What is a fiscal year?

Published Monday 15 June 2026

Table of contents

• What is a fiscal year?
• Fiscal year vs. calendar year
• Why businesses use a fiscal year
• Common fiscal year examples
• How to choose a fiscal year for your business
• IRS requirements for fiscal years
• Simplify your fiscal year reporting with Xero
• FAQs on fiscal years

Key takeaways

• A fiscal year is any 12-month period a business uses for accounting and tax reporting, and it doesn't have to match the calendar year.
• Choosing the right fiscal year can help you align financial reporting with your busiest season, giving you clearer year-over-year comparisons and more flexibility for tax planning.
• Sole proprietors and S corporations generally must use a calendar year, while C corporations have more freedom to select a different fiscal year end.
• If you need to change your fiscal year after you've started filing, you'll need to submit IRS Form 1128 and meet specific eligibility requirements.

What is a fiscal year?

A fiscal year is a 12-month accounting period that a business, government, or organization uses for financial reporting and tax purposes. Unlike a calendar year, a fiscal year can start on any date and end 12 months later.

For example, if your business's fiscal year begins on April 1, it would end on March 31 of the following year. You'd use that 12-month window to track revenue, expenses, and profits, then file your tax return based on those dates.

The term is sometimes written as fiscal year (FY), followed by the year in which the period ends. So a fiscal year ending in 2026 would be called FY26, regardless of when it started.

Fiscal year vs. calendar year

The simplest way to understand the difference is by looking at the dates. A calendar year always runs from January 1 to December 31. A fiscal year is any 12-month period you choose for your accounting and tax cycle.

Many small businesses default to a calendar year because it's straightforward and aligns with personal tax filing. Your income, expenses, and tax obligations all follow the same January-to-December timeline, which keeps things simple if you're a sole proprietor or a single-member LLC.

A fiscal year makes more sense when your business has strong seasonal patterns. If most of your revenue comes in during the fall, closing your books on December 31 means you're wrapping up your financial year right in the middle of your busiest period. Shifting to a fiscal year that ends after your peak season gives you a cleaner picture of annual performance.

Why businesses use a fiscal year

Choosing a fiscal year that matches your business's natural revenue cycle can make your financial reporting more accurate and useful. Here are the main reasons businesses opt for a non-calendar fiscal year.

• Seasonal alignment: if your busiest months fall at the end of the calendar year, a different fiscal year end lets you capture a full cycle of high and low periods in one reporting window.
• Better year-over-year comparisons: when your fiscal year mirrors your operating cycle, comparing financial statements from one year to the next becomes more meaningful.
• Tax planning flexibility: a fiscal year that ends during a slower period gives you more time to review your numbers and make strategic decisions before your tax deadline.
• Smoother audit and reporting processes: accountants and auditors are less busy outside of the January-to-April tax rush, so you may find it easier to get professional support when your year-end falls at a different time.
• Cash flow management: closing your books after your peak revenue season means you're more likely to have the cash on hand to cover any tax obligations.

Common fiscal year examples

Not every organization follows the same fiscal year, and the variation across industries can be significant. Here are some of the most common fiscal year schedules you'll encounter.

• US federal government: the government's fiscal year runs from October 1 to September 30. FY26, for example, covers October 1, 2025 through September 30, 2026.
• Retail businesses: many retailers use a fiscal year running from February 1 to January 31, which captures the full holiday shopping season and post-holiday returns within a single reporting period.
• School districts and educational institutions: most follow a July 1 to June 30 fiscal year, aligning with the academic calendar.
• Nonprofits: many nonprofit organizations also use a July 1 to June 30 fiscal year, though some align with their primary grant or fundraising cycles.

Understanding when other organizations close their books can help you plan ahead, especially if you work with government contracts, educational institutions, or seasonal suppliers. Knowing when your clients' end of fiscal year falls can help you time invoices and proposals more effectively.

How to choose a fiscal year for your business

Picking the right fiscal year depends on your business structure, industry norms, and how your revenue flows throughout the year. Here are the key factors to consider.

• Industry practices: check what's standard in your sector. If most businesses in your industry use a specific fiscal year, aligning with them makes benchmarking and reporting easier.
• Seasonal revenue patterns: choose a year-end date that falls after your peak season rather than in the middle of it. This gives you a complete picture of your busiest period in one set of financial statements.
• IRS rules for your entity type: confirm whether your entity type requires a calendar year. Sole proprietors, partnerships, and S corporations generally must use one unless they can demonstrate a valid business purpose for a different period. C corporations have more flexibility.
• Accounting and tax support availability: consider whether your year-end falls outside the traditional January-to-April busy season. If it does, you may find it easier to book time with your accountant or tax advisor.
• Alignment with small business accounting practices: start with a calendar year if you're just getting started. You can always request a change later if your business grows or your revenue patterns shift.

IRS requirements for fiscal years

The IRS has specific rules about which businesses can use a fiscal year and when tax returns are due. Understanding these requirements helps you stay compliant and avoid penalties.

Filing deadlines vary depending on your business entity type. C corporations must file their return by the 15th day of the 4th month after their fiscal year ends. For S corporations and partnerships, the deadline is the 15th day of the 3rd month after the fiscal year ends. If you're a sole proprietor using a calendar year, your return is due on April 15.

If you want to change your fiscal year after you've already been filing, you'll need to submit IRS Form 1128, Application to Adopt, Change, or Retain a Tax Year. The IRS will evaluate whether you have a valid business purpose for the change. In some cases, you may qualify for automatic approval, which simplifies the process.

Changing your fiscal year creates a short tax year for the transition period. You'll need to file a return covering the months between your old year-end and your new one. Working with a qualified tax preparation professional can help you navigate the paperwork and avoid common mistakes.

Simplify your fiscal year reporting with Xero

No matter which fiscal year your business follows, Xero makes it straightforward to stay on top of your financial reporting. With customizable reporting periods, you can generate profit and loss statements, balance sheets, and cash flow reports that match your exact fiscal year dates.

Automated bank feeds pull in your transactions daily, so your books are always up to date. And with real-time financial data available from any device, you can check your numbers whenever you need to, without waiting for month-end. Get one month free.

FAQs on fiscal years

Here are answers to some frequently asked questions about fiscal years.

What does FY26 mean?

FY26 stands for "fiscal year 2026" and refers to a 12-month accounting period that ends in calendar year 2026. The exact start and end dates depend on the organization; for the US federal government, FY26 runs from October 1, 2025 to September 30, 2026.

When does the US government fiscal year start?

The US federal government's fiscal year starts on October 1 and ends on September 30 of the following year. This schedule has been in place since 1976, when Congress shifted the start date from July 1 to give lawmakers more time to complete the budget process.

Can you change your fiscal year?

Yes, but you'll need IRS approval in most cases. You must file Form 1128 and demonstrate a valid business purpose for the change. Some businesses qualify for automatic approval, while others go through a more detailed review process.

What is the difference between a tax year and a fiscal year?

A tax year is the 12-month period you use to calculate and report your taxable income to the IRS. A fiscal year is one type of tax year; the other type is a calendar year. If your tax year runs January 1 to December 31, it's a calendar year. Any other 12-month period is a fiscal year.