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Financing guide · Prepayment

Making a partial mortgage prepayment: rules and penalties

By Winfred Quek, Associate Marketing Consultant · CEA R073319H · Crestbrick Pte Ltd (L31010886H) · Published 13 July 2026

Facts verified: 13 July 2026 · Prepayment allowances and penalty rates vary by bank and package and can change; verify your specific loan terms · Sources attributed below

A question that comes up more often than people expect: a client gets a bonus, an inheritance, or simply builds up spare cash, and wants to throw a chunk of it at the mortgage rather than let it sit in a low yielding account. The instinct is sound. The mistake is assuming it works the same way a full loan redemption does. Partial prepayment during lock in is its own animal, with its own allowance and its own penalty structure, and getting the mechanics wrong can turn a smart financial move into an avoidable fee.

Partial prepayment is not the same as full redemption

It helps to separate these two clearly before anything else. A full early redemption means closing out the entire outstanding loan before your lock in period ends, typically because you are selling the property, refinancing to another bank, or paying off the loan entirely from other funds. A partial prepayment means paying down some of the outstanding balance while keeping the loan itself running. Banks treat these differently in their letters of offer, with full redemption penalties generally structured separately from, and often calculated differently to, partial prepayment penalties. If you are planning a large voluntary payment, confirm which category it falls into before you commit, because the fee schedule that applies is not necessarily the same one.

What most banks actually allow each year

Within the lock in period, most Singapore bank loan packages carve out a penalty free allowance for partial prepayment, commonly expressed as a percentage of the outstanding loan balance or of the original loan quantum, that resets annually. Above that threshold, a percentage based fee applies to the excess amount prepaid. The specific percentage allowed, and the specific penalty rate charged above it, differ from bank to bank and from package to package within the same bank, so there is no single number that applies market wide.

How the penalty is usually calculated

Where a penalty applies, it is generally charged as a percentage of the amount prepaid that exceeds your free allowance, rather than as a flat administrative fee. This means the penalty scales with how far over the free threshold you go, which is worth modelling before you decide how much to pay down in one go. A prepayment that stays just inside the free allowance costs nothing. The same prepayment amount split slightly wrong, spilling a small amount over the threshold, can trigger a percentage fee on the excess portion, and sometimes banks apply the penalty to the whole prepaid amount rather than just the excess depending on how the clause is drafted. Read the specific wording carefully rather than assuming the more intuitive interpretation applies.

Should the extra cash go to the mortgage at all

Before deciding how much to prepay, it is worth asking whether prepayment is even the best use of the cash. Your mortgage rate, currently around 1.5 percent for a typical bank loan package in the current environment, is the rate you are effectively earning by paying down debt early. If you have other financial priorities, an emergency fund that is not yet fully funded, higher interest debt elsewhere, or an investment opportunity with a credible expected return well above your mortgage rate, those may be a better use of the same cash. Prepayment is a guaranteed, risk free return equal to your loan rate, which is attractive precisely because it is guaranteed, but it is not automatically the single best use of every spare dollar.

Timing your prepayment around the lock in calendar

Because the free allowance typically resets each year of the lock in period, timing matters. If you have a large sum available, it is often more efficient to spread it across two calendar years of the loan, prepaying up to the free allowance in one year and the remainder just after the allowance resets, rather than prepaying the full amount at once and paying a penalty on the excess. This only works if your cash timeline allows the wait, and it is worth running the actual numbers, penalty saved versus opportunity cost of holding the cash a little longer, before deciding.

Instalment reduction versus tenure reduction

When your prepayment is processed, ask your bank explicitly whether it will reduce your monthly instalment while keeping the same tenure, or keep the instalment the same and shorten the tenure instead. Some banks default to one approach, some let you choose. If your priority is minimising total interest paid over the life of the loan, keeping the instalment level and shortening the tenure generally achieves more of that goal than reducing the monthly payment, because it gets the principal down faster. If your priority is near term cash flow relief, a lower instalment on the same tenure achieves that instead. Neither is wrong, but you should choose deliberately rather than accept whatever the bank defaults to.

A practical approach before you prepay

1. Pull your letter of offer and find the specific prepayment clause. Confirm the free allowance percentage, how it is calculated, and the penalty rate on any excess.
2. Confirm whether you are still within the lock in period and how much of it remains. The penalty structure and your incentive to wait both depend on this.
3. Decide instalment reduction versus tenure reduction before you submit the request. Do not leave this to the bank's default.
4. Weigh prepayment against other uses of the same cash. A guaranteed return equal to your mortgage rate is good, but confirm it beats your realistic alternatives first.

None of this is complicated once you have the actual terms in front of you. The mistake to avoid is treating "I can prepay some of my loan" as a single simple fact rather than a bank specific, package specific set of rules that rewards a buyer who reads the fine print before writing the cheque.

Frequently asked questions

Can I make a partial mortgage prepayment during my lock in period?

Usually yes, most Singapore home loan packages allow some amount of voluntary partial repayment even while you are inside the lock in period, but it is not unlimited and it is not automatically free. Banks typically allow a certain amount each year, often expressed as a percentage of the outstanding loan or the original loan quantum, without penalty, and charge a percentage based fee on any amount above that threshold. The exact allowance and fee vary by bank and by package, so you need to check your specific loan's letter of offer.

How much can I prepay penalty free each year on a Singapore mortgage?

This varies by bank and by package rather than following one fixed rule across the market. Some packages allow a partial prepayment of a defined percentage of the outstanding loan each year without penalty, others tie the free allowance to the original loan amount, and some packages allow no penalty free partial prepayment at all during lock in. The only reliable way to know your number is to check the specific terms in your letter of offer or ask your bank directly.

What is the penalty if I prepay more than the free allowance?

Banks that charge a prepayment penalty typically apply it as a percentage of the amount prepaid above your free allowance, rather than a flat fee. The exact percentage differs from bank to bank and package to package, and can also differ for a full early redemption versus a partial prepayment above the allowance. Always ask your bank for the specific number that applies to your loan before making a large voluntary payment during lock in.

Does a partial prepayment reduce my monthly instalment or shorten my loan tenure?

This depends on how your bank structures the prepayment and what you request. Some banks will recompute your monthly instalment down while keeping the original tenure, others will keep the instalment the same and shorten the tenure instead, and some let you choose. If your goal is to reduce total interest paid over the life of the loan, shortening the tenure while keeping the instalment level generally achieves more of that than lowering the monthly payment, so it is worth specifying your preference when you make the request.

Winfred Quek is Associate Marketing Consultant at Crestbrick Pte Ltd, advising Singapore upgraders, investors and families. CEA R073319H. The information on this page is general and does not constitute financial or mortgage advice. Prepayment allowances and penalty rates vary by bank and package and can change; always verify against your own letter of offer and confirm directly with your bank before making any prepayment.