your account until the following day.
There is a penalty fee for late payments. The amount of this fee depends on when you file your return.
The table below shows the late payment fees. For example, if it’s September and you file a return for $100 in taxes on:
| If you don't pay by | You'll owe |
|---|---|
| Due date | 10% penalty |
| First day of the next month | 10% penalty and 1% interest per month |
After you finish filing online, you don’t need to mail your return. In fact, doing so may make it take longer to process your return.
Follow the steps below to amend (change) a dyed diesel return for your government agency or nonprofit organization.
At any time, you may choose the “Save Draft” button to save your progress and continue later:
1. Log onto your License Express account. You may need to complete multi-factor authentication (MFA).
2. On the "Summary” page, find the “Account” heading. Then choose “View Returns.”
3. Under the “Returns” heading, choose “View or Amend Return.”
4. Choose “Amend”:
5. Above “Total Due,” you can see the taxes you owe. Choose the “Next” button.
6. You’ll now see many of the same screens you reviewed when filing your dyed diesel return. You’ll need to go through the following screens, even if you don’t need to make changes to all of them:
If a screen doesn't need updates, choose the “Next” button to continue.
If a screen needs updates, enter the correct information and then choose the “Next” button.
7. Review the information about your return. Then choose the “Submit” button.
8. On the “Confirmation” screen, you'll see a confirmation number. Keep this number for your records. You’ll need it to access this return.
When we finish processing your return, we’ll post the return to your account.
9. You can either choose the “Continue” button to go back to your dashboard or the “Print” button to print your confirmation page.
10. In most cases, License Express will update your return as soon as you finish amending (changing) it.
However, we sometimes need to review and approve amendments (changes). If so, the page for your return will show a banner that says an amendment (change) is pending. 11. If you owe taxes after amending (changing) your return, you can read about how to make a payment.
If we owe you a refund, you’ll be able to choose whether you want to receive it by mail or electronically.
We’ll verify the information you provided. We may contact you with questions at any time while we work to verify your information. Watch your email inbox or your mailbox, depending on the method of communication you chose.
If we need changes, we’ll tell you why. You can try again once you have the correct information or documents.
We may review and correct your return. This includes making changes to the “Total Due” amount. If we make any changes, we'll notify you by phone, email, or mail. You can view changes to your tax return in License Express.
If your return is overdue and you pay before we process the return, check License Express after we process it to make sure your payment went through.