# Why Does AWS Cost Explorer Show a Cost Increase After Commitment Purchases?

## Why Does a Commitment Purchase Show as a Big Cost Spike?

No Upfront commitment costs (GRIs, SPs or RIs) can look a bit strange in the **"Unblended Cost"** Cost Explorer view when purchased during a month that is still in progress. AWS attributes the entire cost of the reservation over the month to the day the reservations were purchased and the account that contains those reservations.

For subsequent months, similar behavior will occur where AWS attributes the entire cost of the reservation over the month to the 1st day of the month.

## Understanding Amortized Cost

As the month progresses you will see the cost of those commitments be appropriately "spread out" across the days of usage in the **"Amortized Cost"** view, ultimately resulting in a lower cost for the month as a whole.

The "Amortized Cost" view additionally attributes the costs of commitments to the accounts that are using those commitments rather than the account that contains those commitments.

## Related Resources

* [Why do I see new monthly charges from AWS Cost Explorer after installing Archera?](https://docs.archera.ai/help-center/aws-faq/cost-explorer-charges)
* [Why Not Just Use AWS Cost Explorer?](https://docs.archera.ai/help-center/aws-faq/why-not-cost-explorer)