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Tax code letters and numbers

Watch a video about what your tax code is and how it is used by your employer or pension provider.

You will learn about: 

• what the numbers in your tax code mean 
• your tax-free amount for the year 
• why there are letters in tax codes 

How tax codes work

Watch a video about how your tax code helps you pay the right amount of tax. 

You will learn about: 

• your tax code and tax-free amount 
• how your tax-free amount is used if you are paid weekly or monthly 
• different rates of tax and tax rate bands 
• how to estimate your income tax for the year 

Emergency tax codes

Watch a video about emergency tax codes, also known as temporary tax codes. 

 You will learn about: 

• W1, M1 and X tax codes 
• how emergency tax codes work 
• why you might have an emergency tax code 
• how long you will have an emergency tax code 

Changes that can affect your tax code

Watch a video about why your tax code might change. 

 You will learn about: 

• what changes can affect your tax code 
• income changes and your tax code 
• how your tax code helps you pay the right amount of tax 
• tax codes and additional sources of income 
• tax codes and company benefits 

Tax code changes and your pay

Watch a video to find out how tax code changes affect your pay. 

 You will learn about: 

• tax code changes when your tax-free amount increases 
• tax code changes when your tax-free amount reduces 
• tax code changes when you get a taxable company benefit 
• in-year adjustments to collect tax underpayments

Updating your details if your tax code is wrong

Watch a video about what you can do if your details are not up to date. 

 You will learn about: 

• your personal tax account
• automatic tax code changes
• when you can update your details
• updating your employment or pension details
• updating your existing income
• adding a missing company benefit 
• what happens when you update your details

Starting a new job without a P45

Watch a video about what information to give your employer if you do not have a P45.

Starting a new job without a P45)

You will learn about:

• finding your National Insurance number
• completing and previewing the starter checklist
• sending the starter checklist to your employer