Rent vs. Buy + Invest

No, this is one of personal finance's biggest myths. While rent is an unrecoverable expense, homeownership also carries massive unrecoverable 'dead money' costs: mortgage interest, property and council taxes, annual maintenance (1% rule), homeowners insurance, upfront acquisition taxes (UK Stamp Duty, European Notary fees, US closing fees), and exit selling commissions (2%–6%). In the first 5 to 10 years, a homeowner's cumulative sunk costs often exceed the total rent paid by a tenant.

Our simulator creates a strictly budget-neutral, apples-to-apples comparison. On Day 1, the renter invests the exact deposit and upfront transaction fees (which the buyer surrendered to lenders and governments) into a diversified stock index like the S&P 500, MSCI World, or FTSE All-World. Each month, if homeownership costs exceed rent, the renter invests the surplus into the index; if rent escalates above ownership costs, the buyer invests their surplus. Both paths liquidate after taxes at each horizon.

The 5% Rule (formulated by portfolio manager Ben Felix) states that the unrecoverable cost of owning a home is roughly 5% of its value per year: ~1% for property taxes, ~1% for maintenance and depreciation, and ~3% for the cost of capital (mortgage interest or opportunity cost of equity). If comparable annual rent is less than 5% of the property's purchase price (or monthly rent is less than price × 0.05 / 12), renting and investing the difference will mathematically outperform buying.

Upfront purchase friction creates an immediate negative equity deficit on Day 1. In the UK, SDLT can easily cost £10,000 to £40,000; in France, Germany, or Spain, notary and transfer taxes (Frais de notaire / Grunderwerbsteuer) average 7% to 10%. Because the renter immediately invests that identical cash into compounding index funds, the homeowner often requires 7 to 12 years of mortgage paydown and appreciation just to break even.

Tax shelters eliminate or dramatically reduce the tax drag on compounding market portfolios. In the UK, investing inside a £20,000/year Stocks & Shares ISA provides 0% capital gains and dividend taxes. In Australia, the 50% CGT discount cuts long-term tax in half. When market returns compound tax-free, renting and investing becomes significantly more competitive against the tax-exempt status of primary residences.

Buying strongly beats renting when: (1) You plan to remain in the property for 10 to 30 years, amortizing the upfront purchase friction over decades, (2) The mortgage is paid off, eliminating financing interest, (3) Local rent yields are exceptionally high relative to home prices, and (4) Inflation drives up rental costs while your mortgage payment remains fixed.