Cash Back Calculator — Calculations & Slabs for FY 2026-27
Enter your spending categories and credit card cash-back rates to compute total annual cash-back earnings and compare across cards.
1. Enter Spending & Card Profiles
Monthly Spending
Card A Rewards
Card B Rewards
Evaluating Cash Back & Rewards Credit Cards
Choosing the right rewards credit card is a mathematical optimization problem based on your unique spending habits. Many consumers fall for high promotional rates (e.g. 5% or 6% on certain categories) without analyzing their actual monthly volumes or factoring in the drag of annual fees.
The Drag of Annual Fees
An annual fee acts as a negative cash flows starting point. If Card A has a $95 annual fee and offers 3% flat cash back, while Card B has a $0 fee and offers 2% flat cash back:
To find the break-even point where Card A becomes superior, we set up the inequality: $$\text{Spend} \times 0.03 - 95 > \text{Spend} \times 0.02$$ $$\text{Spend} \times 0.01 > 95$$ $$\text{Spend} > \$9,500\text{ annually}$$ If you spend less than $9,500 annually ($792 per month), the no-fee 2% card actually yields a higher return, despite the lower nominal percentage rate.
Category Optimization Strategy
Most premium cards optimize rewards for specific categories (Groceries, Dining, Travel, Gas) while lowering the baseline rate to 1% for everything else. Because of this, consumers can maximize yields by combining a high-earning category card with a flat-rate card. For example, charging groceries and gas to Card A (earning 3%–6%) and charging general services, bills, and retail items to Card B (earning a flat 2%) yields a higher net return than using a single card for all purchases.