Credit card do's and don'ts : Brain

The rules that decide whether a credit card pays you or costs you, written for Indian issuers, cards, and bureaus.

Pay the full statement amount, on time, every month, and keep reported utilization low. Everything else on this page is detail. A card that carries a balance loses money no matter how good the reward rate looks.

The rules below assume Indian issuers, so they name CIBIL, RBI rules, GST, and the usual local fee traps. The habits generalise, the numbers do not. Rates and rules below were checked in September 2026. For what the wallet as a whole should look like, see portfolio-goals, and for who to apply to, issuers.

Do

Rule	Why
Pay the full statement amount	Revolving a balance costs about 42-45% p.a. on most cards, and up to 48% on the worst, plus 18% GST on that interest. No reward rate comes close.
Never miss a due date	Payment history is the single largest input to the CIBIL score. Nothing is reported past due until it stays unpaid more than three days after the due date, and past that point the bureau records the actual days late, so a payment 12 days late reads as DPD 12. India has no 30-day grace before reporting, that is a US convention. A delinquency then sits on the report for years.
Set AutoPay to "total amount due"	Default on most apps is minimum due. Change it. Keep enough balance a day before, since NACH debit fails silently.
Pay down before the statement date, not just the due date	Bureaus see the balance on the statement date only. Spending 80% of the limit and clearing it on the due date still reports 80% utilization.
Keep reported utilization under 30%	Per card and overall. Under 10% before a loan application.
Space applications 3-6 months apart	Keeps hard enquiry density low and improves premium-card approval odds.
Apply only with a clear purpose	Each new card should add something: a new issuer relationship, a better category rate, a travel ecosystem, or a milestone worth hitting.
Track annual fees and their waiver thresholds	Note the fee, the spend needed to waive it, and the renewal month. Decide to keep or exit before renewal, not after.
Use every card at least once a quarter	Small spend keeps it active. Under RBI rules an issuer can close a card unused for a year after notice, and a closed card shortens credit history.
Pull credit reports regularly	One free full report per calendar year from each of the four bureaus (CIBIL, Experian, Equifax, CRIF). Lenders have reported every 15 days since Jan 2025 and weekly since 1 July 2026, on the 9th, 16th, 23rd and last day, so a payment or a closure shows up fast and so does a mistake.
Check merchant offers before big purchases	Instant discounts on Amazon, Flipkart, and Croma often beat the card's own reward rate. Stack with a no-cost EMI only after checking the actual cost.
Route spend by category	Match the spend to the highest effective return, counting caps and exclusions rather than headline rates. UPI is its own category: only RuPay credit cards link to UPI, rewards there are usually capped, and NPCI limits MDR-bearing transactions to Rs 2,000, so larger UPI spends earn base rate at best.
Ask for limit increases, do not use them	Higher limit lowers reported utilization. Ask first whether that issuer runs a soft or a hard pull, since policy differs by bank. An issuer cannot raise the limit on its own, RBI needs your explicit consent.
Review the wallet once a year	Issuers cut reward rates and add exclusions mid-year without much noise, so a card that paid for itself last year may not now.
Report a fraudulent charge within 3 working days	Report in that window and your liability is zero. Between four and seven working days it is capped, up to Rs 25,000 depending on the card. After that it is the bank's policy, not your right.
Pick the card network at issuance or renewal	Since Sept 2024 any issuer with over 10 lakh active cards has to offer a choice of network. RuPay for UPI linking, Visa or Mastercard for acceptance abroad.
Set the billing cycle date once	RBI gives you the right to choose the statement start or close date at least once. Move it so the due date lands a few days after salary credit.
Close a card in writing and hold the clock	With no dues outstanding, closure has to complete in seven working days, and the issuer owes Rs 500 a day beyond that. Get the closure confirmation over SMS or email.
Redeem points before they rot	Most Indian programs expire points in 2-3 years, and transfer ratios get cut without notice. Sitting on a large balance is a slow loss.

Don't

Rule	Why
Don't spend to earn rewards	1-5% back on money you would not have spent is a 95-99% loss.
Don't cluster applications	Several hard enquiries in a short window sink approval odds, and some issuers reject on enquiry count alone.
Don't close old cards, especially LTF ones	Closing shortens average account age and cuts total available credit, pushing utilization up on both counts.
Don't withdraw cash	Interest starts on day one with no grace period, plus a 2.5-3% withdrawal fee. Wallet loads, forex purchases, and some gold or crypto buys are also coded as quasi-cash by many issuers.
Don't pay only the minimum	It dodges the late fee but keeps the balance accruing interest, and the interest-free period on new spends disappears until the balance clears. The minimum due now covers all interest, fees and taxes plus 5% of the balance, so the debt no longer grows on its own, it just shrinks painfully slowly.
Don't skip the statement	Check every line for wrong charges, subscriptions you forgot, and duplicate debits. Visa, Mastercard and RuPay allow a chargeback up to 120 days from the transaction, but issuers set their own shorter windows, so raise it in the same billing cycle.
Don't hoard paid cards	Each one needs to earn its fee back in cash terms, not in points you will never redeem.
Don't chase every LTF offer	Take one only when it adds a new issuer relationship or a genuine benefit. Each one still costs an enquiry.
Don't apply before a big loan	Keep the profile quiet for 6 months before a home or car loan application.
Don't assume no-cost EMI is free	Interest is usually rebated but GST on it is not, the processing fee stays, and the amount blocks your limit for the full tenure.
Don't route rent, fuel, wallet loads, or education through a card for points	Most issuers now charge about 1% on these, strip the rewards, or both. HDFC charges 1% on rent (capped at Rs 4,999), on wallet loads and gaming above Rs 10,000 a month, and on utilities once monthly spend crosses Rs 50,000. SBI Card charges 1% on utility bills above Rs 50,000 in a cycle. Axis excludes rent, fuel, utilities, insurance, wallets, and gift cards from rewards outright. Check your own card's terms, these move every few months.
Don't ignore forex markup	3.5% markup plus 18% GST on the markup is about 4.1%, which wipes out most reward rates. Use a low-markup card abroad. TCS under LRS starts above Rs 10 lakh a year since April 2025, at 20% for travel and investment, and card spends abroad sit outside LRS for now, though the government keeps proposing to bring them in.
Don't accept an unsolicited card or upgrade	Issuing or upgrading without explicit consent and then billing for it means the charges get reversed plus a penalty of twice that value, and the RBI Ombudsman can add compensation on top.
Don't treat a card's perks as fixed	Lounge visits, insurance, and milestone benefits moved to spend-linked criteria across HDFC, SBI, and Axis through 2025 and 2026. Read the revised terms mail rather than the sales page.
Don't share OTP, CVV, or card images	No bank asks for these. Keep international and contactless toggles off until needed and set per-transaction limits in the app.
Don't let a new card sit unactivated	Past 30 days from issue the issuer has to seek OTP consent to activate, and without it the account closes within seven working days at no cost. The hard enquiry stays on your report either way.

Credit card do's and don'ts

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