Tax OS — Tax Advisory Suite

The AI Operating System for Tax Advisory Firms

Automatic assessment comparison, AI-powered tax advice based on EStG/UStG/AO, intelligent deadline cockpit and professional document generation — all in one platform.

35+
Tax Law Norms
AO, EStG, UStG, KStG, GewStG
7
AI Thinking Modes
Advisory to BFH
10
Deadline Templates
VAT to court deadlines
99%
Extraction Accuracy
Assessments & receipts
§ 355 AO § 172 AO § 15 EStG § 18 UStG § 7 GewStG § 8b KStG § 147 AO § 4 EStG § 20 EStG § 21 EStG § 19 UStG § 164 AO § 355 AO § 172 AO § 15 EStG § 18 UStG § 7 GewStG § 8b KStG § 147 AO § 4 EStG § 20 EStG § 21 EStG § 19 UStG § 164 AO

Everything your firm needs

Built for tax advisors, auditors and accountants — not lawyers.

AI-Powered

Tax Assessment AI

Automatic comparison of tax assessments with returns. Detects discrepancies and generates ready-to-file objection letters.

Compliance

Deadline Cockpit

Automatic tracking of all tax deadlines: VAT returns, payroll tax, income tax, corporate tax, trade tax, annual accounts.

Premium

Tax Advisor AI

7 thinking modes: tax advice, audit, accounting, deadlines, objections, tax planning, BFH case law.

Automated

Document Generator

7 professional templates: objection letters, extension requests, client letters, power of attorney, cover letters, expert opinions, fee invoices.

Complete

Mandate Management

Complete CRUD for mandates: income tax, VAT, corporate tax, trade tax, annual accounts, bookkeeping, audits.

DSGVO / GDPR

Privacy & Security

GDPR-compliant, end-to-end encryption, client-separated data storage. Tax secrecy compliant per § 30 AO.

4 steps to the perfect firm

01

Create Client

Tax ID, tax office, assessment years — captured in seconds.

02

Create Mandate

Income tax 2025, VAT Q3, audit — structured and clear.

03

Upload Assessments

AI automatically extracts amounts, tax IDs and periods.

04

Compare & Object

Discrepancies detected instantly. Objection letter at the click of a button.

Objection deadline: 1 month (§ 355 AO)

Never miss an objection again

The assessment checker automatically compares every tax assessment with the filed return. Amount discrepancies, rejected deductions and wrong tax rates are detected instantly — including a ready-to-send objection letter.

Automatic assessment ↔ return comparison
Objection letter per § 357 AO at one click
Suspension of enforcement (§ 361 AO) automatic
Deadline warnings 14, 7, 3 and 1 day before expiry

Detected Discrepancies

Income Tax
Assessment: 12.450,00 € · Return: 11.200,00 €
+1.250,00 €
Home Office (§ 4 Abs. 5 EStG)
Assessment: · Return: 1.250,00 €
Rejected
Solidarity Surcharge
Assessment: 685,00 € · Return: 616,00 €
+69,00 €

What tax advisors say

The assessment checker identified three objections in the first week that we would have missed.
Dr. Sabine Keller
Tax Advisor, Munich
Finally software that speaks the language of tax advisory. No legal jargon, no confusion.
Thomas Bergmann
Auditor, Hamburg
The deadline cockpit brought our compliance rate to 100%. No client misses a VAT return deadline anymore.
Maria Hofmann
Firm Director, Vienna

Ready for the future of tax advisory?

14-day free trial. 14-day money-back guarantee. No credit card required.

14-day free trial · 14-day money-back guarantee · Instant access