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A pre tax deduction comes off your income before tax is figured, so each dollar saves you tax at your top rate. On an $80,000 salary in Ontario, a $5,000 RRSP contribution cuts income tax by $1,482.50. The same $5,000 saves $1,102.50 on $50,000 and $2,170.47 on $150,000.
Which pay stub items are really pre tax?
Fewer than you’d think.
Your pay stub shows a pile of deductions, and only some of them lower the income that gets taxed, which is why two people with the same gross pay can end up with very different tax bills at filing time.
Contributions to a registered pension plan are the clearest case. They show in box 20 of your T4, and you claim them on line 20700 of your return. RRSP money you pay in through payroll works the same way, but the claim goes on line 20800. Employer-paid health and dental coverage under a private health services plan is not a taxable benefit for you, so it never lands in your income at all.
What about CPP and EI? They come off your cheque, but they aren’t the deductions this page is about. The payroll deductions calculator shows each of them on its own line.
What can you deduct, and how much room do you get?
Only a few plans hand you a deduction on your own tax return. This table lists the ones with published limits.
| Plan | Where you claim it | Limit |
|---|---|---|
| Registered pension plan | Line 20700 | Set by your plan, shown in box 20 of your T4 |
| RRSP | Line 20800 | 18% of last year’s earned income, up to $33,810 for 2026 ($32,490 for 2025) |
| FHSA | Deduction on your return | $8,000 a year, $40,000 over a lifetime |
The two RRSP dollar limits appear on the CRA’s registered plans administrators update page. Your pension adjustment lowers your RRSP room dollar for dollar. If you have a workplace pension, your own number will be smaller than the headline one. You’ll find it on your latest notice of assessment.
How much tax does a pre tax deduction save?
Your bracket sets the saving, so it grows with your pay. We ran a $5,000 contribution through our engine for an Ontario employee with no other deductions, and the gap between the low and high earner is bigger than most people guess.
| Salary | Income tax before | Income tax after | Tax saved |
|---|---|---|---|
| $50,000 | $6,273.31 | $5,170.81 | $1,102.50 |
| $80,000 | $14,127.85 | $12,645.35 | $1,482.50 |
| $150,000 | $39,910.59 | $37,740.11 | $2,170.47 |
So the $5,000 really costs the $80,000 earner $3,517.50. Not bad, though it’s a deferral. Money you take out of an RRSP later counts as income, and the RRSP calculator lets you try your own figures.
Want to see the effect on your marginal rate first? The marginal tax rate calculator shows what the next dollar costs at your income.
Is a deduction the same as a tax credit?
No, and mixing them up is common. A deduction lowers the income you’re taxed on, so its value depends on your bracket. A credit comes off the tax itself. That’s why the same $5,000 saves $1,102.50 for one person and $2,170.47 for another. Pre tax means deduction, not credit.
Do you see the saving right away?
Not always. A pension contribution through payroll usually shrinks the taxable pay on each cheque, so the saving shows up in your take-home pay straight away. An RRSP deposit you make on your own usually waits until you file, and it arrives as a bigger refund or a smaller balance owing. If your employer takes RRSP money straight from your pay, ask whether they can lower the tax withheld on each cheque as well. Otherwise you’re lending the government the saving until spring.
What goes wrong with pre tax deductions?
Overshooting is the classic one. The CRA lets you go $2,000 over your RRSP room, and above that it charges 1% a month on the excess until you fix it.
Timing trips people up too. Contributions made in the first 60 days of the year can count for the year before. For the 2025 return the cutoff was 2 March 2026. No official date for the 2026 return was published when this was checked, so confirm it before you rely on it.
A deduction isn’t a refund, either. It lowers a bill you’d otherwise pay.
And withdrawals bring the tax back. Outside Quebec, the bank withholds 10% on RRSP withdrawals up to $5,000, 20% from $5,001 to $15,000 and 30% above that. That is only withholding, and the real tax is settled when you file. The RRSP withdrawal tax calculator shows what a given withdrawal costs.
Our sources
The limits and dates come from the CRA‘s pages on RRSP limits and the 2025 deduction line, and from the CRA’s FHSA pages. The tax figures in the tables are the estimates from our own calculators, using 2026 Ontario and federal rates. They cover one salary and one contribution, with no other credits.
Frequently asked questions
What does pre tax mean on a pay stub?
It means the amount is taken off before income tax is worked out. A registered pension plan contribution is one example.
Is an RRSP contribution a pre tax deduction?
Yes, once you claim it on line 20800. A $5,000 contribution saves $1,482.50 for an Ontario employee on $80,000.
Are CPP and EI pre tax?
Not in the sense used here. They come off your pay, but the deductions that cut your taxable income are the ones like pension and RRSP contributions.
What is the RRSP limit for 2026?
The dollar limit is $33,810, or 18% of last year's earned income if that is lower, less any pension adjustment.
Is employer health and dental coverage taxed?
Employer-paid coverage under a private health services plan is not a taxable benefit for you, per the CRA.
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