Don’t miss the deadline! The standard deadline is the 31st January following the tax year just finished. So for the tax year ending 5th April 2019, the deadline is 31st January 2020.
If you fail to file your self assessment on time you will receive a late filing penalty
Keep thorough records of your income and expenditure, including invoices and receipts were possible
Declare any charitable donations that you make
Keep a recode of any payments to a private pension fund
Don’t forget about payments on account. If you owe over a certain amount in tax when you file your self assessment, you will be required to make ‘payments on account’ which effectively accelerates your tax bill for the following year
Make sure you are using the correct tax code to avoid over/under paying
Ensure you declare all sources of income, and you transfer details of what tax you have already paid