German Tax Draft Cuts Monthly Interest Rate to 0.3% as VAT Groups Shift to Opt-In Model

A fresh legislative proposal from Germany’s finance ministry, published on 19 May, is set to reshape how companies handle value-added tax structures, property purchases and interest on overdue tax — with several changes only taking effect from 2027 and 2029. The Jahressteuergesetz 2026 (Annual Tax Act 2026) also introduces new rules for artificial intelligence in tax audits and raises the ceiling on research allowances.

Interest on Tax Debt Nearly Halved

Starting 1 January 2027, the monthly interest rate on back taxes will drop to 0.3 percent (3.6 percent annually). That is a sharp reduction from the current 0.5 percent per month, which had been in place for years. The change is intended to bring German rates closer to market levels and ease the burden on taxpayers caught in lengthy disputes with authorities.

The same date will see a tenfold increase in the threshold for withholding tax on foreign payments under Section 50a of the Income Tax Act. The freigrenze jumps from 10,000 euros to 100,000 euros, giving international service providers and performers more room before tax is deducted at source.

Research Bonus Cap Rises to 25 Million Euros

Companies claiming the research allowance (Forschungszulage) will benefit from a higher ceiling: the draft raises the maximum eligible cost basis to 25 million euros. That is a significant increase and is designed to stimulate R&D spending across German businesses.

VAT Groups Become an Application-Only Model from 2029

One of the most structural reforms concerns umsatzsteuerliche Organschaft — the VAT fiscal unity regime. Currently, a group is formed automatically once control, economic integration and organisational integration are present. Under the new Section 2c of the VAT Act (draft), the unity will only take effect upon formal application. The change is scheduled for 1 January 2029.

The familiar three integration criteria remain unchanged, but the draft opens the door for partnerships (Personengesellschaften) to qualify as group members for the first time. Faulty applications can be corrected through special remedial provisions. The parent entity continues to bear liability, and a ban on retroactive effect aims to provide legal certainty.

Purchase Price Allocation Gets a Statutory Framework

Real estate transactions have long been a battleground between taxpayers and tax inspectors over how to split a purchase price between land and building. The draft inserts Section 6f EStG-E into the Income Tax Act, codifying a clear principle: a contractual division agreed by buyer and seller will be accepted as long as it does not fundamentally deviate from actual market values.

The allocation must reflect the ratio of fair market values. This responds to recent court rulings — notably a decision by the Berlin-Brandenburg Finance Court on 8 October 2025, which stressed the high evidentiary standard for expert appraisals and warned against double-counting renovation costs and development potential.

AI Tools Get a Legal Green Light

The tax authorities themselves are not left out. A new Section 29c of the Fiscal Code creates the legal basis for the increased use of artificial intelligence in administrative procedures — for example, to flag anomalies or automate routine checks. The draft does not specify technical details but gives the finance ministry scope to issue regulations.

Coalition Eyes Income Tax Reform Alongside the Bill

Separately from the formal legislative process, the governing black-red coalition is negotiating a broader income tax overhaul also targeted for 1 January 2027. The goal is to relieve lower and middle earners. The basic personal allowance for 2026 stands at 12,348 euros, and discussions revolve around raising it further and shifting tariff thresholds.

The cost of such a reform is estimated at 20 to over 30 billion euros. A final decision is expected by mid-July 2026.

EU Court Ruling Gives Immediate Liquidity Boost

Independent of the draft law, companies are already benefiting from a judgment by the European General Court dated 11 February 2026. The court ruled that input VAT deduction is permissible in the month the service is performed — as long as the invoice is received before the tax return for that period is filed.

Previously, the invoice had to be in hand by the last day of the service month. Removing this rigid deadline gives businesses a tangible cash-flow advantage, especially in months with high volumes of incoming invoices.

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