Effective Vacancy Rate
+R6 Months of Reserves
Two-Input Ratio Expense Metrics Risk Assessment Operating Expenses

One Month of Reserves

Monthly amount needed for one month of operating expenses, debt service, and PMI.

Example Result

Sample Data
$3,061

Based on a sample $385,000 property with $2,850/month rent, 20% down, 7% interest rate.

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One Month of Reserves Formula

(Total Operating Expenses + Annual Debt Service + Annual PMI) / 12
($12,146 + $24,590 + $0) / 12
$3,061

What This Means

A sample property priced at $385,000 with $2,850/month rent has a one month of reserves of $3,061. Lenders often require 6-12 months of reserves when qualifying you for an investment property loan. This calculation tells you exactly what one month costs so you can plan your reserve fund. Having adequate reserves prevents forced sales during vacancies or unexpected repairs.

Where This Value Comes From

One Month of Reserves is not entered directly — it is calculated from Total Annual Expenses, Annual Debt Service, and Monthly PMI. See the formula breakdown above and the detailed inputs below.

Calculated From

One Month of Reserves is calculated using these inputs:

Total Annual Expenses
All annual costs including operating expenses and debt service.
$36,736
Annual Debt Service
Total annual mortgage payments.
$24,590
Monthly PMI
Monthly Private Mortgage Insurance payment required when down payment is below 20%.
$0

Used to Calculate

One Month of Reserves is used as an input for these calculations:

6-Month Reserves
Expense Metrics
$18,368
+R6 Return in Dollars
Expense Metrics
$184
+R12 Return in Dollars
Expense Metrics
$2,939

Platform Distribution

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Why It Matters

Lenders often require 6-12 months of reserves when qualifying you for an investment property loan. This calculation tells you exactly what one month costs so you can plan your reserve fund. Having adequate reserves prevents forced sales during vacancies or unexpected repairs.

Detailed Explanation

One Month of Reserves calculates the total monthly obligation for your property: operating expenses, mortgage payment, and PMI combined, divided by 12 to get the monthly figure. This is the base unit for calculating how much cash you need in reserve.

Example

Sample Result
$2,820

Based on a sample $385,000 property with $2,850/month rent, 20% down, 7% interest rate.

Related Calculations

Operating Expense Ratio

2

Operating expenses as a percentage of effective gross income.

37.38% Example

Total Monthly Expenses

U

All monthly costs including operating expenses and mortgage payment.

$3,061 Example

Total Annual Expenses

U

All annual costs including operating expenses and debt service.

$36,736 Example

Per Unit Operating Cost

2

Annual operating expenses divided by number of units.

$12,146 Example

Operating Cost Per Square Foot

2

Annual operating expenses divided by total square footage.

$8.10 Example

Total Expense Per Unit Per Year

U

Total annual expenses (including debt service) per unit.

$36,736 Example

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