Photovoltaics: Tax simplification for systems up to 30 kWp

Since 1 January 2022, photovoltaic systems on single-family homes up to 30 kWp are tax-free. The tax exemption also applies to older systems and significantly simplifies the tax process.

This regulation applies regardless of how the generated electricity is used and allows private property owners to install photovoltaic systems without complications.

However, this tax exemption affects the deduction of operating expenses, as expenses related to tax-free income can no longer be deducted. This raises legal questions, particularly regarding depreciation already made, which will be lost from 2022 onwards. The courts may decide on the constitutionality and protection of legitimate expectations in this context. Despite the loss of depreciation over the entire service life of the system, the new regulation is considered advantageous.

It is important to note that the tax exemption also applies to photovoltaic systems on multi-family houses and mixed-use buildings up to 15 kWp per unit.

Photovoltaics: Tax simplification for systems up to 30 kWp

What is the half-income / partial income procedure?

The half-income procedure was replaced on 1 January 2009 by the partial income procedure.

Under the half-income procedure, income from shares in companies (shares, GmbH shares, cooperative shares) is only 50% taxable. Advertising costs related to this can also only be deducted by half. If such shares are part of business assets, the income from them - after deducting half of the expenses - is to be taxed as income from business operations.

If your income from business operations (as a sole trader, from a partnership, according to separate determination, from a group) includes income for which the half-income procedure applies, enter this amount here as a total. Only the half taxable partial amount!

Under the partial income procedure, income and capital gains from shares in companies (shares, GmbH shares, cooperative shares) are 60% taxable. In return, only 60% of the expenses are deductible as advertising costs. So if you hold shares in companies as business assets, you must separately declare dividends and profit distributions received, which are included in your income from business operations or self-employment and are only 60% taxable, in Form G or Form S.

What is the half-income / partial income procedure?

When must I declare my profit from business operations separately?

You must make a separate income assessment if a different tax office from your local tax office is responsible for this income. This is the case, for example, if you operate your business at a location other than your place of residence.

If you are involved in a joint venture or partnership, a separate and uniform assessment is also carried out.

Your local tax office will be informed of the amount of income attributable to you. You must therefore always provide the relevant tax office and the tax number under which this income is assessed.

If you do not (yet) know the exact amount of the tax assessment, enter "0.00" or the estimated amount in the relevant field and explain this in the cover letter to your tax office.

When must I declare my profit from business operations separately?

Who qualifies as a joint entrepreneur?

A joint partner is someone who, together with at least one other partner, is the owner, tenant, and/or beneficiary of a business.

This means you are in a position to make economic decisions only together with your business partner(s) and to decide on the company's profit share. Such a partnership must take the form of a partnership for which the legislator provides three specific types:

• Civil Law Partnership (GbR)
• General Partnership (OHG)
• Limited Partnership (KG)

The type of partnership determines the extent to which joint partners participate in the profit and how the company is to be treated for tax purposes. In the tax return, you specify the type of business you operate or lease as a joint partner in the form of a partnership. Possible entries could be: "craft business", "estate agent", "restaurant", etc. In addition to this information, you must also enter the tax number of each business and the respective tax office in the tax return.

The result of the respective profit calculation is entered in Form G for traders or in Form S for freelancers and other self-employed persons.

Who qualifies as a joint entrepreneur?

What is income from business operations?

A business operation according to § 15 EStG exists if you engage in an activity independently (i.e. on your own account and responsibility), sustainably (i.e. not a one-off action) and with the intention of making a profit (i.e. not a hobby) and participate in general economic transactions (i.e. appear externally). However, these conditions apply equally to freelance work according to § 18 EStG.

Businesses include:

• Craft and industrial businesses,
• Trading businesses,
• Brokerage activities (e.g. insurance agents, brokers or commercial agents),
• Catering businesses,
• Service companies.
• Corporations such as public limited companies (AG) and limited liability companies (GmbH) are businesses by virtue of their legal form (§ 2 para. 2 GewStG).

Income from business operations also includes:

• Profit shares from participation in a partnership (oHG, KG or commercial GbR).
• Income from the sale of a business, part of a business or a share in a business.
• Gains from the sale of a share in a corporation if this amounts to at least 1% of the share capital (§ 17 EStG). This also applies to private investors. Since 2009, the partial income procedure applies, i.e. 60% of the capital gain is taxable and 40% is tax-free (§ 3 No. 40 letter c EStG). For shares acquired before 2009, the half-income procedure with its half taxation still applies.
• Income from the sale of more than 3 properties within 5 years. In this case, the tax office assumes commercial property trading, regardless of the 10-year period.
• Income from the rental of holiday homes if the type of rental is comparable to a commercial accommodation business. Otherwise, it is "income from renting and leasing".
• Professional carers according to §§ 1896 ff. BGB have not earned income from business operations since 2010, contrary to previous opinion, but from "other self-employed work" according to § 18 para. 1 no. 3 EStG (BFH rulings of 15.6.2010, BStBl. 2010 II p. 906 and 909).

What is income from business operations?

When can I determine the profit using the net income method?

In the net income method according to § 4 para. 3 EStG, business income is compared with business expenses, and the result is the profit or loss.  

Traders and farmers can currently determine their profit using the net income method if

• the annual turnover does not exceed 600,000 Euro and
• the annual profit does not exceed 60,000 Euro in the calendar year or financial year.

Freelancers, such as lawyers, notaries, tax consultants, doctors, journalists, artists, etc., and other self-employed persons can always use the net income method for their profit calculation - regardless of a turnover and profit limit. They are generally not required to keep accounts, but can do so voluntarily.

Merchants within the meaning of §§ 1 ff. in conjunction with § 238 HGB are always obliged to keep accounts - regardless of a turnover or profit limit. This accounting obligation also applies to tax law (§ 140 AO). The regulation applies to merchants who operate a commercial business, as well as entrepreneurs whose business requires a commercial organisation due to its nature and scope.

When can I determine the profit using the net income method?

Is it possible to choose the net income method retrospectively?

Taxpayers who are not required to keep accounts and do not voluntarily keep books and prepare financial statements have the right to choose between the business asset comparison under section 4 (1) EStG and the cash basis accounting under section 4 (3) EStG:

• A taxpayer not required to keep accounts has - according to previous opinion - effectively exercised their right to determine profits through inventory comparison under section 4 (1) EStG only when they prepare an opening balance sheet, set up commercial bookkeeping, and make a financial statement based on inventories.

• If, on the other hand, the taxpayer has only recorded business income and expenses, they have exercised their right to determine profits through cash basis accounting under section 4 (3) EStG based on this actual practice.

According to the new opinion, the entrepreneur can also exercise the right after the end of the year, in principle indefinitely until the tax assessment becomes final. If the entrepreneur then prepares an annual financial statement, they only decide on profit determination through accounting at that point - and not already with the establishment of bookkeeping at the beginning of the financial year (BFH ruling of 19.3.2009, BStBl. 2009 II p. 659).

However, the right is restricted by certain conditions (section 4 (3) sentence 1 EStG). For example, the choice of cash basis accounting is no longer possible after the financial statement has been prepared. Similarly, the choice of profit determination through inventory comparison is excluded if the taxpayer has not prepared an opening balance sheet and set up commercial bookkeeping promptly at the beginning of the profit determination period. The choice between the types of profit determination may also be excluded if the taxpayer is bound by a choice made for a previous financial year.

Note: This interpretation also serves the simplification purpose of cash basis accounting. The taxpayer can opt for cash basis accounting to avoid preparing the financial statement, even if they have already set up bookkeeping. For the tax office, it is only important that it actually receives the cash basis accounting after the choice has been made.

Is it possible to choose the net income method retrospectively?

Is a home office deductible for managing the photovoltaic system?

Since 1 January 2022, photovoltaic systems on single-family homes (including roofs of garages and carports as well as other outbuildings) up to 30 kWp have been legally exempt from tax.

But not only systems on single-family homes are favoured:

• Systems installed on buildings not used for residential purposes (e.g. commercial property, garage courtyard) are also exempt from tax. The limit here is also 30 kWp.
• For systems on multi-family homes and mixed-use buildings, the limit is 15 kWp per residential or commercial unit.
• In addition, photovoltaic systems on buildings predominantly used for business purposes are favoured up to 15 kWp per residential/commercial unit.
• A maximum of 100 kWp per taxpayer or partnership is exempt from tax.

The tax exemption applies regardless of the date the photovoltaic system was commissioned for income and withdrawals generated since 1 January 2022.

Expenses may not be deducted as business expenses or advertising costs if they are directly economically related to tax-free income. This is regulated in § 3c para. 1 EStG. This also means that operating expenses directly economically related to the (possibly future) operation of tax-exempt photovoltaic systems are not deductible. This also applies to any costs of a home office in connection with the management of the photovoltaic system.

Is a home office deductible for managing the photovoltaic system?

Who is required to complete Form G (Income from Business Operations)?

A business as defined in Section 15 of the Income Tax Act exists if you engage in an activity independently (i.e., on your own account and responsibility), on a sustainable basis (i.e., not a one-off action), with the intention of making a profit (i.e., not a hobby), and participate in general economic transactions (i.e., appear externally). However, these conditions also apply in the same way to freelance work as per Section 18 of the Income Tax Act (H 15.6 EStR).

Businesses include

• Craft and industrial enterprises,
• Trading businesses,
• Brokerage activities (e.g., insurance agents, brokers, or commercial agents),
• Catering businesses,
• Service companies.
• Corporations such as public limited companies (AG) and limited liability companies (GmbH) are businesses by virtue of their legal form (Section 2 (2) GewStG).

Income from business also includes

• Profit shares from participation in a partnership (oHG, KG, or commercial GbR).
• Income from the sale of a business, part of a business, or a share in a business (Section 16 of the Income Tax Act).
• Gains from the sale of a share in a corporation if this amounts to at least 1% of the share capital (Section 17 of the Income Tax Act). This also applies to private investors. Since 2009, the partial income procedure applies, i.e., 60% of the capital gain is taxable and 40% is tax-free (Section 3 No. 40 letter c of the Income Tax Act). For shares acquired before 2009, the half-income procedure with its half taxation still applies.
  For a shareholding of less than 1% of the share capital, the capital gain has been fully taxable as capital income since 2009, regardless of the holding period, and is subject to the withholding tax of 25%. However, this only applies to shares acquired from 2009 onwards (Section 20 (2) No. 1 of the Income Tax Act). For acquisitions before 2009, the previous legal situation remains, according to which a capital gain is tax-free after a holding period of 12 months. Distributions are subject to withholding tax in both cases from 2009 onwards.
• Income from the sale of more than 3 properties within 5 years. In this case, the tax office assumes commercial property trading, regardless of the 10-year period. For the sale of up to three properties, the capital gains are usually only taxable within the so-called speculation period of 10 years, as "other income".
• Income from the rental of holiday homes if the type of rental is comparable to a commercial accommodation business. Otherwise, it is "income from renting and leasing".
• Professional guardians according to Sections 1896 ff. BGB have not generated income from business since 2010, contrary to previous opinion, but from "other self-employed work" according to Section 18 (1) No. 3 of the Income Tax Act (BFH rulings of 15.6.2010, BStBl. 2010 II p. 906 and 909).

Who is required to complete Form G (Income from Business Operations)?

Photovoltaics: Operating and selling the system are business income

Even before 2022, the tax authorities allowed concessions for operators of small photovoltaic systems, but only for systems up to 10 kWp: Upon written application by the taxpayer, it could be assumed that a system was not operated with the intention of making a profit ("hobby option"). Result: It was permitted to forgo the preparation and submission of an income statement, and profits no longer had to be taxed.

Since 1 January 2022, photovoltaic systems on single-family homes (including roofs of garages and carports as well as other outbuildings) up to 30 kWp have been legally exempt from tax.

But not only systems on single-family homes are favoured:

• Systems installed on buildings not used for residential purposes (e.g. commercial property, garage courtyard) are also exempt from tax. The limit here is also 30 kWp.
• For systems on multi-family houses and mixed-use buildings, the limit is 15 kWp per residential or commercial unit.
• In addition, photovoltaic systems on buildings predominantly used for business purposes are favoured up to 15 kWp per residential/business unit.
• A maximum of 100 kWp per taxpayer or partnership is exempt from tax.

The tax exemption applies regardless of the date the photovoltaic system was commissioned for income and withdrawals generated since 1 January 2022.

The simplification rule from 2022 is structured differently from the previous hobby option: Taxation is now compulsorily waived and not just as part of an option. A "hobby application" is therefore no longer relevant. This is regulated in § 3 No. 72 EStG in the version of the Annual Tax Act 2022.

Photovoltaics: Operating and selling the system are business income

What is included in capital gains?

Income from business operations also includes the profit from the sale of an entire business, a part of a business (branch, subsidiary), or a share in a partnership. The termination of a business is also considered a sale. Shares in a company that are created when a business, part of a business, or a share in a partnership is contributed to a company as an asset in exchange for shares in the company at below market value are also included (§ 21 UmwStG).

If you sell or terminate your business or share in a partnership, you can take advantage of two important tax benefits:

• Tax allowance for sale: The profit from the sale is tax-free up to 45.000 Euro. However, this amount is reduced if the profit from the sale exceeds 136.000 Euro, by the amount exceeding this limit. Therefore, the tax allowance is no longer available if the profit from the sale is 181.000 Euro or more (§ 16 Abs. 4 EStG).
• Reduced tax rate: The remaining profit from the sale, after deduction of the allowance, is eligible for the one-fifth rule. Upon request, it can also be taxed at a reduced rate, namely 56% of the average tax rate and at least 14% (§ 34 Abs. 3 EStG).

The tax allowance for sale and the reduced tax rate are only granted under certain conditions:

• You must be at least 55 years old or permanently incapacitated for work in the sense of social security law.
• You can only claim these benefits once in your lifetime: the tax allowance for sale from 1996, the reduced tax rate from 2001.
• You must apply for the benefits.

If the business is sold before the age of 55, without being permanently incapacitated for work, only the one-fifth rule applies. However, this rule does not result in any tax savings if current income is already taxed at the top rate.

When selling a share in a partnership, you are also entitled to the full tax allowance for sale, not just a proportionate amount. However, if you sell only part of your share in a partnership, the profit from the sale is considered current income, and neither the tax allowance for sale nor the reduced tax rate or the one-fifth rule apply (§ 18 Abs. 3 i.V.m. § 16 Abs. 1 Satz 2 EStG).

To prove permanent incapacity for work, a notice from the pension insurance provider or a medical certificate is usually sufficient. This can also be done by a private insurance company if their conditions meet a certain threshold for incapacity for work. However, it has been established that there are other ways to prove permanent incapacity for work (BFH ruling of 14.12.2022, X R 10/21).

What is included in capital gains?

Is there an obligation to submit the EÜR electronically even if the profit is small?

The Rhineland-Palatinate Tax Court has ruled that taxpayers with income from profits are required to submit their income tax return electronically to the tax office, even if they earn only minor profits from part-time work. The electronic form is mandatory if the profit exceeds 410 EUR (Rhineland-Palatinate Tax Court, 15.7.2015, 1 K 2204/13).

The case: The claimant is self-employed part-time as a photographer, author, and diving instructor. The tax office first informed him in 2011 that he was required to submit his income tax return electronically due to this self-employment. The claimant argued that the profits from his self-employed work would only be around 500 Euro per year in the future. He also fundamentally opposed the transmission of personal data via the internet, as he had already had relevant experiences with internet misuse. Even with internet banking, absolute security could not be guaranteed.

According to the tax court, the Income Tax Act requires the electronic form if the profit exceeds 410 Euro. This form was not unreasonable for the claimant. The residual risk of a hacker attack on the stored or transmitted data, remaining after all technical security options have been exhausted, must be accepted in view of the state interest in administrative simplification and cost savings.

Absolute confidentiality of data cannot be guaranteed anyway, as data stored "analogue" in paper form could also be stolen, e.g. in a burglary at home or – as reported in the media on 13.6.2015 – in burglaries into bank mailboxes. Electronic tax returns are also required for VAT, and the Federal Fiscal Court has already ruled that this is constitutional despite the "NSA affair".

Currently, the Münster Tax Court has ruled that a balance sheet may also be submitted to the tax office in paper form if the creation of the technology for data transmission would be financially too costly (judgment of 28.1.2021, 5 K 436/20 AO).

However, the Federal Fiscal Court has ruled that a financial expense of 40.54 Euro for the required electronic transmission of the balance sheet and the profit and loss account in the officially prescribed data format is also (economically) reasonable for a "micro-enterprise" (Federal Fiscal Court judgment of 21.04.2021, XI R 29/20).

Note: Employees and pensioners who are not required to submit an electronic tax return and receive expense allowances for their voluntary work up to the amount of the volunteer allowance of 840 Euro or the trainer allowance of 3.000 Euro per year may, in our opinion, continue to use the paper forms for the tax return. However, the tax offices are increasingly handling this more restrictively.

Is there an obligation to submit the EÜR electronically even if the profit is small?

What is the business identification number (W-IdNr.)?

The W-IdNr. is a unique identifier assigned to all companies and self-employed individuals operating economically in Germany. It consists of "DE" and nine digits. Unlike the VAT identification number (USt-IdNr.) or the tax identification number (IdNr.) for individuals, the W-IdNr. is intended for companies and self-employed individuals of all legal forms. The aim is to simplify communication between companies and authorities.

Introduction of the W-IdNr.

From 1 November 2024, the BZSt will begin the gradual allocation. Affected companies and individuals will receive the number automatically and free of charge. The process is expected to be completed by 2026.

Function of the W-IdNr. compared to existing numbers

The tax number will remain valid on tax forms even after the introduction of the W-IdNr. The tax identification number (IdNr.) for individuals according to § 139a Fiscal Code (AO) will also remain. Unlike the USt-IdNr., the W-IdNr. does not need to be applied for.

Regulations for the W-IdNr.

The exact regulations for the introduction and allocation of the W-IdNr. are set out in the Business Identification Number Ordinance. This governs the timing of the introduction, the allocation practice, and the deletion of numbers. The W-IdNr. serves as a central identification feature in communication with tax offices and other authorities.

Information from the BZSt

The Federal Central Tax Office provides comprehensive information and FAQs on the W-IdNr. on its website, including the following questions:

• Who receives a W-IdNr.?
• Is more than one W-IdNr. issued for multiple businesses?
• Difference from the USt-IdNr.?
• What to do if master data changes?

More information can be found at www.bzst.de in the section Companies > Identification numbers > Business Identification Number.

Conclusion: The introduction of the W-IdNr. from November 2024 is a step towards modernising the German tax system. It aims to simplify communication between companies and authorities. Allocation is automatic and free of charge.

What is the business identification number (W-IdNr.)?