Self Assessment
Tax Year: 2024/25
Includes HMRC submission and confirmation.
Answer simple questions about your income and we'll handle the forms. Real-time tax calculations, plain English guidance, and direct HMRC submission β no accountant needed.
No payment required until you submit to HMRC
Most users complete their return in under an hour
Self-employed, a landlord, or running a company? Tell us your situation and we'll set up the right return.
Work at your own pace with plain English explanations throughout.
We highlight anything that needs attention before you submit.
Secure submission with instant confirmation and receipt.
SubmitFox supports all major UK tax filings
Join thousands of UK taxpayers who file with confidence using SubmitFox
Four simple steps from start to submission. No accountant needed.
Self-employed or a landlord? We'll ask about your income. Running a limited company? We handle that too. Not sure which return you need? We'll help you decide.
Plain English guidance, real-time calculations, and smart validation. Save anytime and return when ready.
We highlight missing info and common errors. Download a summary PDF to review before submitting.
Secure direct submission. Instant confirmation and receipt. 12 months access to amend if needed.
Everything you need to file with confidence
Every field explained clearly. No jargon, no confusion.
See your tax liability update as you enter figures.
256-bit encryption. GDPR compliant. Your data is protected.
Official MTD-compliant software for direct submission.
Create your free account and complete your return at your own pace
Start free. Pay only when you're ready to submit.
Per quarterly return β’ MTD compliant
Per tax year β’ complete Self Assessment
Per accounting period β’ Corporation Tax
Free to start & complete
Plain English guidance
Real-time calculations
Secure HMRC submission
Instant confirmation
12 months access
Create your free account and complete your return before paying
Whether you're a freelancer filing your first return or a company director managing multiple tax obligations, SubmitFox makes UK tax filing simple.
Working for multiple clients? Juggling invoices and expenses? SubmitFox helps you file your Self Assessment accurately and claim every allowable deduction.
Running your own business as a sole trader? SubmitFox guides you through your Self Assessment with plain English explanations and automatic calculations.
Rental income from buy-to-let, Airbnb, or holiday lets? We help you report your property income correctly and claim all allowable expenses.
Made money from shares, crypto, or other investments? We help you calculate and report your capital gains, dividends, and investment income correctly.
Making money from YouTube, Etsy, Depop, or other side projects? If you earn over Β£1,000, you may need to file a tax return. We make it simple.
Running a limited company in the UK? File your Corporation Tax return online with full accounts generation included.
Need to file your MTD VAT return? SubmitFox is fully compliant with Making Tax Digital and connects directly to HMRC.
Create your free account and start filing with confidence today
Stay on track. We'll guide you through every step.
VAT, Self Assessment, or Corporation Tax β we'll guide you through every step.
Choose the type of return you need to submit to HMRC
Company director who takes a salary or dividends? You'll need both Corporation Tax (for your company) and Self Assessment (for your personal tax). Start with Corporation Tax β you'll need those figures for your personal return.
You'll only pay when you're ready to submit
Select the period you're filing for
Period ending 31 March 2025
Complete your return at your own pace. No payment until everything is ready.
Your progress is saved securely
This allows SubmitFox to send your completed return securely to HMRC.
Please check all details are correct before proceeding to payment.
Review your details below before proceeding.
Your return won't be submitted until you pay and confirm
Your return will not be submitted until payment is complete.
Includes HMRC submission
Your return will only be sent to HMRC after you connect and confirm.
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Your return is complete and payment confirmed. Click below to submit to HMRC.
Once submitted, you can only make changes by filing an amendment.
Your return has been sent to HMRC.
What happens next?
Enter your VAT registration and business information.
Enter your VAT return figures. Choose how you'd like to provide your data.
Your VAT return boxes calculated from your digital records.
Add any adjustments or corrections to previous returns.
Review your VAT return before submission to HMRC.
IRmark Digital Signature
Correlation ID:
Enter your personal information for the Self Assessment return.
Select the types of income you need to declare and enter amounts.
Enter the details for each income type you selected.
Review your Self Assessment return before submission to HMRC.
IRmark Digital Signature
Correlation ID:
Enter your company information and accounting period.
Prepare your company accounts for submission to HMRC and Companies House.
Calculate your taxable profit by adjusting your accounting profit for tax purposes.
Select and complete any applicable supplementary schedules.
Complete the supplementary schedules you selected.
Review your Corporation Tax return before submission to HMRC.
IRmark Digital Signature
Correlation ID:
| Date | Return Type | Period | Reference | HMRC Status | CH Status | Actions |
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When you submit returns to HMRC or file accounts with Companies House, your receipts will appear here.
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Your personal tax filing assistant