Being paid under the table means taking your money in cash, with nothing declared and nothing deducted. At first it looks simple: earn $40,000, keep $40,000, pay no tax. The real math is less flattering. What declared work holds back from your pay isn't money lost — part of it is what earns you a pension, benefits and proof of income. Here's what each option actually gives you, with the numbers.
Cash work: what are we really talking about?
The official term is the underground economy. According to the Canada Revenue Agency, it covers "unreported economic transactions, which circumvent the tax laws." In plain words: any income earned but never put on a tax return.
It isn't just the envelope of bills on a renovation job. It also includes:
- a contractor or worker paid in cash who doesn't report the amount;
- tips earned on top of your wage (see our article on how tips are taxed);
- side income from renting out a room or ride-sharing;
- bartering, when you trade one service for another.
The common thread: the money exists, but the tax system can't see it. For now.
The "I keep it all" illusion
Take a $40,000 salary, declared normally in Quebec. Part of it goes to deductions before your pay ever reaches you. Here's the breakdown, calculated by the Salarium engine:
| What gets withheld | Annual gross | Share of gross |
|---|---|---|
| Federal tax | −$2,403 | 6.0% |
| Provincial tax | −$2,528 | 6.3% |
| QPP | −$2,300 | 5.7% |
| Employment Insurance | −$520 | 1.3% |
| QPIP | −$172 | 0.4% |
| Total withheld | −$7,922 | 19.8% |
| Annual net | $32,078 | 80.2% |
Out of that $40,000, about $32,000 is left as net pay — roughly $2,670 a month. The difference, around $8,000, splits between federal income tax, Quebec income tax and three payroll contributions: the Quebec Pension Plan (QPP), Employment Insurance (EI) and the Quebec Parental Insurance Plan (QPIP).
Keep one distinction in mind. Income tax funds public services and doesn't come back to you directly. But the three contributions buy rights in your name — a pension, benefits. That is exactly what cash work makes you skip. (To understand each line, see how to read a Quebec pay stub.)
What cash work really costs you
Paid in cash with nothing declared, you keep the whole amount today. But you give up everything those contributions were building.
A smaller retirement pension
The QPP isn't a tax: it's your future pension. The Canada Revenue Agency says it plainly — "if you only work in Quebec, you contribute to the Québec Pension Plan," and "your pension will increase based on how much and for how long you contribute." No contribution, no pension. Every year paid under the table is a year that doesn't count toward your retirement.
No Employment Insurance
EI is deducted only from insurable employment — in Quebec, 1.30% of your wage up to $68,900 in 2026. With no declared job you don't contribute, and above all you have no claim: lose your livelihood and there is no benefit to cushion the blow.
No paid parental leave
Same logic for QPIP, which funds maternity, paternity and parental leave. It is based on declared earnings. Invisible income gives no right to any benefit the day a child arrives.
No way to prove what you earn
Unreported income appears on no paperwork. The result: no proof of income for a mortgage application, a car loan or even a lease. And because the tax system doesn't see this income, some income-tested credits (the GST credit, child benefits) rest on a false picture — a later reassessment is never off the table.
No coverage if you're hurt
A worker paid under the table on a job site is covered by no workplace-injury insurance. The injury, though, is very real.
The tax system catches up: the legal risk
Unreported income doesn't vanish; it stays owing. The underground economy is illegal, and the Canada Revenue Agency lists the possible consequences: "criminal charges," "court-imposed fines," "a jail term" and "a criminal record." On top of that come back taxes, interest and penalties — federally and in Quebec, since both governments tax the same income.
The risk math is simple: the savings you make today can turn, a few years later, into a bill much heavier than the tax you tried to avoid.
The real math, side by side
| On $40,000 earned | Declared | Paid in cash |
|---|---|---|
| In your pocket right away | ~$32,000 net | $40,000 |
| QPP pension | Yes, it builds up | None |
| EI / QPIP | Covered | No entitlement |
| Proof of income (loan, lease) | Yes | No |
| Legal risk | None | Charges, fines, interest |
So the "real" gain from cash work isn't $8,000. It's $8,000 today against a pension, a safety net and peace of mind — rarely a winning trade over time.
Frequently asked questions
Do I really “earn” more when I'm paid in cash?
In the moment, yes — you keep the full amount. But you lose your QPP pension, Employment Insurance and QPIP, any proof of income, and you expose yourself to a tax reassessment with interest and penalties. Over a few years, the gap closes, or even reverses.
Which income has to be declared?
All of it: wages, self-employment, tips, rental or ride-sharing income, and even bartering. The Canada Revenue Agency treats any income earned but not reported as the underground economy.
How much is left net on a declared $40,000 salary in Quebec?
About $32,000 a year, roughly $2,670 a month, once federal tax, Quebec tax, QPP, EI and QPIP are taken out. You can check your own figure with the Salarium calculator.
What do I risk if I don't declare income?
The tax stays owing and is added back, with interest and penalties. In the most serious cases, the CRA cites criminal charges, fines, a jail term and a criminal record.
Does cash work affect my retirement?
Yes. The QPP pension is built on your contributions. A year that isn't declared doesn't count, which lowers your future pension accordingly.