Is it better to pay extra monthly or one lump sum?

For the same total money, a lump sum saves more, because the balance drops immediately and every later interest charge is calculated on the smaller figure. In practice the better plan is whichever one you will actually keep doing.

How much does $200 a month extra save on a mortgage?

On a $350,000 loan at 6.5% over 30 years, about $108,000 of interest, with the loan cleared roughly six years early. The saving depends heavily on your rate and how early you start.

Should I pay off my mortgage or invest?

Overpaying gives a guaranteed, tax-free return equal to your rate. Investing may return more but is not certain. Most people clear high-rate debt first, keep an emergency fund, capture any employer match, and only then compare the mortgage rate against expected after-tax returns.

Do biweekly mortgage payments really work?

Yes, but not for the reason usually given. Twenty-six half-payments equal thirteen monthly payments a year instead of twelve, and that extra payment does nearly all the work. You can replicate it free by adding one twelfth of your payment each month.

Will my lender let me overpay?

Almost always, but check for a prepayment penalty in your note, and always mark extra money as principal-only. Some servicers otherwise hold it toward the next scheduled payment, which gives you no benefit.

How to Pay Off Your Mortgage Early, and When Not To

Why it works so well

Your scheduled payment is divided by the lender: interest first, remainder to principal. An extra payment is not divided. All of it comes off the balance, and every future interest charge is then calculated on that smaller number.

On a $350,000 loan at 6.5% over 30 years, the total interest is $446,406. Add $200 a month and it falls to about $338,000 — a saving near $108,000 for roughly $17,000 of extra payments, with the loan gone six years sooner.

The return is certain. There is no market risk, no tax on the gain, and no sequence-of-returns problem. A 6.5% mortgage overpayment is a guaranteed 6.5% return.

Six methods, ranked by what they actually save

1. A fixed monthly overpayment

The simplest and, for most people, the best. Set a standing order for an amount you will not miss and mark it principal-only. $100, $200, $500 — the number matters less than the consistency.

Model your own figure with the extra payment calculator before you commit, because the result is usually larger than people expect.

2. One extra payment a year

Divide your monthly payment by twelve and add that to each month. On a $2,212 payment that is $184 extra a month, and it produces one additional full payment each year. This is the mechanism behind every biweekly plan, done for free.

3. Biweekly payments

Paying half your payment every fortnight means 26 half-payments a year, which equals thirteen monthly payments instead of twelve. The saving is real — around $103,000 and just under six years on our example loan.

But understand where it comes from. Almost none of the benefit is the fortnightly timing; nearly all of it is that thirteenth payment. Which means a servicer charging a setup fee or a monthly administration charge is selling you something your own bank does for nothing. Check the arithmetic on the biweekly comparison.

Two routes to the same destination. The paid biweekly plan and the free DIY version arrive within a few dollars of each other.

4. Lump sums

A bonus, an inheritance, a tax refund. For the same total money a lump sum beats gradual overpayment, because the balance drops immediately and stays lower for longer. Applied early in a loan, the effect is dramatic.

5. Refinancing to a shorter term

Moving from 30 years to 15 raises the payment substantially and cuts total interest enormously. It is the only method on this list that is not reversible — you have contracted to the higher payment. Do it only if the new payment is comfortable in a bad month, not just a good one.

6. Recasting

Less well known. After a large principal payment, some lenders will recalculate your monthly payment across the remaining term for a small fee, typically a few hundred dollars. You keep the original end date but pay less each month. This is the opposite of paying off early — it is for freeing cash flow, not saving interest.

Four traps

The servicer applies it to next month

The most common and most costly mistake. If you do not specify, some servicers hold extra money toward your next scheduled payment rather than reducing the balance. You get no benefit at all. Label every extra payment as principal-only and verify on the following statement.

Prepayment penalties

Uncommon on conventional US mortgages since 2014, but they exist, particularly on non-QM and investor loans. Read your note before you start.

Losing the emergency fund

Money in a mortgage is extremely difficult to get back out. You need a cash-out refinance or a HELOC, and both require you to qualify — which is hardest exactly when you most need the money. Keep three to six months of expenses liquid first.

Overpaying the wrong debt

If you carry credit card debt at 22% while overpaying a 6% mortgage, you are losing 16 points a year on every dollar. Clear the expensive debt first, always.

Order matters more than effort. High-rate debt first, then the emergency fund, then any employer match, then the mortgage.

When you should not do it

The case against is stronger than mortgage-payoff enthusiasts admit.

You have a very low fixed rate

Anyone holding a 2.75% or 3.25% mortgage from the 2020–2021 window is borrowing below inflation. Overpaying it returns 3%, guaranteed, when cash in a decent savings account may pay more with no loss of access.

You are not getting your employer match

A 50% match on retirement contributions is an immediate 50% return. Nothing on your mortgage competes.

You might move soon

Overpayment builds equity you will realise on sale — but so would keeping the cash, and the cash stays accessible. If a move is likely within a few years, liquidity is worth more.

Your rate is variable

Overpaying an adjustable loan is sound, but the calculation shifts every reset. Model it at the cap, not at today's rate.

A workable decision rule

Compare your mortgage rate against three things, in order:

Your most expensive other debt. If anything costs more, pay that instead.
Your emergency fund. Below three months of expenses, build that first.
Your realistic after-tax investment return. Not the headline stock market average — your actual expected return after tax and fees, discounted for the fact that it is uncertain and the mortgage saving is not.

If your mortgage rate still wins, overpay. If it is close, split the difference; the psychological value of a shrinking balance is real and worth something even when the spreadsheet is neutral.

How to pay off your mortgage early