Mayday will monitor your accounting files and notify you if any late transactions come through.
We will notify you in-app if any transaction(s) have changed which would mean your recharges would be different if you ran them today
All you have to do is go to that month's calculation, and recalculate the recharges using the recalculate button in the top right corner of the postings screen
Then you can one-click update the relevant postings in your accounting file from within Mayday.
For more information see this helpful article which also explains what to do if you need to recalculate after marking as final.