How to Collect and Process the TD1 Form: An Employer's Guide for 2026

The TD1 is consistently described, in onboarding checklists and HR orientation decks across the country, as something the employee needs to fill out. That description is not wrong, exactly. But it places the emphasis in the wrong place. The employee fills out the form; the employer bears the compliance obligation that follows from it. When the source deduction is wrong because the TD1 was never collected, collected once and forgotten, or applied to the wrong claim code, it is the employer who answers to CRA. The employee may owe more tax at year-end, but it is the employer who may face a payroll audit finding.

This post covers what to do with the TD1 as a workflow: when to collect it, what the claim codes mean, where the multi-employer situation creates problems most onboarding guides do not warn about, and why Quebec requires a parallel process that functions under different logic entirely. For the 2026 federal and provincial amounts themselves, those are in the TD1 federal and provincial amounts reference — this post covers what you do once you have the form in hand.

What the TD1 actually does

The TD1 is an instruction to the employer. It tells the payroll calculation how much personal tax credit to apply against the employee's earnings before computing the source deduction. An employee who claims the federal basic personal amount of $16,452 for 2026 effectively tells their employer: withhold federal income tax as though the first $16,452 of my earnings is not taxable. The employer does not send that money to the employee; they simply withhold less of each paycheque, and the employee squares with CRA annually on their T1.

If no TD1 is on file, the employer must withhold at Claim Code 0: no credits, maximum withholding. That produces a large refund for the employee at tax time and creates no technical violation for the employer, but it is a guaranteed friction point for any new hire who notices their first paycheque is lighter than expected. The practical answer is to collect the form before the first payroll runs.

The TD1's architecture descends directly from the 1971 Income Tax Act reform — the legislative implementation of the Carter Commission's recommendations, which came into force on 1 January 1972. Before that reform, the employer's withholding obligation was calibrated against a simpler personal exemption structure. The indexed personal amounts on the modern TD1 are a product of that reform. Full indexation was paused between 1986 and 2000, which is why the basic personal amount barely moved for fifteen years; it has tracked CPI annually since the 2000 federal budget restored full indexation. The amounts change every January as a result, which is why last year's TD1 amounts are wrong, even if the form structure is identical.

Two forms, not one

Every employee needs a federal TD1 and a provincial TD1. The federal form governs federal income tax withholding; the provincial form governs provincial income tax withholding. They are separate calculations that happen to sit on adjacent lines of the payroll run. CRA issues both for most provinces — the federal form and the province-specific variant — but Quebec is the exception that matters most.

The Quebec column is not a minor variation. The TP-1015.3-V is a Revenu Québec document, not a CRA document, and it asks about different things.

When to collect the TD1

Four situations require a TD1 to be collected or updated:

New hire. Collect both the federal TD1 and the applicable provincial form before the first payroll runs. The digital workflow is the cleanest approach; a paper form is fine as long as you retain the signed copy.

Mid-year life event. An employee whose personal credits change mid-year — a disability tax credit certificate granted or revoked, a spouse returning to employment (eliminating the spouse/common-law partner credit), a dependent child turning 18 — should submit a new TD1. The employer applies the updated form from the first full payroll period after receiving it. The employer is not responsible for detecting that the employee's situation has changed; the obligation to submit a new form sits with the employee.

Employee requests additional withholding. An employee who has under-withheld in prior years (common with investment income or secondary employment) can request extra withholding by completing the "additional tax to be deducted" line on the TD1. The employer applies it as instructed.

Annual indexation. This is the most commonly misunderstood trigger: a new TD1 is NOT required from existing employees simply because the indexed amounts changed on 1 January. The employer applies the new indexed amounts automatically. What changes every January is the payroll deductions table, not the employee's filed TD1.

The claim code system

CRA translates the total credits on a TD1 into a claim code for payroll purposes. The claim code tells the payroll calculation which column of the Payroll Deductions Tables (T4032) to use.

One feature of the 2023-and-later TD1 that catches employers off guard: the federal basic personal amount is no longer a single figure for all employees. The enhanced basic personal amount, introduced in the 2020 federal budget and fully phased in since, is subject to a high-income phase-out for taxpayers with net income above approximately $181,440 for 2026. The TD1 form now has two rows for the basic personal amount: one for employees whose net income is at or below the threshold, and one for those above it. Employees earning high incomes should complete the correct row; both should not be left to default.

The employer does not verify the credits an employee claims. That is CRA's function. The employer's responsibility is to enter the claim code that corresponds to what the employee declared on the signed form, and to retain that form. If an employee claims credits that turn out to be incorrect, the tax liability belongs to the employee.

The multi-employer problem

An employee working two jobs can legally claim the full basic personal amount with each employer — Claim Code 1 at Job A, Claim Code 1 at Job B. The credit is not refunded twice; it applies once against total income at the T1 filing stage. But two employers each applying Claim Code 1 means both are withholding at a reduced rate, and the employee's combined withholding will fall short of their actual tax owing.

A concrete illustration using 2026 federal rates: an employee earns $35,000 at Job A and $20,000 at Job B. Job A withholds federal tax on $35,000 after applying the $16,452 basic personal amount, so effectively on $18,548. Job B withholds on $20,000 after the same $16,452 credit, so effectively on $3,548. Combined, the employer source deductions have treated $32,904 of the employee's $55,000 income as non-taxable. The actual federal tax owing on $55,000 in employment income, with the BPA applied once, is calculated on roughly $38,548. The employee discovers the shortfall in April.

CRA's TD1 form includes a checkbox on the reverse specifically for this situation, directing employees with multiple employers to claim zero credits with their secondary employer. A responsible onboarding process at Job B — particularly for employees who disclose that they are working part-time alongside other employment — explains what that checkbox does. Employers cannot compel the employee to check it. They can ensure the employee understands the consequence of not doing so.

The Quebec TP-1015.3-V

For any employer with employees working in Quebec, the TP-1015.3-V is not a supplementary document; it is a parallel obligation. Failing to collect it means the provincial income tax calculation is running without the information it needs, which typically produces under-withholding that surfaces as a year-end Quebec tax bill for the employee.

The TP-1015.3-V differs from the federal TD1 in substantive ways. Quebec's basic personal amount is set by the provincial government, not indexed to the federal figure; for 2026 it is $18,056. The form also includes lines for QPP contribution deductions and QPIP premiums — credits that have no direct equivalent on the federal TD1, because the federal government's social contribution architecture works differently. The TP-1015.3-V is not a longer version of the CRA form; it reflects a genuinely different system.

For employers in federally regulated industries (banking, interprovincial transport, telecommunications), the TD1 process is identical to provincially regulated employers. The difference shows up in the payroll calculation itself, specifically CPP versus QPP and the EI premium differential for Quebec employees, but the form collection workflow is the same. See the CPP and CPP2 contributions guide for how those calculations interact with source deductions.

The most common compliance gap Hibiscus sees among growing companies is an Ontario employer making their first Quebec hire and collecting only the federal TD1. The discovery that a second form exists, issued by a different agency and governing a different tax, is often made in February of the following year when the employee's Relevé-1 does not balance.

Record retention

CRA requires employers to retain TD1 forms for six years from the end of the tax year to which they relate. A signed TD1 collected in January 2026 must be retained through the end of 2032. A legible digital scan satisfies the requirement; a paper form filed somewhere discoverable also works. What does not work is relying on the memory of the person who ran onboarding two years ago.

CRA payroll audits routinely request TD1 forms for all employees in the audit period and verify that the claim code on file matches the payroll entry. The most common audit finding in this area is not an incorrect claim code but a missing form altogether, typically because the onboarding process treated TD1 collection as complete once someone received the form, rather than once the signed form was stored. The same six-year retention obligation applies to most CRA payroll source documents; the Record of Employment playbook covers the parallel retention rules for ROE records.

Hibiscus and the TD1 workflow

The administrative fragility in the TD1 process is not the form itself; it is the gap between collecting a signature and storing a record that the payroll calculation can actually use. Hibiscus's digital TD1 workflow issues the form to the employee at onboarding, captures the signature, stores the record against the employee profile, and auto-applies the resulting claim code to payroll calculations. It handles both the federal form and the applicable provincial form, including the TP-1015.3-V for Quebec employees, in the same flow. If that is useful context for your setup, the details are at /tools/.

The 2026 amounts for every province, including the Quebec basic personal amount and the federal enhanced BPA thresholds, are in the TD1 amounts reference post.