21st Century Accounting Payroll Tax Updates Download

Payroll Tax Update January 31, 2020

This Tax Update does not include FIT changes for 2020 W-4s. Do not install this Tax Update if you have installed the January 16, 2020 Payroll Tax Update and started payroll for 2020.

Please provide your name, email address, and 21st Century Accounting or Payroll for Adagio Product Serial Number to download the latest Payroll Tax Update. You can find your Product Serial number on your C21 main menu under Help/About. This update is available only for registered users of C21 who have a current subscription for Payroll Tax Updates.

Please do the following before installing this update:

  1. Check your current Tax Update in the Help/About window of your C21 installation.
  2. Make a backup of all of your companies.

Fill out the form and click send to proceed to the download page. All fields are required.



Serial Number

Where to find your Serial Number

If you are unable to download the Payroll Tax Update, you may need to renew your subscription. Please contact us to renew.

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To see a list of past Payroll Tax Update Changes, click here.

January 31, 2020 Payroll Tax Update

This Tax Update does NOT include FIT changes for 2020 W-4s. If you previously installed the January 16, 2020 Payroll Tax Update, do not install this Tax Update.

FIT changes for 2019 or previous W-4s only

State Forms
Oklahoma Electronic Filing W-2s adjustment

State and Local Income Tax
California SDI
Illinois (IL SIT)
Oregon (OR SIT)
Maryland (MD CIT)
The following Maryland counties have new rates:

  • Anne Arundel County
  • Baltimore County
  • Dorchester County
  • Kent County
  • Nonresident
  • Washington County
  • Worcester County

New Mexico (NM SIT) - New Mexico has added an additional filing status for Head of Household. You may need to reconfigure employees that have selected this filing status on their W-4.

In addition to this change, New Mexico withholding will no longer be reduced by the number of allowances claimed. No action is required for this change as the new calculation will exclude whatever number is currently entered in the 'Allowances claimed' box. If you would like more information about this, please visit the New Mexico Taxation and Revenue Department website.

January 10, 2020 Payroll Tax Update


State Forms
Oklahoma W-2 Electronic Filing Adjustment

State and Local Income Tax

SUTA Wage Base (Maximum taxable earnings)
State                2020            2019

January 1, 2020 Payroll Tax Update - Cumulative Tax Changes from 12/1/2019 - 1/1/2020

Support for 2019 Federal Form 940
Support for 2019 Federal Form 940 Schedule A
Federal Wage Base increases to $137,700 for 2020

State Forms

State and Local Income Tax
California (CA SIT)
Iowa (IA SIT)
Kentucky (KY SIT)
Maine (ME SIT)
Michigan (MI SIT)
Missouri (MO SIT)
North Carolina (NC SIT)
New York State (NY SIT)
New York Yonkers (Yonkers IT)
Ohio (OH SIT)
South Carolina (SC SIT)

SUTA Wage Base (Maximum taxable earnings)
State                2020            2019
AR SUTA             7,000           10,000
IA SUTA            31,600           30,600
KY SUTA            10,800           10,500
LA SUTA             7,700            7,700
MN SUTA            35,000           34,000
MO SUTA            11,500           12,000
MT SUTA            34,100           33,000
NJ SUTA            35,300           34,400
NM SUTA            25,800           24,800
NV SUTA            32,500           31,200
NY SUTA            11,600           11,400
OH SUTA             9,000            9,500
OK SUTA            18,700           18,100
OR SUTA            42,100           40,600
UT SUTA            36,600           35,300
VT SUTA            16,100           15,600
WA SUTA            52,700           49,800
WY SUTA            26,400           25,400