Accumulation of Vacation Leave

Hi I currently used PTO_PAYROLL_CALCULATION fast formula for vacation leave in absence management. But here's the scenario:

1.25 Days in the Vacation Leave Balance accumulated every end day of the month (MM - "30 or 31" - YY) based on what configured on the fast formula, As per requested, we want Vacation Leave accumulated every first day of the month (MM-01-YY).

Sample Output:

January 31, 2021 = 1.25

February 28, 2021 = 2.5

March 31, 2021 = 3.75

April 30, 2021 = 5

May 31, 2021 = 6.25

etc..

Desired Output:

February 01, 2021 = 1.25

March 01, 2021 = 2.5

April 01, 2021 = 3.75

May 01, 2021 = 5

June 01, 2021 = 6.25

*As you notice in the sample output Vacation Leave Accumulated every end day of month earned 1.25