"All your member tax credits must be repaid to Inland Revenue, and any amounts transferred to your KiwiSaver from an Australian complying superannuation scheme cannot be withdrawn."
This leaves you your contributions, your employer contributions and the $1000 kick-start, if you were eligible.
Jackson says you will be asked to provide evidence to support your permanent emigration withdrawal request.
This could include copies of pages from your passport, plane tickets, utility bills, bank statements or rental agreements, all witnessed and signed by a lawyer, JP or similarly qualified person.
You will also need that person to witness the signing of a statutory declaration on the withdrawal form from your KiwiSaver provider.
What are the tax implications?
"When you make a withdrawal from your KiwiSaver account there will generally be a deduction for any PIE tax owing," says Jackson.
"We recommend you seek UK tax advice regarding your KiwiSaver investment, including whether a permanent emigration withdrawal will mean you'll need to pay UK tax on that money once you receive it."
Having closed your KiwiSaver account, you can rejoin if you return to New Zealand, provided you meet the eligibility criteria.
It's also worth noting you won't have received the member tax credit while you have been living overseas, even if you have made voluntary contributions from the UK.