Kefiw

Archived noindex page. Kefiw's public focus is Property decision help.

Archived page

This older Kefiw page is kept for reference, marked noindex, and removed from the primary sitemap. The current Kefiw experience is focused on property decisions: cost, quotes, damage, buying, selling, owning, and packets.

Go to Property

Extra Mortgage Payment vs. Invest: How to Decide

The rate-vs-return comparison, plus the emotional math most people ignore.

Stop guessing and turn your next $500/mo into the optimal move.

Every dollar of extra principal earns you a guaranteed return equal to your mortgage rate. Every dollar invested has an expected return with volatility. The decision is not moral — it is arithmetic plus psychology.

Quick answer

Stop guessing and turn your next $500/mo into the optimal move.

What you are trying to do
The rate-vs-return comparison, plus the emotional math most people ignore.
Best next step
Mortgage Extra Payment Calculator
Limit to remember
Treat this as a practical aid for the task, not a replacement for professional judgment.

Key points

  • ▸ On a $400k, 7%, 30y mortgage, $200/mo extra saves roughly $88k in interest and cuts ~6y 8m off the term.
  • ▸ The guaranteed "return" from paying early is your rate: 7% here. Tax-adjust if you itemise — effective return is closer to 5-6%.
  • ▸ Long-run S&P 500 real return is ~7%. After-tax in a taxable account, maybe 5-6%. In a 401k match, it is effectively much higher.
  • ▸ Rule of thumb: mortgage rate under 5% — invest first. Over 7% — pay down first. Between is a judgement call.
  • ▸ Never skip the 401k match to pay extra on the mortgage. A 100% match is not beaten by any mortgage rate.

Examples

  • The $200/mo question
    $400k loan at 7%. Extra $200/mo saves ~$88k interest and 80 months. Same $200/mo at 7% compound growth for 23.3 years (remaining term after payoff) = ~$138k. Investing wins — if you actually invest.
  • The 3% mortgage era
    If you locked a 3% mortgage in 2021, extra payments earn you 3% guaranteed. A Treasury bill pays more. Do not pay this mortgage early.
  • Peace-of-mind premium
    Some households value debt-free living at more than arithmetic optimum. Fine — but know the cost. Pre-paying a 5% mortgage vs investing at 7% is buying emotional relief at ~2%/yr.

When to use which tool

Related

Frequently asked questions

› Is a biweekly schedule the same as one extra payment a year? Trust & accuracy

Almost — biweekly gives you 26 half-payments = 13 full payments/year. One extra payment/year is a simpler version of the same effect.

› Does paying extra change my required monthly payment?

No. Extra principal shortens the term but the required monthly stays the same until the loan is paid off, unless you request a recast.

› How should I use this guide with a Kefiw tool? How-to

Use the guide as the plan and the linked Kefiw tool as the check. Read the steps first, try the move manually, then use the tool to compare outputs, catch edge cases, and decide whether the result actually fits your task.

› What mistake do tool guides help avoid? Troubleshooting

Tool guides help avoid using a utility mechanically without understanding what you are trying to accomplish. Most word, writing, and text utilities are fast, but speed can hide context mistakes. Know whether you are solving a puzzle, cleaning copy, drafting a line, or checking a rule.

› Can a tool guide help me learn the skill? How-to

A tool guide can help you learn if you pause before accepting the output and ask why it worked. Compare your first guess with the tool result, look for the rule or pattern, and repeat that review. Passive copying solves one task; active review builds the skill.