Submit Your Tax Return
Once you have made all the
adjustments to your self-employment and property income and expenses
, you will need to use Calceum to complete and submit your tax return.
You must submit your tax return by 31 January following the end of the relevant tax year, but you can submit it earlier than this. For example, you can submit your tax return for the 2025 to 2026 tax year any time after 6 April 2026, but you must submit it by 31 January 2027.
If you miss the deadline for submitting your tax return, you will be liable for a late submission penalty point.
Add your other sources of income and gains
You need to make sure all your other taxable sources of income or gains for the year are included in Calceum before submitting your tax return.
For Making Tax Digital for Income Tax, different information about your other income sources will be added by you and by HMRC. You need to check that all information added is correct.
Information HMRC will add
If HMRC already has information about your other sources of income and gains, they will add this into your tax return. This includes:
- Employment (PAYE) income
- Student loan repayments
- Income from state, private and occupational pensions
- Other taxable state benefits
- Construction Industry Scheme (CIS) — subcontractor deductions
- Capital Gains Tax residential property disposals
- Marriage Allowance claims
After HMRC have added this information, you can find it in Calceum when you request a tax calculation, or in your HMRC online services account.
Information you will add
You still need to add other income sources into your tax return if you have not added them during the tax year and you need to declare them. For example:
- Savings income
- Your share of profit from a partnership as an individual partner
- Dividends (including those from your own company)
- Any other income or gains that have not been automatically added
You need to add this information before you submit your tax return.
Check your information
Before you submit your tax return, check that the information added by you and HMRC is correct.
If something is incorrect or you need to update it, you can add the correct information in Calceum, and this will overwrite the previous information.
Your information is only treated as final once you have submitted your tax return.
Submit your tax return
You need to submit your tax return through Calceum. You need to confirm that:
- You’re ready to submit your return
- You agree with the calculation given for tax due
You will also need to declare that the information you have provided is correct and complete to the best of your knowledge.
You should only do this after you’ve added all of your income sources and gains, and checked that all of your information is correct.
Steps to submit
- Go to Tax Return in Calceum and confirm you’re ready to submit your tax return
- View the calculation that shows you the amount of tax due
- Check the calculation is correct
- Submit your tax return by declaring that your information and calculation is correct
You’ll then see a message in Calceum to confirm your tax return has been submitted.
If you disagree with the calculation or there is an error
You should check the information you’ve added in Calceum. If there is an error, you can correct it before you submit your tax return.
If Calceum does not give you a calculation when you request one, there may be an error. Check that all required information has been entered correctly. If you need assistance, contact our support team.
After you have submitted your tax return
If you need to correct or include something else, you can amend your return.
The information you give to HMRC will generate your Self Assessment tax bill for that tax year.
Making Tax Digital for Income Tax will not change the way you pay tax or the dates that payments are due. If you do not pay your Self Assessment tax bill by the relevant deadlines, you will be liable to pay a late payment penalty.