Updated Checked by the Tax-Services.ca editorial team How we check
A tax withholding estimator shows if your employer is sending the CRA too much or too little from each pay. On a $75,000 salary in Ontario, paid every two weeks, about $488.64 of income tax comes off each cheque, roughly $12,705 across the year.
How does withholding work for an employee in Canada?
Your employer doesn’t guess. They take the pay period, your province and the numbers on your TD1 form, then run them through the CRA’s payroll formulas. The TD1 is the form you hand in when you start a job. It lists the credits you’re claiming, and the basic personal amount is already built in.
That withholding is a prepayment, not the final bill. You settle the real number when you file. If too much came off, you get a refund. If too little did, you owe by April 30 for the 2025 return, and no published date for 2026 turned up yet.
Your pay stub shows the year-to-date income tax, CPP and EI, so you don’t need to hunt for numbers. Look for the line labelled income tax and the gross pay beside it.
So an estimator has one job: compare the tax you’ll owe for the year with the tax that’s being withheld.
Where can you check your own withholding?
The CRA runs the Payroll Deductions Online Calculator, usually called PDOC. It works out tax, CPP and EI for most pay periods in every province except Quebec, and its figures were updated for July 2026. Quebec workers have to use Revenu Quebec’s own tool. PDOC is built for employers, but nothing stops you from using it on your own pay.
Our payroll deductions calculator does the same sort of job with a friendlier layout. On $2,884.62 gross every two weeks, it shows $317.64 of federal tax, $171.00 of Ontario tax, $163.33 of CPP and $43.20 of EI. Your net pay is $2,189.46.
Pay stubs vary by a few dollars, especially late in the year, when CPP and EI hit their annual limits and stop coming off. That’s why your December paycheque can look fatter than the one in March.
Are you paying too much, or too little?
Do the check in spring and again around September, while there’s still time to change something before December.
Take the annual tax from the income tax calculator and set it against your year-to-date tax on the stub, projected to December. Here’s a worked case.
| Item | Amount |
|---|---|
| Salary | $75,000 |
| Federal and Ontario tax for the year | $12,704.65 |
| Tax withheld in the calculator’s default case | $14,000.00 |
| Estimated refund | $1,295.35 |
That’s an overpayment of about $108 a month. It’s an interest free loan to the government, and most people would rather have the cash. The tax refund calculator runs this comparison for any income you type in.
The other direction hurts more. Someone earning $65,000 who had only $6,000 withheld owes $3,725.50. A second job is one way to end up there, and unreported side income is another.
What if you want less tax taken off each pay?
Two routes exist, and they work differently.
The first is an RRSP through payroll. Put $200 into your RRSP each pay and, in the same example, federal tax drops to $276.64 and Ontario tax to $146.93. That’s $65.07 less tax per cheque, so the RRSP costs you $134.93 of take-home, not $200. Your employer has to offer payroll contributions, and you’ll want your RRSP room number first.
The second is Form T1213, Request to Reduce Tax Deductions at Source. The CRA’s T1213 page describes it for deductions or non-refundable credits that the TD1 doesn’t cover. It needs the CRA’s approval, and the form page doesn’t state how long that takes, so don’t count on it before your next cheque.
Should you bother? If your refund is a few hundred dollars, probably not. A larger one, such as $2,000 or more from childcare or RRSP claims, is worth a look.
Should you just wait for the refund?
Some people like the forced saving. Maya in Hamilton says her April refund is her only real vacation fund, and she’d never set that money aside if it landed in her account each pay. That’s a fair reason to leave things alone. The cost is that you lent the government a bit of your money for free, so it comes down to whether you’d actually save the extra take-home.
What mistakes throw the estimate off?
A stale TD1 is the usual one. If your circumstances changed, say you took a second job or your credits ended, the form on file is still the old story. A bonus is another. A bonus can change your tax for the year, and the take-home pay calculator shows only the steady salary, so add the extra income separately.
The self-employed have no employer to do this, so they pay tax instalments instead. The calculator uses a $3,000 threshold, and the CRA’s dates are March 15, June 15, September 15 and December 15.
Where do these numbers come from?
Rates, credits and limits come from the Canada Revenue Agency‘s 2026 tax and payroll pages, including the T4127 payroll formulas and the T1213 form page. Worked figures were run through our own calculators. The estimates leave out benefits, union dues and credits beyond the basic personal amount, and how withholding treats bonuses wasn’t checked. This site isn’t affiliated with the CRA.
Frequently asked questions
Does my employer choose how much tax to withhold?
No. They use the CRA's payroll formulas, your province, your pay period and the credits on your TD1 form.
Is there an official CRA tool to check withholding?
Yes. The Payroll Deductions Online Calculator covers every province and territory except Quebec.
Can I ask for less tax to be taken off my pay?
Yes, with Form T1213 for deductions or credits the TD1 doesn't cover. It needs CRA approval first.
Why do I owe tax if I have a regular job?
A second job or side income can do it, because withholding is only an estimate. You settle the real amount when you file.
Are RRSP payroll contributions taxed?
Withholding drops when your employer takes them from pay. In our $75,000 example, a $200 contribution cuts tax by $65.07 per cheque.
- How Canadian income tax works: brackets and credits
How federal and provincial Canadian income tax stack up, what marginal and average rates mean, and how credits and deductions change your bill