Tax residency changes the whole picture. A foreign resident (someone living permanently overseas) is taxed on the foreign-resident scale: no tax-free threshold (taxed from the first dollar at 30%), no Medicare levy, and no low-income or seniors offsets.
Source and the Age Pension
A non-resident is taxed only on Australian-sourced income. So an Australian defined-benefit pension or rent is taxed here, but foreign-sourced income — a foreign pension, or your overseas share portfolio — generally falls outside Australian tax. And the Age Pension usually can't be newly claimed from abroad, and existing entitlements are pro-rated after 26 weeks overseas, so the planner treats it as unavailable by default.
Turn this on in the wizard's Assumptions step ('Tax residency'). Non-resident tax is genuinely complex — source rules and tax treaties vary — so it's an estimate. Most people should leave it on 'Resident'.