Tax Information


Let us help you with your taxes!

Changes Beginning Tax Year 2016

Our Tax Office is happy to help you with your tax questionsCalculate your taxes online and file electronically


Online Tax Tool Button
*Please see note below before clicking

Use our online tax tool to calculate your taxes. Just enter the requested information and the tool will calculate your taxes and fill in a tax form for you. Most full-year residents will then be able to file and pay (if taxes are due) electronically. (Please print a copy for your records.)

If you are not eligible to file electronically, you can print the completed form, sign it and attach the appropriate documentation, and send it in. Please print an extra copy for your records.

Form IR-EZ Instructions   Form IR-EZ Fillable Form

Use our Form IR-EZ to fill in your tax form and file and pay your taxes electronically.  You can also attach your federal form 1040 and W-2.

Who Can Use Form IR-EZ?

The EZ form is for residents who have only very basic W-2 income. It may be used by residents and part-year residents who have up to four W-2s, but only if each W-2 shows local tax withheld for only one city. Please note that this form does not perform any calculations.

*NOTE: Some residents have reported that the PDF generated by the tax tool and Form IR-EZ have not opened correctly in Internet Explorer or Chrome. You may wish to use Firefox to prepare your return or to review the information from Adobe on adjusting your browser settings.

Let Us Complete Your Form

The City of Mason Tax Office staff will be glad to complete your Mason tax return free of charge. Just bring all the necessary W-2's (copies are acceptable), the first page of your Federal Form 1040, and any pertinent federal schedules to the customer service counter.

Location and contact information

(create or use existing account for free secure messages)

Extended Hours

In April, the tax office will hold special hours on scheduled dates:

Saturday, April 8, 2017 8 a.m. - noon
Wednesday, April 12, 2017 8 a.m. - 7 p.m.
Tuesday, April 18, 2017 8 a.m. - 7 p.m.

Regular hours

Make quarterly payments electronically

The online tax tool can also be used to make quarterly tax payments and to see your online payments for the year. Payments made before December 15, 2016, that were not made online are included as well.


Ninety percent of your 2016 taxes are due by December 15, 2016. The deadline for filing 2016 returns is April 18, 2017.

For tax year 2016 quarterly tax payments are due June 15, September 15, and December 15. (The first quarterly payment is made with your previous year's tax return.)

Tax-supported services

Money from Income taxes is used to support many of the services that contribute to the quality of life in Mason. Some of these include:

  • Curbside brush chipping
  • Road construction and maintenance
  • City park land
  • Fall curbside leaf pickup
  • Police protection
  • Snow and ice control
  • City publications
  • Traffic signal maintenance
  • Utility payment office
  • Fish stocking

There are many more benefits to living in the City of Mason than those listed above. Browse through our web site to learn more!

Mason's Tax Ordinance tax years 2015 and prior

Mason's Tax ordinance tax years 2016 and forward

Annual Interest Rate