# Amending your future dated agreements
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You can increase your purchased units of a particular dimension in your FDA after the agreement start date. This option is possible when the agreement doesn't have a flexible payment schedule. For more details, see [Flexible payment scheduler](https://docs.aws.amazon.com/marketplace/latest/userguide/flexible-payment-scheduler.html).

You will be charged the pro-rated amount on the agreement start date when your amendment is complete. If your start date is in the past, you'll be charged immediately.