Deciding whether to overpay your mortgage or save depends on whether your mortgage interest rate is higher than the after-tax interest rate on savings. If your mortgage rate is higher, overpaying is generally better, saving you on interest. If savings rates are higher, saving is often better.
As a general rule, if your mortgage rate is around the same, or higher than, your savings rate, then it makes sense to overpay. However, if your savings account has a higher interest rate than your mortgage, then it would be better to put any spare cash into that savings account and let it build interest.
Paying off your mortgage early can be a smart financial move, potentially saving you thousands in interest over the life of the loan. Since the interest charged on debt is usually higher than the returns you'd earn on savings, using spare cash to reduce your mortgage balance can often make good sense.
If you have a fixed-rate mortgage, you'll have an annual overpayment allowance (AOA), which is the amount you can overpay each year without incurring any charges. Your AOA is equivalent to 10% of the outstanding balance of your mortgage.
One effective way to pay off your mortgage faster is by making overpayments. Essentially, this means paying more than the standard monthly amount. Even small additional payments can reduce the interest you owe and shorten your mortgage term over time.
Overpaying can help you save £1,000s, possibly £10,000s, over the life of a mortgage. Overpayments don't have to be big bucks. Even a regular monthly overpayment of £20, £50 or £100 can substantially reduce the interest you pay, shorten your mortgage term, and may even overshadow savings interest.
Speaking to 5 Live's Nihal Arthanayake, Martin Lewis said: “If your mortgage rate is higher than you can earn in savings, than overpaying mathematically adds up.” “The big advantage of overpaying your mortgage too is that it reduces the term, and you pay interest for a shorter amount of time.”
To pay off a 30-year mortgage in 10 years, you must make significantly larger payments by refinancing to a shorter term (like 10 or 15 years) or by aggressively making extra principal payments through methods like rounding up payments, making bi-weekly payments (which adds one extra payment yearly), using bonuses/tax refunds, and ensuring extra money goes directly to the principal, requiring substantial budget adjustments and discipline to significantly reduce the principal balance much faster than the original schedule.
In fact, according to Public Policy Institute of California, 58 percent of California's equity millionaires, as of 2020, had successfully paid off their mortgages.
If your savings aren't earning much interest, it may be better to use them to pay off a mortgage that is accruing interest. However, if your savings are in high-interest rate savings accounts like high yield savings accounts or savings bonds, you might want to prioritize long-term growth.
“Paying off your mortgage early seems impossible but it is completely doable and people do it all the time, but how can you do it and why would you want to put in the extra effort? Paying off your mortgage early will rev up your wealth building.”
If your mortgage rate is similar or higher than your savings rate, overpaying can be beneficial. Considering the current financial climate can help you make your decision. For example, if interest levels on saving deposit accounts are low, using spare cash to pay extra on your mortgage may make more sense.
The 3-7-3 Rule in mortgages isn't a loan type but a federal timeline from the TILA-RESPA Integrated Disclosure (TRID) rule, ensuring borrower protection by mandating disclosures within 3 business days of application, a 7-business-day wait between the initial Loan Estimate and closing, and another 3-day wait if significant changes (like APR) occur, giving borrowers time to review costs before committing to a loan.
Paying off a loan may help you reduce your DTI and qualify for a mortgage, but it could also drop your credit score a few points, so it may be better to reduce your overall debt balance but not pay off any loans or credit cards in full.
The average age to pay off a mortgage in the U.S. is around 62, with many becoming mortgage-free in their early 60s, coinciding with or just after typical retirement age, though figures vary by source. While some financial experts suggest paying it off by 45 for aggressive investing, data shows a significant portion of homeowners, especially older ones (60+), are mortgage-free, but increasingly, older adults (60s, 70s, 80s) carry more mortgage debt than previous generations, according to Marketplace.
Some mortgages may only allow you to overpay a certain amount each year or may charge a fee for overpayments. It is also essential to assess your overall budget to gauge if you can afford lower liquid savings. Overpaying your mortgage could mean that you have less cash available for other expenses or emergencies.
The hidden fees of overpayments.
If you're on a fixed-rate mortgage, most lenders allow you to overpay up to 10% of your outstanding balance each year without any penalty (this may vary by lender). If you go over that limit, you could be charged an Early Repayment Charge (ERC), usually between 1%- 5%.
The amount you can borrow is based on your salary. Most lenders will loan around 4-4.5 times your income. So, to get a £100,000 mortgage, you'll need to earn between £18,000 and £25,000. This is below the average UK annual salary, currently £39,039 (January 2026).
No matter how much extra you pay each month, that amount can help shorten the life of your loan. Even making one extra mortgage payment each year on a 30-year mortgage could shorten the life of your loan by four to five years.
Time your Mortgage Overpayments
Your interest could be calculated daily, monthly, quarterly, or annually. If your mortgage interest is calculated daily, then you can make mortgage repayments at any time. However, if it isn't, Sprive suggests you make the payment a day before the interest is calculated.