Tax Instalments Planner Canada 2026

Tax instalments are payments you make during the year toward the tax you would otherwise pay in a lump sum by April 30 of the following year. They work like employer payroll withholding when your income is not fully taxed at source — self-employment, rental, investments, or multiple jobs.

CRA sends instalment reminders (form INNS1) in February (for March and June) and August (for September and December) when it expects you to pay. You can view them in CRA My Account under Accounts and payments → Instalments.

Instalments are not a separate tax. They are prepayments of your personal income tax (and, when included in the instalment base, self-employed CPP and voluntary EI). Any overpayment becomes a refund or credit when you file; any shortfall is due with your return.

Two factors decide it: (1) net tax owing for 2026 is more than $3,000 — or $1,800 if you live in Quebec on December 31 — and (2) net tax owing in 2025 or 2024 also exceeded that threshold.

If your 2026 net tax will be at or under the threshold, you generally do not have to pay instalments even if you received a reminder. CRA’s Hugh example (Alberta) shows how extra pension withholding can drop estimated net tax to $500 and remove the instalment obligation.

Province or territory of residence on December 31 controls which threshold applies for federal CRA instalments. Quebec residents also deal with Revenu Québec for provincial tax — that is a separate remittance system.

For the threshold test, CRA looks at net tax owing — roughly tax payable after non-refundable credits and after amounts already withheld or paid, not your entire tax before withholdings. A high-income employee with enough T4 withholding can owe little or nothing at filing and never hit the instalment threshold.

Use your Notices of Assessment for prior years and a realistic estimate for the current year. The official Calculation chart for instalment payments walks line-by-line through tax, credits, withholdings, then adds CPP payable and voluntary EI to get the total instalment base used for prior-year and current-year options.

Self-employed CPP (and voluntary EI) are not part of “net tax owing” for the threshold test, but they are added when you calculate how much to pay under the prior-year or current-year options.

No-calculation: pay the amounts CRA prints on your reminder. Safest for interest protection when income is stable or rising. CRA builds March/June from the second-preceding year and September/December so the year’s payments track the prior year’s assessed amount.

Prior-year: base equal quarters on your 2025 instalment base (net tax + CPP/EI). Useful when this year looks like last year but not like 2024 (for example after a one-off capital gain two years ago).

Current-year: estimate 2026 net tax (plus CPP/EI) and pay one-quarter each quarter. Best when income dropped — but underestimating can create instalment interest. Revisit the estimate before each remaining due date.

You may choose the option that produces the lowest correct payment. Switching mid-year is allowed in practice as long as the amounts you pay satisfy CRA’s interest rules for the method you rely on.

For a normal four-quarter year, CRA typically sets March 15 and June 15 at 25% of your 2024 net tax owing each. September 15 and December 15 then share whatever remains so the four payments total your 2025 net tax owing.

Example: 2024 net tax $9,000 and 2025 net tax $12,000 → March and June $2,250 each; September and December $3,750 each (four payments total $12,000).

Always prefer the dollars printed on your INNS1 reminder over a reconstruction. Enter reminder amounts in the planner when you have them.

Sometimes CRA only lists September and December on the August reminder — for example if you were not expected to pay March/June. The calculation chart then says: for prior-year or current-year options, pay 75% of the instalment base on September 15 and 25% on December 15.

For the no-calculation option in that situation, pay the amount in box 2 of the reminder for each of those two dates. You can also stop or reduce payments if instalments already paid cover your estimate, or if this year’s net tax will be at or under the threshold.

If farming or fishing is your chief source of income, you generally make one instalment by December 31 — not the four quarterly dates. Income Tax Act s.155 requires two-thirds of either your estimated tax for the year or your prior-year instalment base.

CRA’s calculation chart multiplies the instalment base by 66% (a rounded 2/3). You usually receive a November reminder. The same threshold rules still apply: if net tax stays at or under the limit, you may not need to pay.

If required instalments are late or too low, CRA can charge instalment interest at the prescribed rate (published quarterly). Interest is calculated as if you were required to pay the least of the three option amounts — so choosing a valid lower option can reduce exposure.

A separate instalment penalty can apply when instalment interest exceeds $1,000. Paying the no-calculation reminder amounts in full and on time is the usual way to avoid instalment interest even if your eventual tax is higher.

This planner does not compute interest or penalty dollars. Use it for cash-flow planning, then confirm balances in CRA My Account.

CRA encourages increasing tax withheld at source when possible. For OAS use form ISP3520OAS; for CPP benefits use ISP3520CPP; for employer or pension income use Form TD1 (Personal Tax Credits Return) asking for additional tax deducted.

Income that cannot have tax withheld — self-employment, many investments, rental income, capital gains — is exactly why instalments exist. Budgeting quarterly payments (or a December farmer payment) replaces withholding.

If you expect a much lower balance this year, document your current-year estimate. That supports using the current-year option or skipping payments when you fall under the threshold.

Common methods: CRA My Payment, pre-authorized debit from My Account, online banking (payee “Canada Revenue Agency” / tax instalments), or at a Canadian financial institution. Keep confirmation numbers and match payments to the correct tax year.

Paying early is fine; paying late can start interest even if you catch up before filing. If a due date falls on a weekend or a CRA-recognized holiday, the next business day counts as on time.

Corporate instalments and GST/HST remittance instalments use different rules and calendars — do not mix them with this personal T1 planner.

Sole proprietors often face instalments because T2125 business income has no employer withholding. Estimate federal and provincial tax plus double CPP/QPP with our self-employed calculator, then feed net tax and CPP into this planner.

Remember the filing calendar: many self-employed people can file by June 15, but any balance owing is still due April 30 — instalments during the year reduce that April shock.

GST/HST registration and remittances are separate from income-tax instalments. Crossing the small-supplier threshold does not by itself create T1 instalments, but higher profit often does.