Wealth Builder: The Universal Payoff vs. Invest Simulator
Determine whether your capital works harder in the market or by eliminating debt. This 2026 model factors in inflation erosion and tax impacts to reveal your true net worth trajectory.
The Bottom Line: Data Over Instinct
This calculator compares the guaranteed return of debt repayment with projected market growth. In 2026, the most important variable is purchasing power. If your fixed loan rate is below inflation, your debt is shrinking in real terms over time.
How to Read the Results
Scenario A: Wealth Builder – Your assets remain invested and compound over time while inflation reduces the real value of fixed-rate debt.
Scenario B: Debt Destroyer – You earn a guaranteed return equal to your interest rate by eliminating debt.
The Logic: Effective Real Rate
Real Rate = Nominal Interest − Inflation − Tax Savings
Frequently Asked Questions
Is it better to pay off my mortgage or invest in the stock market?
In purely mathematical terms, investing often wins when your expected long-term, after-inflation stock returns are noticeably higher than your mortgage rate. For example, the S&P 500 has returned roughly 6–7% per year after inflation over many decades, while many fixed-rate mortgages are in the 3–5% range. However, markets are volatile and some prefer the guaranteed return of debt repayment.
How does this calculator compare paying off debt versus investing?
The calculator models two main paths: using extra money to invest, or using it to pay down debt more quickly. It factors in interest rates, expected returns, inflation, and taxes to show how each choice affects your net worth in today’s dollars over time.
Should I account for taxes when I compare investing vs debt payoff?
Yes. Investment returns are usually taxable, while the benefit of paying off debt is normally tax-free. Your after-tax return can be several percentage points lower than the headline number, which is why the calculator lets you include tax rates.
Does inflation make paying off debt better or worse?
Inflation reduces the real cost of fixed-rate debt because future payments are made with money worth less than today. If your loan has a low fixed rate and inflation stays high, the real burden of that debt shrinks over time.
What is the “psychological benefit” of being debt-free?
Many people find that eliminating debt significantly reduces financial stress. Studies show becoming debt-free can improve peace of mind and focus, meaning the right choice is about both math and your personal comfort with risk.