How to Report Multiple T4 Slips on Line 10100?

If you worked more than one job in a year, you likely received more than one T4 slip. The good news is that reporting multiple T4 slips on Line 10100 is straightforward once you know the process. You simply add up the employment income from all your T4 slips and enter the total on Line 10100 of your tax return. Missing this step or entering figures incorrectly is one of the most common 10100 mistakes Canadians make. This guide walks you through everything you need to know clearly and simply. 

What Is Line 10100 on Your Tax Return?

Line 10100 on your tax return is where you report your total employment income for the year. It used to be called Line 101 before the CRA updated its numbering system. This line captures the income shown in Box 14 of each T4 slip you receive from your employers.

Every employer you worked for during the tax year is required to send you a T4 slip. If you had two jobs, you get two T4s. If you had three jobs, you get three. Each slip shows what that specific employer paid you and what they deducted. Your job at tax time is to combine all of that employment income and report the correct total on Line 10100.

Step-by-Step: How to Report Multiple T4 Slips on Line 10100

This is the part most people need the most help with. Follow these steps carefully to avoid errors.

Step 1. Collect All Your T4 Slips

Before you start filing, gather every T4 slip you received for the tax year. This includes slips from full-time jobs, part-time jobs, seasonal work, and short-term contracts. Employers are required to send T4s by the last day of February each year. If you are missing one, log into your CRA My Account online to view slips that your employers have already submitted. Do not begin filing until you have all of them in hand.

Step 2. Locate Box 14 on Each T4 Slip

Once you have all your T4 slips, look at Box 14 on each one. Box 14 is labeled “Employment Income” and shows the total amount that specific employer paid you during the year. This is the only box that goes directly into Line 10100. Do not confuse it with Box 16 (CPP contributions), Box 18 (EI premiums), or Box 22 (income tax deducted). Those boxes feed into other lines on your return.

Step 3. Add Up All Box 14 Amounts

Take the Box 14 figure from every T4 slip and add them all together. For example, if you worked at two jobs in any firm in Brampton and received $38,000 from one employer and $19,500 from another, your combined employment income is $57,500. That total is what gets reported. Double-check your addition before moving forward. A small math error here is one of the most frequent 10100 mistakes that causes problems with the CRA.

Step 4. Enter the Total on Line 10100

Write or enter your combined Box 14 total on Line 10100 of your T1 General tax return. If you are filing on paper, this is found in the “Total Income” section. If you are using tax software, the program will have a dedicated T4 entry screen where you input each slip separately and the software automatically adds everything up and places the correct total on Line 10100 on your tax return.

Step 5. Enter Other Deductions From Each T4 Slip

Do not stop at Box 14. You also need to transfer other amounts from each T4 slip to the correct lines on your return. Add up Box 22 (income tax deducted) from all slips and enter the combined total on Line 43700. Add Box 16 (CPP contributions) from all slips and enter on Line 30800. Add Box 18 (EI premiums) from all slips and enter on Line 31200. Doing this correctly ensures you get credit for every dollar that was withheld from your paycheques throughout the year.

Step 6. Review for Completeness Before Filing

Before you submit your return, go back and confirm that you have accounted for every T4 slip. Compare the number of slips you entered against the number of employers you worked for. Cross-check your Line 10100 total against your own records or final pay stubs. Missing even one T4 is a common 10100 mistake that the CRA will catch because they receive copies of all T4s directly from your employers.

Filing With Tax Software vs. Filing Manually

Tax software makes this process much easier. Programs like TurboTax, Wealthsimple Tax, and StudioTax allow you to enter each T4 slip individually. The software pulls the correct amounts from each box and places them on the right lines automatically. It also flags if something looks off before you file.

If you are filing by hand, the process requires more attention. You need to manually total all Box 14 amounts before writing anything on Line 10100 on your tax return. Take your time, use a calculator, and verify each number twice.

Common 10100 Mistakes to Avoid

Many people make avoidable errors when they have more than one T4. The most common is simply forgetting to include all slips, especially from short-term or seasonal jobs. Another frequent mistake is using the wrong box number from the T4. Always confirm you are using Box 14 and not another box. Some people also forget to add up deductions from each slip separately, which means they miss credits they are owed.

If your income came from a foreign employer, remember to convert all amounts to Canadian dollars before entering anything on Line 10100 on your tax return. If your tax situation feels overwhelming or you want to make sure everything is filed correctly, Tax Return Filers Ltd. are ready to help you file with confidence and accuracy.

What If You Are Missing a T4 Slip?

Do not skip filing just because you are waiting on a T4. Log into CRA My Account to check if your employer has submitted it electronically. If it is not there and you cannot reach your employer, use your last pay stub of the year to estimate your income and deductions. Note this on your return and follow up with your employer afterward. Filing with an estimate is better than filing late and facing penalties.

Conclusion

Reporting multiple T4 slips on Line 10100 is a straightforward process when you follow the right steps. Collect all your slips, find Box 14 on each one, add the totals together, and enter the combined amount on Line 10100. Then transfer the deduction boxes to their correct lines so you do not leave any credits behind. Stay organized, double-check your numbers, and avoid the common 10100 mistakes that lead to CRA reassessments.