Four-Day Week: What Your Net Pay Really Loses

Your employer says yes to the four-day week, but at 80% of the salary. On paper, you are giving up a fifth of your pay. In your bank account, the drop is much smaller — because the slice of salary you give up is the most heavily taxed one of all.

The deal: four days for 80% of the salary

The most common arrangement is simple: one workday less, a pay cut in proportion. Five days become four, and the salary falls to 80% of what it was.

Here is a worked example, with a round salary so the math stays readable: $70,000 a year in Quebec, five days a week. Pro-rated, four days come to $56,000. That is $14,000 less gross over the year.

But that is not the real question. The real question is how much of that $14,000 you would ever have seen.

Why your net pay drops more slowly than your gross

The last slice of salary is the most heavily taxed

Income tax is progressive, federally and in Quebec. Your income is cut into brackets, and each bracket has its own rate. So you do not pay one single percentage on everything you earn: a low rate applies to the first dollars, a higher rate to the ones after that.

Your marginal rate is the rate that hits the last dollar earned. And since that last dollar is exactly what you give up by moving to four days, it is the one that sets the bill.

At $70,000 you sit in the 20.5% federal bracket, which covers income from $58,523 to $117,045. Quebec residents do not carry that rate in full. The Quebec abatement, held at 16.5% for 2026, automatically takes a share off your federal tax, because Quebec collects part of personal income tax itself. The federal rate actually paid on that slice therefore works out to roughly 17%.

Then comes Quebec tax. At $70,000 you are in Quebec's second bracket, the one starting just above the $54,345 threshold published by the Ministère des Finances du Québec. The Salarium calculator applies 19% to that bracket.

Add the two pieces together and the combined marginal rate reaches 36.1% at $70,000. On the last $100 earned, $36 was never yours.

At $56,000 the picture changes. You drop back below $58,523, and therefore below the 20.5% federal bracket, and the combined marginal rate falls to 30.7%. The cut crosses a bracket boundary: its upper part was taxed more heavily than its lower part.

Payroll contributions follow, but not all of them

Three contributions come off a Quebec pay stub on top of income tax: the Quebec Pension Plan (QPP), Employment Insurance and the Quebec Parental Insurance Plan (QPIP). They are calculated on your salary, so they fall when it falls — but only within a certain range.

Each one has a ceiling above which it stops growing. Maximum pensionable earnings are $74,600 for 2026, with a basic exemption of $3,500 on which nothing is withheld. On the Employment Insurance side, insurable earnings are capped at $68,900, at the Quebec rate of 1.30%, or $895.70 at most for the year.

That ceiling matters directly here: at $70,000 you were already paying the maximum Employment Insurance premium. The slice of salary between $68,900 and $70,000 carried no Employment Insurance premium at all — so there was nothing to save on that side by giving it up.

The math, before and after

Five days: $70,000 gross

Net pay comes to $51,185 a year, or about $4,265 a month. The average withholding rate — what all the deductions together represent against gross pay — is 26.9%.

Four days: $56,000 gross

Net pay falls to $42,930, or about $3,577 a month, for an average rate of 23.3%. That average rate drops because the basic tax credits do not move: they weigh more heavily against a smaller salary.

What the day off really costs

The two columns side by side:

Gross pay falls by 20%. Net pay falls by only 16%.

Of the $14,000 in salary given up, $5,744 would never have reached you: it went to tax and contributions. The real loss is $8,256, or 59% of the headline cut. The remaining 41% was already being withheld before you ever saw the money.

Run the numbers on your own salary with the Quebec net salary calculator: enter your current gross, then the pro-rated gross, and compare the two net figures.

What the calculation leaves out

Three things the comparison above does not cover, and that can matter as much as tax.

• Your social entitlements fall too. A lower salary means lower QPP contributions, so lower earnings recorded in your retirement file. The same logic applies to Employment Insurance and QPIP, whose benefits are calculated on insurable earnings.
• Not every benefit shrinks in proportion. Group insurance, employer pension plan, vacation, sick days: some follow the salary, others follow your status or your hours. That is something to check line by line with the employer, not to assume.
• Four days does not always mean fewer hours. Some arrangements compress the same week into longer days, with no pay cut. In that case none of the above applies: gross pay does not move, and neither does net pay.

If you are weighing two arrangements, or two employers, the method is the same one used to compare two job offers in Quebec: compare net figures, never gross ones.

Questions to ask before you sign

1. Is the pay cut genuinely pro-rated, or is the employer offering better than 80%?
2. What exact annual gross will the contract state? It is that amount, not a percentage, that you enter into a calculator.
3. Are pension plan contributions and group insurance kept at the full-time level?
4. Are vacation and leave counted in days or in weeks? Four days of leave is a full week in a four-day week.
5. Is the arrangement reversible, and on what terms?

One last benchmark, for this example: every $1,000 of gross pay given up costs about $590 of net pay. Multiply that by the cut on the table before you say yes or no.