What Mortgage vs Invest is for

What you can use it for

The calculators are designed to help with questions like:

• Should I overpay my mortgage or invest instead?
• How much might my savings grow over time?
• How much could I need for an emergency fund?
• What might my take-home pay look like after tax and deductions?

How the calculators work

The tools use simple assumptions so you can get a quick estimate without needing to understand complex financial jargon.

In most cases, the numbers are based on fixed rates, simple tax rules, and steady monthly calculations. Real life can be messier, so the results should be treated as a starting point rather than a final answer.

Our calculation methodology

These calculators are educational tools. They are designed to be transparent, browser-based, and easy to sense-check rather than hidden behind black-box logic.

• Calculations are deterministic, so the same inputs produce the same result.
• Simplified assumptions are shown clearly wherever possible.
• Results are estimates for planning and comparison, not personal recommendations.
• Important decisions should still be checked independently or with a regulated adviser.

What this site does not do

• It does not give personal financial advice.
• It does not know your full circumstances.
• It does not predict future returns, rates, or tax changes perfectly.

How to use the results well

Use the calculators to explore options, sense-check decisions, and understand trade-offs. If a decision is important or involves large amounts of money, it is worth checking the details carefully and getting regulated advice where needed.