
13 period accounting is a type of accounting system that divides the year into 13 equal periods, rather than the traditional 12 months. This allows for more frequent financial reporting and analysis.
Each period is typically 4 weeks long, giving businesses a more detailed picture of their financial performance throughout the year. This can be particularly useful for companies with fluctuating sales or revenue.
The 13th period is often used to account for any remaining revenue or expenses that don't fit into the other 12 periods. This can help to ensure that all financial transactions are accurately recorded and accounted for.
By using a 13 period accounting system, businesses can gain a more accurate and detailed understanding of their financial performance, which can inform strategic decisions and improve overall financial management.
Periods
Having 13 accounting periods can be a game-changer for your business, especially when it comes to comparing financials during different periods. Each accounting cycle is typically four weeks long, or 28 days, instead of 12 calendar months.
This allows for an extra accounting period each year, making it easier to compare apples to apples. With 13 periods, holidays generally fall into the same week of the same period every year, simplifying the process.
You can use a 13th period accounting at year-end on a singular day, or another shorter period, to make adjustments. For example, if you have your accounting periods monthly, you can have your 12th period from December 1 – December 30 and your 13th period just a day before you wrap up the calendar year.
Having 13 accounting periods can help you spot trends, simplify cost monitoring, ensure payroll is more accurate on your P&L statement, make it simpler to account for payroll, and help you better plan inventory.
Here are some key benefits of having 13 accounting periods:
- Helps you spot trends
- Simplifies cost monitoring
- Ensures payroll is more accurate on your P&L statement
- Makes it simpler to account for payroll
- Helps you better plan inventory
Purpose and Benefits
Having 13 accounting periods can bring numerous benefits to your business. It makes it easier to compare numbers and reports.
Spotting trends is a major advantage, as it allows you to identify areas where you can improve and make data-driven decisions. This can be done by analyzing the data from your 13 accounting periods.
Simplifying cost monitoring is another benefit, as it helps you keep track of your expenses and stay within your budget. This can be especially useful for businesses with fluctuating costs.
Payroll accuracy is also improved, with a 13th accounting period ensuring that payroll is more accurate on your P&L statement. This can save you time and money in the long run.
Accounting for payroll becomes simpler, as you can break down your payroll costs into smaller, more manageable chunks. This makes it easier to plan and budget for future expenses.
Better planning of inventory is another benefit, as you can use the 13 accounting periods to track your inventory levels and make informed decisions about stock.
13-Month Period
A 13-month period is a unique accounting setup where an extra month is created to account for specific transactions, such as bad debt and write-offs. This allows for a more organized and efficient way of handling year-end accounting.

In a 13-month period, you create an artificial month, often referred to as the "13th" month, which is used to account for these transactions. This setup can be beneficial for businesses that need to track and manage these types of transactions separately.
With a 13-month period, you can simplify cost monitoring and ensure payroll is accurate on your P&L statement. This can also help with inventory planning and management.
However, it's essential to note that a 13-month period may not be suitable for every business, and it's crucial to weigh the pros and cons before making a decision.
Here are some key differences between a 13-month period and 13 accounting periods:
By understanding the differences between these two accounting setups, you can make an informed decision about which one is best for your business.
Downsides and Considerations
Having 13 accounting periods can be a bit of a challenge to implement, especially when it comes to synchronizing with bank statements. This can be a real hurdle, especially if your bank only produces statements on a monthly basis.

To overcome this, you may need to talk with your bank about accommodating a 13 four-week cycle instead, or use online banking to gather statements.
Coordinating the periods with other business expenses and taxes can also be a challenge. Many business expenses, like rent and utilities, are due monthly, which can make it tricky to keep everything aligned.
You may need to consider tracking these expenses on a spreadsheet to help keep everything organized.
Some accounting software may not be able to accommodate 13 accounting periods, which can limit your options. Be sure to check with your provider to see if they offer any workarounds or alternative solutions.
Here are some specific challenges to consider when deciding whether to switch to a 13 period accounting cycle:
- Synchronizing with bank statements
- Coordinating the periods with other business expenses and taxes
- Having limitations with accounting software
Example and Calendar
Let's take a look at what an accounting period with 13 periods would look like. Each period has a specific start and end date, which can vary from year to year.
Here's an example of what 13 accounting periods might look like: the first period starts on January 1 and ends on January 28, the second period starts on January 29 and ends on February 25, and so on.
You can see that the dates vary, with each period getting progressively longer. The last period starts on December 3 and ends on December 31.
Here's a breakdown of what the 13 periods might look like in a calendar year:
- 1: January 1 – January 28
- 2: January 29 – February 25
- 3: February 26 – March 25
- 4: March 26 – April 22
- 5: April 23 – May 20
- 6: May 21 – June 17
- 7: June 18 – July 15
- 8: July 16 – August 12
- 9: August 13 – September 9
- 10: September 10 – October 7
- 11: October 8 – November 4
- 12: November 5 – December 2
- 13: December 3 – December 31
Keep in mind that these dates can vary depending on whether it's a leap year or not.
Frequently Asked Questions
What is a period 13 journal?
A period 13 journal is a special type of entry that allows you to record transactions in a prior year, even after the year-end has been processed. This type of journal entry is typically used to correct or update financial records from a previous year.
What is the 13 four week period?
The 13-period planning calendar is divided into four-week periods, except for every 5-6 years when one period has 5 weeks. This unique structure allows for more flexible and consistent planning throughout the year.
What is a 13th month adjustment?
A 13th month adjustment is a payment made to reconcile estimated revenues and expenses with actual amounts at the end of a period, usually a calendar year. It's a common practice in business agreements where parties split costs or revenues based on estimates.
Sources
- https://www.patriotsoftware.com/blog/accounting/13-accounting-periods/
- http://help.mamut.com/uk/mhelp/rtm/accounting/year_end/yearend_periods_concepts.htm
- https://blog.bodellconsulting.com/2008/02/23/should-we-switch-to-a-13-period-accounting-cycle/
- https://financeandbusiness.ucdavis.edu/finance/accounting-financial-reporting/reporting/fiscal-period
- https://docs.oracle.com/en/cloud/saas/planning-budgeting-cloud/epbca/common_p13_about_13_period_calendars_100xc0aae8c3.html
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