How to claim SEIS tax relief

When you invest in SEIS, you can receive up to 50% income tax and capital gains tax relief. 

But how do you go about claiming the tax relief in practice? 

Below we give a simple step-by-step guide, which you can use as a starting point, although it is not tax advice or a personal recommendation. Tax rules change and benefits depend on circumstances. If you're in doubt, you may want to seek advice from an accountant. 

What you need to have on hand to claim SEIS tax relief

You will normally claim SEIS tax relief when you complete your tax return. You will be asked some information which is included in your SEIS3 certificates. 

These are certificates you receive from each of the companies you invested in, typically a few months after the investment. If you invested in a fund, you will typically receive one SEIS3 form for each of the underlying companies. 

The SEIS3 certificates contain the information you will need: 

  • The name of the company in which you have invested 
  • The amount you have subscribed and on which can claim tax relief
  • The date the shares were issued (this is usually different from the date you invested)
  • The name of the relevant HMRC office and its reference

What you do next will depend on how you submit your tax return (by post or online). There is also an alternative method to be used in certain circumstances, for instance, if you do not wish to claim tax relief for the same tax year for which you're submitting the return or if you don't habitually file a tax return.  

How to claim SEIS tax relief on your paper tax return

  • You will need to complete the "Additional information" sheet (form Sa101) and enclose it with your return. 
  • In box 10 of the "Other reliefs" section, on page Ai 2, please write the total amount of all your SEIS subscriptions on which you wish to claim tax relief.Other tax reliefs – Box 10 SEIS
  • In box 21 of the "Additional information" section, on page Ai 4, please give details of each of your SEIS investments, including the names of the companies, the subscription amounts, the dates when the shares were issued, the names of the relevant HMRC offices and their reference.Additional information – box 21 EIS
Please note, HMRC doesn't require you to submit the SEIS3 certificates for the investments on which you are claiming tax relief. It might, however, ask you to produce them, so please ensure you keep them safe.  

Tax relief claimed via your tax return will reduce the amount of tax you will have to pay. If you have already paid too much income tax, the excess can either be repaid by cheque or directly into your bank account. 

How to claim SEIS tax relief in your online self-assessment form

  • You will need to answer "Yes" to the question on other tax reliefs in section 3, "Tailor your returnTailor your return - EIS
  • In section 4, "Fill your return", you will have to type the total amount of all your SEIS subscriptions on which you wish to claim tax relief and provide details of each of your EIS investments. Details include the names of the companies, the subscription amounts, the dates when the shares were issued, the names of the relevant HMRC offices and their reference.Fill your return – SEIS

Please note, HMRC doesn't require you to send the SEIS3 certificates for the investments on which you are claiming tax relief. It might, however, ask you to produce them, so please ensure you keep them safe.  

Tax relief claimed via your tax return will reduce the amount of tax you will have to pay. If you have already paid too much income tax, the excess can either be repaid by cheque or directly into your bank account. 

Alternative way to claim SEIS tax relief 

There is also an alternative way to claiming SEIS tax relief. You could complete the claim form you receive – it's on pages 3 and 4 of the SEIS3 – and send it to your HMRC tax office.

There are some circumstances when you should use this method. These include:

  • If you want to claim the tax relief against a previous year. This could be the case if you wish to use 'carry back' or if you didn't receive your SEIS3 certificate in time for the tax return deadline. 

  • If you pay tax via PAYE and want to receive the tax relief through an adjustment of your tax code – this might be an option if you have invested in SEIS and received your SEIS3 certificate early in the tax year. You will also have to enter details of the claim when you file your tax return. 

  • If you want to claim capital gains reinvestment relief as well as income tax relief.

In addition, you could use this method if you don't habitually file a tax return, for instance, if all of your tax is paid at source through PAYE.

As mentioned above, this is not tax advice. If in doubt, please consult HMRC's full guidance on the subject, or speak to your accountant. 

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