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# Overpay Mortgage vs Investing Calculator
- URL: https://www.yourmoneymate.co.uk/mortgage-vs-investing-calculator/
- Published: 2026-01-19T16:00:44.000Z
- Updated: 2026-07-24T11:47:50.000Z
- Description: Compare overpaying your mortgage vs investing. See interest saved, portfolio growth, and which strategy could build more wealth over time.
- Author: Ash Davidson

## How to use this calculator

This tool is designed to be simple.

Just enter a few key details and compare both scenarios.

### 1\. Enter your mortgage details

Add:

- Your remaining mortgage balance
- Your mortgage interest rate

This helps calculate how much interest you could save by overpaying.

### 2\. Add your monthly overpayment

This is the amount you’re considering either:

- Putting towards your mortgage
- Or investing each month instead

### 3\. Choose your investment return

This is your assumed yearly return if you invest instead.

A common long-term assumption is **5–8%**, but you can adjust this.

### 4\. Set your time period

Choose how many years you want to compare.

This shows how both strategies play out over time.

## What the results show

You’ll see two clear outcomes:

### 🏡 Overpaying your mortgage

- How much interest you could save
- How much earlier your mortgage could be paid off

This is a **guaranteed return**, based on your interest rate.

### 📈 Investing instead

- The potential value of your investments over time

This is **not guaranteed**, but offers higher upside.

### ⚖️ The difference

The tool compares both outcomes so you can see:

- Which option could leave you better off financially
- The trade-off between certainty and growth

## Important to remember

- Mortgage overpayments = **low risk, guaranteed return**
- Investing = **higher potential, but with risk and volatility**
- The “best” choice often depends on your goals, risk tolerance, and time horizon