How the Buy vs Rent Calculator Works
This calculator compares the long-term financial outcome of buying a home versus renting an equivalent property and investing the difference. It tracks net worth for both the buyer and the renter year by year, accounting for every significant cost and benefit on both sides.
The key insight is that renting is not simply "throwing money away." A renter who invests their deposit and the monthly difference between rent and ownership costs can build significant wealth. The question is whether the buyer's home equity and price appreciation outpaces the renter's investment portfolio over your chosen time horizon.
What the Calculator Tracks for the Buyer
Buyer Net Worth = Home Value − Remaining Mortgage Balance
Annual costs: mortgage payments + maintenance + property tax + insurance + HOA
Transfer tax and buying costs are one-off upfront costs
Home value grows at the appreciation rate each year
Mortgage interest deductibility (hypotheekrenteaftrek in NL) is not included in the base calculation as it varies significantly by income and situation. Consult a tax adviser for your specific position.
What the Calculator Tracks for the Renter
Renter Net Worth = Investment Portfolio Value
Starting investment = down payment + transfer tax + buying costs (all invested instead)
Monthly investment = difference between true ownership cost and rent
If rent > ownership cost, the buyer has the higher monthly outgoing
The renter's investment return is assumed to be consistent. In reality, returns vary. The 7% default reflects long-run real returns from a globally diversified index fund.
The Price-to-Rent Ratio
The price-to-rent ratio is calculated by dividing the purchase price by annual rent. It is a quick heuristic for whether buying or renting is likely to win:
Below 15 — buying is usually the clear financial choice. Between 15 and 20 — the decision depends heavily on how long you plan to stay and local market conditions. Above 20 — renting and investing the difference becomes increasingly competitive. In Amsterdam, the ratio has exceeded 30 in recent years, which is why many financial analysts argue renting is not always the inferior choice in the Dutch market.
Frequently Asked Questions
Does the calculator include mortgage interest tax deductibility?+
No — mortgage interest deductibility (hypotheekrenteaftrek in the Netherlands, mortgage interest relief in the UK until 2020) is not included in the base calculation because it varies significantly based on your personal income tax rate, the phase-out rules, and your specific mortgage structure. In the Netherlands, the deduction is limited to the box 1 rate (37,48% in 2025) and is being gradually reduced. Adding your expected deduction as a negative cost in the "other buying costs" field is possible but consult a tax adviser for your specific situation.
Why does the renter's invested deposit matter so much?+
The renter's invested deposit is often the decisive variable in the comparison. A buyer puts their deposit into illiquid home equity. A renter who invests that same amount in a globally diversified index fund at 7% per year can generate substantial returns over 20–30 years. Many rent vs buy analyses ignore this, making buying look like the obvious choice. This calculator properly accounts for the opportunity cost of the deposit — the most honest way to compare the two paths.
How long do I need to stay for buying to make sense?+
The break-even point — when the buyer's net worth first exceeds the renter's — depends heavily on transfer tax, appreciation rate, and the price-to-rent ratio. In markets with high transfer tax (Netherlands at 10,4% for non-first-time buyers) and high price-to-rent ratios, the break-even can take 10–15 years. In markets with low transfer tax and strong appreciation, the break-even can be 3–5 years. As a general rule, if you plan to stay fewer than 5 years, renting is often the better financial choice.
What is the price-to-rent ratio and what does it mean?+
The price-to-rent ratio is the purchase price divided by the annual rent for a comparable property. A ratio of 15 means the purchase price is 15 times the annual rent — roughly the point where buying and renting are financially equivalent over the long run. Below 15, buying tends to win. Above 20, renting and investing becomes increasingly competitive. In many major European cities including Amsterdam, London, and Paris, ratios have exceeded 25–35, which is why renting is not always the financially inferior choice in those markets.
Should I include my home in my net worth calculation?+
Your primary residence is an asset but a special one — it is illiquid, expensive to sell (transfer tax, agent fees), and generates no income unless you rent it out. Some financial planners exclude it from investable net worth precisely because you cannot easily convert it to cash without also needing somewhere else to live. This calculator includes home equity in buyer net worth because over a long horizon the equity is real and accessible, but it is worth understanding that home equity is fundamentally different from a liquid investment portfolio.