Michigan Department of Treasury (Rev. 11-20) 
Issued under authority of Public Act 281 of 1967. 

2021 MI-1040ES Additional Instructions and Worksheet 

Nonpayment, Late Payment, or Underpayment of                  Estimated Tax Payments for Farmers, Fishermen 
Estimates                                                     or Seafarers 
                                                              If  at  least  two-thirds  of  your  gross  income  is  from 
If you fail to make required estimated payments, pay 
                                                              farming, fishing or seafaring, you may: 
late or underpay in any quarter, Treasury may charge 
                                                                 • File  your  first  2021  voucher  on  or  before 
penalty  and  interest.   Penalty  is 25 percent  of the 
                                                                 January 18, 2022, and pay the entire amount of the 
tax  due  (minimum  $25)  for  failing  to  file  estimated 
                                                                 estimated tax due, or 
payments  or 10 percent  (minimum  $10) for failing              • File  your  2021  MI-1040  return  on  or  before 
to  pay  enough  with  your estimates  or paying  late.          March 1, 2022, and pay  the  entire  tax  with  the 
Interest is 1 percent above the prime rate in Michigan           return. 
and  is  computed monthly.   The rate  is adjusted  on        If you choose the second option, you do not need to 
July 1 and January 1. For current interest rates, visit       pay estimated tax payments. 
www.michigan.gov/taxes for a copy of                  Revenue 
                                                              Fiscal Year Filers 
Administrative Bulletin 2020-18. 
                                                              Adjust all dates to correspond with your fiscal year. 
Income Changes During the Year 
                                                              The  first  installment  payment  is  due  on  the  15th 
If you receive income unevenly during the year (e.g., 
                                                              day  of  the  fourth  month  after  your  fiscal  year  ends. 
from a seasonal business, capital gain, severance pay 
                                                              (Example:  If  your  year  ends  March  30,  your  first 
or bonus) or if your income changes during the year 
                                                              payment is due July 15.) 
and  you are  already  paying  estimates,  adjust  your 
estimated payment on the next installment.                    Visit Treasury’s Web site at www.michigan.gov/taxes. 
If you are not already  paying estimates,  use the 
following chart to see which period the tax is due. 
If the change occurs:          Pay on or before: 
Jan. 1 through March 31  ......... April 15, 2021 
April 1 through May 31  ........... June 15, 2021 
June 1 through Aug. 31 ........... Sept. 15, 2021 
Sept. 1 through Dec. 31.............         Jan. 18, 2022 
If you do not want to adjust your fourth installment 
voucher,  you  may  file  your  2021  income  tax  return 
before February 1, 2022, instead.  If you choose this 
option,  you  do  not  have  to  file  the  fourth  voucher 
(due January 18, 2022).  If you were not paying 
estimates but a change occurs between September 1 
and December 31 that requires you to file estimates, 
you  may  file  your  2021  MI-1040  return  by 
February 1, 2022, instead of filing an MI-1040ES. 

                                       Worksheet Instructions 
You will need your 2020 Michigan and  federal            personal and dependency exemptions plus any special 
income tax returns for reference (even if you have       exemptions allowed on your Michigan return. Enter  
not completed them yet).                                 the  amount  of your exemption  allowance,  not  the 
Estimate your 2021 income. The Michigan income tax       number of exemptions. 
return begins with federal adjusted gross income (AGI)   If you review the worksheet and still do not know if you 
and allows for additions to and subtractions from AGI.   must file estimates or if you are not sure how much to 
Refer  to Additions  and Subtractions  (Schedule  1)     pay, call 517-636-4486.                             Assistance is available using 
for allowable  additions and subtractions. Enter your    TTY  through the Michigan Relay                     Service by calling          
estimated income subject to tax on line 1.               711. 
To determine your exemption allowance for line 2,        Visit Treasury’s Web site at www.michigan.gov/taxes 
refer  to  your  2020  MI-1040.  You  may  include  all  

                             Estimated Tax Computation Worksheet
                                           Keep for Your Records 

1. Estimated 2021 income subject to tax (see worksheet instructions)  ......................................  1. 
2. Exemption allowance amount (see worksheet instructions)  ..................................................  2. 
3. Balance. Subtract line 2 from line 1.......................................................................................  3. 
4. Estimated tax. Multiply line 3 by 4.25% (0.0425)  .................................................................          4. 
5. All estimated credits  ..............................................................................  5. 
6. Tax you expect to be withheld from your earnings or retirement income   6. 
7. Total deductions. Add lines 5 and 6 .......................................................................................  7. 
8. Estimated tax due. Subtract line 7 from line 4  .......................................................................  8. 
9. Estimated payment due. Divide the amount on line 8 by 4, or by the number of 
   estimated vouchers to be filed (see instructions). Enter here and on each voucher  ...............  9. 

NOTE: Apply your 2020 overpayment to your first quarter. Any unused credit must then be applied to your second 
quarter and following quarters until the entire credit is used.  Do not send an estimate form unless you are sending 
payment with it. 

                                             Payment Record 
                     1st Installment         2nd Installment        3rd Installment                                    4th Installment 

Tax Paid 

Date 

Check Number