Second Home Affordability with HELOC
Calculate how using a HELOC affects monthly cash flow and how much second home you can afford.
Your Current Situation
Net positive monthly cash flow after all existing expenses.
Home equity you can access through a HELOC (Home Equity Line of Credit) to fund the second home.
Assumes HELOC usage equals the required down payment for the second home.
Annual interest rate on the HELOC. Rates are typically variable.
Length of time used to calculate monthly HELOC payments.
Second Home Assumptions
Portion of the second home price paid upfront.
Annual interest rate for the second home mortgage.
Length of the second home mortgage.
Estimated monthly rent from the second home, if applicable.
Ongoing costs such as maintenance, insurance, property tax, HOA, and vacancy reserves.
Affordability Summary
Maximum affordable second home price
$533,569
Net monthly cash flow at this price
$0/month
If the home price is lower, your estimated monthly cash flow improves:
$50k less
$483,569
$253/month
$100k less
$433,569
$506/month
$150k less
$383,569
$759/month
"Affordable" means net monthly cash flow ≥ $0.
Monthly Cash Flow Breakdown
How rental income and expenses combine to produce net monthly cash flow.
Cash Flow vs Home Price
How increasing the second home price impacts net monthly cash flow.
As home price increases, mortgage payments rise, reducing net cash flow.
About this calculator
This calculator estimates how much second home you can afford when using a HELOC (Home Equity Line of Credit) for financing.
It models how home equity usage, mortgage payments, rental income, and expenses affect your monthly cash flow and identifies the maximum home price that keeps you cash-flow positive.
What each input means
- Current monthly cash flow – Your net monthly surplus after all existing expenses.
- Available home equity – Equity you can borrow against using a HELOC.
- HELOC interest rate (APR) – Annual interest rate charged on the HELOC balance.
- HELOC repayment term – Used to estimate monthly HELOC payments.
- Down payment percentage – Portion of the second home price paid upfront.
- Second home mortgage rate – Interest rate on the second home loan.
- Mortgage term – Length of the second home mortgage.
- Expected rental income – Monthly income from renting the property.
- Non-mortgage expenses – Ongoing costs such as maintenance, taxes, insurance, HOA, and vacancy.
How this calculator works
The calculator determines the maximum second home price that keeps your net monthly cash flow at or above zero.
It combines mortgage payments, HELOC payments, rental income, and ongoing expenses, then iterates across home prices to find the affordability threshold.
Factors that affect Results
- HELOC interest rate – Higher rates increase borrowing costs.
- Rental income – Higher rent improves affordability.
- Down payment size – Larger down payments reduce mortgage payments.
- Expenses – Higher maintenance or HOA costs reduce cash flow.
- Mortgage rates – Higher rates reduce affordability.
Key assumptions & limitations
- Variable HELOC rates – Assumes a fixed rate for estimation purposes.
- Stable rental income – Does not account for rent fluctuations.
- No tax considerations – HELOC interest deductibility is not modeled.
- Estimates only – Results are illustrative and not financial advice.