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Part 3 – Residents of a province or territory other than Quebec – CPP contributions on
 
  self-employment and other earnings
 
  Pensionable net self-employment earnings*  
  (amounts from line 122 and lines 135 to 143 of your return)    1
  Employment earnings not shown on a T4 slip on which you elect to pay additional CPP contributions  
  (attach Form CPT20) 373 +  2
  Employment earnings shown on a T4 slip on which you elect to pay additional CPP contributions,  
  line 12 of Form CPT20 (attach Form CPT20) 399 +  3
  Add lines 1, 2, and 3.   =  4
 
  Canada Pension Plan
  Enter the amount from line XX of Part 1. Actual CPP contributions    5
  If the amount at line XX of Part 1 is positive, complete lines 6 and 7.
Otherwise, enter "0" on line 8 and continue on line 9.
  Enter the amount from line 5 above.    6
  Enter the amount from line XX of Part 1.    7
  Line 6 minus line 7 (if negative, enter "0")   =  8
  Line 5 minus line 8 (if negative, enter "0")   =  9
 
  Multiply the amount from line 9 by 20.202.   =  10
 
  Quebec Pension Plan
  Enter the amount from line XX of Part 1. Actual QPP contributions    11
  If the amount at line XX of Part 1 is positive, complete lines 12 and 13.
Otherwise, enter "0" on line 14 and continue on line 15.
  Enter the amount from line 11 above.    12
  Enter the amount from line XX of Part 1.    13
  Line 12 minus line 13 (if negative, enter "0")   =  14
  Line 11 minus line 14 (if negative, enter "0")   =  15
 
  Multiply the amount from line 15 by 18.5185.   =  16
 
  Add line 10 and line 16.   =  17
 
  Enter the amount from line 1 of Part 1. CPP pensionable earnings (maximum $55,900)    18
  Enter the amount from line 14 of Part 1. Basic exemption (maximum $3,500)    19
  Line 18 minus line 19 (maximum $52,400)   =  20
  Enter the amount from line 17 above.    21
  Line 20 minus line 21 (if negative, enter "0")   =  22
 
  Enter the amount from line 4 or line 22, whichever is less.    23
  If the amount at line 5 of Part 1 is less than the amount at line 14 of Part 1, complete lines 24 to 27. Otherwise,
enter "0" on line 28 and continue on line 29.
  Enter the result of line 14 of Part 1 minus line 5 of Part 1.    24
  Enter the amount from line 4 above.    25
  Enter the amount from line 20 above.    26
  Line 25 minus line 26 (if negative enter "0")   =  27
  Line 24 minus line 27 (if negative, enter "0")   =  28
  Earnings subject to contributions: line 23 minus line 28 (if negative, enter "0")   =  29
  Multiply the amount from line 29 by 9.9%.   =  30
  Multiply the amount from line XX of Part 1 (if positive only) by 2.    31
  CPP contributions payable on self-employment and other earnings:  
  Line 30 minus line 31 (if negative, enter "0"). Enter this amount on line 421 of your return. **   =  32
 
  Deduction and tax credit for CPP contributions on self-employment and other earnings:
  Multiply the amount from line 32 by 50%.   =  33
  Enter the amount from line 33 on line 222 of your return and on line 310 of Schedule 1.
 
 
  * Self-employment earnings should be prorated according to the number of months entered in box A in Part 1
(do not prorate the self- employment earnings if the individual died in 2018).
  ** If the result at line 32 is negative, you may have an overpayment. If so, we will calculate it for you.