It's complicated. You can see whole here http://bir.gov.ph/ under Property tax in the menu - when the server functions
It's down when I write this.
It's TWO types for PROPERTY tax. (Not to be mixed up with ESTATE tax, which is when SELLING a property.)
/and some tax by property owners support education.
It's MUCH different tax percentages for different:
/location (Double in Metro Manila region)
/property value (higher percent the higher value.)
If outside Metro Manila, agricultural and not very big, then I GUESS your total tax will be around 0,6 percent of the property value per year
= TOTAL for 5 years. 3000p per 100 000p your property is worth.
PLUS it's risk they will want some punishment fee for late pay, but some municipalies don't ask that, because they get so happy by someone come and say they want to pay tax haha (Sometimes some municipalities give amnesty for late property tax payers.)
In the FUTURE you can think of many municipalies give 10 - 20 percent of the tax DISCOUNT if you pay earlier than you need to.
"aandar na ba agad yung deadline nila to settle whats needed?"
I suppouse there are local differences. Ask them.
If you want to know in advance, you can send someone NOT family there and ask anonomous