Hacker, Nelson & Co., P.C.

Open by appointment only - please see more information in Hours and Locations.
Additional information about the effects of COVID-19 can be found in our Links page.

Decorah Office Building

News and Tax Deadlines

Federal Tax Due Dates:

Tax Deadlines: Individuals

  • Estimate payment due dates: April 15th, June 15th, September 15th, and January 15th
  • Tax returns due April 15th, (Iowa return due April 30th). If extended by form 4868, tax return due October 15th

Tax Deadlines: Corporations

  • Estimate payment due dates: By the 15th day of the 4th, 6th, 9th, and 12th months of the corporation's tax year.
    • Example: Corp year-end of June 30th would be due by Oct. 15th, Dec. 15th, Mar. 15th, and June 15th
  • Tax returns due March 15th (Calendar year-end)


Federal Tax Due Dates:

Federal Payroll tax deposits are paid through EFTPS (Electronic Federal Tax Payment System) unless paid with the form.

  • Monthly Federal/FICA Depositor
    • Deposit Form 941 taxes on payroll made during a month by the 15th day of the following month
  • Semi-weekly Depositor
    • Taxes for wages paid on Wed, Thurs, or Friday are due by the following Wed. Taxes for wages paid on Sat, Sun, Mon or Tues are due by the following Friday
  • Form 941 Employer's Quarterly Federal Tax Return
    • April 30
    • July 31
    • October 31
    • January 31
  • Federal Unemployment Tax - Due if tax $500 or more
    • April 30
    • July 31
    • October 31
    • January 31
  • Form 940 - Employer's Annual Federal Unemployment Tax Return
    • January 31 of following year
  • Form 943 - Ag Employer's Annual Federal Tax Return
    • January 31 of following year
    • Due monthly if tax liability is over $2,500 for the year

State of Iowa Tax Due Dates:

  • State Withholding - Payable to Treasurer State of Iowa
    • Effective for tax periods beginning on January 1, 2005:
      • Taxpayers must file returns online at https://tax.iowa.gov
      • Paper forms will no longer be provided or available on the website or tax fax
      • Payment will still be accepted by paper check only with payment voucher or by ACH payment through website
  • Iowa State Unemployment - Payable to Iowa Workforce Development
    • April 30
    • July 31
    • October 31
    • January 31
  • Full List of Tax Due Dates:


  • Send W-2's/1099's to recipients by Jan. 31st

Decorah Office

123 West Water Street
P.O. Box 507
Decorah, Iowa 52101
Telephone: (563) 382-3637
Fax: (563) 382-5797

Waukon Office

19 1st Avenue NW
P.O. Box 139
Waukon, Iowa 52172
Telephone: (563) 568-4567
Fax: (563) 568-4569

New Hampton Office

15 East Main Street
P.O. Box 529
New Hampton, Iowa 50659
Telephone: (641) 394-2245
Fax: (641) 394-3138