Having the pension plan distribution deposited directly into the HSA account would constitute a taxable distribution from the pension plan and, if you are permitted to make an HSA contribution, a deductible HSA contribution. It's probably a bad idea to do so because it would not give you direct control over the amount that you would be contributing to the HSA, so you could end up making an excess contribution that is subject to penalty. In all likelihood the amount deposited this way would exceed the amount that you are eligible to contribute to the HSA, so you would have to repeatedly change the account to which the pension payments are deposited. It would be far safer to have the pension paid to you and that you separately make an HSA contribution. To make a contribution to an HSA you must have qualifying HDHP coverage and no disqualifying coverage like Medicare.
