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The instalment stays the same every month. Each payment covers that month's interest first, and whatever remains reduces the principal. As the principal falls, so does the following month's interest, so later payments retire the balance far faster than early ones.

Most Thai banks cap total loan repayments at around 40% of gross monthly income, then convert that capacity into a principal — underwritten at a rate above the promotional one, so the borrower can still pay once the teaser period ends.

Compare the interest left on your current loan against the total interest on the new one, then subtract the refinancing fees. A lower rate stretched over a longer new term lowers the monthly payment but can still cost more overall.

A longer term lowers the monthly payment and raises how much you can borrow, but costs considerably more interest overall. Thai banks generally cap terms at 30 years, and usually require the borrower's age plus the term to stay under 65-70.