Thailand Home Decision (Down payment model)

Inputs

General

Horizon (years):

Discount rate / alt return (%/yr):

Down payment (THB):

Notes

Loan is computed as max(0, purchase price − down payment). If down payment is small, monthly payment rises, but you keep more cash available for investing.

Option 3: Rent a house

Rent (THB/month):

Rent growth (%/yr):

Option 1: Buy new house now

House price (THB):

Mortgage rate (%/yr):

Mortgage term (years):

Transaction costs (% of price):

Appreciation (%/yr):

Maintenance (% of value/yr):

Selling friction (% of sale):

Option 2: Buy old + renovate now

Purchase price (THB):

Renovation budget (THB):

Mortgage rate (%/yr):

Mortgage term (years):

Transaction costs (% of purchase only):

Appreciation (%/yr):

Maintenance (% of value/yr):

Selling friction (% of sale):

Fees apply to purchase price only. Starting value is purchase + renovation.

Option 4: Rent a condo first, then buy the new house

Condo years (before buying):

Condo rent (THB/month, max 25k):

Condo rent growth (%/yr):

Commute/location benefit (THB/month):

One-time move cost condo→house (THB):

The house you buy in Option 4 uses the same parameters as “Buy new house now”. Purchase price is assumed to grow by the house appreciation rate during the condo years.

Model: Monthly cashflows discounted at your chosen discount rate. Buying includes mortgage + maintenance and ends with a sale at the horizon. Renting is just cash outflow. Condo-first includes a purchase event during the horizon.

Results

NPV cost (bar chart)

Lower is better. Don’t get emotionally attached to a bar chart.

Equity by year (hover for tooltips)

Equity = (home value after selling friction) − (remaining loan). Rent has zero equity.

Summary table

Option	Upfront cash (year 0)	Cash needed at buy year	Initial loan	Starting net monthly	Terminal cashflow	NPV cost

Initial loan is computed from the down payment. Condo-first “buy year” occurs at the end of the condo period.