Either way, some underwriters will require proof that you have enough funds in the bank to pay for 30 days of prepaid interest, so make sure you are prepared for a worst-case scenario. Now let's say your mortgage closed in January. Your first mortgage payment will be on March 1st, at which time that money will be applied to the interest accrued during February. Your April 1st payment will go toward March's interest, and so on. With an understanding of how a mortgage payment works, you can easily determine when your first mortgage payment is due.
Most conforming loans have a due date of the first of each month.
If you close in November, then your first payment is not due until January 1st.