Myth of 9.1% assured return in Assured Annual Income Plan

The Math Behind "9.1% Assured Return": A Framework for Reading Insurance-Linked Investment Illustrations

Here's a sentence that should trigger scrutiny, not excitement: "9.1% assured return for 20 years." When I first saw a number like this attached to an insurance-cum-investment product, my instinct wasn't to jump — it was to open a spreadsheet. That instinct is the entire subject of this post.

The framework I want to walk through isn't about any single product. It's about a structural pattern in how "assured return" figures get presented, and the math I personally run every time I see one — using a real, publicly available illustration as the worked example.

The Case Study: Reading the Fine Print Behind the Headline Number

As a mathematical illustration, I pulled the numbers for a plan publicly marketed at a 9.1% assured return — the Kotak Assured Annual Income Plan, using the calculation methodology published on the insurer's own site. I'm using this as a case study purely because it's a clean, real-world example of a pattern that shows up across many insurance-linked savings products, not as commentary on this insurer or plan specifically.

The first thing my framework asks is: over what base, and over what period, is this percentage actually calculated? In this illustration, the headline figure assumes a payout structure that only fully materializes after a 10-year premium-paying term, with income beginning later. When I laid out the full cash flow — premiums out for 10 years, guaranteed income in for the following 10, plus a terminal payout at year 20 — and solved for the IRR on that complete stream, the effective annualized return on capital worked out to under 3%. That's not just below the headline figure; it's below what a plain savings account was paying at the time.

That gap between the headline number and the cash-flow-derived number is, in my experience, the single most important thing to check before any allocation decision involving an "assured return" product.

The Comparison Framework: Isolating the Insurance Cost

The second layer of my framework was building a like-for-like comparison: what would it take, using a plain vanilla deposit, to replicate the same guaranteed payout schedule as the insurance plan — while separately buying pure term insurance to match the life cover component?

The calculation I ran (attached below as a worked spreadsheet) backed into the deposit interest rate needed to match the plan's guaranteed outcomes, after accounting for:

• The cost of a standalone term insurance policy for the equivalent cover
• Income tax on the deposit's interest income
• The same annuity and final guaranteed payout structure as the illustration

Update: In a later pass on this same model, I re-ran the numbers using a 30% tax bracket instead of my original 10% assumption, specifically to stress-test the worst-case scenario for the deposit alternative.

Even under that worst-case tax assumption, the deposit rate required to match the plan's guaranteed return came out to under 4% — nowhere near the 9.1% headline figure, and well within range of ordinary deposit rates available at the time. That's the core insight this entire exercise produces: the "assured return" figure and the actual annualized return on your capital can be two very different numbers, and the gap is often explained by how insurance costs and time-value-of-money are folded into the illustration.

What This Framework Generalizes To

This isn't a verdict on any specific plan, insurer, or product category — it's a repeatable checklist I now apply anytime "assured," "guaranteed," or a headline percentage is attached to a product that bundles insurance and investment:

1. Rebuild the actual cash flow timeline, not the marketing summary
2. Separate the insurance cost from the investment return explicitly
3. Compare against a like-for-like alternative (e.g., term cover + separate deposit/investment) on guaranteed-outcome terms, not headline terms
4. Re-test under different tax assumptions, since the "right" comparison depends heavily on your bracket
5. Let the spreadsheet solve for the answer — don't eyeball it. The gap between an assumed rate and a formula-derived one is usually where the real story is.

Two worked spreadsheets are linked below, formula-driven end to end, so you can trace or challenge every number yourself — change any assumption cell and the IRR and required-rate figures recalculate automatically.

• Assured Income Plan — Cash Flow Calculation (as per issuer illustration)
  • Plain Deposit + Term Insurance — Comparable Cash Flow Calculation

Disclaimer: This article is for educational and informational purposes only and reflects the author's personal analysis, opinions, and independently constructed calculations. It is not investment or insurance advice, and does not constitute a recommendation to buy, sell, hold, surrender, or avoid any specific insurance product, plan, or financial instrument. The named product is referenced solely as a case study to illustrate a general analytical framework for evaluating "assured return" illustrations and is not a judgment on its suitability, value, or performance. All calculations are based on publicly available illustrations and stated assumptions (including tax bracket, premium levels, and term insurance cost), which are illustrative and may not reflect current rates, terms, or an individual reader's circumstances. Insurance and investment products serve different purposes, and readers should evaluate their own protection and investment needs separately. Please consult a SEBI-registered investment advisor and/or a licensed insurance advisor before making any financial decision. Investing Shop and its author accept no liability for outcomes arising from reliance on the frameworks or calculations discussed here.