🇨🇦 KI DataLab · 2025

KI-Tax

Self-Employed Tax Estimator - User Manual
A plain-English guide to using the tool, understanding your results, and avoiding surprises at tax time.

📋 Contents

What is KI-Tax and who is it for?
The sidebar - your main controls
Tracking your business expenses
Understanding your tax summary
The visual charts
The detailed breakdown table
Quarterly instalments warning
Saving and loading your expenses
Frequently asked questions
Important limitations

1What is KI-Tax and who is it for?

KI-Tax is a free, Canadian tax estimator built specifically for self-employed people - freelancers, contractors, consultants, and small business owners. It helps you answer one practical question throughout the year:

"How much of my income will I actually keep after taxes and CPP/QPP?"

It covers all 13 Canadian provinces and territories, uses 2025 tax rates, and accounts for the things that make self-employment taxes different from a regular salary:

You pay both the employee and employer share of CPP (or QPP in Quebec)
Your business expenses reduce the income you're taxed on
You may need to pay taxes in quarterly instalments during the year
You may need to collect and remit GST/HST/QST from your clients

⚠️ Important: KI-Tax gives you an estimate, not an exact tax bill. It does not replace a Chartered Professional Accountant (CPA). Always consult a tax professional for your final return.

2The sidebar - your main controls

The sidebar runs down the left side of the screen. Everything you enter here updates your tax estimate instantly, no need to click a "Calculate" button.

👤 Province / Territory

Select the province or territory where you lived on December 31 of the tax year. This matters because each province has its own tax rates and credits. If you moved during the year, use where you ended up at year-end.

💡 Quebec users: When you select QC, a blue notice appears confirming that QPP (Quebec Pension Plan) applies instead of CPP. QPP rates are slightly different from CPP, this is handled automatically.

💵 Total Gross Income (YTD)

Enter your total revenue before any expenses - the full amount your clients paid you. "YTD" means Year-to-Date, so you can update this number as you earn more throughout the year to get a running estimate.

💡 Example: If you invoiced $10,000 in January, $8,000 in February, and $12,000 in March, you would enter $30,000 here for a March estimate.

🏦 Sales Tax (GST/HST/QST)

Check the box "Registered for GST/HST/QST?" if you are registered to collect sales tax from your clients. Once checked, the app will show you how much sales tax you are collecting based on your gross income and province.

⚠️ Registration may be mandatory: If your annual revenue exceeds $30,000, you are legally required to register for GST/HST. The app will show you a warning if you are over this threshold and haven't checked the box.

Sales tax rates by province used in the app:

Province / Territory	Tax Type	Rate
Ontario (ON)	HST	13%
New Brunswick, Newfoundland, PEI (NB/NL/PE)	HST	15%
Nova Scotia (NS)	HST	14% (reduced Apr 2025)
Quebec (QC)	GST + QST	14.975%
Alberta, territories (AB/NT/NU/YT)	GST only	5%
BC, Saskatchewan, Manitoba (BC/SK/MB)	GST only	5%

📌 Note: The sales tax estimate shows how much you're collecting from clients on behalf of the government, it is not your money and is not included in your income tax calculation. You must remit it to the CRA (or Revenu Québec).

3Tracking your business expenses

Business expenses reduce the income you're taxed on. The more legitimate expenses you track, the lower your tax bill. The app uses the same expense categories as the CRA's T2125 form (the form self-employed people file).

Adding an expense

Date: Type the date in YYYY-MM-DD format, for example 2025-06-15. This is for your own records - the calculation does not depend on the date.

Category: Choose the category that best matches your expense from the dropdown. These match CRA's T2125 line items, so they'll be useful when you file.

Amount: Enter the full dollar amount of the expense.

Description: Add a short note to remind yourself what the expense was for (e.g. "Adobe subscription" or "Toronto client meeting lunch").

Click ➕ Add Expense. The expense appears in the table and your tax estimate updates automatically.

The 50% rule for Meals & Entertainment

If you choose the "Meals & Entertainment" category, the app automatically applies the CRA's 50% rule, only half the amount is counted as deductible. This is the correct treatment per CRA rules. You'll see both the full amount and the deductible amount in the expense table.

💡 Example: You enter a $200 client dinner. The app records $200 as the gross amount but only $100 as deductible, reducing your taxable income by $100, not $200.

Expense categories explained

Category	What it covers
Advertising	Online ads, print ads, website promotion
Meals & Entertainment	Client dinners, business lunches (50% deductible)
Insurance	Business/professional liability insurance
Interest & Bank Charges	Business account fees, loan interest
Business Taxes, Licences & Dues	Professional membership fees, business licences
Office Expenses	Pens, paper, printer ink, small supplies
Professional Fees	Accountant, lawyer, consultant fees you paid
Rent	Office or equipment rental
Repairs & Maintenance	Minor repairs to business equipment
Salaries, Wages & Benefits	What you pay any staff you've hired
Property Taxes	Business property taxes only
Travel Expenses	Flights, hotels, taxis for business travel
Utilities	Electricity, internet, phone (business portion)
Fuel Costs	Fuel for non-vehicle business use
Delivery, Freight & Express	Shipping costs, courier fees
Motor Vehicle Expenses	Car costs - log your business vs. personal km separately
Business-Use-of-Home	Home office costs - proportion of rent/mortgage, utilities
Other Expenses	Anything else that is a legitimate business cost

⚠️ Keep your receipts: The CRA can audit your expenses. Always keep receipts and documentation for everything you claim, even if you're just using this app for estimates.

4Understanding your tax summary

Once you've entered your income, the Tax Summary section appears with 8 metric cards. Here's exactly what each one means:

Net Business Income

$68,000

Gross − Expenses

Taxable Income

$63,270

After CPP deduction

Total Tax Bill

$18,450

Tax + CPP/QPP

Take-Home Pay

$49,550

After all deductions

Card	What it means
Net Business Income	Your gross income minus all your deductible expenses. This is what the CRA considers your business income before calculating tax.
Taxable Income	Net income after subtracting the deductible portion of your CPP/QPP contributions. This is the actual number your income tax is calculated on.
Total Tax Bill	The total you need to set aside: income tax (federal + provincial) plus your full CPP/QPP contribution. This is your real cost.
Take-Home Pay	What's left after everything, your net income minus the total tax bill. This is the money actually available to you.
Federal Tax	The income tax you owe to the federal government (CRA), after applying the Basic Personal Amount credit and the CPP contribution credit.
Provincial / Quebec Tax	The income tax you owe to your province. For Ontario residents, this includes the Ontario Health Premium (up to $900/year).
CPP / QPP Contribution	Your total Canada Pension Plan (or Quebec Pension Plan) contribution. As self-employed, you pay both the employee and employer portions, roughly double what an employee pays.
Marginal Rate	The combined federal + provincial tax rate on your next dollar of income. The smaller number below it is your average (effective) rate, what percentage of your total income went to tax overall.

📌 Marginal vs Average rate: Your marginal rate (e.g. 43.41%) applies only to the last dollars you earned. Your average rate (e.g. 28%) is your actual overall tax burden. The average rate is the more useful number for planning.

5The visual charts

Below the summary cards you'll find two chart tabs.

📊 Income Distribution (Donut Chart)

Shows how your net income is split between the four main buckets: Federal Tax, Provincial Tax, CPP/QPP, and Take-Home Pay. The dollar amount and percentage of each is shown below the chart. Hover over any slice to see the exact dollar amount.

Use this chart to quickly answer: "What percentage of my income am I actually keeping?"

🌊 Money Flow (Sankey Diagram)

This diagram traces every dollar from your gross income through to take-home pay. Thick bands mean more money flowing through that path. You can see:

How much goes to business expenses (reducing your taxable base)
How much goes directly to CPP/QPP off the top
How taxable income then splits between federal tax, provincial tax, and take-home

💡 Tip: Hover over any band in the Sankey diagram to see the exact dollar amount flowing through that path.

6The detailed breakdown table

Below the charts is a line-by-line breakdown showing exactly how your tax bill was calculated, from gross income to take-home pay. This follows the same logic as your CRA T1 return.

Line Item	What it is
Gross Income	What you entered in the sidebar - your total revenue.
Business Expenses	Total of all deductible expenses you tracked.
Net Business Income	Gross minus expenses - your starting point for tax.
CPP/QPP Contribution	Your full pension contribution (both halves).
CPP/QPP Deduction	The portion of your CPP/QPP that reduces taxable income. This is the employer-equivalent half of the base contribution, plus 100% of the enhanced (CPP2/QPP2) portion.
Taxable Income	Net income minus the CPP/QPP deduction. Income tax is calculated on this number.
Federal Income Tax	Federal tax after Basic Personal Amount credit and CPP base tax credit.
Provincial Income Tax	Provincial tax after Basic Personal Amount credit and CPP base tax credit. For Ontario, includes the Health Premium.
Total Income Tax	Federal + provincial combined.
Total Tax Bill	Income tax + full CPP/QPP contribution - the total you owe.
Take-Home Pay	Net income minus total tax bill.

📌 Why does the CPP/QPP deduction not equal the full contribution? Because CRA splits CPP/QPP into two tax benefits: the employer-equivalent half of the base is a deduction (reduces taxable income), and the employee-equivalent half of the base becomes a non-refundable tax credit (directly reduces your tax bill). The enhanced portions — CPP2 and QPP2 — are 100% deductible. The app handles all of this automatically.

7Quarterly instalments warning

Unlike employees who have tax withheld from every paycheque, self-employed people pay tax in a lump sum at filing, unless the CRA requires quarterly instalments.

The app checks your estimated income tax against the CRA threshold and shows you one of two messages:

🚨 Instalments Required

If your estimated income tax exceeds $3,000 (or $1,800 in Quebec), the CRA requires you to pay in quarterly instalments. Missing these can result in interest charges. The app shows you the suggested amount per quarter and the four due dates:

Mar 15 Jun 15 Sep 15 Dec 15

📅 Below Threshold

If you're below the threshold, instalments aren't required yet - but the app still shows you a suggested quarterly set-aside amount. Setting money aside regularly is good practice to avoid a large surprise bill in April.

💡 Pro tip: As soon as your annual income estimate exceeds about $25,000, start setting aside roughly 25–30% of every invoice payment in a separate savings account. Use KI-Tax to refine that percentage as your income grows.

8Saving and loading your expenses

Your expenses are stored temporarily in your browser session - if you close the tab, they will be lost. To keep them, use the export and import features.

⬇️ Exporting your expenses

After adding expenses, scroll to the bottom of the sidebar.

Click ⬇️ Export Expenses (CSV). A file called expenses_export.csv will download to your computer.

Save this file somewhere you'll find it, your Downloads folder, Google Drive, or Dropbox.

📂 Importing expenses next time

Open the app and find Import Expenses (CSV) in the sidebar.

Click Browse files and select your previously exported CSV file.

Your expenses will reload and your tax estimate will update automatically.

🗑️ Clearing all expenses

Click 🗑️ Clear All Expenses to remove all entries and start fresh. You will be asked to confirm. Make sure you've exported first if you want to keep a record.

⚠️ Always export before closing: The app does not save automatically. If you close or refresh the browser tab without exporting, all your expenses will be lost.

9Frequently asked questions

Why is my tax bill so much higher than an employee earning the same income?

Because you pay both the employee and employer halves of CPP. An employee only sees 5.95% deducted from their pay, their employer quietly pays another 5.95% on top. As self-employed, you pay the full 11.9% yourself. This is why the CPP line looks large.

Why is the "CPP/QPP Deduction" different from my total CPP contribution?

CRA splits the benefit: the employer-equivalent half (and all of the CPP2/QPP2 enhanced tier) is a deduction from income, while the employee-equivalent half of the base becomes a non-refundable tax credit that directly reduces your tax bill. The app applies both correctly, the deduction reduces taxable income, and the credit reduces the tax calculated on that income.

I live in Quebec. Why is my federal tax lower than my friend's in Ontario at the same income?

Quebec residents receive a 16.5% federal tax abatement - a reduction in federal tax, because in the 1960s Quebec opted out of certain federal-provincial programs (such as hospital care and social welfare) and chose to fund and administer them directly. The federal government reduced its income tax in Quebec by an equivalent amount to compensate. In exchange, Quebec runs its own full provincial tax system and residents file two separate returns. Quebec residents pay higher provincial tax, but the federal reduction largely offsets this so the total combined burden is roughly comparable to other provinces.

What is the Ontario Health Premium?

It is a levy paid by Ontario residents with taxable income above $20,000, ranging from $0 to a maximum of $900 per year. It is included in the Provincial Tax figure in the app and is labelled "Provincial Tax (incl. Health Premium)" in the summary cards.

Does this tool include EI (Employment Insurance)?

No. EI for self-employed people is voluntary, you must opt in and pay premiums for at least 12 months before you can claim. It covers special benefits like maternity/parental leave, sickness, compassionate care, and family caregiver benefits - not regular unemployment. Since it's optional and most self-employed people do not opt in, the app does not include it. If you are opted in, your actual tax bill will be slightly higher. Quebec note: Self-employed Quebec residents are already covered for maternity and parental benefits through the mandatory QPIP (Quebec Parental Insurance Plan). If a Quebec resident opts into federal EI, they can only access sickness, compassionate care, and family caregiver benefits through it, not maternity or parental.

Can I use this for my incorporated business?

No. KI-Tax is designed for unincorporated self-employed individuals who file a T1 personal return with a T2125 business income schedule. Incorporated businesses file a T2 corporate return, which has very different rules. Speak to an accountant if you are incorporated.

My income changes month to month. How should I use this tool?

Update your Gross Income figure in the sidebar as you earn more throughout the year. The estimate will automatically recalculate. A good habit is to update it at the end of each month and check whether you should be making quarterly instalment payments.

What does "marginal rate" mean and why does it matter?

Your marginal rate is the combined federal + provincial tax rate on your next dollar of income. It matters for decisions like: "If I take on one more client and earn an extra $5,000, how much will I keep?" Multiply that $5,000 by your marginal rate to see the tax cost of that decision.

10Important limitations

KI-Tax is a planning tool, not a tax filing tool. There are things it does not calculate:

Not included	Why it matters
RRSP deductions	Contributing to an RRSP reduces your taxable income significantly. If you make RRSP contributions, your actual tax bill will be lower than the estimate.
Capital gains	If you sold investments or assets, those gains are taxed separately.
Other income sources	Rental income, investment income, employment income from a second job, and government benefits are not included.
Quebec QPIP	Quebec residents also pay into the Quebec Parental Insurance Plan. This is a small additional deduction not modelled here.
Disability, medical, or caregiver credits	Various non-refundable credits may reduce your actual tax bill further.
Prior year tax owing	If you owed tax last year, CRA may already be requesting instalments based on that, check your CRA My Account.
Corporate tax	This tool is for personal/sole-proprietor filing only, not incorporated businesses.

⚠️ Always consult a CPA for your actual tax return, especially if your situation involves any of the above. This tool is best used for in-year planning and cash-flow forecasting, not for filing.

Authoritative sources you can always verify against:

CRA: canada.ca/en/revenue-agency
Revenu Québec: revenuquebec.ca
Tax rates reference: taxtips.ca