Tax return deadline extension 2026 — § 109 AO application

CostsFree of chargeThe Fiscal Code provides for no fee

Processing timeDepends on the competent authority§ 109 AO contains no deadline for a decision

MethodInformal — ELSTER, post, fax or phoneWritten evidence strongly recommended

Required documents

What your application must contain

There is no official nationwide form for an extension of the time limit: § 109 AO prescribes neither a form nor a specific content. In practice, however, it is exactly this content that decides whether the Finanzamt can process your request without a query. The following details therefore belong in every application — if they are missing, the caseworker must ask, and the original deadline continues to run unchecked in the meantime.

Informal application for an extension of the time limit

A short letter, a message via “Mein ELSTER” or a phone call is legally sufficient, because § 109 AO prescribes no form. Because in case of a dispute you must show that the extension was granted and until when, you should submit the application in writing or electronically and keep a copy. A template you can simply copy is given further below in the Step by step section.

Steuernummer or Identifikationsnummer

The tax number (Steuernummer) appears on every tax assessment notice and on the request to file the return; it assigns your application to the correct file. If no Steuernummer has yet been allocated — for example for a first return — state the eleven-digit Identifikationsnummer (tax identification number, Steuer-ID, IdNr.), which remains valid for life. Without one of these numbers, the application cannot be assigned and is left unprocessed.

Statement of the assessment period

State explicitly the year for which you need more time, for example “income tax return 2025”. An extension of the time limit always applies only to the assessment period named and never generally to all open years. If several years are affected by the same bottleneck, apply for the extension for each year explicitly in the same letter.

A specific requested date

Apply for the extension “until [date]” rather than “for some time”. A specific end date makes the discretionary decision under § 109 Abs. 1 AO easier and makes the approval clearly verifiable. Choose the date realistically: a second extension is scrutinised considerably more critically than the first, because one has already been granted.

Statement of reasons for the application

Describe concretely why the deadline cannot be met: an outstanding service charge statement, missing donation receipts or tradesmen’s invoices, illness, an extended stay abroad, a devolution of an inheritance, a move, or an ongoing external audit (Betriebsprüfung). Because the extension is at the Finanzamt’s discretion, the quality of the statement of reasons determines success. Generic wording such as “for reasons of time” is, by experience, not enough.

Evidence to support the reasons, where available

Evidence is not required by law, but considerably strengthens the application — for example a certificate of incapacity for work, a hospital discharge letter, your employer’s confirmation of posting abroad, or your written request for missing documents from a third party. Always submit copies and keep the originals. In advised cases under § 109 Abs. 2 AO, evidence is especially important, because the absence of fault must be demonstrated there.

Power of attorney if someone represents you

If a tax consultant, a Lohnsteuerhilfeverein (wages tax assistance association) or a relative submits the application on your behalf, the power of attorney must be evident. For professional representatives, the electronically transmitted power of attorney is generally sufficient; otherwise enclose a written tax consultant’s power of attorney. Without evidence of this, the Finanzamt must not provide information, because of tax secrecy under § 30 AO.

ELSTER access for the electronic application

Via “Mein ELSTER” you send the application as “Sonstige Nachricht an das Finanzamt” (other message to the Finanzamt); for this you need a user account and your certificate file with PIN. The transmission log at the same time serves as evidence of the content and timing of the application. Registering with ELSTER takes a few days, because the activation code is sent by post — allow for this lead time before the deadline expires.

Step by step

How to proceed

The route to an extension of the time limit consists of eight steps. The first three decide whether you need an application at all and which legal standard applies to you — both of these are most often skipped in practice and lead to avoidable refusals.

1
Check whether you are obliged to file at all
An extension of the time limit is only needed by those obliged to file. The obligation follows from § 149 Abs. 1 Satz 1 AO in conjunction with the individual tax acts; for employees, § 46 Abs. 2 of the Income Tax Act (Einkommensteuergesetz, EStG) lists the cases of mandatory assessment — for example secondary income above the allowance, tax-free wage replacement benefits such as sickness benefit (Krankengeld), parental allowance (Elterngeld) or Kurzarbeitergeld (short-time working allowance), the tax class combination III/V, or a registered wage tax allowance. If, on the other hand, you file voluntarily (income tax assessment on request), there is no filing deadline that would need extending, and no late-filing penalty either. Check this first: an unnecessary application only costs you time.
2
Determine the deadline that applies to you
Without tax advice, § 149 Abs. 2 AO applies: seven months after the end of the calendar year, so generally 31 July of the following year. If this day falls on a Saturday, Sunday or public holiday, the deadline ends only at the end of the next working day (§ 108 Abs. 3 AO). In concrete terms, this means: the deadline for the 2025 assessment period ended on Friday, 31 July 2026, and has therefore already expired; the deadline for the 2026 assessment period does not end until Monday, 2 August 2027, because 31 July 2027 is a Saturday. If your return is prepared by a tax consultant or a Lohnsteuerhilfeverein, § 149 Abs. 3 AO extends the deadline automatically to the last day of February of the second following year: for 2025 until 1 March 2027, because 28 February 2027 is a Sunday, and for 2026 until 29 February 2028.
3
Check the correct standard: § 109 Abs. 1 or Abs. 2 AO
For unadvised cases under § 149 Abs. 2 AO, the extension is at the Finanzamt’s free discretion (§ 109 Abs. 1 AO) — a plausible, demonstrable reason is generally enough. For advised cases under § 149 Abs. 3 AO, the bar is considerably higher: under § 109 Abs. 2 AO, an extension beyond the February deadline may only be granted if the taxpayer is or was prevented, without fault, from meeting the deadline for the tax return. Mere work overload at the tax consultant’s firm generally does not meet this standard; what must be shown are obstacles for which the taxpayer is not at fault such as serious illness, fire or water damage in the accounts department, or documents that do not arrive from abroad despite having been requested. Anyone who knows this difference frames the statement of reasons appropriately from the outset.
4
Draft the application
Write briefly but completely: name, address, Steuernummer, assessment period, the desired new date and the statement of reasons. State the date specifically and, in the same letter, ask in the alternative for a shorter extension — this increases the chance of a partial approval instead of an outright refusal. Explicitly ask for written notice of the decision, so that you hold evidence of it. A template letter that you only need to fill in is given directly below this list.
5
Submit the application in good time
The fastest route is via “Mein ELSTER” → “Nachrichten” (messages) → “Sonstige Nachricht an das Finanzamt”; you immediately receive a transmission log with date and time. Alternatively, send the application by post or fax to the tax office of residence (Wohnsitzfinanzamt) competent for you (§ 19 AO). Telephone applications are permitted, because § 109 AO prescribes no form; in that case note the date, time and the name of the contact person, and ask for written confirmation. Submit the application several weeks before the deadline if possible — if you send it by post shortly before the cut-off date, you risk the application only reaching the file after the deadline has passed.
6
Wait for the express approval
§ 109 AO has no deemed-approval rule: if the Finanzamt does not respond, the deadline is not treated as extended. There is no statutory deadline for the decision; how long processing takes depends on the competent authority. If you still have no answer shortly before the original deadline expires, call to ask, have the processing status given to you, and record the information with date and name. When in doubt, the safest option applies: file the return as a precaution anyway — a return already filed can still be corrected later.
7
Respond correctly to a refusal
The refusal is an administrative act; an objection (Einspruch) against it is admissible under § 347 Abs. 1 Nr. 1 AO, within one month of notification (§ 355 Abs. 1 AO). The Einspruch does not, however, remove the obligation to file — file the return in parallel as quickly as possible, otherwise the months towards a possible late-filing penalty continue to run. If the original deadline has already passed, two safety nets remain: the retroactive extension under § 109 Abs. 1 Satz 2 AO, and the restoration of the status quo ante (reinstatement after a missed deadline) under § 110 AO. You should apply for and give reasons for both explicitly; the Finanzamt does not consider them of its own motion in your favour.
8
File the return within the extended deadline
The approved deadline is also binding. Under § 109 Abs. 3 AO, the Finanzamt can attach ancillary provisions to the extension, for example a reservation of revocation or a condition to submit certain documents by an interim date — observe these conditions exactly. Then submit the tax return electronically, to the extent you are obliged to do so. Keep the approval until you receive the tax assessment notice: it is your evidence that a late-filing penalty does not have to be imposed under § 152 Abs. 3 Nr. 1 AO.

Template letter: informal application for an extension of the time limit

Replace the square brackets with your own details. For electronic submission, copy the text into “Mein ELSTER” under “Sonstige Nachricht an das Finanzamt”; for the postal route, a one-page letter with date and signature is sufficient.

To the Finanzamt [town]
[street, PLZ (postcode) town]

[Your given name and surname]
[Your street, PLZ (postcode) town]
[Town, date]

Steuernummer: [your Steuernummer] · Identifikationsnummer: [eleven digits]
Subject: Application for an extension of the deadline for filing the income tax return [year]

Dear Sir or Madam,

I hereby apply for the deadline for filing my income tax return for the assessment period [year] to be extended under § 109 Abs. 1 AO until [requested date].

Reason: [specific reason, for example: “My landlord’s service charge statement for [year] has still not been provided to me despite my written request of [date]. Without this statement I cannot fully declare the household services.”]

If you are unable to grant the extension to the extent applied for, I ask in the alternative for an extension until [earlier date]. I request written notice of your decision.

Yours faithfully
[Signature, given name and surname]

Important: wait for the reply and keep the letter, together with proof of posting or the ELSTER transmission log, with your tax records. If the Finanzamt grants the extension, you will usually receive a short written notice with the new date.

Fee information

Costs and payment

The application itself is free of charge: neither § 109 AO nor the other provisions of the Fiscal Code provide for a fee for an extension of the time limit. A refusal, too, does not trigger any costs, and no reimbursement of expenses is charged for processing. It is not the application that becomes costly, but its absence — the financial consequences arise only indirectly, through the late-filing penalty under § 152 AO, through a coercive fine and an estimate, and through interest on tax deficiencies.

The late-filing penalty is tiered, and it is exactly this tiering that is often overlooked. Between the expiry of the deadline and the end of the fourteenth month after the end of the calendar year, the imposition is at the Finanzamt’s discretion (§ 152 Abs. 1 Satz 1 AO); it is not imposed if the delay appears excusable (§ 152 Abs. 1 Satz 2 AO). Only once the return is not filed within fourteen months of the end of the calendar year must the penalty be imposed under § 152 Abs. 2 AO. And even then, Abs. 2 does not apply in the cases of § 152 Abs. 3 AO: where the deadline has been extended — including retroactively —, where the tax is assessed at zero euros or at a negative amount, and where the assessed tax does not exceed the sum of prepayments and creditable tax deductions. In the majority of employee cases, which result in a refund, no mandatory penalty therefore arises.

The amount follows from § 152 Abs. 5 Satz 2 AO: 0.25% of the assessed tax, reduced by the assessed prepayments and creditable tax deductions, for every month or part of a month of delay, but at least €25 per month or part of a month for returns relating to a calendar year; for shorter taxation periods the minimum amount is €10. Under § 152 Abs. 10 AO, the maximum amount is €25,000. The penalty is imposed together with the tax in the official notice (Bescheid) and falls due with it.

Independently of the late-filing penalty, under § 233a Abs. 2 Satz 1 AO, interest on tax deficiencies begins to run fifteen months after the end of the calendar year in which the tax arose; § 238 AO governs the interest rate. This interest accrues even where the deadline has been properly extended: an extension of the time limit postpones the filing, not the running of interest. Anyone expecting a large back payment should therefore file as early as possible despite the extension, or consider a deferment (Stundung) only where the payment itself — and not the return — is the problem.

Fees

Application for an extension of the time limitFree of charge — no fee provided for in the Fiscal Code

Late-filing penalty (§ 152 Abs. 5 AO)0.25% of the assessed tax reduced by prepayments and tax deductions, per month or part of a month, at least €25 per month

Maximum amount (§ 152 Abs. 10 AO)€25,000

When is it mandatory?Only if filed more than 14 months after the end of the calendar year (§ 152 Abs. 2 AO) — not in the exceptional cases under § 152 Abs. 3 AO

Other possible consequencesCoercive fine of up to €25,000 per case (§§ 328, 329 AO), estimate of the tax base (§ 162 AO), interest on tax deficiencies (§ 233a AO)

Competent bodyTax office of residence (Wohnsitzfinanzamt, § 19 AO)

Means of paymentNot applicable — no payment is required for the application

Good to know

Important notes

The deadlines at a glance. For the 2025 assessment period, the filing deadline without tax advice ended on 31 July 2026; with a tax consultant or a Lohnsteuerhilfeverein it still runs until 1 March 2027, because 28 February 2027 is a Sunday. For the 2026 assessment period, the deadline without advice ends on 2 August 2027 — 31 July 2027 falls on a Saturday, so § 108 Abs. 3 AO applies — and with advice on 29 February 2028. Always check both factors: the year concerned, and whether your return is prepared by an advising person.

An early request can bring everything forward. Regardless of these deadlines, the Finanzamt can request advised returns early under § 149 Abs. 4 AO — among other things, in the case of high back payments in the previous year, prepayments reduced outside an assessment, or an automated random selection. The return must then be filed within four months of notification of the order. This early request is an administrative act that overrides the general February deadline: anyone who files the letter away unread loses the supposed security of the advisers’ deadline without noticing it.

An expired deadline is not the end. § 109 Abs. 1 Satz 2 AO expressly allows a retroactive extension, in particular where it would be inequitable to let the legal consequences of the missed deadline stand. This is the decisive argument for a late application: if the deadline is extended retroactively, the return is treated as filed on time — and the mandatory late-filing penalty under § 152 Abs. 2 AO does not apply, under § 152 Abs. 3 Nr. 1 AO. Phrase the application therefore explicitly as an application for a retroactive extension, and set out where the inequity lies.

There is no deemed-approval rule: silence from the Finanzamt does not amount to consent. § 109 AO provides for a discretionary decision that requires an express approval. Anyone who relies on the absence of a reply risks a late-filing penalty under § 152 AO.

A stricter standard applies with a tax consultant. For deadlines under § 149 Abs. 3 AO, an extension under § 109 Abs. 2 AO is only permitted if you are or were prevented, without fault, from meeting the deadline for the tax return. For unadvised cases under § 149 Abs. 2 AO, by contrast, the free discretion of § 109 Abs. 1 AO applies.

Tax advice extends the deadline automatically. The deadline under § 149 Abs. 3 AO applies automatically until the last day of February of the second calendar year following the taxation period; no application is required for this. The condition is that the return is actually prepared by an advising person within the meaning of §§ 3 and 4 of the Tax Consultancy Act (Steuerberatungsgesetz, StBerG).

How long the extension lasts depends on the competent authority. § 109 AO contains neither a maximum nor a standard duration, and no nationally reliable standard duration is officially published. Therefore state a specific date yourself — otherwise the Finanzamt sets the date.

Late-filing penalty under § 152 Abs. 5 Satz 2 AO: 0.25% of the assessed tax, reduced by prepayments and creditable tax deductions, at least €25 per month or part of a month for annual returns. Under § 152 Abs. 10 AO, the maximum amount is €25,000.

Restoration of the status quo ante under § 110 AO is the second safety net. Anyone who was prevented, without fault, from meeting the deadline submits the application within one month of the obstacle ceasing to exist and carries out the missed act within that period (§ 110 Abs. 2 AO). After one year from the end of the missed deadline, the application is generally excluded (§ 110 Abs. 3 AO).

If you file voluntarily, you do not need an extension at all. For the income tax assessment on request, there is no statutory obligation to file, and consequently no filing deadline and no late-filing penalty. You may submit the tax return within the four-year limitation period for assessment under § 169 Abs. 2 Satz 1 Nr. 2 AO.

The approval can include conditions. Under § 109 Abs. 3 AO, the extension may be combined with an ancillary provision, for example a reservation of revocation. § 109 Abs. 4 AO also allows the tax authority to extend deadlines on a purely automated basis; an approval granted in this way is just as binding as one individually reviewed.

Not every deadline can be extended. § 109 AO covers deadlines for submitting tax returns and deadlines that a tax authority has set itself. Statutory deadlines for legal remedies — above all the one-month period for objection (Einspruchsfrist) under § 355 Abs. 1 AO — cannot be extended; there, only the restoration of the status quo ante under § 110 AO helps.

After a move: apply to the new Finanzamt. The competent office is the tax office of residence (Wohnsitzfinanzamt) under § 19 AO. In this case, also state the old Steuernummer, so that the file is assigned correctly — otherwise processing is delayed exactly during the period in which you need the decision.

Avoid these mistakes

Common mistakes

The following mistakes cost money or time in practice — usually both. Each of them can be avoided with just a few minutes’ effort.

Relying on the Finanzamt’s silence. Without an express approval, the deadline is treated as not extended. The consequence, however, is not automatically a mandatory penalty: until the end of the fourteenth month after the calendar year, the Finanzamt decides at its discretion (§ 152 Abs. 1 Satz 1 AO) and refrains from imposing it where the delay is excusable (§ 152 Abs. 1 Satz 2 AO); the penalty only becomes mandatory after that (§ 152 Abs. 2 AO) — and even then not in the cases of § 152 Abs. 3 AO. A late application is therefore not hopeless: § 109 Abs. 1 Satz 2 AO allows a retroactive extension.

Not stating a valid reason. A blanket application without a statement of reasons is often refused, because the Finanzamt cannot exercise its discretion under § 109 Abs. 1 AO without the facts. By the time the refusal arrives, valuable weeks have passed during which the original deadline kept running — and the second application is then under time pressure.

Treating the extension as a blank cheque. The extended deadline is also binding and can, under § 109 Abs. 3 AO, be combined with conditions. If you miss it again, you risk a late-filing penalty, a coercive fine under §§ 328, 329 AO — of up to €25,000 per case — and an estimate of the tax base under § 162 AO, which, by experience, does not turn out in your favour.

Not stating a specific end date. An application “for an extension” with no date forces the Finanzamt to set its own, which is often shorter than hoped. Anyone who then overlooks the approved date because they expected more time is worse off than before the application.

Applying only by phone and documenting nothing. A telephone application is permitted, but in case of a dispute you bear the burden of proving the approval. Without a file note, the contact person’s name and written confirmation, it cannot later be shown that an extension was granted — an already imposed late-filing penalty then stands.

Assuming the wrong standard when you have tax advice. Many clients assume that the advisers’ deadline can be extended just as informally as the July deadline. § 109 Abs. 2 AO, however, requires that you were prevented through no fault of your own for deadlines under § 149 Abs. 3 AO. Anyone who cites only “work overload” regularly receives a refusal — and the February deadline has often already passed by then.

Overlooking an early request under § 149 Abs. 4 AO. If the Finanzamt requests the advised return early, a deadline of four months after notification of the order applies; the general February deadline no longer helps at that point. Anyone who files the letter away unchecked misses the deadline without noticing — and only learns of it through the late-filing penalty.

Confusing mandatory and voluntary assessment. Anyone who files voluntarily does not need an extension; the application is simply unnecessary. Conversely, the idea “I am filing voluntarily anyway” does not help if a ground for mandatory assessment under § 46 Abs. 2 EStG actually applies — then the deadline and sanctions continue to run unnoticed.

Accepting the refusal without contesting it. A refusal of an extension of the time limit is an administrative act; an Einspruch against it is possible under § 347 Abs. 1 Nr. 1 AO within one month of notification (§ 355 Abs. 1 AO). Anyone who lets this one-month period lapse loses the opportunity to have the discretionary decision reviewed — the return itself remains due in the meantime regardless.

Frequently asked questions

Questions and answers

How long can the deadline be extended?

This depends on the competent authority. § 109 AO contains neither a statutory maximum duration nor a standard duration; the approval is a purely discretionary decision of the relevant Finanzamt, and no nationally reliable standard duration is officially published. Therefore state a specific end date in the application yourself, and give reasons why exactly this period is needed.

Can I apply for the extension by phone?

Yes. § 109 AO prescribes no form for the application, so it is informal and also possible by phone. The written route, or a message via “Mein ELSTER”, remains advisable, because in case of a dispute you must show that the extension was granted and until when.

What happens if my application is refused?

If the original deadline is still open when the refusal is received, you must file the tax return by that date. If it has already expired, file the return without delay: a later application is nevertheless not hopeless, because § 109 Abs. 1 Satz 2 AO allows a retroactive extension, and in addition the restoration of the status quo ante under § 110 AO may be considered. An objection (Einspruch) against the refusal itself is also admissible under § 347 Abs. 1 Nr. 1 AO within one month.

Can an already expired deadline still be extended?

Yes. Under § 109 Abs. 1 Satz 2 AO, the Finanzamt can extend an already expired deadline retroactively, in particular where it would be inequitable to let the legal consequences of the missed deadline stand. If extended retroactively, the mandatory late-filing penalty also ceases to apply, because § 152 Abs. 2 AO does not apply in these cases under § 152 Abs. 3 Nr. 1 AO.

Does the extension also apply if a tax consultant prepares the return?

In that case, the statutory extension under § 149 Abs. 3 AO applies automatically first, and no application is required for it. A further extension beyond that is only permitted under § 109 Abs. 2 AO if the taxpayer is or was prevented, without fault, from meeting the deadline for the tax return; mere work overload at the tax consultant’s firm generally does not meet this standard.

By when must I file the tax return for 2025 and 2026?

Without tax advice, the deadline for the 2025 assessment period ended on 31 July 2026; for the 2026 assessment period it runs until 2 August 2027, because 31 July 2027 falls on a Saturday (§ 108 Abs. 3 AO). With a tax consultant or a Lohnsteuerhilfeverein, § 149 Abs. 3 AO extends the deadline for 2025 until 1 March 2027, because 28 February 2027 is a Sunday, and for 2026 until 29 February 2028.

Is a late-filing penalty always due for a late filing?

No. Until the end of the fourteenth month after the end of the calendar year, the imposition is at the Finanzamt’s discretion (§ 152 Abs. 1 Satz 1 AO) and is not imposed if the delay appears excusable (§ 152 Abs. 1 Satz 2 AO). The penalty only becomes mandatory after that (§ 152 Abs. 2 AO), and even then not in the cases of § 152 Abs. 3 AO — that is, for example, where the deadline has been extended or retroactively extended, where the tax is assessed at zero euros, or where the assessed tax does not exceed the prepayments and creditable tax deductions.

What does the application for an extension of the time limit cost?

The application is free of charge; neither § 109 AO nor the other provisions of the Fiscal Code provide for a fee for it. Costs only arise indirectly, if no extension is granted and the Finanzamt imposes a late-filing penalty under § 152 AO: at least €25 per month or part of a month and at most €25,000.

Do I need to apply for an extension if I file voluntarily?

No. For the income tax assessment on request, there is no statutory obligation to file and therefore no filing deadline that could be extended; a late-filing penalty does not come into consideration in these cases. You may submit the return within the four-year limitation period for assessment under § 169 Abs. 2 Satz 1 Nr. 2 AO.

Extension of the time limit for the tax return

What your application must contain

How to proceed

Check whether you are obliged to file at all

Determine the deadline that applies to you

Check the correct standard: § 109 Abs. 1 or Abs. 2 AO

Draft the application

Submit the application in good time

Wait for the express approval

Respond correctly to a refusal

File the return within the extended deadline

Template letter: informal application for an extension of the time limit

Costs and payment

Fees

Important notes

Common mistakes

Questions and answers

Cannot find the official procedure you are looking for?

Extension of the time limit for the tax return

What your application must contain

How to proceed

Check whether you are obliged to file at all

Determine the deadline that applies to you

Check the correct standard: § 109 Abs. 1 or Abs. 2 AO

Draft the application

Submit the application in good time

Wait for the express approval

Respond correctly to a refusal

File the return within the extended deadline

Template letter: informal application for an extension of the time limit

Costs and payment

Fees

Important notes

Common mistakes

Questions and answers

Related official procedures

Cannot find the official procedure you are looking for?