Another mistake when it comes to Self Assessment is a failure to keep records, as well as issues with accuracy.
Mr Parkes added: “It’s imperative that you keep all relevant documentation, so you can provide the most accurate information about untaxed income and expenses relating to those earnings.
“These include expenses records, benefits, bank statements, property income, Capital Gains and P60/P45/P11D.
“When it comes to Self Assessment, it’s all about being accurate.
“Make sure you declare everything, in full, such as income from employment, Capital Gains, dividends and employee share schemes.