You need to file a tax return if you earn any untaxed income over £1,000. Additionally, you’ll need to pay Income Tax and National Insurance if your total income exceeds £12,570 during the tax year. If you make more than £3,000 in capital gains, you’ll also owe Capital Gains Tax.

Most people in the UK don’t need to file a tax return because their tax is automatically deducted through PAYE. However, you may need to file a Self Assessment tax return if you:

• Are self-employed and earn more than £1,000 untaxed income
• Have any untaxed income over £1,000
• Want to claim a tax refund
• Are instructed by HMRC to submit a return
• Qualify for certain benefits

Payment on Account is a system where HMRC splits your tax bill into two payments, due on 31st January and 31st July. It’s typically for self-employed individuals. You’ll likely have Payment on Account if:

• Your tax bill is over £1,000
• Less than 80% of your tax is paid through your salary
• HMRC has told you that your tax bill will be split when you filed your return in January

The Income Tax rate depends on your income and which tax band it falls into. The four tax bands are:

• Up to £12,570: 0% (Personal Allowance)
£12,571 to £50,270: 20%
• £50,271 to £125,140: 40%
• Over £125,141: 45%

Tax efficiency refers to paying the least amount of tax required by law. It’s different from tax evasion, which is illegal. Tax efficiency involves strategic planning to minimize tax liabilities, often using allowances, deductions, and other legal means.

The tax on investment income depends on the type of income you receive. It may include Income Tax, Capital Gains Tax, or Dividend Tax, depending on the nature of your investment income.