The quick answer
Go to Setup > Accounting > Fiscal Calendars and create a new calendar with the right First Fiscal Month. Edit the subsidiary under Setup > Company > Subsidiaries and change its Fiscal Calendar. Tax Fiscal Calendar is a separate field, so leave it alone unless the tax year changes too. Then open Manage Accounting Periods, select the new calendar and run Set Up Full Year, because assigning a calendar doesn't create its years or quarters.
In this example the parent and its US subsidiary report on a January to December year, and a new Australian subsidiary needs a July to June year. We create July Fiscal Year, move Example Supply Australia onto it, check the result from three places, and generate FY 2027 for the new calendar. The person and operating-company names in the screenshots are fictional example data.
Before you start
Fiscal calendars only exist in OneWorld accounts with the Multiple Calendars feature enabled (Setup > Company > Enable Features, Accounting subtab). Turning it on creates the Standard Fiscal Calendar and puts every existing subsidiary on it. If Fiscal Calendars is missing from the Setup menu, the feature is off or your role can't see it. In some accounts the page sits one level deeper, under Setup > Accounting > Manage G/L.
The walkthrough uses the Administrator role. Another role needs permission to edit subsidiaries, fiscal calendars and accounting periods.
The subsidiary here is new and has no posted transactions. Moving a subsidiary with history is a bigger job: its existing periods have to be covered by the new calendar's years, which can mean building a short transition year with New Year Only and New Quarter Only before generating full years. Plan that coverage and try it in a sandbox first. Once a non-standard calendar is assigned to a subsidiary, you generally can't turn Multiple Calendars back off.
01. Check the current calendar
Go to Setup > Accounting > Fiscal Calendars. This account has one calendar, Standard Fiscal Calendar, with First Fiscal Month January and Default Fiscal Calendar Yes.
Click Standard Fiscal Calendar. The Subsidiaries subtab lists every subsidiary that uses it for accounting periods, and right now that's all three, Example Supply Australia included. The Tax Calendar Subsidiaries subtab lists the same three for tax periods.
02. Create the July calendar
Click List at the top right to go back to Fiscal Calendars, then click New Fiscal Calendar. Enter July Fiscal Year in Name and pick July in First Fiscal Month.
Leave Default Fiscal Calendar clear. The default only decides which calendar subsidiaries created later start with; it doesn't move existing ones. New subsidiaries here should keep getting the standard one. Don't change the standard calendar's first month instead; the other subsidiaries use it.
Click Save. The list now shows both calendars: Standard Fiscal Calendar (January, default Yes) and July Fiscal Year (July, default No). If you open July Fiscal Year now, its Subsidiaries subtab says No records to show. Nothing uses it yet.
03. Assign it to the subsidiary
Go to Setup > Company > Subsidiaries and click Edit next to Example Supply Australia. Change Fiscal Calendar from Standard Fiscal Calendar to July Fiscal Year.
Leave Tax Fiscal Calendar on Standard Fiscal Calendar. It controls how tax reporting periods roll up, which is a separate decision from the accounting year. If the tax year has to move too, change this field as well and set up that calendar's tax periods separately under Manage Tax Reporting Periods.
Click Save. In this walkthrough NetSuite goes back to the Subsidiaries list. Click View next to Example Supply Australia and check the saved record: Fiscal Calendar July Fiscal Year, Tax Fiscal Calendar Standard Fiscal Calendar.
04. Confirm the assignment
Open Setup > Accounting > Fiscal Calendars and click July Fiscal Year. Example Supply Australia is now on its Subsidiaries subtab. Its Tax Calendar Subsidiaries subtab is empty, which is right, because the tax calendar didn't change.
Click List and open Standard Fiscal Calendar. Its Subsidiaries subtab has two entries now, and Tax Calendar Subsidiaries still has all three.
To find subsidiaries by calendar in a bigger hierarchy, go to Setup > Company > Subsidiaries > Search. Select July Fiscal Year in the Fiscal Calendar filter and click Submit. The results list one subsidiary.
05. Generate the July year
Assigning the calendar doesn't give it any years or quarters. Go to Setup > Accounting > Manage Accounting Periods and select July Fiscal Year in the Fiscal Calendar filter. There are no fiscal years, only an Unassigned group. Expand it and you'll see the monthly periods that already exist in the account. Months are shared across calendars; years and quarters belong to each calendar.
Click Set Up Full Year. Fiscal Calendar shows July Fiscal Year and the read-only First Fiscal Month shows July, taken from the calendar. Enter 2027 in Fiscal Year End. Fiscal Year End names the year being generated, so with a July start, 2027 means July 2026 to June 2027. Check that FY 2027 doesn't already exist for this calendar before you save.
Keep Period Format on Calendar Months, the same format as the existing months, and Year In Period Name on Ending Year of Period. That setting is why the year is labeled FY 2027; Starting Year of Period would label it FY 2026. Leave One-Day Year-End Adj. Period clear so the year has exactly twelve months. Click Save.
Back on Manage Accounting Periods, expand FY 2027. Q1 2027 holds Jul 2026, Aug 2026 and Sep 2026, and Q4 2027 ends with Jun 2027. Expand Unassigned again: no month from July 2026 to June 2027 is left there. Those twelve months already existed, so NetSuite reused them. If a month in the range is missing, Set Up Full Year creates it.
06. Compare the two calendars
Switch the filter to Standard Fiscal Calendar and expand FY 2027. There, Q1 2027 still holds Jan 2027, Feb 2027 and Mar 2027. Same months, different rollup. Period-based accounting reports for Example Supply Australia now use the July calendar's years and quarters, while the other two subsidiaries stay on January. Its tax reporting still follows the standard calendar, and existing transactions keep their dates and periods.
The walkthrough covers the setup and the period structure. It doesn't post transactions, set up tax periods or run a report, so check a period-based report for the subsidiary once the first July-year transactions are in. If you use budgets or forecasts by period, review those for the subsidiary too.
Common questions
Why is the Fiscal Calendars menu missing?
The Multiple Calendars feature is off, or your role can't see the page. The feature only exists in OneWorld accounts. If it's enabled and you still can't find the page, ask an administrator to check your role's permissions.
What's the difference between Fiscal Calendar and Tax Fiscal Calendar?
Fiscal Calendar decides how a subsidiary's accounting periods roll up into years and quarters. Tax Fiscal Calendar does the same for tax periods. They can point at different calendars, which is what happens here: Example Supply Australia uses July Fiscal Year for accounting and stays on Standard Fiscal Calendar for tax.
Does assigning a fiscal calendar create accounting periods?
No. The new calendar has no years or quarters until you create them in Manage Accounting Periods, usually with Set Up Full Year. In this example that run creates FY 2027, July 2026 through June 2027.
Are accounting periods shared between fiscal calendars?
The monthly periods are. Years and quarters belong to each calendar. That's why the same Jul 2026 to Sep 2026 months sit in Q1 2027 on July Fiscal Year while the standard calendar's Q1 2027 is still Jan 2027 to Mar 2027.
What does Fiscal Year End 2027 mean with a July start?
It names the year that ends in 2027. With July as the first month, FY 2027 runs from July 2026 to June 2027, and Q1 2027 is July to September 2026. That label comes from Year In Period Name set to Ending Year of Period.
Does changing Default Fiscal Calendar move existing subsidiaries?
No. The default only applies to subsidiaries created afterward. Existing subsidiaries keep their calendar until you edit each one.
Can I change the calendar on a subsidiary that already has transactions?
Often yes, but it depends on the account and the periods already in use. The subsidiary's history has to be covered by the new calendar's years, which can mean a short transition year. Test it in a sandbox and check the reporting impact before you change a live subsidiary.
How do I find which subsidiaries use a calendar?
Open the calendar under Fiscal Calendars. The Subsidiaries subtab lists subsidiaries that use it for accounting periods, and Tax Calendar Subsidiaries lists the ones that use it for tax. For a long list, run a Subsidiary Search filtered by Fiscal Calendar or Tax Fiscal Calendar.