If I want to buy down my rate from 5% to 4% how many points is that and cost on a $423,000 loan?

Truth is right now is likely the best time ever to make that decision. Due to the stock market doing what it did yesterday rates are out of this world right now. You will need to provide some info for the questio to be answered though.what kind of loan do you have now?what is your home worth?what is your credit score? income?job history?ETC Shane McGraw, VA Loan ExpertMLO#-90072360.698.6471

A rate of 5% is above par, it does not need to be nor can it be bought down to 4%. The question is impossible to answer for that reason and so many others.

Not enough info to give you an accurate answer

In order to answer that question, we would need to know the following: Ltv, credit score, debt to income ratio, assets, appraisal, income and bank statement for last two months.

The cost (in points) will vary day to day even if interest rates remain steady. Have your loan officer prepare a quote based on your specific circumstance and the mortgage program you plan to use.