Refinance Savings Calculator (Singapore, 2026)

Quick start

This calculator is designed to answer one narrow question: does switching your home loan produce meaningful savings after fees and penalties? It is most useful when you already have a real quote in hand and want a disciplined first-pass answer before spending time on paperwork.

What this calculator helps estimate

It compares your current loan path against a new loan path over a chosen horizon. The result is not just a headline rate comparison. It estimates monthly repayment difference, interest saved, break-even timing, and net savings after one-off switching costs. That is important because a lower rate can still be a poor decision if the package friction is high or if you are unlikely to keep the loan long enough.

How to use this calculator well

1. Use your actual outstanding balance, not the original loan amount.
2. Use a realistic remaining tenure and a realistic comparison horizon. If you may sell, upgrade, or refinance again soon, model a shorter horizon.
3. Include legal fees, valuation fees, clawbacks, subsidies to be repaid, and any lock-in penalty. Small omissions can turn an apparently attractive refinance into a weak one.
4. Read the result in sequence: monthly savings first, then break-even months, then net savings after friction.

How to interpret the result

A refinance result usually becomes more convincing when three things line up at the same time: the monthly repayment drops meaningfully, the break-even period is short enough for your likely holding period, and net savings remain attractive after costs. If only one of those is true, the refinance may still be mathematically positive but practically weak.

This is why break-even matters. A package can show a lower interest rate and still fail your real-life decision test if you are likely to sell, move, or switch again before the savings recover the upfront cost. On the other hand, a slightly lower rate can be very worthwhile when the balance is large and the remaining tenure is still long.

Scenario library

• Large balance, meaningful rate drop: A borrower with a large outstanding balance and many years left on the loan often benefits most because the interest base is still large. Even moderate rate improvements can compound into real savings.
• Short remaining holding period: A borrower planning to upgrade or sell within the next 12 to 24 months may find that the refinance looks attractive on paper but never really pays back the switching cost.
• Small monthly savings, high friction: If the repayment falls only slightly but legal and penalty costs are sizeable, the cleaner answer may be repricing or simply waiting rather than refinancing immediately.

Common mistakes

• Comparing only the interest rate headline and ignoring the fee stack.
• Using the full remaining tenure as the horizon when you realistically expect to change your loan or property plans much earlier.
• Assuming that a package with subsidies is automatically cheaper without checking clawback conditions.
• Treating monthly savings as the whole answer instead of asking how long it takes to recover costs.

Methodology and assumptions

This model assumes a standard amortising monthly home loan and compares your current path against a replacement path using the same outstanding balance and remaining tenure. It is intentionally simplified: it does not replicate every lender's package structure, board rate reset, or legal subsidy condition. Use it to decide whether the case deserves deeper review, not as a substitute for the bank’s final documents.

Practical takeaway

The best refinance decisions are usually not driven by the biggest advertised rate cut. They are driven by net savings after friction and by whether you will hold the loan long enough for the savings to become real. If the break-even period is comfortably shorter than your likely holding period, the refinance deserves serious attention. If the margin is thin, treat the output as a prompt to negotiate harder, reprice instead, or wait for a better package rather than rushing into a marginal switch.

When the break-even month can mislead you

Break-even is helpful because it simplifies the refinancing question into one time test: how long before the lower rate repays the switching cost? But break-even can mislead when the comparison horizon is unrealistic or when the package comes with strings that the headline rate does not reveal. A refinance that breaks even in 14 months may still be weak if you are likely to sell, partially prepay, or refinance again before the savings can compound. A refinance that breaks even in 20 months may still be excellent if you have a long hold ahead and the package terms are clean.

The better interpretation is to compare break-even against your realistic control period. That control period is the time you are genuinely likely to keep the loan in roughly the same structure before another major change becomes likely. Sale plans, lock-in windows, expected cash windfalls, and even family moves matter here. If the break-even period consumes too much of that window, the refinance is weak no matter how attractive the rate headline looks. If it clears comfortably early, the case strengthens materially.

This is also where friction matters. Some households over-focus on legal or valuation fees and underweight operational hassle, timing risk, and package complexity. Others do the opposite and reject a strong refinance because the paperwork feels annoying. The calculator helps by forcing a more disciplined question: after all costs, over my real holding period, is this switch meaningfully better than staying put?

A cleaner refinance decision sequence

Use this calculator after you already know three things: the current package you are on, the realistic alternative you can actually get, and whether repricing is available. Then run the sequence in order. First, compare refinance versus reprice at the same decision horizon. Second, test the new package under a slightly shorter holding period. Third, ask whether you would still proceed if rates moved less favourably than hoped. This reduces the temptation to choose the package with the prettiest promotional rate rather than the one with the strongest net result.

Pair this page with refinance vs reprice for the decision frame and home loan refinancing costs for the friction layer. The point is not to refinance often. The point is to refinance only when the net advantage is real, durable, and worth the switching effort.

What to do if the savings are positive but still feel weak

A refinance can show positive net savings and still be a poor move when the advantage is too small relative to the hassle, uncertainty, or new lock-in constraints. This usually happens when the household is comparing a mildly better rate across a short remaining horizon, or when promotional terms make the package look stronger than it really is. In those cases, the right move may be to use the output as a negotiation tool, not an instruction to switch immediately. A small positive result can still be useful if it helps you pressure the current bank into a cleaner repricing outcome.

It also helps to run one deliberately worse case. Raise the remaining horizon uncertainty, shorten the expected hold, or increase the friction cost. If the advantage disappears too easily, the refinance is fragile. If it stays clearly positive, the decision is more robust. That is the mindset that turns this page from a simple calculator into a filter for better package decisions.

FAQ

References

• Monetary Authority of Singapore (MAS) guidance and lender documents for home loan package terms.
• Actual letters of offer, lock-in clauses, clawback conditions, and legal/valuation fee quotes from your bank and conveyancing provider.

• MAS

Last updated: 25 Mar 2026· Editorial Policy, Advertising Disclosure, and Corrections.