The formulas are
- Settlement of the existing plan = Total amount of the existing plan – Total amount of the existing plan/30 days* (how many) days you used
- Amount for additional licenses = Total amount of the new plan – Settlement of the existing plan
To make the math easier, we will just use $10 per month and $90 per year as an example.
For monthly subscription,
- On Nov 3rd 2020, you purchase 10 licenses of PhantomPDF Business Monthly. Total amount of the existing plan is $100. Your monthly billing date is Nov 3rd
- On Nov 10th 2020, you purchase 3 more licenses.
- On Nov 10th 2020, your new plan is 13 licenses of PhantomPDF Business Monthly, total amount of this new plan is $130. Your monthly billing date changes to Nov 10th
- For the existing plan, settlement of the existing plan is $100- ($100/30 days*7 days used) = $76.67.
- For the new plan, the amount for 3 more licenses you should pay is $130 - $76.67=$53.33.
Plan |
Order Date |
# of Licenses |
Product Name |
Unit Price with Tax |
Total Amount with Tax |
Existing plan |
11/03/2020 |
10 |
PhantomPDF Business Monthly |
$10 |
$100 |
New plan |
11/10/2020 |
13 |
PhantomPDF Business Monthly |
$10 |
$130 |
For yearly subscription,
- On Nov 3rd 2020, you purchase 10 licenses of PhantomPDF Business Yearly. Total amount of the existing plan is $900. Your yearly billing date is Nov 3rd
- On Nov 10th 2020, you purchased 3 more licenses.
- On Nov 10th 2020, your new plan is 13 licenses of PhantomPDF Business Yearly. Total amount of the new plan is $1,170. Your yearly billing date changes to Nov 10th
- For the existing plan, settlement of the existing plan is $900 – ($900/365 days*7 days used) = $882.74.
- For the new plan, the amount for 3 more licenses you should pay is $1,170 - $882.74=$287.26.
Plan |
Order Date |
# of Licenses |
Product Name |
Unit Price with Tax |
Total Amount with Tax |
Existing plan |
11/03/2020 |
10 |
PhantomPDF Business Yearly |
$90 |
$900 |
New plan |
11/10/2020 |
13 |
PhantomPDF Business Yearly |
$90 |
$1,170 |
Note: The actual payment amount will fluctuate as it will be automatically calculated by stripe according to the actual supplement or exchange rate change.