Buy-to-Let vs Savings Calculator

Buy-to-Let vs savings calculator compares property investment returns to high-yield savings. 100k capital: BTL at 4% yield + 3% appreciation = 7% total return; high-yield savings at 4.5%. Over 10 years: BTL 196,715 vs savings 155,297 - BTL wins by 41k. But BTL takes work and risk; savings are passive and protected.

Example: 100k cash. Option A: high-yield savings (4.5%) - 155k after 10 years, fully liquid, FSCS protected. Option B: BTL property cash purchase (5% yield, 3% appreciation = 8% total) - 216k after 10 years, illiquid, tenant management required, taxes apply. BTL outperforms by 61k but with effort and risk - is the extra 6k/year worth managing tenants and 100k illiquidity?

BTL realities not in pure math: tax (rental income taxable, no Section 24 relief on mortgage interest for individuals), letting costs (agency fees, maintenance, void periods, insurance), tenant risks (rent arrears, damage, evictions), regulation (right to rent, EPC requirements, deposit protection). Savings simpler: enter rate, watch interest accrue. Choice depends on hands-on willingness and risk tolerance.

A worked example

Try the defaults: investment capital of 100,000, savings interest rate of 4.5%, btl rental yield of 5%, btl appreciation of 3%. The tool returns 60,595.56. You can adjust any input and the result updates as you type — no submit button, no reload. That's the real power here: seeing how sensitive the output is to one or two assumptions.

What moves the number most

The result responds to Investment Capital, Savings Interest Rate %, BTL Rental Yield %, BTL Appreciation %, and Investment Period. Two inputs usually tip the answer one way or the other. Identify which ones matter most by flipping each value past a round threshold and watching whether the option with the lower calculated total changes.

The formula behind this

Compound capital at each rate over years; difference = winner's advantage. Everything the calculator does is shown in the formula box below, so you can check the math against your own spreadsheet if you want.

Why investors run this

Most people's intuition for compounding is wrong — not because the math is hard, but because linear thinking doesn't account for curves. Running numbers through a calculator like this one is the cheapest way to recalibrate that intuition before making an irreversible decision about contribution rate, asset mix, or retirement age.

What this doesn't capture

Steady-rate math ignores real-world volatility. Actual returns are lumpy; sequence-of-returns risk matters most in drawdown; fees and taxes drag on compound growth; and behaviour changes in drawdowns can reduce outcomes below the projection. The number represents one scenario rather than a forecast.