When a monthly withdrawal runs out early

Why a withdrawal feels safe until it is not

You have a pile of savings and a monthly amount you plan to take out. On paper, the return covers the withdrawal and the balance stays steady. It feels like a salary you built yourself.

Then the return comes in lower than the plan. Or it comes in unevenly: two weak years at the start, then good ones. The balance falls faster than you expected. By the time you notice, there is less money left to grow, and the same withdrawal now takes a bigger bite.

This is the central problem of a systematic withdrawal plan, usually shortened to SWP. You are not saving any more. You are spending down. In saving, a bad year hurts a little because you keep adding. In withdrawing, a bad year hurts a lot, because you keep subtracting from a smaller base.

Three forces decide how long the money lasts:

• The withdrawal rate. The yearly withdrawal divided by the starting balance.
• The return. What the money earns while it waits to be withdrawn.
• The order of returns. Whether good years or bad years arrive first.

A fourth force sits quietly behind them: inflation, which makes you raise the withdrawal over time.

The SWP calculator lets you enter the lump sum, the monthly withdrawal and a return, and see the balance year by year. The guide on how long a withdrawal lasts lists each input. The SWP answers page covers the usual questions. This article shows how to read the result, and how to stress it.

The withdrawal rate: the first number to check

The withdrawal rate is the simplest warning light. Divide a year of withdrawals by the starting balance.

Withdrawal rate = (monthly withdrawal × 12) ÷ starting balance

For ₹50,00,000 and ₹40,000 a month, the rate is ₹4,80,000 ÷ ₹50,00,000 = 9.6%. That is high. The money must earn about 9.6% a year just to stay level, and the plan has no room for a bad year.

Here are the rates for the same ₹50,00,000 at different withdrawals.

• ₹16,700 a month: 4.0% a year.
• ₹25,000 a month: 6.0% a year.
• ₹33,300 a month: 8.0% a year.
• ₹40,000 a month: 9.6% a year.

Many planners use about 4% as a starting point for a long retirement. That figure comes from studies of past market returns, mainly in the United States, and it is a rule of thumb, not a guarantee. Where inflation and interest rates are higher, or where retirement can last 30 years or more, a lower figure is safer. Where you have other income, such as a pension or rental income, a higher figure may work for a time.

A simple use of the rate is as a filter. Above 6%, the plan needs good returns and has little margin. Above 8%, it needs high returns and a short horizon. Treat these as flags to investigate, not as laws.

How long it lasts at different returns

The next step is to see how long a given withdrawal lasts at several returns. Use the same ₹50,00,000 and ₹40,000 a month, withdrawn at each month end after the month's growth.

• 10% a year: the monthly growth is about ₹41,700, which is more than the withdrawal. The balance does not fall. The plan lasts for as long as the return holds.
• 8% a year: the money lasts about 270 months, or 22.5 years.
• 6% a year: about 197 months, or 16.4 years.
• 4% a year: about 162 months, or 13.5 years.
• 0% a year: 125 months, or 10.4 years. This is simply ₹50,00,000 ÷ ₹40,000.

One change in the return turns "forever" into "ten years". That is how sensitive a high withdrawal rate is. A 2-point drop from 10% to 8% takes the plan from endless to about two decades. A 2-point drop from 8% to 6% takes about six years off.

Run the same test on your own plan. If the answer at your cautious rate is shorter than the time you need, you have found the problem while it can still be fixed.

The order of returns matters

Two investors can earn the same average return and end up in very different places, if they are withdrawing. The reason is the order of the good and bad years.

Take ₹50,00,000 with ₹4,00,000 withdrawn at the end of each year. Use the same four annual returns in two different orders. They are +15%, +15%, −5% and −5%, and they average 5%.

• Path A: good years first. After year 1: ₹53.5 lakh. After year 2: ₹57.5 lakh. After year 3: ₹50.6 lakh. After year 4: ₹44.1 lakh.
• Path B: bad years first. After year 1: ₹43.5 lakh. After year 2: ₹37.3 lakh. After year 3: ₹38.9 lakh. After year 4: ₹40.8 lakh.

The set of returns is identical. The withdrawals are identical. Path B ends about ₹3.4 lakh lower, and it starts the next stage from a smaller base, so the gap will keep growing.

Without withdrawals the order would not matter. Both paths would end at the same value. The withdrawals are what make the early bad years so costly. You sell units at low prices to fund the payment, and those units are no longer there when prices recover.

This is called sequence risk. You cannot predict it. You can only plan for it by keeping the withdrawal modest, holding a cash reserve for the first few years, and being willing to reduce spending after a poor year.

Your withdrawal will probably need to rise

Most withdrawal calculations use a fixed monthly amount. Real life does not stay fixed. Prices rise, and a payment that covered your costs in year one will cover less in year ten.

At 6% inflation, a ₹30,000 monthly need today becomes about ₹53,700 in 10 years and about ₹96,200 in 20 years. If the plan keeps the amount at ₹30,000, your standard of living falls each year. If the plan raises it, the balance falls faster.

Look at the effect on duration. Take ₹60,00,000 with a first-year withdrawal of ₹30,000 a month, rising by 6% a year. If the money earns 8%, an annual approximation shows it lasts about 21 to 22 years. With a flat ₹30,000 at the same 8%, the balance would grow for decades. The raise is the difference between a plan that never ends and one that runs dry in the second decade.

Use the inflation impact calculator to see what your spending becomes at a given rate and number of years. Then put the higher figures into the SWP plan, or use a step-up if the tool supports it.

For a fuller view of the same issue, see how much your retirement savings will be worth after inflation. It explains why a number that looks large today can feel smaller at the date you need it.

What monthly amount fits a fixed horizon?

You can also turn the question around. Given a lump sum and a time span, what is the largest monthly withdrawal that lasts exactly that long?

Take ₹60,00,000 and 25 years (300 months). The withdrawal that empties the balance at the end, at each return, is:

• 8% a year: about ₹46,300 a month.
• 6% a year: about ₹38,660 a month.
• 4% a year: about ₹31,660 a month.
• 0% a year: ₹20,000 a month.

The spread is large. The best case allows more than double the zero-return case. If you plan on the best case and get the worst, you run out after about 11 years instead of 25.

A prudent way to use this table is to pick the amount for a cautious rate, say 4% or 5%, and treat anything extra as a bonus. If the actual return is higher, the balance will be there at the end, or you can raise the withdrawal later with a clear picture.

Every number in this section is arithmetic from assumptions. It is not a promise of income from any product. The calculator shows what the assumptions imply. It cannot tell you what markets will do.

Ways to make a withdrawal last longer

If the stress test shows the plan is short, there are practical levers. None requires luck.

1. Withdraw less. The simplest change. A 10% cut in the monthly amount can add years, especially at lower returns.
2. Add another income. A pension, part-time work, rent or an annuity. Even ₹5,000 a month from another source reduces the draw on the pile.
3. Delay the start. Waiting a year or two lets the balance grow and shortens the time it must last. The savings calculator helps you see how much more you can add.
4. Keep a cash reserve. Hold one to two years of withdrawals in a safe place. In a bad year, draw from the reserve and leave the invested part alone.
5. Be flexible. Skip the inflation raise after a weak year. Reduce spending on travel or gifts for a season.
6. Review once a year. Compare the actual balance with the plan. If you are below the line, adjust early and in small steps.
7. Mind the tax. Withdrawals from some products are partly principal and partly gain, and the tax can differ. Check the rules in your country before you set the amount.

Combine two or three of these. A plan with a modest rate, a small side income and a cash reserve can survive conditions that would break a plan based on a single hopeful return.

A simple bucket approach

Some people split the pot into buckets by time. It is a way to put sequence risk into practice.

• Bucket 1: next 1 to 2 years of withdrawals. Held in safe, easy-to-reach products. Refilled once a year.
• Bucket 2: years 3 to 7. Held in lower-risk products such as short-term debt funds or deposits.
• Bucket 3: years 8 and beyond. Held in growth assets, which have time to recover from falls.

Each year, move money from a growth bucket to refill the safe one, but only after a good year. After a poor year, leave Bucket 3 alone and use Bucket 1 for another year.

This method does not raise returns. It only reduces the chance that you will be forced to sell growth assets at a low price. The cost is that part of the money earns less. Whether that trade suits you depends on how you feel about swings, and on how long the plan has to run.

Worked example from start to finish

Meena is 60. She has ₹60,00,000 and wants ₹35,000 a month. She is told "it is only 7% a year, the money will earn that easily".

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