The KiwiSaver scheme, a New Zealand savings scheme, came into operation from Monday, 2 July 2007. Participants can normally access their KiwiSaver funds only after the age of 65, but can also use them as a deposit for a first home.

A policy initiative of the Fifth Labour Government of New Zealand (in office 1999-2008), KiwiSaver is governed by various Acts of Parliament, including the KiwiSaver Act 2006 (passed in September 2006).

Some people have criticised KiwiSaver for high fees going to Australian banks and for government subsidies going to wealthiest income-earners in New Zealand. Some people have critiqued KiwiSaver as an alleged part of a strategy to reduce New Zealand Universal Superannuation provision and to expand New Zealanders' reliance on private financial institutions to fund retirement income.

Anyone aged 64 and under, who is entitled to live in New Zealand indefinitely and who normally lives in New Zealand, is entitled to join KiwiSaver. Those under 18 require parental consent to join.

Employee participants can choose to contribute 3%,^[1] 4%, 6%, 8% or 10% of their gross pay, and can switch rates three months after setting a rate (unless employers agree to a shorter time frame). These contributions are deducted from an employee's pay, and sent by the employer to Inland Revenue alongside their PAYE tax returns. The self-employed and unemployed can choose how much they want to contribute; while most KiwiSaver schemes have minimum contribution amounts for people in this category, several schemes allow any level of contributions.^[2][3] All eligible participants aged 18 to 64 starting a new job, with some exceptions, are automatically enrolled in KiwiSaver. New employees can choose to opt out from day 14 to day 56 of their employment.^[4]

Participants choose to put their savings in one of several "approved savings schemes". They can only belong to one scheme at a time, but can change schemes at any time. If they do not choose a scheme, and the participant is aged 18 or over, they will be assigned either to the employer's default scheme or to a government-selected default scheme. Each scheme offers several managed funds to invest the participants' savings in, with varying degrees of expected risk and return.

Employers are required to contribute at least 3% of an employee's gross pay to the employee's KiwiSaver account. The employer contribution is taxed at the employee's marginal tax rate, so the actual amount the employee receives in their account is between 2.01% and 2.685%.

From the start of the scheme until May 2015, those who joined KiwiSaver received a $1,000 tax-free "kick start" to their KiwiSaver account from the government. The Fifth National Government removed it effective 21 May 2015 as part of its 2015 budget.^[5] Those aged 18 and over also receive from the government a "member tax credit" (MTC) of 50 cents per dollar contributed (or part thereof) for the first $1,042.86 contributed per year (1 July to 30 June). The MTC is not a true tax credit; it is a monetary contribution paid by the government via Inland Revenue, mainly to offset the tax paid on interest earned. Those withdrawing KiwiSaver funds to help buy a first home may also get a deposit subsidy of up to $5,000 (existing homes) or $10,000 (new builds) from Housing New Zealand, provided they meet the required income, deposit and house price requirements.

A participant can access all their KiwiSaver contributions once they reach the age of entitlement for New Zealand Superannuation (currently 65), as long as they have been a KiwiSaver member for five years. Otherwise, KiwiSaver contributions can only be accessed (with restrictions) in the following circumstances:

Some provider funds offer a mortgage diversion scheme where some of the employee contributions can be used to make mortgage repayments instead of going towards Kiwisaver, after a person has been signed up for 12 months. This is only allowed for repayments on the main home, and not for other properties such as investment or holiday homes. Employer contributions will not be able to be used for the mortgage.

This option was abolished by the National Government that came into power in 2008, though employees who used this option prior to June 2009 can continue to use it as long as their provider offers it.

Persons on the scheme can take contribution holidays after 12 months for any period from 3 months to 5 years without any limits on future contribution holidays.

People aged under 18 may join KiwiSaver if the provider allows their enrolment. If not employed, the child has to agree to a level of contributions with the provider. As soon as the child is employed they must contribute and can never opt out.^[6] Children are not entitled to the tax credits.^[7]

As of 30 June 2013, there were 352,600 KiwiSaver members aged under eighteen.^[8]

Each scheme offers several managed funds to invest the participants' KiwiSaver savings in, and members may invest parts of their savings in different funds. Each managed fund has different risks, returns, investment composition and fees.

Inland Revenue and the Commission for Financial Literacy and Retirement Income both divide funds into five broad categories, based on their investment composition:^[9][10]

Some providers offer a "lifetime" fund option, which sees the member's savings move to more defensive funds as the member ages. An example may have members aged under 35 in an aggressive fund, those aged 35 to 49 in a growth fund, those aged 50 to 59 in a balanced fund, those aged 60 to 64 in a conservative fund, and those aged 65 and over in a defensive fund.

There have been concerns raised that members are not easily able to choose ethical investing due to a lack of information about the makeup of funds.^[11] In particular, investments which include profits the production of cluster munitions, landmines, and nuclear weapons have been highlighted as being illegal in New Zealand.^[12][13]

There are however now at least five funds aimed specifically at these concerns,^[14] describing themselves as variously as "socially responsible",^[15] "The ethical KiwiSaver scheme for Christians",^[16] or expressly excluding "companies involved in cluster bombs, landmines, tobacco, gambling and pornography".^[17]

As the main purpose of the KiwiSaver fund is for retirement savings, money can be withdrawn from the fund at the age at which the person is eligible for government superannuation, currently 65, as long as they have been a KiwiSaver member for five years.

However, money can be withdrawn before retirement in a number of circumstances which are outlined in Schedule 1 (KiwiSaver scheme rules), of the KiwiSaver Act 2006.

If a New Zealander permanently emigrates to Australia, they may choose to keep their KiwiSaver savings in New Zealand or transfer them to a complying Australian superannuation fund. Likewise, if an Australian permanently emigrates to New Zealand, they may choose to keep the Australian superannuation savings in Australia or transfer them to a complying KiwiSaver fund. Regardless of where the money is held, Australian superannuation savings can be withdrawn once the person turns 60 and retires from working, or turns 65 regardless of employment status. Australian savings cannot be withdrawn to help buy a first home.

KiwiSaver contributors meeting certain criteria can apply for a cash grant to purchase their first home or a piece of land. This grant is for individuals earning less than $85,000 per year or two or more individuals earning $130,000 per year in total. This grant is in addition to the withdrawing savings option.^[19]

The KiwiSaver scheme was one of the promises on Prime Minister Helen Clark's controversial 2005 pledge card as part of the Labour Party's promises for that election. In 2008 John Key, then Leader of the Opposition, stated that a National led government would mean "there won't be radical changes...there will be some modest changes to KiwiSaver".^[20] KiwiSaver therefore has broad political support, being supported by both the National and Labour parties.

Additionally, fee subsidy for those people who become members after 1 April 2009, has been removed and for those people who joined before 1 April 2009 only 1 or 2 years fee subsidy will be paid (depending upon the date the member joined).

On 16 July 2009, the governments of New Zealand and Australia announced plans^[21] to allow funds in KiwiSaver and Australian superannuation to be transferred between the two schemes. This would allow New Zealanders who have worked in Australia to repatriate their superannuation money to New Zealand, and likewise for Australians who have worked in New Zealand to repatriate their KiwiSaver money to Australia. Trans-Tasman portability of retirement savings came into force on 1 July 2013; from that date New Zealanders could no longer withdraw their KiwiSaver funds in cash on the basis of permanent emigration to Australia.

In 2013 Labour said it would like to make the KiwiSaver scheme universal, in the face of the rising cost of superannuation,^[22] while financial organisations called for raising the minimum contributions to 7 percent.^[23]

As part of the 2015 New Zealand budget, the National led Government repealed the $1,000 "kick-start" payment.^[5] Following the presentation of the budget, Finance Minister Bill English indicated the government was considering "mass auto-enrolment" of all workers under the age of 65.^[24]

KiwiSaver has been critiqued as being a part of a strategy to reduce New Zealand Universal Superannuation provision and expand New Zealanders' reliance on private financial institutions to fund retirement income,^[25] and can be seen as part of the wider global strategy of pension privatisation originally promoted by the World Bank and others.^[26] Winston Peters has critiqued KiwiSaver as a 'billion dollar rort' by the finance industry and proposed alternatively that private KiwiSaver funds should be invested in a government run "KiwiFund" which would invest mainly in New Zealand assets and infrastructure.^[27] Russel Norman of the Green Party has earlier proposed directing KiwiSaver funds into the New Zealand Superannuation Fund (also known as the "Cullen Fund") to reduce high fees paid to financial industry.^[28][29]

It was announced on 30 August 2007 that nearly 130,000 New Zealanders had signed up for the scheme.^[30][31]

In October 2007, after 3 months of operation, 200,000 people had signed up, leading Revenue Minister Peter Dunne to say that

However he said that these were his personal views and not those of the government.^[32]

On 6 December 2007, 5 months after the start of KiwiSaver, it was announced that 316,000 people had signed up. Over half were under 45, nearly 20% were under 25, and 33,000 were under 20.^[33] By 31 May 2008 uptake had more than doubled to 673,000, with more than $900 million having been paid into KiwiSaver schemes.^[34]

As a comparison, the cost of New Zealand Superannuation for 2014/15 is $11,589 million.^[39]