Paying down the mortgage early — when it beats saving
Amortising early is a guaranteed return at your loan's rate. Whether to do it is a comparison, not a conviction — here is the arithmetic.
By António Avelar Updated 19 August 2026 3 min read
Somewhere between the first salary raise and the first Euribor scare, most people with a mortgage ask the same question: should I be paying this off faster?
The honest answer is a comparison, not a conviction. Early repayment is one of several places a euro can go, and it competes with the others on rate, risk and access.
What early repayment actually earns
Paying €5,000 off the loan removes €5,000 of debt that was accruing interest at your mortgage rate. The saving is exactly that rate, guaranteed, for the remaining life of the loan — no market risk, no tax on the gain, nothing to manage afterwards.
That framing makes the comparison mechanical. If the loan costs 4% and savings earn 2%, amortising wins. If you fixed a low rate years ago and safe savings pay more than the loan costs, keeping the cash wins — mathematically, holding the debt is profitable. The numbers move; the comparison doesn’t.
Two corrections before trusting it. There is usually an early-repayment commission — capped by law in Portugal, and historically around 0.5% on variable-rate loans and 2% on fixed; waivers have come and gone with the rate cycle, so check what applies the month you do it. And the mortgage rate you compare should be the rate you actually pay now, from the statement — the current TAN, not a memory of it.
What has to come first
Amortised money is gone. Unlike a deposit, you cannot take it back out when the car dies — you turned liquid savings into house.
So the order matters. The emergency fund comes first, whole and untouched; repaying the bank with money you might need back is how a good decision becomes an expensive one. Any debt more expensive than the mortgage — credit cards, personal loans — comes before it too, since the same euro retires a higher rate there.
Early repayment is what you do with genuinely spare money: the surplus after the fund is full and the expensive debt is dead. If you’re not sure a surplus exists, that’s measurable.
Shorter term or smaller payment
When you amortise, the bank asks a question people rarely see coming: keep the payment and shorten the term, or keep the term and shrink the payment?
Shortening the term saves the most interest — every future month you delete was a month of interest. Shrinking the payment buys monthly breathing room instead. Neither is wrong; they are different purchases. Just decide it yourself rather than accepting the default, because the default varies by bank and the difference over a decade is real money.
The habit version
The dramatic version of this — save for years, amortise €20,000 once — works, but it asks for discipline over a long silence, and the money sits exposed to better ideas the whole time.
The quieter version works at least as well: a smaller amount put against the loan every year, perhaps when the subsidy months land. Small annual amortisations early in the loan, when the balance is at its largest and each euro of capital kills the most interest, compound into years shaved off the end. It also keeps the commission small and the decision reversible in spirit — skip a year when life is expensive.
When not to do it
If the rate comparison favours savings, don’t amortise for the feeling. If the emergency fund isn’t full, don’t amortise at all. And if the loan is near its end, the arithmetic goes quiet: the final years of a mortgage are mostly capital anyway, so there is little interest left to save — safe savings will likely serve that money better.
The mortgage is the cheapest debt you will ever hold. Paying it early is sometimes the best use of a euro and sometimes merely the most satisfying one. The statement and a two-line comparison will tell you which — run it once a year and you’ll never have to wonder.