Rent vs Buy: The 5% Rule and When It Breaks

The internet is full of rent-vs-buy debates. The math comes down to a single number — and a handful of caveats.

This used to be a back-of-the-envelope job. Now it is one tap, but the logic has not changed. The internet is full of rent-vs-buy debates. The math comes down to a single number — and a handful of caveats.

The 5% rule

Total annual cost of owning ≈ home price × 5% (property tax + maintenance + cost of capital). If rent is below 5% of price, renting wins.

Caveats that flip it

Long stay (>7 years), high rent inflation, equity buildup via principal payments, tax deductions.

The transaction-cost trap

Buying and selling within 3 years usually loses money after closing costs and realtor fees.

Pro tips

  • Renting is not 'throwing money away' — it is buying flexibility and someone else absorbing maintenance.
  • Run the calculation every 2 years; markets and your life both change.

Frequently asked questions

Does buying always beat renting eventually? No — opportunity cost of down-payment invested in the market often beats home appreciation.

What if I want stability? That has real value. Just don't pretend it's a pure financial decision.

If you only remember one thing from this post, make it that the inputs matter more than the calculator.

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