Change Tax Code in Sage 50 Payroll: Everything You Need to Know

Want to change tax code on Sage Payroll 50 but aren’t sure where to start? An incorrect or outdated tax code may result in the wrong amount of PAYE Income tax being deducted from an employee’s pay. However, the tax codes can change when HMRC sends a P6 or P9 notice, an employee’s circumstances change, or a new tax year begins.

In this detailed post, we have explained how to update tax codes correctly in Sage 50 Payroll and what to check after making the change.

What is a Tax Code in Sage 50 Payroll?

A tax code in Sage 50 Payroll is a combination of numbers and letters used by an employer to calculate how much Income tax to deduct from an employee’s pay or pension.

HMRC identifies an employee’s tax code and then sends the necessary information to the employer. Sage 50 Payroll then uses that code to compute the PAYE based on the applicable tax legislation.

What are the major reasons for change tax code in Sage 50 Payroll?

You may need to change an employee’s tax code in Sage 50 Payroll when HMRC issues a new coding notice or the employee’s tax circumstances change. Using the correct tax code helps ensure accurate PAYE deductions and keeps your payroll aligned with HMRC requirements.

• You may receive direct instructions from the tax authorities through P6 or P9 notices regarding the change in an employee’s personal allowance or job status.
• Also, you need to update the tax code at the time of onboarding staff members before the arrival of official coding notices.
• HMRC may provide you with guidelines to operate a code on a Week 1/Month 1 (W1/M1) basis instead of cumulatively.
• You can receive adjustments for individuals starting a second job, receiving taxable company benefits, or incurring shifts in secondary income sources.

How to Add a New Tax Code in Sage 50?

You generally do not create a new PAYE tax code manually in the same way you create a VAT/sales tax code in Sage 50 Accounts. Employee tax codes are issued by HMRC, and Sage advises changing an employee’s tax code when HMRC instructs you to do so

Use the Employee Wizard to add a tax code for a new employee.

• First, click on the Employee and then Employee Wizard option.
• Provide your employee’s personal and employment details.
• Enter the employee’s tax code when asked.
• Also, mention the NI number and category.
• Finish the process by completing rest of the details and click Finish.

How to Change Tax Code in Sage Payroll 50

To change an existing tax code on Sage Payroll 50, follow the instructions given below.

• First, click on Payroll.
• After this, double-click on the relevant employee.
• Launch the Employment tab.
• Now, enter the new tax code in the Tax Code field.
• Choose or clear the Wk/Mth1 Basis if needed by HMRC.
• After completing the process, click Save and then Close.

How to update your employees’ tax codes at payroll year-end

Before updating, at the beginning of each new tax year, verify whether your employees’ tax codes are correct.

The personal allowance will remain £12,570 for the taxation year 2026/27. It reflects that the emergency tax codes will also remain at 1257L. There is no need to apply an uplift to all employees’ tax codes.

At the start of the 2026/27 tax year, clear the Week 1/Month 1 (W1/M1) flag for employees unless HMRC has instructed you to keep it. After this, if HMRC sends you a P6 or P9 notice, then apply it to your employees. Here are the step-by-step instructions to clear the week 1/month 1 flag.

• Choose the Payroll option in the bottom left.
• Select the required employees.
• Click Tasks, then click Global Changes.
• Click Tax Codes, then click Clear W1/M1 flag.
• Click Yes, then click OK.

Update the tax code

If your personal allowance remains at £12,570, then you won’t have to apply an uplift to all employees’ tax codes this year. If HMRC sends you any tax code changes for individual employees, apply these before you process the first period of the 2026/2027 tax year.

Steps to change an employee’s tax code using the IR Secure mailbox

If HMRC sends you a P9 or P6 notification for changing an employee’s tax code, then you need to apply it in your software.

Note: If your tax code notice includes X after the code, then it clearly indicates that you need to set the week1 or month 1 flag. Consult with HMRC to get advice if you aren’t sure what tax code to enter.

IR Secure Mailbox Notification

If you haven’t used the HMRC IR Secure Mailbox before, check that electronic notifications are enabled before applying a P6 or P9 notice.

Follow these steps to apply the notification in Sage 50 Payroll.

• Move to e-Submissions and click IR Secure Mailbox.
• Choose the P6 or P9 notice, whichever you need.
• Click Apply to save the changes.

If HMRC provides a future Effective From date, Sage 50 Payroll automatically applies the new tax code when the Process Date reaches or passes that date.

Sage 50 Payroll will only apply for the new tax code when your Process date is on or after the Effective From Date on the notification.

How to Change Payroll Tax Rate in Sage 50

The following are the step-by-step instructions to change the payroll rate in Sage 50.

• First, move to the Home window and, on the Setup menu, choose Settings.
• Open Payroll and then choose Taxes.
• Now, change the rate in the payroll tax expense box.
• Finally, click OK to save the changes.

How to Download Sage 50 Payroll Tax Update 2026

The Sage 50 Payroll v32 contains the payroll legislation and updates that are required for the taxation year 2026 & 2027. However, before processing the employee’s payroll for the new tax year, install the latest version of payroll.

Check your current Sage 50 Payroll version

• Launch the Sage 50 Payroll.
• Choose the Help menu and click About.
• Now, review the Version Number below the Program Details.
• For the taxation year 2026-2027, you must use Sage 50 Payroll v32.

Steps to install the tax table update manually

• Visit the official Sage website to download and install Sage 50 Payroll v30.00.297.
• Now, start downloading the update on your computer.
• Exit the Sage 50 Payroll and other Sage applications open on your computer.
• Run the downloaded installer and follow the on-screen instructions.
• When the installation is complete, reopen the Sage 50 Payroll.
• Move to Help menu and click About. Then, confirm the required version installed.

Conclusion

Change a tax code in Sage 50 Payroll helps you to ensure accurate PAYE deductions and payroll compliance. It is advised to use HMRC tax code notices and review the date to process payroll. The personal allowance remains £12,570 for 2026/27 and the emergency tax code remains 1257L. So, no automatic tax code uplift is required.