Aphiwat Punnopakorn, a vice-president of Bangkok Bank, sets aside half of his monthly income for savings and investment each month, including tax-saving instruments.
He invests in all tax-deductible products: provident fund, retirement mutual fund (RMF), long-term equity fund (LTF), life insurance. The LTF is the key instrument in which he is investing monthly at the same amount.
Before filing his personal tax payment form, he will calculate twice in order to cover a maximum of deductible amount.
"Long-term saving is my key objective for investing in LTFs every month with satisfactory returns," said Mr Aphiwat. "Risk diversification is an important reason for monthly investment."
He said savings and investment discipline is an important factor in building financial stability for the long term.
For the RMF, he has invested in gold funds for a few years. Normally he will buy units near year-end in preparation for his personal income tax payment.
Mr Aphiwat said a tax-saving instrument such as a 24-month fixed-deposit account can also cut tax expense.
Sujittra Wongchompoo, 33, a private company employee, said she tries to find suitable times to invest in existing LTFs twice a year _ probably in the first half and second half of each year.
Her investment behaviour reflects personal financial management and risk diversification, while promotional campaigns offered by banks are also taken into consideration.
"Normally there are promotional campaigns for LTF investments near the end of the year, and I'll wait for such benefits," she said.
She uses provident funds, mortgage interest expense and parental-care tax deductions to reduce her personal income tax.