Markets

Fiscal Years and Quarters: A Guide for Investors

Astron Team · 09/24/2026 · 6 min read

Anyone who follows the stock market sooner or later runs into abbreviations like Q1, Q2, Q3, and Q4, usually tied to companies' earnings releases. Understanding what these abbreviations mean, and why not every company follows the January-to-December calendar, helps make sense of why certain times of the year concentrate more volatility in specific stocks.

This article explains what a fiscal year is, how fiscal quarters work, and why this calendar matters to anyone who trades or invests in stocks.

What a fiscal year is

A fiscal year is the twelve-month period a company uses to organize its accounting and calculate results for tax purposes and market disclosure. While many companies use the traditional January-to-December calendar, others choose a different period, adjusted to the natural cycle of their own business.

A retail chain, for example, might close its fiscal year in January instead of December, to include the entire year-end sales season and the product returns that usually happen right after, before closing out the numbers for the period.

How fiscal quarters work

Within each fiscal year, companies split the period into four three-month blocks, called fiscal quarters, numbered Q1 through Q4 (the Q stands for quarter). For a company that follows the traditional calendar, the split looks like this: Q1 covers January, February, and March; Q2 covers April, May, and June; Q3 covers July, August, and September; and Q4 covers October, November, and December.

At the end of each quarter, publicly traded companies usually release an earnings report, showing revenue, profit, and other financial metrics for the period. These reports are closely watched by the market and often generate significant stock price moves on the day they're released.

Why this matters for those trading in the market

Quarterly earnings releases tend to be one of the highest-volatility events for a specific stock. If the result comes in above market expectations, it's common to see a significant price rally that same day; if it comes in below, the move tends to be a decline, sometimes a sharp one.

An example of the price effect

Imagine a stock trading at R$ 80 before releasing its quarterly results. If the company reports profit above what analysts expected, it's not uncommon to see a 5% to 10% jump in the price at the next open, which would represent a move of R$ 4 to R$ 8 in the quote within hours. The opposite also happens: disappointing results can generate declines of similar magnitude.

• Not every company follows the January-to-December calendar as its fiscal year.
• Every fiscal year is split into four quarters: Q1, Q2, Q3, and Q4.
• Quarterly earnings releases tend to generate high volatility.
• Check each company's specific fiscal calendar before trading near these dates.

How to follow a company's fiscal calendar

Most exchanges and financial information sites provide the earnings release calendar for listed companies, including the expected date of the next quarterly report. Before keeping a position open in a specific stock, it's worth checking whether an earnings release is scheduled for the coming days, since that considerably increases the risk of a sharp price move.

The difference between fiscal year and calendar year in analysis

When comparing results from different companies, especially from different countries or sectors, it's important to check whether the period reported as Q1, for example, corresponds to the same range of months in both, since each company's fiscal year can start in a different month.

How to use this information in practice

Before trading a specific stock, check the date of the next quarterly report and consciously decide whether you want to keep the position open through the announcement, aware of the higher volatility risk, or whether you'd rather reduce or close the position before the release. Whatever you choose, remember that quarterly results can surprise in either direction, and no prior analysis fully eliminates that risk.

It's also worth tracking, over time, whether a company tends to react similarly to results above or below expectations, since some assets have a history of more exaggerated reactions than others. This kind of observation, gathered quarter after quarter, helps calibrate realistic expectations about price behavior around these dates.