Mortgage Retention — Cut Your Rate With One Phone Call to Your Own Bank

Nearly every Thai mortgage follows the same design: three promotional years at an attractive fixed rate, then a float up to a reference rate like MRR minus a small discount — typically a jump of one to two full percentage points. On a three-million-baht balance, that spread quietly drains tens of thousands of baht a year. Most borrowers know only one remedy — refinancing to another bank — while an easier, faster, almost costless tool sits unused: retention, walking back to your own bank and asking for new terms. Here is the mechanism, the timing, and the script that actually works.

What Retention Is, and Why Banks Say Yes

Retention programmes exist to keep good borrowers who are about to refinance away. The bank's willingness to cut your rate is not kindness but arithmetic: if you leave, it loses the entire interest-earning balance and all future revenue. Conceding a rate near market to keep you is strictly less costly than losing you — especially for borrowers with spotless payment records and large remaining balances, exactly the profile other banks fight to poach.

Against refinancing, retention differs on three axes. Speed: refinancing means documents, a fresh appraisal, approval and a mortgage-registration appointment — four to eight weeks; retention often closes in a day to two weeks. Cost: refinancing carries the 1% mortgage registration fee, appraisal and stamp costs; retention is usually free or nominal. Depth: refinancing usually lands a slightly lower rate than retention, because the new bank pays up to win you while your bank only needs to offer "enough to keep you". The decision is always the interest spread weighed against the cost and friction of moving.

Timing and Script — Extracting the Best Offer

The right moment is just before or immediately as the teaser period ends; don't donate months of floating interest first. And never walk in empty-handed. The sequence that works: check your remaining balance and current rate from the app or statement; obtain one or two genuine refinance quotes from other banks — the critical step, because it converts you from "a customer complaining" into "a customer actually leaving"; then call your bank's hotline or branch and say, plainly: "This loan's promotional period has ended. I hold a refinance offer from Bank X at this rate. I'd like the bank to consider retention — if the terms are close, I'll stay." The counter-offer typically arrives within days; compare it coldly against the quote in your hand.

Know the shape of what returns: retention offers usually come as short fixed-rate packages or deeper MRR discounts, tied to a lock-in against early closure or refinancing for one to three years — read that clause before accepting. And if the first offer still trails your refinance quote, negotiate a second round; retention officers hold tiered approval limits, and the more genuine your evidence of leaving, the deeper the tier they unlock.

Which Path — a Decision Table

Situation	Usually better	Why
Post-retention spread ≤ 0.25%	Stay (retention)	Small spreads don't repay the 1% registration fee and weeks of effort
Spread still ≥ 0.5% with a large, long balance	Refinance	Compounded long-term savings clearly beat switching costs
Small balance (under ~1M) or nearly paid off	Retention or do nothing	The interest base is too small for moving fees to pay back
Recent credit-bureau blemishes	Retention	A new bank scrutinises history; your current bank already sees you pay
Want extra funds (top-up) for renovation	Refinance with increased facility	Retention cuts the rate; it rarely adds money

A quick feel for the numbers: on 2.5M THB with 20 years left, every 0.25% saved is roughly six thousand baht in year one, tapering with the principal. If refinancing beats retention by 0.4% but costs ~30,000 THB all-in, breakeven arrives around year three — worth it if you'll stay long, but if you plan to sell or pay off within a couple of years, retention is the smarter answer.

FAQ

Will asking for retention hurt how the bank sees me, or my credit?

No. Retention is a standard service with dedicated teams; nothing negative reaches the bureau. If anything, borrowers who negotiate are flagged as valuable customers worth keeping.

How often can I do this?

Retention deals carry 1–3 year lock-ins; once each expires, ask again. Skilled borrowers calendar their rate against the market at every lock-in expiry and negotiate routinely across the 30-year life — a habit worth several hundred thousand baht in total.

What if my bank refuses outright?

Then you have the clearest possible answer — refinance — and the new bank's quote is already in your hand, so you proceed without losing a single day. That is the beauty of collecting the quote before negotiating: whichever way it goes, you win.

Conclusion

Your post-teaser mortgage rate is not fate; it is a price renegotiable every three years. Retention is the highest-return, lowest-effort tool in home finance: one genuine refinance quote, one phone call, one cold comparison — then choose by the table above. Make it a three-year ritual and the same house gets tens of thousands of baht cheaper annually without moving anywhere. Pair this with the full refinancing guide on the MyProperty blog.