Buen Fin Without Surprises: How I Learned How Much Credit I Really Had Left

Last year, a week before Buen Fin, I sat down with what seemed like a simple question: how much credit do I have left? It took me almost an hour to answer. And the answer was quite a bit lower than I thought.

For context: Buen Fin is Mexico's biggest sales weekend, similar to Black Friday. This year it runs from November 13 to 17 (Excélsior, in Spanish). Amounts here are in Mexican pesos. I'm sharing what happened to me because I wish I had read it earlier. It's not a recommendation on what to buy or how to pay; it's what I learned about my own card.

The Number I Was Looking At Wasn't the Real One

For a long time, when I wanted to know how much credit I had, I opened my last statement and looked for the "available credit" line. That was my number.

What I hadn't understood is that this figure was a snapshot of the statement date. My statement date was the 10th, and I was checking on the 5th of the following month. In between, almost four weeks of purchases, automatic charges and an installment purchase had gone by that didn't appear on any statement yet.

When I opened my bank's app to see the current available credit, the difference was several thousand pesos. That was the first lesson: my statement told me how I was, not how I am.

The Three Gaps Where My Credit Was Disappearing Unnoticed

When I sat down to review calmly, I found three things I wasn't counting.

1. My installment purchases used up the full limit

It had happened to me before (I tell the story in how I learned to track my interest-free installments). On my card, a $7,200 purchase on 12 installments didn't take up $600 of my limit; it took up the full $7,200 and was released month by month.

That year I had two active installment purchases. Adding up what I still owed on each, $11,800 of my limit wasn't available, even though I "felt" it was mine.

2. Automatic charges I no longer remembered

I had four services charging my card every month: two video platforms, cloud storage and a membership I had forgotten about. Together they came to about $650 a month, but since they were charged on different days, I never saw them together.

3. Purchases that hadn't "shown up" yet

I had paid for a dinner and an online purchase a couple of days earlier. In the bank's app they still appeared as pending, but they were already subtracting from my available credit. I had completely forgotten them because "they weren't on the statement."

How I Calculated My Real Credit

In the end I did a very simple calculation on a sheet of paper. I'm sharing it as what I did, not as a method anyone should follow:

I had arrived convinced I had about $28,000 for Buen Fin. I had $18,000.

That number didn't tell me what to do. But it took the blindfold off: any decision I made those days would be made with the real figure, not the one I imagined.

The Mistakes I Made Getting Ready

Looking back, these were my missteps:

• Checking the statement instead of today's available credit. I confused "balance at statement date" with "what I have today."
• Adding up monthly payments instead of commitments. I kept thinking "a thousand a month" when my credit limit saw the total.
• Not having a list of automatic charges. Each one was small; together they were a fixed part of my card.
• Doing the calculation only once. On the first day of Buen Fin I bought something, and by the second day I was already using the old number.

What Helped Me See It Without Doing the Math Every Time

After that experience I started tracking my cards in an app that could show me that number on its own. It's one of the reasons the credit card works the way it does in iClara PFM:

• The card has its credit limit and its statement day. Transactions are grouped from statement date to statement date, like the real statement, not by calendar month.
• Installment purchases are recorded in full. When you save an installment purchase, all its installments are created and the card's balance reflects the total commitment from that day.
• A bar shows available and used credit. In each card's detail view, you see what's left in green and what's used in red, with the percentage and the available amount.
• Everything works without connecting your bank. Transactions are entered by hand and stay on the device; the app has no access to any bank account.

The manual part has an upside I didn't expect: entering each purchase forces me to see it. During Buen Fin, that made every "yes" a bit more conscious.

The app is a one-time purchase and supports Apple's Family Sharing: whoever buys it can share the download with up to five members of their family group. Each person uses it on their own device, and their data isn't shared with anyone in the group. Apple explains how to set it up in its Family Sharing guide.

See iClara PFM on the App Store

Questions I Asked Myself Along the Way

The answers reflect my experience and what I found in public sources. Each card has its own terms, so the most reliable step is to confirm them with your bank.

Is the available credit on my statement the same as what I have today?

In my case, no. The statement shows available credit as of the statement date. Later purchases, automatic charges and payments change it, and that only shows up in today's available credit.

Do installment purchases reduce my available credit in full?

On my card, yes: the total purchase amount was deducted from my limit when I bought it and was released with each installment.

Do pending charges already count against my limit?

In my experience, yes. They appeared as pending in the bank's app, but they were already subtracting from my available credit.

What I Take Away

Buen Fin didn't catch me off guard because of the deals, but because of a number I thought I knew. Knowing how much I really had left didn't decide for me what to buy. What changed was that, for the first time, I decided with the right number in front of me.