How Overtime Income Affects Your Mortgage Qualification as a Nurse

If you're a nurse earning $20,000 to $40,000 per year in overtime and wondering whether a mortgage lender will actually count that income — the answer depends entirely on which lender you choose.

Some lenders ignore overtime completely. Others will average your last two years of T4 income, effectively capturing most of your overtime earnings. And a few will use your most recent T4 at full value if your employment letter confirms ongoing overtime availability.

The difference can be enormous. For an RN earning $85,000 base with $30,000 in consistent annual overtime, the gap between a lender that uses base-only ($85K qualifying income) and one that uses T4 averaging ($107.5K qualifying income) is roughly $90,000 in additional purchasing power.

Understanding How Overtime Appears on Your Documentation

Before we compare lender approaches, you need to understand what documents lenders see and how overtime shows up:

T4 Statement: Shows your total employment income for the year — base, overtime, premiums, and bonuses combined into one number. This is actually advantageous because lenders see the total, not the breakdown.

Employment Letter: This is where things get tricky. Your employer's letter will typically state your base hourly rate and FTE status. If overtime isn't mentioned, some lenders will only qualify you at the base rate regardless of what your T4 shows.

Pay Stubs: Show the real-time breakdown — base hours, OT hours, premium payments. Some lenders request 2-3 recent pay stubs to verify that overtime is ongoing.

Pro Tip: Ask Your Manager for the Right Letter

Request an employment letter that includes: "Overtime is regularly available and [your name] has consistently worked overtime hours." This single sentence can unlock thousands in additional qualification.

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Lender Approaches to Nursing Overtime

Approach 1: Full T4 Averaging (Best for Most Nurses)

How it works: The lender takes your two most recent T4s, averages them, and uses that number as your qualifying income. Since T4s include overtime, this automatically captures it.

Example:

• 2024 T4: $112,000
• 2025 T4: $118,000
• Qualifying income: $115,000

Which lenders: Most monoline lenders (MCAP, First National, CMLS, Merix) use this approach. Some Big 5 banks will as well, but it often depends on the individual underwriter.

Approach 2: Base + Percentage of Overtime

How it works: The lender confirms your base salary from your employment letter, then adds 50-80% of your average annual overtime.

Example:

• Base salary: $85,000
• Average overtime: $30,000/yr
• Qualifying income: $85,000 + ($30,000 × 75%) = $107,500

Approach 3: Most Recent T4 Only

How it works: Some lenders will simply use your most recent T4 without averaging. This is advantageous if your income has been increasing.

Example:

• 2024 T4: $105,000
• 2025 T4: $122,000
• Qualifying income: $122,000 (instead of $113,500 average)

What If You're New to Overtime?

If you've only been working overtime for less than 2 years — perhaps you just moved to a unit with more OT availability, or you switched from part-time to full-time — most A-lenders won't include it yet.

Options for nurses with less than 2 years of OT history:

1. Wait it out — once you have 2 T4s showing the higher income, qualification becomes straightforward
2. Use a B-lender — some alternative lenders require only 1 year of history, though rates are slightly higher (~0.5-1% above A-lender rates)
3. Add a co-borrower — a spouse or partner's income can bridge the gap while you build your OT history

First-time buyer? Here's everything you need to know

The Stress Test and Overtime Income

Even if a lender includes your overtime, the mortgage stress test still applies. As of 2026, you must qualify at the greater of your contract rate + 2% or the benchmark rate (currently 5.25%).

For a nurse qualifying at $115,000 income, the stress test reduces maximum purchasing power by approximately $80,000-$100,000 compared to qualifying at the actual contract rate.

Key takeaway: Maximizing your qualifying income through proper overtime inclusion is even more important because of the stress test. Every dollar of income that a lender recognizes translates to roughly $4-5 of additional mortgage capacity.