PhD costs often add up quietly: specialist literature, software, trips to archives, conference fees. Whether the tax office recognises them depends on whether you also have an employment contract and how your doctorate (Promotion) is classified for tax purposes. This guide explains the two possible routes and shows how to document the costs.
Short answer: You can claim doctoral costs for tax either as income-related expenses (Werbungskosten) if you have an employment contract (section 9 EStG) or as special expenses (Sonderausgaben) for your own vocational training under section 10(1) no. 7 EStG. The cap for special expenses is 6,000 euros per calendar year. Whether a doctorate counts as vocational training is decided by the tax office case by case. Last updated: October 2026.
Key points at a glance
- There are two routes: income-related expenses if you have a job, and special expenses for your own vocational training.
- The cap for special expenses under section 10(1) no. 7 EStG is 6,000 euros per calendar year.
- For income-related expenses, only costs above the employee lump sum of 1,230 euros per year (in place since 2023, section 9a EStG) add to your tax benefit.
- The tax office decides case by case whether a doctorate counts as vocational training. Asking in advance saves trouble later.
- Scholarships follow their own tax rules, which are covered in our guide on scholarships and tax during a doctorate.
Which doctoral costs can you deduct?
As a rule, costs that are directly linked to your dissertation can be deducted. These include specialist literature, software, materials for experiments or surveys, trips to archives or research institutions, and fees for conferences where you present your work. Private spending does not count, even if it falls in the same period. For items with mixed use, such as a laptop, only the professional share counts, and you must be able to justify it. The table below shows which evidence has proven useful:
| Type of cost | Typical evidence |
|---|---|
| Specialist literature and licences | Invoice with date, title and payment record |
| Trips to archives or fieldwork | Mileage log or a list with destination, date and purpose |
| Conference fees and travel costs | Conference programme and invoice or booking confirmation |
| Materials for experiments or surveys | Invoices and a link to the project |
Income-related expenses or special expenses: which fits you?
If you have an employment contract alongside your doctorate, for example a half-time doctoral post, the tax office can recognise job-related costs as income-related expenses (section 9 EStG). Only the amount above the employee lump sum of 1,230 euros per year counts toward your benefit (section 9a EStG). This lump sum has applied since 2023 and is taken into account without separate proof.
Example (assumption): you have a half-time doctoral post and doctoral costs of 2,000 euros that are recognised as income-related expenses. Only the 770 euros above the lump sum add to your deduction, that is 2,000 euros minus 1,230 euros. Whether the tax office accepts the full amount in your case is up to the tax office.
Example (assumption): your costs are only 800 euros. They stay below the lump sum of 1,230 euros, so the income-related expense route adds nothing for this cost type, and the lump sum remains your deduction.
Without an employment contract, the requirements for income-related expenses are missing, so the special-expense route is the one that matters for you. Special expenses for your own vocational training can be deducted up to 6,000 euros per calendar year (section 10(1) no. 7 EStG). The statute speaks of your own vocational training, not of the doctorate by name. Whether a doctorate falls under it is decided by the competent tax office in your case and, in a dispute, by the fiscal court.
Example (assumption): you have no job and doctoral costs of 4,000 euros in one calendar year. If the conditions are met, 4,000 euros can be deducted because the amount stays under the cap. With 8,000 euros in the same year, at most 6,000 euros can be deducted.
The same expense cannot be claimed twice. Which route fits a given type of cost is best clarified with the tax office or a tax adviser before you file.
How do you document the costs?
A clean folder of receipts often decides whether a deduction is accepted. Work through these steps:
- Collect all receipts with date, amount and purpose, for example invoice and bank statement.
- Separate professional and private expenses. For mixed use, record the share and how you calculated it.
- Assign the costs to the calendar year, because the cap and the lump sum apply each year.
- Enter the amounts in your tax return in the relevant fields and keep the receipts until the tax assessments are final.
Keep related receipts together. The programme, participation confirmation and travel documents of a conference belong in one folder. If you claim trips with your own car, note the route, date and purpose of each trip, because the tax office may ask for exactly these details. A spreadsheet with date, amount, receipt number and category saves a lot of time when you prepare your tax return.
Frequently asked questions
Can I claim doctoral costs for earlier years?
In many cases you can file or correct earlier tax returns, as long as the tax office’s deadlines allow it. Ask the tax office directly about the exact deadlines and requirements. Collect receipts early so that you do not face a gap later.
Do I have to pay tax on a scholarship?
That depends on the type of funding. The guide on scholarships and tax during a doctorate explains the rules. Check there how a scholarship can affect the deduction of costs as well.
How high is the employee lump sum?
The employee lump sum is 1,230 euros per year and has applied since 2023 (section 9a EStG). Only income-related expenses above this amount reduce your taxable income further.
Is it worth checking small amounts?
With small costs below the lump sum, the income-related expense route brings little, because the lump sum applies anyway. Higher amounts are more worth checking closely. Regardless of the sum, keep your receipts carefully.
Who can help me classify the costs?
The competent tax office gives information on your individual case. A tax adviser or a Lohnsteuerhilfeverein can help when employment, scholarship and costs come together. Bring your receipts and your contract.
Can a doctorate count as vocational training under the law?
That must be clarified case by case. The statute does not name the doctorate explicitly. The tax office makes the decision, so a written request with your facts makes sense before you claim larger amounts.
What to do now
- Check whether you have an employment contract alongside your doctorate and note the calendar year in which the costs arose.
- Set up a receipt folder and separate professional from private expenses.
- Ask the tax office or a tax adviser which route fits your case.
- Record the costs every year and keep the receipts.
Related guides
- Is a scholarship taxable? Tax and social insurance
- Part-time jobs and taxes for students in Germany
- PhD in Germany: routes, titles and requirements
- Promotion finanzieren: Stelle, Stipendium oder Eigenmittel im Vergleich (in German)
- PhD on a Half-Time Contract: What Is Left After Social Insurance
Sources: EStG, section 10(1) no. 7, German text (accessed October 2026); EStG, section 9a, German text (accessed October 2026); EStG, section 9, German text (accessed October 2026).
Last updated: October 2026. This guide is general information, not individual advice.
