Mortgage & Investing
Will I be better off in 20 years if I invest instead of overpaying my mortgage?
You could be. Investing may produce more money over 20 years, but the result depends on the return achieved. Overpaying gives you a certain reduction in mortgage debt and interest instead.
Quick answer
A 20-year result depends on your mortgage and the investment return achieved. The engine compares both paths over the entered mortgage horizon; use a 20-year remaining term to explore this question.
What does ‘better off’ mean?
It means comparing your overall financial position after the same 20-year period.
It is not enough to look only at the value of the investment.
The comparison also needs to include:
- how much mortgage debt remains
- how much mortgage interest has been paid
- how much sooner the mortgage is cleared
- the value of the investment
- what happens to your mortgage payment after the loan is repaid
Wayli uses the same amount of spare money in both paths so that the comparison is like for like.
What happens if you overpay?
You add your spare money to your normal mortgage payment.
The overpayment reduces the capital you still owe. Future interest is then calculated on the reduced mortgage balance.
Over 20 years, this may:
- reduce the total mortgage interest charged
- reduce the amount you still owe
- help you become mortgage-free sooner
- release your normal mortgage payment earlier
If the mortgage is cleared before the end of the 20 years, Wayli assumes the released payment is invested for the remaining months.
This prevents the comparison from treating the overpayment path as though the freed-up money simply disappears.
What happens if you invest?
You continue making your normal mortgage payments and invest the spare money instead.
The mortgage follows its original repayment path. You therefore do not receive the interest saving created by overpaying.
The investment has 20 years in which to receive contributions and potentially grow.
The final value depends on the investment return achieved. A return entered into the engine is an assumption, not a guaranteed result.
Why time matters
Investment growth can build on earlier growth. This means a long period such as 20 years may strengthen the investing path.
Mortgage overpayments also build on themselves. Reducing the mortgage balance earlier means less interest is charged later.
Both choices benefit from acting sooner, but in different ways.
What could change the answer?
Investing is more likely to finish ahead when the investment return is higher than the financial benefit created by overpaying.
Overpaying becomes stronger when:
- the mortgage rate is higher
- the investment return is lower
- the mortgage has many years remaining
- certainty matters more than possible growth
Compare the same 20 years
Set your remaining mortgage term to 20 years and enter your mortgage, monthly payment, spare cash and assumed investment return. Wayli will compare the certain effect of reducing your mortgage with the possible future value of investing.
Compare both 20-year pathsRelated explainers
Related questions
Educational comparison only. Returns are not guaranteed. This is not personalised financial advice; check your mortgage terms and early repayment charges.