SimpleKit Mortgage vs Invest Calculator

Should you pay down your mortgage or invest?

Compare paying down your mortgage faster vs investing the difference.

See how each strategy may affect your net worth over time without leaving your browser.

Open calculator How it works
Good to know:
  • No signup
  • Free to use
  • Runs entirely in your browser
  • Built for Canadian scenarios
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Quick decision snapshot

Mortgage prepayments offer guaranteed interest savings. Investing may deliver higher expected growth, but with uncertainty.

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How this comparison works

This tool compares two common choices for the same extra cash flow: prepay the mortgage or invest instead.

A mortgage prepayment creates a guaranteed benefit equal to the interest you avoid on that debt. Investing may grow faster over long periods, but market returns can be higher or lower than expected.

The answer often depends on your mortgage rate, time horizon, tax shelter, fees, and how much you value certainty, liquidity, and peace of mind.

Mortgage strategy benefit interest avoided + faster equity build
Invest strategy benefit investment growth - mortgage interest still paid

Keep the tradeoff in context

  • Mortgage savings are predictable. Market returns are not.
  • TFSA and RRSP accounts can improve after-tax investing results.
  • Extra mortgage payments reduce debt, but are less liquid than cash you keep invested.
  • This is a simplified planning tool, not personal financial advice or a tax filing model.

Calculator

Adjust your mortgage, investing, and scenario assumptions to compare the two strategies live.

Inputs

Mortgage inputs

Investment inputs

Advanced settings

Currency values are in Canadian dollars. Blank or invalid inputs fall back to safe defaults.

Side-by-side strategy comparison

The same extra cash flow is routed either to the mortgage or to investing.

Visualize the tradeoff

These charts focus on the most decision-useful trends: net worth, mortgage balance, and investment growth.

Net worth over time

Estimated home equity plus investment value.

Mortgage balance over time

Lower is better for debt reduction.

Investment growth

Shows liquid assets under each strategy, including post-payoff investing when the mortgage is gone.

Interest vs growth outcome

A quick comparison of avoided interest and projected investment gains.

Break-even and sensitivity analysis

Small assumption changes can move the result. This section shows where the comparison may flip.

Break-even return

The required investment return will appear here.

Return scenarios

Horizon comparison

How the outcome shifts over shorter and longer planning windows.

Practical planning insights

Use the numbers as a starting point, then layer in comfort, tax strategy, and real-life flexibility.

When paying down debt may make more sense

Higher mortgage rates, shorter horizons, or a strong preference for certainty often tilt the decision toward prepayment.

When investing may come out ahead

Longer horizons, moderate mortgage rates, and tax-sheltered returns may let investing build more net worth over time.

Risk tolerance still matters

The mathematically higher expected result may still feel wrong if volatility would cause stress or second-guessing.

Guaranteed savings feel different

Interest avoided is effectively locked in, while projected market returns can vary widely from year to year.

TFSA and RRSP choices can change the math

Tax sheltering can improve net investing results, especially when compared with taxable investing that loses some return to drag.

Liquidity can be valuable

Invested money may be easier to access in an emergency than equity locked inside your home.

Canadian context

A few Canada-specific realities are worth remembering when you use this calculator.

  • Mortgage prepayment decisions are common in Canada, especially when rates reset at renewal.
  • TFSA and RRSP accounts can make investing more efficient than a taxable account.
  • Mortgage rates can change materially at renewal, so future borrowing costs may differ from today.
  • Taxable investing often reduces after-tax returns through dividends, interest, and realized gains.
  • This calculator is intentionally simplified and does not model deductions, contribution room, or full tax planning.
  • Use it to frame the tradeoff, then pair it with your broader savings and retirement plan.

Continue your planning

These SimpleKit tools are natural next steps after comparing mortgage prepayments and investing.

Support SimpleKit

If this tool helped you think through the tradeoff, you can help keep the next one free too.

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Mortgage vs invest questions

Plain-English answers for people deciding whether to make extra mortgage payments or invest instead.

Is it better to pay off a mortgage or invest?

Neither option is always best. Paying down a mortgage gives a guaranteed return equal to the interest you avoid. Investing may produce a better long-term result, but only if real returns, taxes, and fees work in your favour.

What mortgage rate changes the answer?

Higher mortgage rates usually make prepayments more attractive because the guaranteed savings become more valuable. Lower mortgage rates give investing more room to outperform, especially over longer periods.

Should I invest instead of making extra mortgage payments?

That can make sense when you have a long horizon, can tolerate volatility, and have access to tax-efficient accounts like a TFSA or RRSP. It may matter less if you want certainty or need to be debt-free sooner.

How does risk affect the decision?

Risk changes both the path and the experience. A projected 6% market return may not arrive smoothly, while mortgage savings are immediate and predictable. Your comfort with swings in account value matters.

Should I use my TFSA before paying off my mortgage?

A TFSA can improve investing efficiency because gains can compound without ongoing tax drag. That may tilt the comparison toward investing, but your mortgage rate, renewal risk, and debt comfort still matter.

What if I care more about peace of mind than maximum expected return?

That is a valid reason to favour mortgage prepayments. Personal finance is not just about maximizing a spreadsheet result. Reducing fixed obligations can make a household feel safer and more flexible.

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