A fiscal year is simply the 12-month period your business uses for financial reporting and tax filing. It can start on any date — January 1 for a calendar-year business, April 1 for a business that chose a different fiscal year end, or any other date that makes operational sense. The IRS allows most small businesses to choose their fiscal year when they first file.
Calendar year vs. fiscal year
Most small businesses operate on a calendar year (January 1 through December 31) because it's simple and aligns with how most people think about time. Some businesses choose a fiscal year that aligns with their natural business cycle — a summer-seasonal business might end its fiscal year in September, after peak season revenue has been collected and before the slow winter begins. This makes financial statements more meaningful: year-end reflects the full season rather than cutting through the middle of it.
Why your fiscal year matters for bookkeeping
Your fiscal year determines when your year-end financial statements are prepared, when your tax return is due, and when quarterly estimated tax payments are calculated. Changing your fiscal year after the fact requires IRS approval and can create short tax years — so if you have a preference, establish it when you first set up the business and confirm with your CPA.
Fiscal year and month-over-month comparison
Within your fiscal year, comparing the same month across years (January 2025 vs. January 2024) is more meaningful than comparing adjacent months for seasonal businesses. Understanding which comparisons are fair — and which are distorted by seasonality — is part of reading your own financial statements accurately.
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