No. An estimated personal tax saving is not an official reduction of the required payment. Follow the actual government instructions.
Separate cash required from a conditional financial estimate
Current individual terms include US$15,000 nonrefundable processing and the US$1 million gift after vetting. Do not subtract an unverified rebate or present a private net-cost forecast as the official price. This page makes no promise that any tax benefit is available.
Anyone comparing the two should hold that difference in front of them throughout, because a great deal of loose commentary describes the payment as an investment and some of it goes further and describes the arrangement as something the government provides. Prepare a staged budget that separates the non-refundable processing fee, the published gift payment, any spouse or child amount, professional assistance, travel, and ordinary settlement costs. Everything else — translators, counsel, medical examinations, courier and travel — is private commercial spending negotiated with a provider, and none of it is an official programme charge however an invoice describes it.