If a tax advisor prepares your tax return, the deadline for filing is longer than if you file it yourself. This advisor deadline is set in the law and moves the filing date back by several months. This guide shows how it applies to the 2026 tax return with the exact dates.
Short answer: Without a tax advisor, the 2026 tax return must be filed by 2 August 2027. The standard deadline falls on 31 July 2027, a Saturday, so it moves to Monday, 2 August 2027. With an advisor appointed, the advisor deadline runs to 29 February 2028. Last updated: November 2026, based on section 149 AO.
The most important points at a glance
- The standard deadline for the tax return ends seven months after the end of the calendar year, so on 31 July of the following year.
- If that date falls on a weekend or public holiday, the deadline moves to the next working day.
- If you appoint a tax advisor, you have a longer deadline until the last day of February in the second following year.
- The advisor deadline only applies if a tax advisor is actually appointed to prepare the return.
- For the 2025 tax return, the standard deadline ended on 31 July 2026.
What is the advisor deadline and who can use it?
The advisor deadline is an extended filing deadline regulated in section 149 (3) of the German Fiscal Code (Abgabenordnung, AO). It only applies if a tax advisor (Steuerberater) is appointed to prepare the tax return. What matters is the appointment of a tax advisor, not who helps you with the forms in everyday life.
The advisor deadline follows directly from the law. Ask your tax advisor how to document the appointment for the tax office, since they know which records your case requires.
How long is the standard deadline without a tax advisor?
The standard deadline for filing the tax return ends seven months after the end of the calendar year to which the return relates (section 149 (2) AO). The table below shows the two tax years that are currently relevant.
| Tax year | Standard deadline without tax advisor | Status as of November 2026 |
|---|---|---|
| 2025 | Friday, 31 July 2026 | Deadline has passed |
| 2026 | Saturday, 31 July 2027, so Monday, 2 August 2027 | Not yet passed |
If the deadline falls on a Saturday, Sunday or public holiday, it ends with the next working day. Section 108 (3) AO regulates this. That is why 31 July 2027 is not the last date for the 2026 tax return, even though it appears on the calendar.
Until when does a tax advisor extend the deadline?
With an appointed tax advisor, the deadline ends on the last day of February in the second following year (section 149 (3) AO). For the 2026 tax return, that is Tuesday, 29 February 2028, because 2028 is a leap year. Without an appointment, this extension does not apply.
| Tax year | Advisor deadline | Requirement |
|---|---|---|
| 2026 | Tuesday, 29 February 2028 | Appointment of a tax advisor |
Assumption: you have a part-time job in 2026 and have a tax advisor prepare your return. Without an advisor, you would have until 2 August 2027, with an advisor until 29 February 2028. The difference is therefore roughly seven months.
What the advisor deadline does not change
The advisor deadline only affects the date for filing the return. Which tax ultimately applies depends on your tax situation and the tax assessment notice. If you expect a refund, do not wait only because the filing date is later, since a refund follows the tax office processing your return.
Which documents to prepare for the deadline
The sooner you gather your records, the less time the return takes at the end. This applies with and without a tax advisor. Typically these documents are needed:
- Wage tax certificates from your main and part-time jobs
- Receipts for work-related expenses, for example for travel or work equipment
- Evidence of income that is not paid through an employer
- Records of pension contributions and donations, if applicable
- The engagement letter with your tax advisor, so the appointment can be proven
Common mistakes when calculating the deadline
The same confusions come up again and again when calculating deadlines. The following points help you avoid them.
- Mixing up the standard deadline with the advisor deadline, although only the second applies with an appointed tax advisor.
- Overlooking that a weekend at the end of a deadline shifts the date under section 108 (3) AO.
- Mixing up tax years, for example treating the deadline for 2025 as the deadline for 2026.
- Failing to record the appointment of the tax advisor in writing and later being unable to prove it.
What happens if you miss the deadline?
A late filing can have consequences. Whether a surcharge is imposed and how high it would be depends on the individual case. The competent tax office (Finanzamt) can tell you about this, and you can clarify your specific situation there.
If you realise you will not finish in time, contact the tax office early. In individual cases, the tax office decides for itself whether it grants more time, and an early message gives you more room than a late one.
Tax return with or without a tax advisor
The decision depends less on the deadline than on your effort. For simple circumstances with wage tax from one job, the return can often be prepared without an advisor. With several types of income, cross-border links or questions about deductions, a tax advisor is worth considering. Our article on filing a tax return without a tax advisor describes what to expect without one.
Frequently asked questions
Does the advisor deadline also apply to students?
The deadline does not depend on student status but on appointing a tax advisor. Whether you have an obligation to file at all depends on your income. If you do have that obligation, the same deadlines apply.
Can I get a longer deadline without a tax advisor?
The advisor deadline only exists with an appointed tax advisor. Whether the tax office grants a different extension in individual cases is its own decision. Ask early, before the deadline expires.
When must the 2025 tax return be filed?
The standard deadline for the 2025 tax year ended on Friday, 31 July 2026. If you have appointed a tax advisor, the advisor deadline for 2025 runs until the end of February 2027. Last updated: November 2026.
Do I have to apply for the advisor deadline at the tax office?
The advisor deadline is set out in the law. Ask your tax advisor whether and how you must prove the appointment to the tax office.
What if I appoint a tax advisor only after the standard deadline?
The advisor deadline requires an appointment. Whether an appointment made after the standard deadline still leads to an extension is an individual question. Clarify the timing with your tax advisor and the competent tax office before the deadline passes.
What to do now
- Determine the tax year. For 2026, note 2 August 2027 without an advisor and 29 February 2028 with an appointed tax advisor.
- Decide whether you will appoint a tax advisor and record the appointment in writing.
- Enter the deadline in your calendar and gather the documents from the list above.
- Clarify open questions about the deadline with your tax advisor or the competent tax office before the date approaches.
Related articles
- Topic overview: Taxes 2027 for students and new graduates
- Tax return 2026: deadlines for students until 31 July 2027
- Tax return without a tax advisor: is it worth it for students?
- Letter from the tax office: deadlines and what to do now
- Preliminary tax assessment: what it means and what you can do
Sources: Section 149 AO, filing deadlines for tax returns (gesetze-im-internet.de, last updated November 2026), Section 108 AO, calculation of deadlines (gesetze-im-internet.de, last updated November 2026)
Last updated: November 2026. This guide is general information, not individual advice.
