Sale property income tax/business tax?

[Destiny1990]

Hi in 2010 we bought a land with a house.

The Land is in son his name with his thai pasport and the house is in my name.

we never lived in that property it was mostly rented out during the years. Now will we sell the land and the house.

How I understand there will be an Withholding tax of 1% but  how about Income tax or specific business tax for this property? We did own this property for over 12 years but we haven’t been living in it or been registered with this property. How will they calculate?

I understand about stamp duty 0,5% and the 2% transfer fee.

thanks in advance.🙏