Self-Employment: Set Aside Tax and Contributions
Separate gross revenue from spendable cash and set aside estimated tax and contributions every month.
Published 2026-07-21
Self-employment's first trap is not income variability: it is income's appearance. Receipts look like a salary, whereas a salary arrives already stripped of tax, public-plan contributions and benefits; the self-employed worker's gross must fund all of that itself, including the double share of public plans carried alone. Spending the gross means spending the tax authority's money, and April's letter says so brutally. The remedy is plumbing: the moment a client pays, a percentage calibrated from the previous return — often 25% to 30% — moves automatically into a reserved, untouchable account, from which the instalment payments are made without stress, deadlines confirmed on the calendar. Each notice of assessment's gap readjusts the percentage. This article calibrates the reserve by profile, installs the automatic transfers and dismantles the classic mistakes of the first good year — starting with the one that mistakes revenue for pay.
Stop confusing receipts with income
Self-employment's founding trap is optical: client deposits look like a salary, whereas a salary arrives already net of withholdings. The self-employed gross must itself fund income tax at both levels of government, public-plan contributions — employee and employer shares combined, since the status stacks both — and the business expenses. The true disposable income often represents two thirds of the receipts, sometimes less: spending the gross means spending the tax authority's money, and the bill arrives with a good year's first return. The mental conversion happens once and for all: every client deposit contains a share that never belonged to you, and the plumbing must treat it accordingly.
Calibrate the reserve percentage
The percentage to set aside is calibrated on real numbers: the previous year's return gives the total tax and contributions paid, set against gross income — a starting point that foreseeable changes adjust, growing revenue, evolving expenses. The common ranges, twenty-five to thirty percent of gross for middle incomes, more at high incomes, serve as the first-year benchmark, before your own history takes over. The calibration refines at every notice of assessment: the gap between the accumulated reserve and the real bill corrects the next cycle's percentage, the estimate converging within two or three years toward comfortable precision. The right percentage does not exist in advance; it is built through documented iteration.
Automate the withholding at the source
The reserve works on one condition: automation. The moment a client pays, the calibrated percentage moves to a separate account, untouchable by personal convention, before any other assignment — reproducing the source withholding the status does not provide. The deferred manual transfer fails predictably: visible money gets spent, and the reserve falls behind precisely in the good months, when the tax bill grows. The reserved account is chosen without a card or temptation, a distinct savings account sufficing, its growing balance becoming a health indicator along the way: a reserve tracking the receipts' rhythm certifies the tax authority's share is provisioned, whatever spring holds.
Tame the instalment payments
Instalment payments enter the self-employed life after the first profitable year: the tax authority, unable to withhold at source, requires payments through the year, at the prescribed quarterly deadlines, calculated on past years under the permitted methods. Their bad reputation is undeserved: they are not extra tax but the same tax paid as the year goes, and the automated reserve makes them painless, the money waiting for precisely that in the reserved account. The deadlines are confirmed on the calendar from the first notice, late payments costing interest, on-time ones never. The complete system — automatic reserve plus instalments paid from it — reproduces a salaried worker's tax life: collected as you go, without April's brutal letter.
Quebec scenario: compare before confirming
A consultant in Chandler ends her first good year with a brutal letter: $11,400 owed in tax and contributions, and nothing set aside. The mistake was never the spending but an optical illusion: the $7,000 landing each month looked like a salary, whereas a salary arrives already stripped of tax, public-plan contributions and benefits. Her gross receipts had to fund all of that themselves. The rebuild goes through the plumbing. Every client payment now lands in a business account; the same day, 27% moves automatically to a separate, untouchable account, calibrated from her previous return to cover tax and contributions, including the double share of public plans a self-employed worker carries alone. What remains pays business expenses, then a fixed biweekly transfer plays the role of a personal paycheque. The instalment payments, whose deadlines she confirms on the calendar, are paid from the reserved account without emotion or surprise. Eighteen months later, the notice of assessment arrives with a $212 balance: the gap between estimate and reality, which she folds back into her percentage. The brutal letter stays pinned to the corkboard, as a preventive measure.
Checklist
- Stop treating receipts as salary
- Calibrate the reserve percentage from the past return
- Move the tax share at every client payment
- Make the reserve account untouchable
- Pay yourself a fixed salary from the business account
- Confirm instalment deadlines on the calendar
- Pay instalments from the reserve
- Readjust the percentage after each notice
- Keep the reserve even through good months
Frequently asked questions
Why aren't my receipts my salary?
Because a salary arrives already stripped of tax, public-plan contributions and benefits: your gross receipts must fund all of that themselves, including the double share of public plans a self-employed worker carries alone. Spending the gross means spending the tax authority's money.
What percentage should be set aside, and where?
Often 25% to 30%, calibrated from your previous return, transferred automatically into a separate, untouchable account the moment the client pays. The percentage readjusts after each notice of assessment: last year's gap corrects this year's estimate.
How do I handle instalment payments without stress?
Confirm the deadlines on the calendar as soon as they apply, and pay them from the reserved account: the money is already waiting there. Instalments are not extra tax but the same tax paid through the year. Missing them costs interest; paying them never does.