Safe Withdrawal Rate Calculator NZ

This calculator works out the sustainable income you could draw from a retirement pot in New Zealand using a safe withdrawal rate, the best known of which is the four percent rule. The idea, drawn from decades of market history, is that if you withdraw around four percent of your savings in the first year of retirement and then adjust the dollar amount for inflation each year, your pot has a good chance of lasting roughly thirty years, surviving the ups and downs of markets along the way. It is one of the most useful rules of thumb in retirement planning because it turns a savings balance into a spending figure you can actually live on. You enter your retirement pot and the withdrawal rate you want to use, and the calculator shows the sustainable income per year, per month and per week. Use it to see what income your savings can realistically support, or to work backwards to the pot you need for a target income. The four percent rule is a guide, not a guarantee: it comes from United States data, some prefer a slightly lower rate for caution, and poor returns early in retirement, known as sequence risk, can still strain a pot. Most New Zealanders also have NZ Super on top, easing the load on savings. General information, not financial advice.

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$
%
$32,000
sustainable income a year
Per month$2,667
Per week$615

A guideline, not a guarantee; some prefer a lower rate for caution. NZ Super provides income on top. Watch sequence-of-returns risk early in retirement. General information only.

How it works

The sustainable annual income is your retirement pot times the safe withdrawal rate. Dividing by 12 gives the monthly figure and by 52 the weekly figure. To find the pot needed for a target income instead, divide the income by the withdrawal rate, so at 4 percent the pot is 25 times the income.

Worked example

An 800,000 dollar pot at a 4 percent safe withdrawal rate supports about 32,000 dollars a year, which is roughly 2,667 dollars a month or 615 dollars a week, before any NZ Super on top.

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Frequently asked questions

What is the 4% rule?

The 4 percent rule is a guideline that you can withdraw about 4 percent of your retirement pot in the first year, then adjust for inflation, and have a good chance of the money lasting around 30 years. It is a starting point, not a guarantee.

Is 4% safe for New Zealand?

The rule comes from historical United States data, and some argue a slightly lower rate is prudent given fees, taxes and uncertainty. Many retirees also have NZ Super on top, which reduces how hard their savings must work. Treat 4 percent as a guide.

What is sequence-of-returns risk?

It is the danger of poor market returns early in retirement, which combined with withdrawals can deplete a pot faster than the average return suggests. Holding some cash and staying flexible with spending helps manage it.