What are the SA103F and SA103S forms?

The SA103 forms are supplementary tax return forms filling out details about your self-employment on your Self Assessment.

 

Which type of SA103 form do I need to fill out?

If you are self-employed and have relatively simple accounts and your turnover was below £85,000, you can fill out the SA103S form, the short version.

 

You should complete the full self-employment form (SA103F) if:

  •  your turnover was £85,000 or more (or would have been if you’d traded for a full year) 
  • you’ve changed your accounting date 
  • you’re claiming Overlap Relief 
  • your taxable self-employed period, or basis period, is not the same as your accounting period and the income for the basis period is more than £1,000 
  • you have adjustment income because you changed your accounting basis 
  • you were within the Managing Serious Defaulters (MSD) programme during the year 
  • you need to adjust any profits chargeable to Class 4 NICs 
  • you had, on 5 April 2019, an outstanding untaxed balance on a disguised remuneration loan arising from this self-employment, even if it ceased between 6 April 2018 and 5 April 2019, and have not entered into a full and final settlement with HMRC

How do I fill in the SA103 forms?

You can find the SA103S here, and the SA103F here. You may need to fill in a form for each business, even if you only have one set of accounts, or if you recently started or ceased in business or have changed your accounting date.

The HMRC also provides a detailed guideline for each line item on the forms. Guidelines can be found here:

How do I submit the SA103F AND SA103S?

You can submit both of these alongside your main tax return (SA100).

Do I need to use the SA103F OR SA103S if I file my tax return online?

No, you will only need to fill these out if you submit your tax return on paper.

We recommend filing online–it is much easier and the sections you need to fill out will automatically be supplied. You also get an extra three months to complete it. 

By using GoSimpleTax, you can make tax season easier.  Our user-friendly software will sort through the details you provide and show only the sections relevant to you, saving you time and hassle. Make tax season easy and start your free trial today!

Take the stress out of doing your tax return

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Automation and one-click shortcut integrations mean completing a self assessment with our software is a simple, quick and stress-free process.

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Step-by-step instructions

GoSimpleTax provides you with a clear step-by-step process which means your tax return will be submitted faultlessly and painlessly.

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Our analysis tools proactively gives prompts for claimable expenses that you may not have been aware of so you save money.

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Automatic calculations ensure your tax return is submitted accurately so you don’t have to worry about making mistakes.

Why GoSimpleTax?

GoSimpleTax is the quick and easy software solution to managing all of your Self-Assessment and accounting information.

But how much is GoSimpleTax?

From just £30 per year, you can save £££’s. We offer a no-obligation free trial which means you can get started free of charge today.

So cut the stress out of submitting your self-assessment and consider accounting software for a quick, accurate and effortless process.

£ 46 / TAX YEAR
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*Prices include VAT
Tax Return
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View Tax Calculation
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Download Form R40
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Self Assessment Categorisation
Basic Tax Return (SA100)
Employment (SA102)
Self Employment (SA103)
Partnership (SA104)
Property (SA105)
Ministers of Religion (SA102M)
Foreign (SA106)
Trusts (SA107)
Capital Gains (SA108)
Residency (SA109)
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£ 65 / TAX YEAR
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SA800 PARTNERSHIPS
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Partnership Tax Return (SA800)
Property Income (SA801)
Foreign Income (SA802)
Disposal of Assets (SA803)
Investments Income (SA804)
Auto populate partner’s SA104
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Non Subscription: From £115.00
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Multiple Return discount
2 Returns - £69.00
3 Returns - £92.00
4 Returns - £112.00
5 Returns - £125.00
6 Returns - £140.00
7 Returns - £148.00
8 Returns - £156.00
9 Returns - £158.00
10 Returns - £160.00
Additional Returns £1 Each
  
  
  
  
  
  
  
  
  
  
  
  
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See all pricing
£ 46 / TAX YEAR
Non Subscription: £77.00
*Prices include VAT
Tax Return
Submit Directly to HMRC
View Tax Calculation
Print your Tax Calculation
Download Form R40
Mobile App
Scan Receipts
Self Assessment Categorisation
Basic Tax Return (SA100)
Employment (SA102)
Self Employment (SA103)
Partnership (SA104)
Property (SA105)
Ministers of Religion (SA102M)
Foreign (SA106)
Trusts (SA107)
Capital Gains (SA108)
Residency (SA109)
FreeAgent
FreshBooks
QuickBooks
SumUp
Xero (beta)
Start your free trial
£ 65 / TAX YEAR
Non Subscription: £108.00
*Prices include VAT
SA800 PARTNERSHIPS
Submit Directly to HMRC
Partnership Tax Return (SA800)
Property Income (SA801)
Foreign Income (SA802)
Disposal of Assets (SA803)
Investments Income (SA804)
Auto populate partner’s SA104
Add partners at anytime
  
  
  
  
  
  
  
  
  
  
  
  
  
  
Start your free trial
Tax Return
Volume Discount
Non Subscription: From £115.00
*Prices include VAT
Multiple Return discount
2 Returns - £69.00
3 Returns - £92.00
4 Returns - £112.00
5 Returns - £125.00
6 Returns - £140.00
7 Returns - £148.00
8 Returns - £156.00
9 Returns - £158.00
10 Returns - £160.00
Additional Returns £1 Each
  
  
  
  
  
  
  
  
  
  
  
  
Start your free trial
Start your free trial