How Long Will an SWP Last?
There is no single withdrawal amount that will last for every investor. The projected duration depends on the starting corpus, withdrawal amount, return assumption, withdrawal increases and time horizon.
An SWP model is best viewed as a way to test relationships between assumptions. It can answer questions such as “What changes if I withdraw ₹10,000 instead of ₹15,000?” without claiming to know the exact future path of an investment.
The main drivers
- Starting corpus: a larger starting balance gives the plan more capital to draw from.
- Withdrawal rate: taking more each month generally puts greater pressure on the corpus.
- Return assumption: a higher assumed return can increase the projection, but actual returns fluctuate.
- Withdrawal increases: increasing withdrawals can shorten the projected duration.
- Time: longer horizons expose the plan to more periods of withdrawals and market variation.
Why withdrawal rate matters
Two people can start with the same corpus but receive very different projections if their monthly withdrawals differ. A withdrawal that is small relative to the starting balance leaves more capital invested, while a larger withdrawal consumes the corpus more quickly.
Why returns should be tested as scenarios
A constant return assumption makes a calculator easier to understand, but actual markets can have positive and negative periods. Testing several assumptions can show how sensitive the projected duration is to the return input.
Use scenarios instead of one prediction
Try a conservative return, a higher return and different withdrawal amounts. You can also compare a fixed withdrawal with an annual step-up. The comparison is more informative than treating a single projected number as a promise about the future.
When the corpus is projected to run out
An exhaustion point in a calculator means the selected mathematical assumptions produce a zero balance within the model. It does not predict the exact date an actual investment will run out, because real investment returns are not constant and actual costs and taxes can differ.
A practical way to stress-test a plan
- Start with your current corpus and withdrawal requirement.
- Run the base assumptions.
- Reduce the return assumption and compare the result.
- Increase the withdrawal amount or annual step-up and compare again.
- Look at the differences between scenarios instead of focusing only on the most optimistic result.
Test how long your SWP could last →
Educational note: This guide is for general information and is not investment, tax or financial advice.