A large tax bill at filing time can put pressure on a household or business budget. That is why the question, when are tax instalments due, matters well before spring tax season. For many Canadians, instalments are the Canada Revenue Agency’s way of collecting income tax gradually during the year rather than waiting for one full payment after a return is filed.

If you receive a CRA instalment reminder, do not assume it is a penalty or a bill that can be ignored. It is a signal that the CRA expects you may owe enough tax again this year to make advance payments. Understanding the dates, the amount options, and your actual income situation can help you pay with confidence while protecting your cash flow.

When are tax instalments due for individuals?

For most individuals, personal income tax instalments are due four times a year:

• March 15
• June 15
• September 15
• December 15

These dates apply to the calendar tax year. If a due date falls on a weekend or a recognized federal holiday, the payment is generally considered on time when the CRA receives it on the next business day.

Each payment represents an advance toward the income tax you may owe for the year. This can apply to self-employed professionals, landlords, investors, retirees with taxable income, gig workers, and employees whose tax deductions at source do not cover their full tax obligation.

For example, a consultant may have little or no income tax withheld from client payments. Instead of setting aside all the tax until filing season, they may be required to send four instalments throughout the year. Someone with substantial rental income or investment income may face the same requirement, even if they also have employment income.

A special rule for farmers and fishers

Individuals whose main source of income is farming or fishing generally have a different schedule. If they are required to pay instalments, they can usually make one payment due on December 31 rather than four quarterly payments. Their tax return filing and balance-payment deadlines can also differ, so it is wise to confirm the details for the specific tax year.

Who needs to pay tax instalments?

You may need to pay personal tax instalments if your net tax owing is more than $3,000 for the current year and was more than $3,000 in either of the previous two tax years. For Quebec residents, the threshold is generally $1,800.

Net tax owing is not simply your total income. It is the tax you owe after accounting for tax already withheld, tax credits, and certain other amounts. This distinction matters. A salaried employee earning a strong income may not need instalments if enough tax comes off every paycheck. A person with a lower income but no withholding could need them.

The CRA often sends instalment reminders to people it believes may be required to pay. However, receiving a reminder does not always mean the suggested amount is the best amount for your current circumstances. A change in income, deductions, business expenses, or tax withheld can make a major difference.

If this is your first year of self-employment, you may not receive a reminder right away. That does not mean tax has disappeared. Set money aside as income arrives so you are prepared for your eventual balance owing and for possible instalments in later years.

How does the CRA calculate instalment amounts?

The CRA reminder commonly provides suggested payment amounts based on your prior tax information. You generally have three ways to calculate what to pay: the no-calculation option, the prior-year option, and the current-year option.

The no-calculation option means paying the amounts shown on the CRA reminder by each due date. It is simple and can reduce the risk of underpaying when your income will be similar to last year.

The prior-year option uses your net tax owing from the previous year to determine this year’s payments. This can be helpful if your most recent return does not reflect your typical income, such as after a one-time bonus, property sale, or unusually profitable business year.

The current-year option estimates what you expect to owe for the present year. It may suit someone whose income has fallen, who has increased deductible business expenses, or who expects more tax to be withheld. The trade-off is that the estimate needs to be realistic. If you pay too little and your final tax owing is higher than expected, instalment interest may apply.

There is no prize for choosing the highest payment amount. Paying too much may result in a refund or credit later, but that money could have supported an emergency fund, payroll, debt reduction, or family goals during the year. The aim is a well-supported estimate that meets your tax obligations without unnecessarily straining your budget.

What happens if you miss a tax instalment due date?

Missing a due date can lead to instalment interest. The CRA calculates interest based on the amount that should have been paid and how late the payment was. Rates can change, so delaying a payment is rarely a cost-free choice.

In some situations, an instalment penalty may also apply if the instalment interest is high enough. This is separate from the interest charged on an unpaid balance after your income tax return is due. In other words, waiting until tax filing season to pay may create more than one cost.

If you know you will not have the full amount by the deadline, paying what you can as soon as possible is generally better than making no payment. Then review your projected income and expenses to determine whether your remaining instalments should be adjusted. If the issue is ongoing, get support early rather than allowing several missed dates to accumulate.

How to plan for instalments without disrupting your budget

Instalments work best when they become part of your regular financial routine. Self-employed Canadians can transfer a percentage of each client payment into a separate savings account designated for income tax. Landlords may reserve a portion of monthly net rental income. Retirees and investors can review whether withholding on taxable payments is enough for the year.

Your plan should also account for the fact that income is not always predictable. A seasonal business may earn most of its revenue in a few months, while a contractor may experience gaps between projects. In those cases, a quarterly review is more useful than relying on one estimate made in January.

Review your position before each instalment date and ask a few practical questions: Has income changed? Have you added deductible expenses? Did you make RRSP contributions or face a significant taxable event? Is more tax being withheld elsewhere? These changes can affect the amount that makes sense to pay.

Keep clear records of each payment, including the date, amount, and confirmation number. This is especially helpful for business owners managing bookkeeping, payroll, GST/HST obligations, and personal taxes at the same time. Accurate records make it easier to reconcile payments when preparing your return.

Personal instalments versus corporate tax instalments

Business owners should not assume that personal and corporate instalment schedules are identical. A corporation generally pays tax instalments monthly, with payments due on the last day of each month. Some eligible Canadian-controlled private corporations may be able to pay quarterly instead.

Corporate instalment rules depend on factors such as the corporation’s taxable income, prior-year tax payable, and eligibility conditions. The corporation’s fiscal year-end also affects timing, unlike personal income tax instalments, which follow the calendar year. If you operate through a corporation and also receive self-employment, rental, dividend, or other personal income, you may have obligations at both levels.

This is where coordinated tax and bookkeeping support can be valuable. A payment that looks manageable in isolation may compete with payroll, sales tax remittances, insurance costs, loan payments, or planned investments. Looking at the whole financial picture helps prevent a compliance deadline from becoming a cash-flow surprise.

Paying the CRA on time

The CRA offers several payment methods, including online banking, pre-authorized debit, and payments through participating financial institutions. Whichever method you choose, allow enough processing time. A payment initiated on the due date may not always be received on the due date, depending on the method and your financial institution.

Pre-authorized debit can be useful for people who want a scheduled approach, but it still requires sufficient funds in the account. Online payments offer more control if your income varies, provided you do not leave the decision until the last minute.

Tax instalments are not meant to make financial life harder. They are a predictable obligation that becomes more manageable when it is built into your monthly plan. If your income has changed or a CRA reminder does not reflect your situation, a qualified tax professional can help you assess the numbers before the next due date – and leave more room for the goals your income is meant to support.