How Deepa's Rental Property Calculator Saved Her From a $350/Month Cash-Flow Trap

The Deal That Looked Great on Paper

Deepa had been saving for two years to buy an investment property. At 34, with $130,000 in savings, she was ready. She'd found what seemed like the perfect deal: a one-bedroom condo in Toronto's east end, listed at $549,000. The current tenant was paying $2,200/month. With a 20% down payment ($110,000) and current mortgage rates, it seemed like it would "basically pay for itself."

Before signing anything, her brother suggested she run the numbers through TrackMoola's Rental Property Calculator.

What the Calculator Revealed

Deepa entered the details: $2,200 monthly rent, $549,000 purchase price, $439,200 mortgage, 5.5% rate over 25 years. Monthly mortgage payment: $2,736. She added property tax ($5,100/year = $425/month), insurance ($150/month), maintenance ($200/month), and a standard 5% vacancy allowance.

The result: monthly cash flow of negative $361.

She would be paying $361 out of pocket every single month — before accounting for any unexpected repair, special assessment, or extended vacancy.

The cap rate was 2.8% — well below the 4% threshold that real estate investors typically use as a minimum for investment properties.

Understanding the Numbers

The calculator broke down exactly why:

• Gross monthly rent: $2,200
• Vacancy allowance (5%): −$110
• Effective monthly income: $2,090
• Operating expenses (tax + insurance + maintenance): −$775
• Net Operating Income: $1,315
• Mortgage payment: −$2,736
• Monthly cash flow: −$421 (the calculator also flagged the discrepancy with the cap rate)

Cash-on-cash return: −3.7%. For every $110,000 she put down, she'd lose $3,700 per year in cash — not counting appreciation.

The Appreciation Trap

"My real estate agent kept saying the property would appreciate 3-5% a year," Deepa says. "But I was going to be negative $360 a month for years hoping for appreciation that might not come. That's speculation, not investing."

The calculator's warnings section flagged exactly this: "Negative cash flow properties rely on appreciation to generate returns. This increases risk significantly."

Finding a Better Deal

Armed with the calculator, Deepa started running numbers on other properties. She expanded her search to Hamilton and found a semi-detached house listed at $479,000, with a main unit renting for $1,850/month and a basement unit renting for $950/month — total rent $2,800/month.

Running those numbers:

• Monthly cash flow: +$187
• Cap rate: 4.8%
• Cash-on-cash return: +1.9%

Not spectacular, but positive — and the basement suite provided redundancy against vacancy.

She Bought the Hamilton Property

Deepa purchased the Hamilton property in October. Eight months in, both units are occupied, cash flow is running at +$210/month (slightly better than projected), and she's building equity on a property that's now worth approximately $490,000.

"The calculator didn't tell me not to invest in real estate," she says. "It told me not to invest in that specific property. There's a big difference."

Try It With Your Property

Use the Rental Property Calculator to analyze any property in 5 minutes. Read the step-by-step guide to understand every metric.

Also check the Rent vs Buy Calculator if you're deciding between buying a primary residence or an investment property.