Payroll Deductions Formulas - 108th Edition Effective July 1, 2018

T4127(E) Rev. 18

La version française de cette publication est intitulée Formules pour le calcul des retenues sur la paie – 108e édition.

Table of contents

Is this guide for you?

Use this guide if you are a payroll software provider or a company which develops its own in-house payroll solution.

This guide has the formulas you need to determine federal, provincial (except Quebec), and territorial income taxes, Canada Pension Plan (CPP) contributions, and employment insurance (EI) premium deductions. The formulas also let you calculate payroll deductions for special cases such as commission, pension income, bonuses, and retroactive pay increases.

The formulas used in this guide to calculate statutory deductions have been approved for purposes of the Income Tax Act, the Canada Pension Plan, and the Employment Insurance Act, as well as their related regulations and any amendments proposed to these acts.

For more information on income amounts that are subject to payroll deductions, see Publication T4001, Employers’ Guide – Payroll Deductions and Remittances.

If you have questions about the formulas in this guide, contact your tax services office or tax centre. For the address and telephone numbers of your tax services office or tax centre, visit our webpage at canada.ca/taxes.

Distribution of this guide

This guide is available in electronic format only.

Electronic mailing lists – more ways to serve you!

We provide an electronic service that can notify you immediately, free of charge, of any changes for payroll deductions.

To subscribe, go to canada.ca/cra-email-lists and enter your business’s email address for each mailing list that you want to join.

Payroll Deductions Online Calculator

For your payroll deductions, you can use our Payroll Deductions Online Calculator (PDOC). The calculator includes an option to help you make sure that enough Canada Pension Plan contributions and employment insurance premiums have been withheld for employees. It calculates payroll deductions for the most common pay periods, as well as the applicable province (except Quebec) or territory. The calculation is based on exact salary figures.

PDOC is available at canada.ca/pdoc.

Payroll Deductions Tables

You can download Publication T4032, Payroll Deductions Tables and Publication T4008, Payroll Deductions Supplementary Tables, from our webpage at canada.ca/payroll. You can also choose to print only the pages or information that you need.

What’s new for July 1, 2018?

This guide reflects some income tax changes recently announced which, if enacted as proposed, would be effective July 1, 2018. At the time of publishing, these proposed changes were not law. We recommend that you use the Payroll Deductions Online Calculator (PDOC), Publication T4032, Payroll Deductions Tables, or Publication T4008, Payroll Deductions Supplementary Tables, and the formulas in this guide for withholding, starting with your first payroll in July 2018.

Changes included in this edition

Provincial tax changes

Some provincial changes have been announced for July 1, 2018. As a result, we have not revised the entire guide, but we have provided this updated edition, which contains the provincial changes for Prince Edward Island.

For formulas and factors not included in this edition, see Guide T4127, Payroll Deductions Formulas – 107th Edition, effective January 1, 2018.

You will find below the provincial tax changes effective July 1, 2018.

Prince Edward Island

The Prince Edward Island budget, tabled on April 6, 2018, announced that effective January 1, 2018, the province will increase the basic personal amount to $8,660 from $8,160.

Since $8,160 has been used for employees for the first six months of this year, a basic personal amount of $9,160 will be applied for the remaining six months commencing with the first payroll in July. The Option 2 personal amounts will not be prorated. Effective July 1, 2018, the prorated amount for Option 1 is as follows:

  • The basic personal amount is revised to $9,160.

Refer to the revised Form TD1PE for complete information on personal amounts effective July 1, 2018.

For the provincial tax rates to apply for Option 2, starting July 1, 2018, see the Option 2 formulas.

Chapter 1 – Claim codes

As Prince Edward Island is the only province to have a provincial change, we are only reproducing their calculations.

July 2018 Prince Edward Island claim codes
Claim code Total claim amount ($) Option 1, TCP = ($) Option 1, K1P = ($)
0 No claim amount 0.00 0.00
1 9,160.00 9,160.00 897.68
2 9,160.01 – 10,760.00 9,960.00 976.08
3 10,760.01 – 12,360.00 11,560.00 1,132.88
4 12,360.01 – 13,960.00 13,160.00 1,289.68
5 13,960.01 – 15,560.00 14,760.00 1,446.48
6 15,560.01 – 17,160.00 16,360.00 1,603.28
7 17,160.01 – 18,760.00 17,960.00 1,760.08
8 18,760.01 – 20,360.00 19,560.00 1,916.88
9 20,360.01 – 21,960.00 21,160.00 2,073.68
10 21,960.01 – 23,560.00 22,760.00 2,230.48

Chapter 2 – Glossary

All factor definitions appear only in the Glossary unless further details are required in specific situations.

Glossary
Factor Meaning (for complete details, see the formulas)
A Annual taxable income
B Gross bonus, retroactive pay increase, vacation pay when vacation is not taken, accumulated overtime payment or other non-periodic payment
B1 Gross bonuses, retroactive pay increases, vacation pay when vacation is not taken, accumulated overtime payments or other non-periodic payments year-to-date (before the pay period)
BPA Basic personal amount (only applies to Nova Scotia)
C Canada (or Quebec) Pension Plan contributions for the pay period
D Employee’s year-to-date Canada Pension Plan contribution with the employer (cannot be more than the annual maximum)
D1 Employee’s year-to-date employment insurance premium with the employer
E Total commission expenses deductions reported on Form TD1X
EI Employment insurance premiums for the pay period
F Payroll deductions for the pay period for employee contributions to a registered pension plan (RPP) for current and past services, a registered retirement savings plan (RRSP), to a pooled registered pension plan (PRPP), or a retirement compensation arrangement (RCA). For tax deduction purposes, employers can deduct amounts contributed to an RPP, RRSP, PRPP, or RCA by or on behalf of an employee to determine the employee’s taxable
F1 Annual deductions such as child care expenses and support payments, requested by an employee or pensioner and authorized by a tax services office or tax centre
F2 Alimony or maintenance payments required by a legal document dated before May 1, 1997, to be payroll-deducted authorized by a tax services office or tax centre
F3 Employee registered pension plan or registered retirement savings plan contributions deducted from the current non-periodic payment. You can also use this field or design another to apply other tax-deductible amounts to the non-periodic payment, such as union dues
F4 Employee registered pension plan or registered retirement savings plan contributions deducted from the year-to-date non-periodic payments. You can also use this field or design another to apply other tax-deductible amounts to the non-periodic payment, such as union dues
G Gross commission amount including gross salary at the time of payment, plus any taxable benefits for commission-remunerated employees who have filled out Form TD1X. When an employee has not filed Form TD1X, tax is calculated the regular way
HD Annual deduction for living in a prescribed zone, as shown on Form TD1
I Gross remuneration for the pay period. This includes overtime earned and paid in the same pay period, pension income, qualified pension income, and taxable benefits, but does not include bonuses, retroactive pay increases, or other non-periodic payments
I1 Total remuneration for the year reported on Form TD1X. This includes commission payments, salary (where applicable), non-periodic payments, and taxable benefits.
IE Insurable earnings for the pay period including insurable taxable benefits, bonuses, and retroactive pay increases
K Federal constant. The constant is the tax overcharged when applying the 20.5%, 26%, 29%, and 33% rates to the annual taxable income A
KP Provincial or territorial constant
K1 Federal non-refundable personal tax credit (the lowest federal tax rate is used to calculate this credit)
K1P Provincial or territorial non-refundable personal tax credit (the lowest tax rate is used to calculate this credit)
K2 Federal Canada (or Quebec) Pension Plan contributions and employment insurance premiums tax credits for the year (the lowest federal tax rate is used to calculate this credit). Note: If an employee has already contributed the maximum CPP, EI, or QPIP for the year with the employer, use the maximum CPP, EI, or QPIP deduction to determine the credit for the rest of the year. If, during the pay period in which the employee reaches the maximum, the CPP, EI, or QPIP, when annualized, is less than the annual maximum, use the maximum annual deduction(s) in that pay period.
K2P Provincial or territorial Canada Pension Plan contributions and employment insurance premiums tax credits for the year (the lowest provincial or territorial tax rate is used to calculate this credit). If an employee reaches the maximum CPP or EI for the year with an employer, the instructions in the note for the K2 factor also apply to the K2P factor. For employees paid by commission, use the federal K2 formula for commissions and replace the lowest federal rate in the K2 formula with the lowest provincial or territorial tax rate.
K2Q Quebec Pension Plan contributions, employment insurance premiums, and Quebec Parental Insurance Plan premiums federal tax credits for the year (the lowest federal tax rate is used to calculate this credit)
K3 Other federal tax credits (such as medical expenses and charitable donations) authorized by a tax services office or tax centre
K3P Other provincial or territorial tax credits (such as medical expenses and charitable donations) authorized by a tax services office or tax centre
K4 Canada employment credit (the lowest federal tax rate is used to calculate this credit)
K4P Provincial or territorial Canada employment credit (only applies to Yukon)
L Additional tax deductions for the pay period requested by the employee or pensioner as shown on Form TD1
LCF Federal labour-sponsored funds tax credit
LCP Provincial or territorial labour-sponsored funds tax credit (only applies to New Brunswick, Newfoundland and Labrador, Nova Scotia, Manitoba, Saskatchewan, British Columbia, and Yukon)
M Accumulated federal and provincial or territorial tax deductions (if any) to the end of the last pay period
M1 Year-to-date tax deducted on all payments included in B year-to-date
N The number of days since the last commission payment. The minimum basic exemption amount of $67.30 is included in the formula in line with CPP legislation
P The number of pay periods in the year
PI Pensionable income for the pay period, or the gross income plus any taxable benefits for the pay period, including bonuses and retroactive pay increases where applicable
PR The number of pay periods left in the year (including the current pay period)
R Federal tax rate that applies to the annual taxable income A
S Provincial tax reduction (only applies to Ontario and British Columbia)
S1 Annualizing factor
T Estimated federal and provincial or territorial tax deductions for the pay period
T1 Annual federal tax deduction
T2 Annual provincial or territorial tax deduction (except Quebec)
T3 Annual basic federal tax
T4 Annual basic provincial or territorial tax
TB Tax deductions, i.e., bonuses or retroactive pay increases, payable now
TC “Total claim amount” reported on federal Form TD1. If Form TD1 is not filed by the employee or pensioner, TC is the basic personal amount, and for non-resident individuals, TC is $0. If the claim code is E, T = $0. If the province is Ontario, even if the claim code is E, the Ontario Health Premium is payable on annual income over $20,000
TCP “Total claim amount” reported on the provincial or territorial Form TD1. If that form is not filed, TCP is the provincial or territorial basic personal amount
U1 Union dues for the pay period paid to a trade union, an association of public servants, or dues required under the law of a province to a parity or advisory committee or similar body
V Provincial or territorial tax rate for the year (does not apply to Quebec, outside Canada, or in Canada beyond the limits of any province or territory)
V1 Provincial or territorial surtax calculated on the basic provincial or territorial tax (only applies to Ontario and Prince Edward Island)
V2 Additional tax calculated on taxable income (only applies to Newfoundland and Labrador’s Temporary Deficit Reduction Levy and the Ontario Health Premium)
Y Additional provincial or territorial tax reduction based on applicable amounts reported on the provincial or territorial Form TD1
YTD Year-to-date

Chapter 3 – Option 1 – Tax formula

Formula to calculate annual taxable income (A)

As the formula to calculate the annual taxable income and the explanatory variables have not changed, they have not been reproduced.

Formula to calculate basic federal tax (T3)

As the formula to calculate the basic federal tax and the explanatory variables have not changed, they have not been reproduced.

Formula to calculate annual basic provincial or territorial tax (T2)

As Prince Edward Island is the only province to have changes, we are only reproducing their calculations.

Prince Edward Island

T2 =T4 + V1 − S − LCP

If the result is negative, T2 = $0.

Where:

T4 = (V × A) − KP − K1P − K2P − K3P

Where V and KP are based on the value of A in the 2018 Prince Edward Island tax rates and income thresholds

2018 Prince Edward Island tax rates and income thresholds
Annual taxable income (A)
More than – Not more than ($)
Rate
(V)
Constant ($)
(KP)
0 – 31,984 9.8% 0
31,984 – 63,969 13.8% 1,279
63,969 – and over 16.7% 3,134

K1P = 0.098 × TCP

Where:

TCP = The total of personal non-refundable tax credits amounts reported on Form TD1PE. If Form TD1PE is not filed, TCP is $9,160.

K2P = [(0.098 × (P × C, maximum $2,593.80)) + (0.098 × (P × EI, maximum $858.22))]*

* Refer to the glossary for K2 and K2P if an employee reaches the maximum CPP or EI for the year.

V1 = Where T4 ≤$12,500,

V1 = $0

Where T4 > $12,500,

V1 = 0.10 × (T4 − $12,500)

S and LCP = $0

Chapter 4 – Option 2 – Tax formula based on cumulative averaging

There are no changes to the federal tax rates, income thresholds, or personal amounts required for July 1, 2018.

Formula to calculate provincial and territorial tax payable (T2)

As Prince Edward Island is the only province to have changes, we are only reproducing their calculations.

Prince Edward Island

T2 = T4 + V1 − S − LCP

If the result is negative, T2 = $0.

Where:

T4 = (V × A) − KP − K1P − K2P − K3P

Where V and KP are based on the value of A in the 2018 Prince Edward Island tax rates and income thresholds table.

2018 Prince Edward Island tax rates and income thresholds
Annual taxable income (A)
More than – Not more than ($)
Rate
(V)
Constant ($)
(KP)
0 – 31,984 9.8% 0
31,984 – 63,969 13.8% 1,279
63,969 – and over 16.7% 3,134

K1P = 0.098 × TCP

Where:

TCP = The total of personal non-refundable tax credits amounts reported on Form TD1PE. If Form TD1PE is not filed, TCP is $8,660.

K2P = [(0.098 × (P × C, maximum $2,593.80)) + (0.098 × (P × EI, maximum $858.22))]*

* Refer to the glossary for K2 and K2P if an employee reaches the maximum CPP or EI for the year.

V1 = Where T4 ≤ $12,500,

V1 = $0

Where T4 > $12,500,

V1 = 0.10 × (T4 − $12,500)

S and LCP = $0

Report a problem or mistake on this page
Please select all that apply:

Thank you for your help!

You will not receive a reply. For enquiries, contact us.

Date modified: