The UAE generally doesn't impose personal income tax, and life insurance payouts to beneficiaries are typically not subject to UAE tax at the point of payout. That said, tax treatment can still depend on where the beneficiary is tax resident, since some other countries do tax life insurance proceeds received by their own tax residents regardless of where the policy was issued, so beneficiaries living outside the UAE should check their own country's specific tax rules rather than assuming the UAE's tax treatment automatically applies to them.
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