When you log in to MyTax, your tax-related letters will change from paper to electronic form automatically. Read more about the changes.
If your permanent home’s electricity bills were high in January–April 2023, you can gain a tax credit for electricity in your 2023 taxation. If the conditions for the tax credit are met but you have not claimed the credit on your 2023 tax return, you can file a claim for adjustment with the Assessment Adjustment Board.
File the claim for adjustment in MyTax. If you cannot use MyTax, you can use a paper form or authorise another person to act on your behalf.
Choose your filing method
Please note that MyTax does not contain numbered forms, such as Form 14D. If you want to claim a tax credit for electricity, file a claim for adjustment for the year 2023 and select “credit for household expenses” as the subject of the claim.
See the instructions: Claim for adjustment of income tax – individuals
File the claim for adjustment on the form Claim for adjustment of income tax – individuals. Fill in Form 14D Tax credit for electricity and attach it to your claim for adjustment.
Send your claim for adjustment to (please return both forms to this address):
Finnish Tax Administration
P.O. Box 650
FI-00052 VERO
Download the form
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The online authorisation mandate
You can use the feature called “Suomi.fi Authorization” to enable you to deal with another person’s taxes through e-services, over the telephone, or by visiting a service point on their behalf.
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Letters of authorisation on paper
You can receive a letter of authorisation from the other person. It will enable you to deal with that person’s taxes on the telephone, by visiting a service point on their behalf, or by submitting information on paper tax forms. To have a letter of authorisation (often called a ‘power of attorney’) does not provide access to MyTax.
Letter of authorisation for tax representation of individual taxpayers (3818)
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When is there no need for an authorisation mandate?
The following circumstances are examples of when you can deal with someone else’s taxes with no authorisation.
You have child younger than 18 and you handle the child’s taxes
You are automatically authorised to access MyTax for the child, without an authorisation. Log in to MyTax and select “Act on behalf of someone else”.
Read more about this subject on Suomi.fi
You are a guardian
You do not need a Suomi.fi authorisation when your continuing power of attorney for being a guardian is officially confirmed, or when you are registered as a private guardian. Log in to MyTax and select “Act on behalf of someone else”.
Note: If you are a public guardian, in other words, a public official employed by a public guardianship office, you can only use paper forms.
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Key terms:
Page last updated 3/11/2025