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23 June 2026

Creating a comprehensive cash flow model for second homes

Build a reliable cash flow model for your second home with this step-by-step guide, covering key aspects such as mortgage, capex, and short-term rental income

Creating a comprehensive cash flow model for second homes

Building a cash flow model for a second home is crucial to understand its financial performance and make informed decisions. A comprehensive model should take into account various factors, including mortgage paymentscapital expenditures (capex), seasonality and short-term rental income (STR).

Understanding the components of a cash flow model

A cash flow model typically consists of three main components: revenueexpenses and cash flow. For a second home, revenue is primarily generated through STR income, while expenses include mortgage payments, capex, property management fees, and other operating costs.

Calculating mortgage payments and capex

To calculate mortgage payments you need to consider the loan amount, interest rate, and repayment term. You can use a mortgage calculator or create a custom formula in your spreadsheet. For capex, you should budget for regular maintenance and repairs, as well as potential upgrades or renovations.

Accounting for seasonality and STR income

Seasonality can significantly impact STR income, with peak seasons typically generating more revenue than off-peak seasons. To account for this, you can use historical data or industry benchmarks to estimate average occupancy rates and revenue per available room (RevPAR). You can then use these estimates to calculate your STR income.

Creating a comprehensive cash flow model

Using a spreadsheet, you can create a comprehensive cash flow model that takes into account all the components mentioned above. Start by setting up a table with columns for revenue, expenses, and cash flow, and then use formulas to calculate each component. You can also use sensitivity analysis to test different scenarios and identify potential risks and opportunities.

Calculating breakeven occupancy

To determine the breakeven occupancy rate you need to calculate the point at which your STR income covers all your expenses, including mortgage payments, capex, and operating costs. You can use a formula such as: Breakeven Occupancy Rate = Total Expenses / (RevPAR x Average Daily Rate). This will give you a clear understanding of the minimum occupancy rate required to generate positive cash flow.

Thomas Hughes
Author

Thomas Hughes

Thomas Hughes, a property and real estate journalist, reports on the housing market, second-home purchases and mortgage trends, guiding buyers and sellers through property decisions.