SWP Explained: Withdrawals, Returns and Remaining Corpus

Understand how the SWP calculator models monthly withdrawals, an entered return and the remaining corpus.

Published: Published 22 Aug 2026
Updated: Updated 22 Aug 2026
Reading time: 7 min read

This article is for education and general information. See the Financial Disclaimer before using it for an important decision.

An SWP projection models withdrawals from an existing corpus

A Systematic Withdrawal Plan (SWP) projection starts with an existing corpus, applies the entered annual return each month, and then deducts the requested monthly withdrawal. It shows what happens under those assumptions; it does not decide how much anyone should withdraw.

Enter the assumptions in the SWP Calculator.

The calculator uses four inputs

The model converts the annual return to a monthly rate, applies that return before each monthly withdrawal, and stops processing when the corpus reaches zero.

Starting corpus or initial investment
Monthly withdrawal
Entered annual return assumption
Whole-year withdrawal period

Engine-derived example: ₹10,00,000 corpus and ₹10,000 monthly withdrawal

At an illustrative entered return of 8% for 10 years, the engine reports ₹12,00,000.00 withdrawn across 120 months and ₹3,90,179.88 remaining. Exhaustion before the tenure is No.

Engine-derived SWP projection
Total withdrawn	Remaining corpus	Months with withdrawal	Exhausted before tenure
₹12,00,000.00	₹3,90,179.88	120	No

Read withdrawals and remaining corpus together

A larger withdrawal reduces the corpus faster, while the entered return can offset part of that reduction in this simplified projection. Total withdrawn is the amount actually withdrawn by the loop, not a promise that the requested amount will be available for every month.

The SWP Calculation guide explains the timing, and Why SWP Corpus Can Run Out covers exhaustion.

This is not a forecast or withdrawal recommendation

The engine uses one constant entered return and does not simulate changing monthly returns, sequence of returns, fees, taxes, inflation-linked withdrawals, missed payments or product-specific rules. Actual outcomes can differ materially. It does not calculate a safe withdrawal rate or retirement suitability.

Frequently asked questions

Does the SWP calculator guarantee that the corpus will last?

No. It projects the result under the entered constant return and withdrawal assumptions; it is not a guarantee or recommendation.

Does the calculator model changing market returns?

No. It converts one entered annual return into one constant monthly return.

Are fees and taxes included?

No. Fees, taxes and capital-gains treatment are outside the existing SWP engine.

investments

How SWP Is Calculated: Return Timing, Withdrawals and Balance

Trace the SWP calculator's monthly return conversion, return-before-withdrawal order and balance updates.