The 4 payments are 2019 Estimated tax forms....they are for next year's taxes, not the 2018 stuff you are filing now...so you still have to pay VA your full balance due some way.
The estimated tax forms are there in case you find you will be in an underpayment situation next year too, and since they are based on this year, may not actually be accurate….thus the word "Estimated" .
They can be used if you think they will limit your underpayment next year...or ignored if you will be making other changes in your tax withholding to not get in an underpayment situation next year.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
