The Moment
You have extra money — from a raise, bonus, inheritance, or simply good cash flow — and you are wondering whether to make extra mortgage payments or invest the money. This is one of the most debated questions in personal finance.
The Rate-Based Framework
Mortgage rate below 5%: Invest. The expected return from index funds (7-10% historically) significantly exceeds your mortgage rate. The mathematical edge compounds dramatically over 15-30 years. $500/month invested at 7% for 20 years = $260,000. $500/month extra on a 4% mortgage saves ~$120,000. The investment path produces $140,000 more.
Mortgage rate 5-7%: Gray zone. The math slightly favors investing, but the guaranteed return from mortgage payoff is competitive. This is a personal preference decision. Both are reasonable.
Mortgage rate above 7%: Pay it off. The guaranteed return from eliminating 7%+ debt is competitive with uncertain market returns — and carries zero risk.
The hybrid approach: Make your regular mortgage payment, invest in tax-advantaged accounts (401(k), Roth IRA), and then split remaining extra cash between mortgage and taxable investing. This captures the tax advantages of retirement accounts while making some progress on the mortgage.
When to Pay Off Regardless of Rate
Approaching retirement: If you will retire in 5-10 years, eliminating your mortgage payment before retirement dramatically reduces your monthly expenses. This means you need less from your portfolio to live, which reduces sequence-of-returns risk.
High stress: If the mortgage causes genuine anxiety — if you check the balance obsessively, lose sleep over it, or make worse financial decisions because of the stress — pay it off. The behavioral benefit of peace of mind is real and has economic value.
Already maxing tax-advantaged accounts: If you have already maxed your 401(k) ($23,500), Roth IRA ($7,000), and HSA ($4,150/$8,300), extra mortgage payments compete only with taxable investing — not with tax-advantaged opportunities. In this scenario, the guaranteed return from mortgage payoff is more attractive.
Run Your Numbers
Enter your mortgage details to compare payoff vs investing.
Mortgage Payoff Planner
What to explore next
- →How do I calculate the break-even between mortgage payoff and investing?
- →Should I make biweekly mortgage payments?
- →When should I refinance instead of paying extra?
Frequently Asked Questions
Should I pay off the mortgage or invest in a Roth IRA?
Roth IRA first — always. Tax-free growth in a Roth IRA is more valuable than the guaranteed return from mortgage payoff at any reasonable mortgage rate. Max your Roth ($7,000/year) before making extra mortgage payments.