To use a credit card without getting into debt: always pay the statement in full, never the minimum; buy knowing your closing date, which decides when you pay; and use instalments only when the instalment fits the month and you know you'll be able to pay the full statement every month of the plan. The card isn't debt; the minimum payment is.
A credit card has two faces: used well, it's a month of free financing and instalments that, with inflation, are worth less and less; used badly, it's the most expensive debt most people carry without knowing it. The difference lies in three things almost nobody explains: what the closing date is, what happens when you pay the minimum, and what "interest-free" means when prices are rising.
Closing date and due date: the two dates that rule
The closing date is the day the card cuts off and builds the statement: everything you bought up to that day goes in; anything bought after goes to the next one. The due date is the day that statement has to be paid, a few days after the closing date. Buying the day after the closing date gives you up to an extra month to pay with no interest; buying the day before, you pay within days.
The closing date is almost never month end and varies by card: if you have two, they probably close on different days. The dates are on the statement and in the bank's app. Knowing them isn't for justifying a purchase you weren't going to make; it's for making a purchase you were going to make anyway land in the month that suits you.
- Statement closing date vs due date: why the day you buy changes everythingClosing vs due date with example dates, and the three mistakes that cost money.
- How to read your credit card statement and know what you'll payHow to read the statement: what each line is and what you'll really pay.
Minimum or full payment: the one non-negotiable rule
The statement shows two numbers: the total and the minimum payment. If you pay the total, you pay no interest: the month of financing was free. If you pay the minimum (or anything less than the total), the remaining balance is financed at the card's rate, among the highest there are, and new purchases the following month usually lose the free financing too. It's the mechanism by which a small debt becomes a big one in a few months.
The exact rate is set by each bank and appears on the statement as TNA, TEA and CFT (total financial cost, the one that includes everything). This guide doesn't publish rates because they change by bank and by month: check yours on the statement, and if you're financing a balance, it's the first debt to clear.
If you can't reach the total this month, the problem isn't the card: it's that last month more went out than came in. The minimum payment hides it for a month and grows it the next.
- How to get out of debt: snowball or avalanche, and which one to pickIf there's already a financed balance: snowball or avalanche to clear it.
Interest-free instalments: when they're an advantage and when a trap
With inflation, an instalment six months away is worth less than the same money today: that's why interest-free instalments, paid on time, come out cheaper than cash in present value. By how much depends on the inflation you assume and the number of instalments; the calculator does that maths with your numbers. If the instalment carries interest, the maths is the same and the result can go either way.
The trap isn't in the instalment: it's in piling up plans. Each instalment purchase commits months that haven't arrived yet, and with four or five open plans half of next month's statement is already decided. If one month the total can't be paid, the "interest-free" vanishes: the whole balance is financed at the card's rate.
- Before taking a new plan, add up the instalments you already have in the coming months. If the total is close to what you can pay, the new plan is debt.
- The instalment counts in the month it falls, not the whole purchase in the month of purchase. That's how you see how much of each future month is already committed.
- A cash discount changes the comparison: compare the discounted cash price against the instalment total.
- Is it better to pay in instalments or in cash?The calculator: present value of the instalments with the inflation you expect, and which is worth less under those assumptions.
- Interest-free instalments: why they wreck your month even when they cost nothingWhy instalments mess up the month even if you don't overpay, and how to avoid it.
How to keep track of the card
The most common mistake is recording the statement payment as an expense: the month then shows one giant line, "card", and nobody knows where it went. What works is logging each purchase on the day you make it, with its category, and treating the statement payment as what it is: the settlement of something already counted. Same with instalments: the purchase is logged once with the total and the number of instalments, and each month shows its own.
And a reminder before each due date. Not just because of late interest, which also exists, but because paying by transfer on the due date itself can be credited the next day and count as late.
The most common mistakes
- Paying the minimum "just this month". It's the month the debt starts.
- Believing the closing date is month end. It almost never is.
- Taking instalments without looking at the ones already there. Each plan is a commitment on months that haven't arrived.
- Counting an instalment purchase in full in the month of purchase, or not counting it until the statement arrives.
- Paying the statement by transfer on the due date and having it credited the next day.
Frequently asked questions
Should I pay the minimum or the full credit card balance?
The full balance, whenever possible. Paying in full means no interest. Paying the minimum, the remaining balance is financed at the card's rate (shown on the statement as CFT) and new purchases usually lose the free financing. If you can't reach the total, it's the first debt to clear.
When is it better to buy, before or after the closing date?
After the closing date: the purchase goes into the next statement and you pay it up to a month later, with no interest. Before the closing date, you pay it within days. It only helps for purchases you were going to make anyway.
Are interest-free instalments worth using?
With inflation, interest-free instalments paid on time are worth less than cash in present value; the calculator shows it with your numbers. The condition is being able to pay the full statement every month of the plan: if one month you pay the minimum, the balance is financed and the advantage disappears.
What are TNA, TEA and CFT?
Three ways of expressing the cost of financing a balance in Argentina. TNA is the nominal annual rate; TEA, the effective annual rate (with compounding); CFT, the total financial cost, which adds taxes and charges and is the number you actually pay. They're on the statement and vary by bank.
Does this guide recommend a card or a bank?
No. It explains how any credit card works. Rates, instalment programmes and perks change by bank and by month: check yours on the statement or in the bank's app.