How Is Prorate Calculated
VNIS implements prorated pricing calculations for plan upgrades to ensure accurate billing without overpayment. Refunds are processed as credit notes when applicable.
Proration Example
Consider a Developer plan account (USD 0/month) with China DNS add-ons (USD 100/month) purchased September 1st. Plan upgrade to Business plan (USD 500/month) occurs September 14th, with 210k China DNS queries incurred during September 1-14.
Current Plan Calculation
The system calculates per-day charges for the current plan tier before upgrade processing:
-
Day accounting:
Days finished within the month: 14 days
Days remaining before end of the month: 30 - 14 = 16 days -
Developer Plan:
Developer plan cost: USD 0.00 / month
Per day cost: USD 0.00 / 30 days = 0.00 / day
USD 0.00 / day * 14 days = USD 0.00 (used) -
China DNS:
China DNS cost: USD 100 / month
Per day cost: USD 100.00 / 30 days = USD 3.33 / day
USD 3.33 / day * 14 days = USD 46.62 (used)
USD 100.00 - USD 46.62 = USD 53.38 (for refund) -
China DNS queries:
China DNS queries cost (for developer plan):
0-10k: USD 0.00 (FREE)
10k-100m: USD 30.00 per mil
Free China DNS queries: 10k * 14 days / 30 days = 4.67k (free requests used)
(210k - 4.67k) * USD 30.00 / 1 mil = USD 6.16 (used)
Refund (for Developer plan): USD 0.00 + USD 53.38 - USD 6.16 = USD 47.22 (in the form of free credit)
Upgraded Plan Calculation
The system calculates per-day charges for the new plan tier after upgrade processing:
-
Business Plan:
Business plan cost: USD 500.00 / month
Per day cost: USD 500.00 / 30 days = 16.67 / day
USD 16.67 / day * 16 days = USD 266.67 (to be paid) -
China DNS:
China DNS cost: USD 0.00 / month
Per day cost: USD 0.00 / 30 days = USD 0.00 / day
USD 0.00 / day * 16 days = USD 0.00 (for refund) -
China DNS queries:
China DNS queries cost (for developer plan):
0-100k: USD 0.00 (FREE)
100k-100m: USD 30.00 per mil
Free China DNS queries: 100k * 16 days / 30 days = 53.33k (free to use)
Charge (for Business plan): USD 266.67 - USD 0.00 = USD 266.67
Proration Summary
The upgrade results in a USD 47.22 refund credit and USD 266.67 charge, with 53.33k free China DNS queries available for use.
Net Payment: USD 219.45 (includes 53.33k free China DNS queries)