I have built a free android app to calculate monthly installment or to recommend a car based on preferred monthly instalment. Link https://play.google.com/store/apps/details?...pps.carloancalc

I am planning to add features to calculate Road Tax and insurance for a given model. I tried a couple of searches around but couldn't find a definitive answer.

1. Formula for road tax calculation?
From what I know, road tax is dependent on the engine capacity ie. How many cc, I found the following but not sure if that is exhaustive and also the latest.

< 1,000 RM30 RM20
1001 – 1200 RM65 to RM80 RM55
1201 – 1400 RM80.10 to RM100 RM70
1401 – 1600 RM100.10 to RM127.50 RM90
1601 – 1800 RM255.35 to RM325 RM200.40 to RM280
1801 – 2000 RM325.35 to RM395 RM280.50 to RM380
2001 – 2500 RM396 to RM895 RM381 to RM880
2501 – 3000 RM897.50 to RM2145 RM882.50 to RM2130
3001 – 5000 RM2149.50 to RM11145 RM2134.50 to RM11130

2. Formula for insurance?
I totally have no idea on this, any articles recommendation is highly appreciated.

Thank you in advance for any feedback!

Thank you very much, it is pretty complicated as I feared, may variable & parameters to take account, will be focusing on road tax first then,

Again, thanks!