How To You need to complete a self assessment tax return.

The form you use to submit your tax information in the United Kingdom is the Self Assessment tax return.You can submit it online or through the mail.Register yourself for an online self assessment if you're doing it online.You need to fill out the various sections about your income, benefits, and tax relief.Before you submit the whole thing and get your tax bill, you may need to fill in additional forms.

Step 1: If you didn't send in a tax return last year, register this year.

If you filed a tax return last year, you may already be registered.You need to register again this year if you didn't send in a self-assessment form last year.If you registered in the past and received a return last year, you can find the Unique Taxpayer Reference number.When filing online, you will use this number.It's sometimes referred to as the tax reference.Look for the number on a previous return if you don't have it written down.It will be on the documents you receive.You can find your login information in your online account if you know it.If you can't find it, call the helpline.The main numbers are from the UK or outside the country.

Step 2: To register, fill in and submit the correct form.

Don't register as a partnership or self-employed.You need to pick the right form for each category based on your status.If you're self-employed, you need to use one of the forms on this page.If you're not self-employed, you can use the form on this page.If you're in a partnership, you can use a form from this page.

Step 3: The form can be submitted online or in the mail.

The registration form can be submitted online.If you prefer, you can fill out the form and mail it in.You can mail it to the address above.

Step 4: The self-assessment form requires documents.

When filling out your tax return, you'll need the documents mailed to you by your employer, such as your P60 (End of Year Certificate), P11D (expenses or benefits), or P45 (Details of employee leaving work) payslips.You will need the P2 as well.You'll need your profit and loss statement if you're self-employed.Investment brokers' schedules, building society passbooks, and personal pension contributions certificates are some of the items you'll need.Take your bank statements with you.

Step 5: You can check and enter your personal information.

Basic information, such as your name, address, and birthday, should be on your application if you have a registered account.Leave them as they are if these are correct.Correct them if they're wrong.You can write the correct address in the print form if you cross out the address.

Step 6: The "yes" or "no" questions are about your income.

Questions about your employment, partnerships, property, capital gains, and so on can be found on this page.Give a "yes" or "no" answer to the questions.You should fill out the forms in the supplementary documents if you answer "yes" on some of them.

Step 7: You can get income from interest or dividends.

You can add interest from banks in this section.You should put in any dividends you received from UK companies.Non-cash interest is included in this section.Don't add interest from Savings Certificates, Individual Savings Account, or Save as You Earn schemes.You don't have to pay interest on the damages you received in the UK court.

Step 8: UK annuities and pensions are state benefits.

The UK state benefits are the next part of the income section.The section includes annuities, pensions, and Jobseeker's allowance.You can put the amount of taxes taken off in different boxes.You can find your state pension income by looking at the letter you received in the mail.

Step 9: You can also fill in income from the UK.

Box 17 is for other types of income.In this area, you have a box to fill in, which is the amount you spent to get the job done, not including capital items, such as laptops.Box 17 is used for property income distributions from real estate investment trusts.Pre-owned assets that you benefit from need to be filled in as well.

Step 10: You can enter your payments to pensions.

You can get some relief on paying taxes if you add the amounts you contributed to pensions and annuities.Only the amount you contributed is entered.You should pay attention to the limit for how much you can claim.For most pensions, that is the amount you make in a year.For a relief at source scheme, you can only put in up to 3,600 gross.

Step 11: Next, place charitable gifts.

You can get tax relief for donating money to charities.Money amounts, land and building donations, shares and securities donations and donations to foreign charities are part of this area.

Step 12: There is a section on the blind person's allowance.

If you are blind, you should include the name of a local authority or register who verified it.Write in "Scotland" or "Northern Ireland" for your local authority in Scotland or Northern Ireland.If you want your partner to receive your surplus, check the box.If you don't have enough income to use all of your surplus income, your spouse will get it.

Step 13: The information on student loans should be filled in.

The UK government will figure out what you owe if you tell them you've been asked to pay your Income Contingent Student Loans back.If your employer has already taken out a certain amount, fill it in.

Step 14: As needed, add information to the High Income Child Benefit Charge.

If your income is over £50,000 for the year, you can enter how much you received in child benefits.If your income is higher than your spouse's, enter it.

Step 15: If you qualify, use the Marriage Allowance.

If your spouse's income was less than yours, you can allow them to use part of your Personal Allowance.The amount of taxes they owe is reduced by this allowance.For this credit, you and your spouse must have been married for the full year, and you must be born after April 6, 1935.

Step 16: Information about tax refunds should be included.

Put in the amount that you received a refund last year.If you didn't pay enough last year, you need to give the government permission to make up for it with this year's taxes and pensions.If you paid too much, you should put in your bank information to get a refund.

Step 17: The tax preparer's name should be placed at the end.

You need to include the person's biographical information if you used a tax preparer.You will need their address, phone number, and ID number.

Step 18: You need to fill out more documentation.

There are more than 20 supplementary documents that apply to special situations.You can check the list to see which ones apply to you.The first page of your self assessment should give you an idea of the supplementary forms you need to fill in.The SA102 is for employment.The form can be found at www.gov.uk/self-assessment-forms-and-helpsheets.Supplementary forms are for self-employment.The forms can be found at www.gov.uk/self-assessment-forms-and-helpsheets.The forms include parliament, partnerships, foreign, trusts, Scottish Parliament, The National Assembly of Wales, and capital gains summary.

Step 19: If you're using paper, you have until October 31 to file your return.

You must mail in your return by October 31 if you're filing on paper.You'll have to pay a penalty if you don't make it in time.Mail it to the self assessmenthm revenue and customs address

Step 20: If you're filing online, you have until January 31 to file your return.

You have an extension if you choose to file your return online.You can submit it by January 31 instead of October 31.

Step 21: You have to pay your tax bill.

When you submit your tax form, the government will figure out how much you owe and send you a tax bill.CHAPS can be used to pay online, at your bank or building society, through direct debit, or through a check in the mail.Within 3 days of you submitting your return, your tax bill will show up online.