Mortgage Prepayment
Mortgage prepayment means paying more than your required payment to reduce principal faster. A $50K prepayment in year 5 on a $300K loan at 6.5% can save ~$73K in interest and cut 8.5 years off the term. Early prepayments have the most impact. Compare with investment returns—if your mortgage rate exceeds expected investment returns, prepayment often wins.
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Early prepayments (years 1–5) have the greatest impact on total interest. Prepayment ROI ≈ your mortgage rate (guaranteed); compare to investment returns. Specify "principal only" when making extra payments. Factor in lost mortgage interest deduction if you itemize.
Ready to run the numbers?
Why: Early prepayments (years 1–5) have the greatest impact on total interest.
How: Extra payments go to principal, reducing the balance. Future interest is calculated on the lower balance, so savings compound over time. Compare: mortgage rate (guaranteed) vs expected investment return (uncertain).
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📊 Prepay Impact
📈 Balance Over Time
🍩 Savings vs Prepay
📊 Prepay vs Invest ROI
For educational purposes only — not financial advice. Consult a qualified advisor before making decisions.
💡 Money Facts
$50K prepay in year 5 on $300K at 6.5% saves ~$73K—146% ROI.
— CFPB
Years 1–5 prepayments save 2–3x more than years 20–25.
— Freddie Mac
Prepayment gives guaranteed return = your mortgage rate.
— Vanguard Research
Vanguard research: prepay when mortgage rate > expected investment return.
— Vanguard Research
$100K inheritance prepay can save $150K+ and 15+ years.
— Bankrate
Partial prepays ($25K) still save significantly—every bit helps.
— Bankrate
Mortgage prepayment means paying more than your required payment to reduce principal faster. A $50K prepayment in year 5 on a $300K loan at 6.5% can save ~$73K in interest and cut 8.5 years off the term. Early prepayments have the most impact. Compare with investment returns—if your mortgage rate exceeds expected investment returns, prepayment often wins.
Sources: CFPB, Freddie Mac, Vanguard Research, Bankrate.
Key Takeaways
- • Early prepayments (years 1–5) have the greatest impact on total interest.
- • Prepayment ROI ≈ your mortgage rate (guaranteed); compare to investment returns.
- • Specify "principal only" when making extra payments.
- • Factor in lost mortgage interest deduction if you itemize.
Did You Know?
How Does Prepayment Work?
Principal Reduction
Extra payments go to principal, reducing the balance. Future interest is calculated on the lower balance, so savings compound over time.
Timing Matters
Early prepayments eliminate interest over more years. A $10K payment in year 1 saves more than the same payment in year 20.
Opportunity Cost
If you invest instead of prepay, you could earn market returns. Compare: mortgage rate (guaranteed) vs expected investment return (uncertain).
Expert Tips
Prepayment vs Invest Comparison
| Mortgage Rate | Prepay? | Invest? |
|---|---|---|
| 6.5%+ | Usually yes | Hard to beat |
| 4–5% | Maybe | Invest may win |
| <4% | Often no | Invest likely better |
Frequently Asked Questions
What is mortgage prepayment?
Prepayment is paying more than your required monthly mortgage payment to reduce principal faster. Extra payments go directly to principal, cutting future interest. A $50K prepayment in year 5 on a $300K loan can save ~$73K and 8+ years.
What is the difference between prepayment and extra payments?
They're often used interchangeably. Prepayment usually means any payment beyond the required amount. Extra payments are typically recurring (e.g., $200/month). Both reduce principal and save interest—specify "principal only" to your lender.
When is the best time to prepay?
Earlier is better. Prepayments in years 1–5 have the most impact because you eliminate interest over the longest remaining term. A $1,000 payment in year 1 can save $2,000+ in interest; the same in year 20 saves much less.
Should I prepay or invest?
Compare your mortgage rate to expected investment returns. If your mortgage is 6.5%+, prepayment offers a guaranteed return. If you can earn 8%+ in diversified investments and have a low rate (4–5%), investing may win. Run the numbers for your situation.
What are the tax implications of prepayment?
Prepaying reduces mortgage interest, which reduces your itemized deduction. If you itemize, you lose that tax benefit. For many homeowners taking the standard deduction, there's no tax impact. High earners should factor in the after-tax cost.
How do I make a prepayment?
Contact your servicer or use their online portal. Specify that the extra payment goes to principal only (not escrow). Many lenders let you set up automatic principal-only payments. Include your account number and "apply to principal" in the memo.
Key Statistics
Official Data Sources
⚠️ Disclaimer: This calculator is for educational purposes. Actual savings depend on your loan terms. Not financial advice. Consider opportunity cost and tax implications.
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