If you want to file your German income tax return online, you will almost certainly need ELSTER. The tax administration's free portal is the official route for submitting tax returns electronically to the Finanzamt. Yet many people get stuck right at the start: the login does not work as expected, the certificate file has disappeared, or the password simply will not come to mind.
This article explains in plain terms how the ELSTER login works, which sign-in options exist, and what to do when something goes wrong. It also shows when you can skip the effort entirely – because an income tax assistance association (Lohnsteuerhilfeverein) such as lexo.tax can prepare the return for you within a membership.
What is ELSTER?
ELSTER stands for "Elektronische Steuererklärung" (electronic tax return) and is the official online tax office of the German tax administration. At www.elster.de it bundles the digital services of all Finanzämter. In the protected area "Mein ELSTER" you can prepare your income tax return, upload documents and send everything electronically to your Finanzamt.
The key difference to other online services: with ELSTER you cannot simply sign in with an email address and a password. For security reasons you need additional proof of your identity – just like your signature on a paper return. That is exactly why the first login is more involved than on an ordinary website.
Prerequisite: the ELSTER certificate
Before you can log in for the first time, you must register once. At the end of this registration you receive your personal ELSTER certificate. This certificate is the key to your account – it identifies you clearly towards the Finanzamt and replaces your handwritten signature.
The first registration roughly works like this:
- Go to www.elster.de and click "Benutzerkonto erstellen" (create user account).
- Enter your details (name, email address, tax identification number).
- You receive an activation ID by email and – with a deliberate delay for security reasons – an activation code by post.
- With both codes you complete the registration and receive your certificate.
Allow some patience here: because the activation code arrives by letter, the full registration usually takes a few days up to around two weeks. If you are close to the filing deadline, factor that in.
The login options at a glance
Once registration is complete, several ways to sign in to "Mein ELSTER" are available.
1. Login with the ElsterSecure app (recommended)
ELSTER now recommends the free ElsterSecure app as the most convenient and secure login method. You download the app from the App Store or Google Play Store and set up your user account on your smartphone once.
To sign in, click Login on the website, choose the ElsterSecure option and scan the QR code shown with the app. The advantage: you do not have to remember a file or look for a storage location – your access sits securely on your phone, roughly as convenient as online banking.
2. Login with the certificate file
The classic option is signing in with a certificate file. You downloaded this file at the end of registration and saved it on your computer. You will usually recognise it by the file extension .pfx; depending on your system or a renewal, .p12 can also occur.
How to sign in with it:
- Go to www.elster.de and click Login.
- Choose "Andere Login-Optionen" (other login options) and then "Zertifikatsdatei" (certificate file).
- Click "Auswählen" or "Durchsuchen" and open your certificate file.
- Enter the matching password and click Login.
Important: for every future login you always need both – the certificate file on your computer and the password you chose. Keep both carefully.
3. Further options
For users with higher security requirements there is also a login via security stick or signature card. For most employees these variants are not necessary.
Common login problems – and how to solve them
This is where many people stall. The good news: for almost every problem there is a way back into the account.
Password forgotten or certificate file lost
This is the most common stumbling block – and unfortunately not solved with a simple "reset password". Without the certificate file or the matching password you cannot access the account, because together they form your security key.
The way out is renewing your access ("Zugangserneuerung"): on the ELSTER login page you will find an entry along the lines of "certificate file lost or certificate expired? password forgotten?". There you enter your email address and your user name and receive – as during the first registration – new activation data: an activation ID by email and an activation code by post. With these you download a new certificate file and regain access to your existing account. Again, the postal route costs a few days.
Certificate expired
An ELSTER certificate is valid for three years. So that you do not miss the expiry, ELSTER notifies you automatically around 90 days before by email. Then log in as usual and follow the instructions – the new certificate is created and your account remains fully usable. You should delete the old, expired file afterwards to avoid mix-ups.
Cannot find the file at all
Search your computer specifically for files with the extension .pfx or .p12 – there are usually very few of them. Check your downloads folder as well. If you cannot find the file any more, the only route left is the access renewal described above.
The login works – and then the real work begins
Once you are in the account, the difficult part starts: the tax return itself. ELSTER is a free tool for the pure submission. What it does not do for you is answer the substantive questions: Which costs can I deduct? Which lump sums am I entitled to? Have I thought of everything?
ELSTER calculates – but it does not advise. For non-experts the forms are often hard to understand, and precisely with topics such as home office, commuting costs, tradesperson services or checking the tax assessment, money is quickly left on the table if you do not know the rules.
The simple route: lexo.tax takes care of it
This is where lexo.tax comes in – a recognised Lohnsteuerhilfeverein based in Rosenheim. As an association we may advise members on their tax matters within the statutory scope of § 4 no. 11 StBerG and prepare their income tax return.
The difference for you: you do not have to deal with the ELSTER login, certificate files or confusing forms. You submit your documents digitally, we take care of the rest.
What the membership includes:
- A fixed contact person, all year round – the same adviser, permanently.
- A digital process – documents by upload, appointments by video call or in person in Rosenheim.
- Assessment review included – every tax assessment is checked; appeal proceedings and communication with the Finanzamt are covered by the membership fee.
- Income-based fees – EUR 59 basic fee per year, capped at EUR 429, plus a one-off admission fee of EUR 15 in the year you join. Married couples filing jointly pay only one fee. Details in our fees.
- An audited association – member of the ZVL, certified to DIN 77700, supervised by the Bavarian State Tax Office.
Good to know – new rules from September 2026: with the extension of the advisory scope for Lohnsteuerhilfevereine, the income limits for rental income and investment income will no longer apply. The new rules apply from 1 September 2026; until then the previous limits remain in force. Excluded types of income and circumstances still have to be observed.
→ Start the free eligibility check – a non-binding pre-check of whether your tax situation falls within our statutory advisory scope. No membership yet, no cost.
Do it yourself in ELSTER or get help? An honest assessment
For simple cases – for instance an employment relationship without special features – ELSTER can be perfectly sufficient. As soon as things become complex, or you want to be sure you are not giving anything away, professional support is worthwhile.
The honest limit matters to us: as a Lohnsteuerhilfeverein we advise employees, pensioners and retirees. For income from a trade or business (§ 15 EStG) or self-employment (§ 18 EStG), for bookkeeping, annual accounts, trade tax or VAT, a tax adviser (Steuerberater) is the right address.
Frequently asked questions about the ELSTER login (FAQ)
Is the ELSTER login free of charge? Yes. Both the registration and the use of "Mein ELSTER" are free of charge. It is the official service of the tax administration.
How long does registration with ELSTER take? Because part of the activation data is sent by letter, expect a few days up to about two weeks. Shortly before the filing deadline this is tight – register early.
Do I necessarily need a smartphone for the login? No. The ElsterSecure app is the recommended method, but you can always sign in with the certificate file on your computer instead.
How often do I have to renew the certificate? The certificate is valid for three years. ELSTER reminds you automatically around 90 days before expiry by email.
Can I have my tax return prepared without my own ELSTER login? Yes. If you do not want to deal with logins and forms yourself, lexo.tax can prepare and submit the return within a membership – inside the statutory advisory scope of § 4 no. 11 StBerG.
What do I do if the login does not work at all? First check whether you are using the correct certificate file and the matching password. If it still does not work, use the access renewal on the login page to obtain new access data.
Book a free initial call – get informed first, then decide.
Note This article serves as general information and was carefully created by the Lexo.Tax editorial team. Personal tax advice can only be provided within the framework of a membership with Lexo.Tax – and exclusively to the legally permitted extent according to § 4 no. 11 StBerG.