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The due date for making an invoice payment, including final invoice payments, is indeed the later of 30 days after receipt of the invoice or government acceptance of services. This standard ensures that the government agency has sufficient time not only to receive and process the invoice but also to confirm that the services rendered meet the required specifications and are acceptable. The combination of these two time frames ensures the contractor is paid promptly once the quality and standards are met.

Incorporating both elements helps protect the interests of both parties; it accommodates possible delays in processing or validation while also laying down clear expectations for payment timelines post-acceptance. This is crucial in maintaining a fair and transparent contractual relationship.

The other options tend to oversimplify the invoicing process. For instance, solely tying payment to 30 days post-invoice receipt does not account for the necessary acceptance phase, which can lead to potential disputes regarding payment if services are not adequately fulfilled. Similarly, linking payment strictly to government acceptance or completion of contractor work without considering the receipt of the invoice does not accurately reflect the process stipulated in most contracting practices. For clarity and fairness, the combination provided in the correct answer is the most comprehensive and equitable approach for handling invoice payments.