ADU Tax Implications Guide for Ontario

Overview: ADU Tax Basics

When you rent out an ADU, you become a landlord with tax obligations. Understanding these rules helps you:

• Report income correctly
• Maximize legal deductions
• Avoid costly mistakes
• Plan for long-term tax implications

Reporting Rental Income

What You Must Report

All rental income, including:

• Monthly rent payments
• Parking fees
• Laundry income
• Utility reimbursements
• Late fees collected
• Key deposits kept
• Any other payments from tenant

Where to Report

Form T776: Statement of Real Estate Rentals

• Attached to your T1 personal tax return
• Due April 30 each year
• Report all income and expenses

Cash vs. Accrual Method

Most individual landlords use cash method:

• Report income when received
• Claim expenses when paid
• Simpler for small landlords

Deductible Expenses

Fully Deductible (100%)

These expenses directly relate to your rental unit:

Proportionally Deductible

Since your ADU is part of your home, you can only deduct the rental portion of shared expenses:

Calculate Your Rental Percentage:

• Square footage method: ADU sq ft ÷ Total home sq ft
• Room method: # rental rooms ÷ Total rooms

Example:

• Home total: 2,000 sq ft
• ADU: 500 sq ft
• Rental percentage: 500 ÷ 2,000 = 25%

Apply percentage to:

Capital vs. Current Expenses

Current Expenses (Fully Deductible):

• Repairs that maintain existing condition
• Minor replacements (faucet, light fixture)
• Painting
• Regular maintenance

Capital Expenses (Must Depreciate):

• Major improvements
• Additions
• New appliances
• New flooring
• New furnace/HVAC

The "Better" Test:

If it makes the property better than before (not just restored), it's likely capital.

Capital Cost Allowance (CCA)

What is CCA?

CCA (Capital Cost Allowance) lets you deduct depreciation on capital items over time.

CCA Classes for Rental Property

Should You Claim CCA on the Building?

⚠️ WARNING: Claiming CCA on the building portion can trigger "recapture" when you sell.

What This Means:

• If you claim $20,000 in CCA over the years
• When you sell, you must add back up to $20,000 as income
• This is taxed as regular income (not capital gains)

CCA on Equipment

Claiming CCA on appliances/equipment is generally safe:

Example: New Stove ($1,000)

• Class 8: 20% rate
• Year 1: $1,000 × 20% × 50% (half-year rule) = $100
• Year 2: $900 × 20% = $180
• Continue until fully depreciated

Principal Residence Exemption

The Issue

Your home is normally exempt from capital gains tax when you sell (Principal Residence Exemption - PRE).

When you convert part to rental:

• That portion may lose PRE protection
• Could owe capital gains tax on that portion when selling

The "Change of Use" Rule

Converting space to rental is a "change of use" which can trigger:

The 45(2) Election

• Defer the deemed disposition
• Maintain full PRE (with conditions)

Conditions:

• No CCA claimed on the building
• You still live in the home
• Maximum 4 years normally (can extend if required to relocate for work)

How to File:

• Include letter with your tax return in the year of change
• State you're electing under 45(2)
• Keep copy for records

Partial PRE

If you don't file the election, you may still get partial PRE:

• PRE applies to the portion you live in
• Capital gains only on rental portion
• Complex calculations - get professional help

HST Considerations

When HST Applies

Residential rent is HST-EXEMPT

• You don't charge HST on rent
• You can't claim ITCs (input tax credits) on rental expenses

Short-term rentals (<30 days) MAY be HST taxable

• If gross revenue exceeds $30,000/year
• Must register and charge HST
• Can then claim ITCs

New ADU Construction

If you hired a contractor to build your ADU:

• You likely paid HST on construction
• You generally CANNOT recover this HST
• It's part of your capital cost

Sample Tax Calculation

Scenario: Basement ADU

Rental Income:

• Monthly rent: $1,500
• Annual gross: $18,000

Expenses:

Net Rental Income:

• Gross: $18,000
• Less expenses: -$6,175
• Net taxable: $11,825

Tax Owing (estimate at 30% marginal rate):

• $11,825 × 30% = $3,547 additional tax

After-Tax Rental Income:

• $18,000 - $6,175 - $3,547 = $8,278 net

Record Keeping

What to Keep

Keep for 6 years:

• All rental receipts
• Lease agreements
• Expense receipts
• Bank statements
• Mileage logs (if applicable)
• CCA schedules
• Property documents
• Correspondence with tenants

Organizing Records

Create folders for:

Digital is acceptable - scan and organize by year and category.

Common Tax Mistakes

Mistakes That Cost Money

❌ Not reporting all rental income - CRA can audit

❌ Claiming personal expenses - Only rental portion deductible

❌ Missing deductions - Leaving money on the table

❌ Wrong rental percentage - Must be reasonable and documented

❌ Claiming CCA on building - May trigger recapture later

❌ Not filing 45(2) election - Could lose PRE

❌ Poor record keeping - Can't support claims if audited

❌ Mixing personal and rental - Use separate accounts

Mistakes That Cause Audits

• Large losses year after year
• Expenses that seem too high
• No income reported but property clearly rented
• Inconsistent reporting

When to Get Professional Help

Consider an Accountant If:

• First year renting (set up correctly)
• Complex property situation
• Significant rental income
• Planning to sell the property
• Want to optimize tax strategy
• Receive CRA inquiry or audit

Finding a Tax Professional

Look for:

• CPA designation
• Experience with rental properties
• Understanding of real estate tax issues
• Reasonable fees for your situation

Questions to Ask:

• Do you have rental property clients?
• Are you familiar with the 45(2) election?
• What records should I keep?
• How can I minimize tax legally?

Tax Planning Strategies

Legal Ways to Reduce Tax

Long-Term Planning

Think about:

• How long will you rent?
• Will you ever sell?
• Is incorporating worthwhile? (usually not for single ADU)
• Estate planning implications

Key CRA Resources

Forms

• T776: Statement of Real Estate Rentals
• T1: Individual Tax Return
• T2125: If rental is business income (rare for single ADU)

Guides

• T4036: Rental Income Guide
• IT-434: Rental of Real Property by Individual

Contact

• CRA Individual Inquiries: 1-800-959-8281
• CRA Website: canada.ca/en/revenue-agency

Quick Reference

Key Percentages

Key Deadlines

Key Elections

This guide provides general tax information for educational purposes. Tax laws are complex and change frequently. Always consult a qualified tax professional for advice specific to your situation.