English to Portuguese Bus/Financial Law: Taxation & Customs impostos, fiscal, tributário

File your Self Assessment tax return online
You can file your Self Assessment tax return online if you:

are self-employed
are not self-employed but you still send a tax return, for example because you receive income from renting out a property
This service is also available in Welsh (Cymraeg).

You can also use the online service to:

view returns you’ve made before
check your details
print your tax calculation
https://www.gov.uk/log-in-file-self-assessment-tax-return
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Self Assessment tax returns
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Contents
Overview
Who must send a tax return
Registering and sending a return
If you no longer need to send a tax return
Deadlines
Penalties
If you need to change your return
How to get help
Returns for someone who has died
Who must send a tax return
You must send a tax return if, in the last tax year (6 April to 5 April), any of the following applied:

you were self-employed as a ‘sole trader’ and earned more than £1,000 (before taking off anything you can claim tax relief on)
you were a partner in a business partnership
you had a total taxable income of more than £100,000
you had to pay the High Income Child Benefit Charge
You may also need to send a tax return if you have any untaxed income, such as:

some COVID-19 grant or support payments
money from renting out a property
tips and commission
income from savings, investments and dividends
foreign income
Check if you need to send a tax return
You can check if you need to send a tax return if you’re not sure.

You must tell HMRC by 5 October if you need to complete a tax return and have not sent one before. You can tell HMRC by registering for Self Assessment.

Other reasons for sending a return
You can choose to fill in a tax return to:

claim some Income Tax reliefs
prove you’re self-employed, for example to claim Tax-Free Childcare or Maternity Allowance