How Much Do You Need to Retire? A Step-by-Step Method

"How much do I need to retire?" has no single answer, but it has a method. You estimate what you will spend, allow for inflation, decide how long the money must last, and compare the result with what you are on track to save. This guide walks through the steps with worked numbers, so you can see the size of your own target and what moves it.

Step 1: Estimate your spending in today's money

Start with what you spend now and adjust for retirement. Some costs fall: commuting, work clothes, and possibly a mortgage. Others rise, especially health care and leisure in the first active years. Write down a monthly figure for housing, food, transport, health, insurance, leisure and family. If you would spend 3,000 a month if you retired today, use that as your starting point.

Step 2: Add inflation

Prices rise, so the spending you need at retirement will be higher than your figure today. At 3 percent inflation, 3,000 a month becomes about 7,282 a month after 30 years. Ignoring this is the most common retirement planning error: a pot that looks big in today's terms can buy much less by the time you need it.

Step 3: Decide how long the money must last

Plan for a long life. If you retire at 60 and plan to 85, you need 25 years of spending. Many people live longer, and the risk of running out is worse than the risk of leaving something behind, so consider planning to 90 or 95. Each extra year of planning raises the amount you need.

Step 4: Turn spending into a pot

The retirement pot must pay this spending, rising with inflation each year, while the unspent money earns a return. For a person retiring at 60 with 7,282 of monthly spending, planning to 85 with a 5 percent return in retirement and 3 percent inflation, the pot needed is about 17,51,066. That is almost twice 25 years of today's spending (9,00,000), because prices keep rising through 25 years of retirement and the last year costs far more than the first.

The 25x rule of thumb

A popular shortcut says you need about 25 times your yearly spending, based on withdrawing 4 percent of the pot in the first year and adjusting for inflation after that. It came from research on US markets over 30-year periods. For yearly spending of 36,000, it suggests a pot of 9,00,000.

The rule is easy to remember but it assumes a particular mix of investments, a 30-year retirement and historical US returns. If you retire earlier, live longer, invest very conservatively or live where returns and inflation differ, you may need more. Use it as a quick check, not a plan.

Step 5: Project what you will have

Add up what you have saved, what you will add each month and the return you can reasonably expect until retirement. A 30-year-old with 20,000 saved who adds 500 a month at 7 percent a year has about 7,72,315 at 60. Compared with the pot needed of 17,51,066, that leaves a shortfall of about 9,78,750.

Step 6: Close the gap

Four levers change the result, in roughly this order of power.

• Save more. Raising the monthly amount from 500 to 1,000 lifts the projection to about 13,82,301 and cuts the shortfall to about 3,68,765. Closing the whole gap needs roughly 802 extra a month.
• Start earlier. The same plan begun at 40 instead of 30 needs about 1,846 extra a month, more than double.
• Work a little longer. Retiring at 65 instead of 60 shrinks the shortfall to about 5,67,428, because the money grows longer and has to fund fewer years.
• Spend less. Planning for 2,000 a month instead of 3,000 reduces the pot needed to about 11,67,377.

Include other income

Pensions, social security, rental income or part-time earnings reduce the amount your savings must provide. If you expect 1,000 a month from a pension, plan for the remaining 2,000 of spending. Be cautious: benefit rules change, and pension values are eroded by inflation unless they rise with it.

Common mistakes

• Using today's prices for a goal 30 years away.
• Assuming a high return and low inflation at the same time.
• Planning to an age that is too low.
• Forgetting taxes, fees and one-off costs such as health care and home repairs.
• Leaving it until your fifties, when the cost of catching up is much higher.

Run your numbers

The Retirement Calculator does the projection, the inflation adjustment and the shortfall for you, and shows the extra monthly saving needed. See how regular investing builds a pot with the SIP Calculator, test growth with the Compound Interest Calculator, and see how far prices may rise with the Inflation Calculator. Turn your pay into monthly figures with the Salary Calculator. For why inflation matters so much, read how inflation erodes savings.