Finance
Mortgage
Strategy
A mortgage front-loads interest: in the early years, most of each payment is interest, not principal. Anything that adds to principal early compounds into large lifetime savings , but the right move depends on your rate and your alternatives.
Tactics that work
- Extra principal, early: a modest recurring extra payment in years 1–10 saves the most, because it removes the highest-interest balance first.
- Biweekly payments: paying half the monthly amount every two weeks yields 26 half-payments, one extra full payment a year, shaving years off a 30-year loan.
- Round up: rounding a $1,840 payment to $2,000 is a painless, automatic principal boost.
- Recast: after a lump-sum principal payment, ask the servicer to recast, same rate and term, lower payment. Compare the fee with refinance costs in recast vs refinance. Not a savings quote.
- Refinance (when rates drop): a lower rate or shorter term can cut total interest, weigh closing costs against the break-even.
See the impact
Model how extra principal and rate changes affect your payoff with the mortgage payment calculator. Extra principal versus a new note: biweekly vs refinance.
When NOT to pay down
- Low fixed rate: if your rate is well below what safe investments return, extra dollars may work harder invested than prepaying.
- No emergency fund: liquidity first, you can’t easily pull cash back out of a paid-down mortgage without a refinance or HELOC.
- Higher-interest debt: clear credit cards and other high-rate balances before prepaying a mortgage.
- Investor cash flow: for rentals, prepaying reduces leverage and can lower your cash-on-cash return, a deliberate trade of yield for safety.
Takeaway
Attack principal early, automate the extra, and use a recast to lock in a lower payment after a lump sum. But check the opportunity cost first, for a low-rate loan, prepaying is a guaranteed return equal to your rate, no more, no less.