The Revenue Department, the government's primary tax collection agency, is proposing extending tax breaks for consumers and companies for another year.
Director-general Sutthichai Sungkamanee said the extension would cover corporate taxes, personal income taxes and value-added tax. The reasons are technical and related to the ongoing political conflict.
The Yingluck Shinawatra government earlier approved cuts in the corporate tax rate to 20% from 30% and a move to a seven-tier ladder for personal income tax rates from five as a means of boosting the economy and reducing tax burden.
Personal tax rates were also adjusted, with the highest rate cut to 35% from 37% and the lowest to 5% from 10%.
But Mr Sutthichai said the tax rates were implemented based on the executive authority of the government rather than a formal amendment of the tax code through parliament.
"No one can say when we will have a new government. And even once a new government is formed, the process of amending the tax code in parliament will take time," he said.
"If the amendment cannot be approved by the end of the year, it would mean that tax rates, both corporate and personal, would have to revert to the previous rates, which would certainly affect both the corporate sector and consumers."
Mr Sutthichai suggests the caretaker government issue a decree extending the current tax rates for another year, which would help reduce uncertainty but would not be an onerous imposition if policies changed under a new government.