The Real Cost of Vacancy Rates

Many new landlords make the mistake of applying a universal 5% vacancy rate to their rental property calculations, regardless of property type.

While it may seem like a harmless shortcut, this oversight can actually lead to major financial surprises down the road.

A property’s vacancy rate—or as we call it, the Rent Loss Rate—reflects more than just empty units. It also accounts for turnover time, tenant defaults, repairs, and eviction delays.

And these factors vary widely depending on the property’s class.

If you’re not factoring these risks properly, your cash flow model could be deceiving you.

Below, we break down how to calculate vacancy rates by property class so you can accurately analyze deals and avoid surprise costs.

What Is the Vacancy Rate?

Your vacancy rate calculates the percentage of time a property isn’t generating rental income. This includes situations like:

• - Vacant periods between tenants.
• - Repairs needed to make the property rent-ready.
• - Unpaid rent from non-performing tenants.
• - Legal costs and delays tied to evictions.

A more comprehensive term would be Rent Loss Rate because these issues directly bite into your bottom line.

Physical vs. Economic Vacancy Rates

• - Physical Vacancy: Measures the time your property remains unoccupied.
• - Economic Vacancy: Accounts for both physical vacancy and income loss due to below-market rents or waived fees.

Both metrics are important to understand when evaluating the profitability of a rental property.

Calculating Vacancy Rate

To calculate a property’s vacancy rate accurately, here’s the formula to use:

Vacancy Rate = Days Vacant ÷ Rentable Days

For example:
A property vacant for 15 days in one year has a:
15 ÷ 365 = 4.1% vacancy rate.

When managing multiple units, sum up the total days vacant and divide by the total rentable days across all units.

Vacancy Rates by Property Class

Vacancy rates differ significantly depending on the type of property. Applying a single figure across the board won’t cut it.

Here are smarter benchmarks for different property classes:

Class A Properties – 5% Vacancy Rate

Class A properties are high-end rentals with minimal tenant turnover and shorter vacancy periods. Tenants are usually financially stable, and repairs prior to leasing are minimal.

Class B Properties – 10% Vacancy Rate

Class B properties are older but still in desirable areas. These attract middle-income tenants, leading to moderately higher turnover rates and occasional non-performance issues.

Class C Properties – 20% Vacancy Rate

Class C properties are in working-class neighborhoods and tend to see frequent tenant turnover and more substantial rent-ready repairs. Missed rent payments and evictions are more common here, significantly increasing lost income.

Class D Properties – 30-40% Vacancy Rate (Depending on Submarket)

Think economically stressed neighborhoods with high tenant turnover and frequent defaults. The risks are amplified in these properties, with extended vacancy periods and heavy maintenance costs between tenants.

Why Accurate Vacancy Rates Matter

Underestimating vacancy rates can lead to:

• - Skewed Cash Flow Models: Using 5% for a Class C property could make a deal appear profitable until you start losing money.
• - Unexpected Expenses: Turnovers, evictions, and wear-and-tear repairs add up in lower-class properties.
• - Inflated Purchase Prices: Setting the wrong assumptions inflates what you’re willing to pay, risking poor long-term performance.

For example, if you miscalculate vacancy for a Class C property, assuming 5% instead of 20%, you could unexpectedly be missing out on thousands annually, completely gutting your (inaccurate) projected profits.

Tips to Reduce Vacancy Rates

While some vacancy is inevitable, strategic property management can help minimize it:

1. - Plan Ahead for Turnovers: Market your property a few months before the lease ends to reduce downtime.
2. - Screen Tenants Thoroughly: Ensuring stable, reliable renters avoids costly turnover or eviction issues.
3. - Maintain Your Units: Keeping properties clean and up-to-date attracts quality tenants quickly.
4. Set Competitive Rents: Overpricing leads to extended vacancies, while fair-market rents attract tenants faster.

Final Thoughts

Vacancy rate shouldn’t be just a footnote in your property analysis—it’s a key indicator of what you can really expect from your rental income. Ignoring or underestimating it could leave you financially strapped, especially with riskier properties.

Whether you’re analyzing a Class A or Class D property, ensure your numbers paint an accurate picture. It’s better to spot a bad deal upfront than to deal with its consequences later.

Looking to invest in Metro Detroit? today for expert guidance and personalized strategies to maximize your rental investments.