Often difficult today
- Documents are requested repeatedly
- Questions disappear in email threads
- Nobody immediately sees who must act
- Clients regularly ask for the status
Work and communication platform for firms
Clarity between firm and client.
MainTax brings documents, questions, tasks, deadlines, approvals and processing status together—so both sides know what is open and who acts next.
Your own demo firm · instant access · no credit card · realistic sample data
Less chasing. Less searching. More clarity in every engagement.
The real loss of time
The actual work often starts before the tax return.
Where is the receipt? Has the client replied? Who checks the new upload? Which deadline is becoming critical? Is the month-end complete? And who is waiting for whom?
Maintax Central makes these open points visible before they interrupt the working day.
Maintax Central does not replace DATEV.
Maintax Central replaces the chaos before and around it.
Who MainTax is built for
For firms where too much still happens in the inbox.
When email, phone calls, scattered uploads and spreadsheets shape collaboration, MainTax creates one shared work status.
With MainTax
- Open items structured
- Responsibilities clear
- Reminders traceable
- Processing status transparent
Tax firms
Documents, questions, responsibilities and client status in one place.
Accounting offices
Track monthly documents, missing receipts, approvals and communication centrally.
Payroll offices
Coordinate payroll changes, missing information, approvals and deadlines.
The Maintax Central difference
Every item knows whose turn it is.
Every open item has clear ownership. Your team immediately sees whether the firm must act, a client response is missing or no further step is currently required.
Once the bottleneck is visible, your team can prioritise instead of merely reacting.
Firm is waiting for client
A document, answer or approval is missing.
Client is waiting for firm
Your team must review, answer, approve or start the next step.
No action required
The item is complete, clear and has no current blocker.
Status instead of status requests
Clients no longer need to ask: “What is the status?”
Both sides see the current processing status, open steps and next responsibility. Internal firm notes remain internal.
- Current processing status
- Next step
- Missing documents
- Responsible side
The complete work status
One engagement. One record. The complete picture.
Contacts, documents, questions, tasks, deadlines, assessments, internal notes and next steps stay connected in one place. Your team sees what is missing, who owns it and what happens next.
- Process status and next step
- Risks and open blockers
- Contacts and delegates
- Documents and document packages
- Tasks, questions and follow-ups
- Deadlines and assessment review
- Annual overview
- Tax authority record
- Complete history
Documents without email chaos
Documents arrive where they are needed.
Clients submit documents through the portal, a secure upload link or their personal upload address. Maintax Central connects each incoming item to the client, period and process.
- Inbox+ for new arrivals
- Secure upload links
- Personal upload address
- Email attachment import
- PDF and image preview
- Comments, tags and links
- Document status and approvals
- Identical-file detection
- Document packages by period
June bookkeeping
8 of 10 documents received
Uploads are technically checked and processed in a controlled way before release.
Communication in context
No question loses its context.
Messages, questions, comments, tasks and approvals stay connected to the engagement and its process. Nobody has to search old email threads to understand the next step.
- Team and client communication
- Assigned owner
- Priority and due date
- Attachments in context
- Communication centre
- In-app and email notices
- Web push and digests
- Quiet hours and device management
External notifications remain intentionally neutral. Confidential details are visible only after signing in.
Standardise recurring work
Recurring work becomes a reliable process.
Templates, rules, reminders and bulk actions make firm work repeatable. Execution, results and errors remain traceable.
Trigger
Condition
Action
Result
- Workflow rule library
- Visual rule editor
- Copy and import rules
- Activate several rules together
- Safe test run
- Execution logs
- Error status and required action
- Bulk actions
- Saved filter views
Deadlines with ownership
Deadlines are not only stored. They are managed.
Maintax Central connects tax deadlines with status, owner, reminder and escalation. Your team sees which deadline creates work today.
- 110 prepared deadline templates
- Automatic deadline creation
- Deadline calendar
- Traffic-light status
- Ownership
- Quick actions
- Reminder history
- Escalation levels
- Payment and filing dates
More than 14 days
Monitor calmly
7 to 14 days
Prepare
1 to 6 days
Prioritise
Overdue
Immediately visible
From incoming assessment to decision
Review assessments, see variances and secure deadlines.
Receipt date, expected amount, assessed amount, variances, appeal deadline and client communication remain connected in one traceable review process.
- Record incoming assessments
- Keep appeal deadlines in view
- Compare expected and assessed amounts
- Flag variances
- Assign questions
- Prepare client communication
- Complete and document the review
Simple for clients
Clients do not see firm complexity. Only their next step.
Upload a document. Answer a question. Review an approval. Check the status. Maintax Central shows every client exactly the tasks and information intended for them.
1Upload document
2Answer question
3Review approval
- Personal invitation
- Simple onboarding
- Role-based view
- Upload-only and read-only access
- Open tasks
- Messages and questions
- Approvals and documents
- Readability settings
- Multilingual interface
One platform, eleven languages
Your firm works in German. Your clients understand Maintax Central in their language.
Navigation, tasks, uploads, status messages and system notices appear in each user’s preferred language.
Deutsch
English
Español
Türkçe
العربية
中文
Français
Italiano
Polski
Українська
Русский
The interface is multilingual. Professional content, individual messages and tax-relevant statements are written by the firm and are not translated automatically without review.
Privacy by technology
Privacy is not a footer statement. It is built into the system.
Maintax Central restricts access to the people who need it for their work. Sensitive actions receive additional protection, support access is time-limited and relevant changes remain traceable.
- Technical separation of firms
- Two-factor authentication
- View and revoke sessions
- Additional confirmation for sensitive actions
- Time-limited access grants
- Controlled support sessions
- Protected document storage
- Traceable audit history
- Retention and deletion workflows
- Privacy requests and data export
Clear division of responsibilities
MainTax complements DATEV—it does not replace it.
DATEV and other specialist systems remain responsible for professional tax work. MainTax organizes collaboration before, between and around it.
Client
MainTaxDocuments · Questions · Tasks · Deadlines · Approvals · Status
DATEV / specialist systemAccounting · Payroll · Tax · Closing · Submission
MainTax is an independent complement and not a DATEV product.
Make invisible costs visible
What does daily chasing cost your firm?
Small questions look harmless. Over a year, they turn into hundreds of hours of firm time.
Items per day × minutes × working days ÷ 60
Estimated hours per month60 h
Estimated hours per year720 h
Estimated internal time cost per year28.800 €
Equivalent working weeks18
All values are model calculations and may differ for each firm.
Plans for every firm size
A plan that grows with your firm.
Start with a personal seven-day demo, then choose the plan that fits your team, client base and way of working.
Starter
For small firms that want to organize documents, deadlines, and evidence in one place.
99
€
per month
Net price plus VAT
per year: 990 € · 2 months free
- 75 clients
- 5 staff members
- 150 client users
- 5 GB storage
- 1 mailbox
- Standard support
- Custom domain
- 7-day free trial
Included features
- Documents
- Missing documents
- Inbox+
- Deadline book
- Monthly closing
- Audit trail
- Exports
Professional
For growing firms with automations, upload mailboxes, client status, and advanced roles.
249
€
per month
Net price plus VAT
per year: 2.490 € · 2 months free
- 250 clients
- 20 staff members
- 500 client users
- 25 GB storage
- 3 mailboxes
- Priority support
- Custom domain
- 7-day free trial
Included features
- Documents
- Missing documents
- Inbox+
- Deadline book
- Monthly closing
- Organizers
- Client status
- Upload mailboxes
- Secure upload links
- Audit trail
- Exports
- Imports
- Knowledge base
- Tax news
- Firm branding
- Custom domain
- Advanced roles
- Support access
Enterprise
For large firms with expanded limits, API access, and enterprise support.
599
€
per month
Net price plus VAT
per year: 5.990 € · 2 months free
- Unlimited clients
- Unlimited staff members
- Unlimited client users
- 100 GB storage
- 10 mailboxes
- Enterprise support
- Custom domain
- 7-day free trial
Included features
- Documents
- Missing documents
- Inbox+
- Deadline book
- Monthly closing
- Organizers
- Client status
- Upload mailboxes
- Secure upload links
- Audit trail
- Exports
- Imports
- Knowledge base
- Tax news
- Firm branding
- Custom domain
- Advanced roles
- Support access
- API access
Active public plans from Maintax Central plan administration.
Frequently asked questions
Built for real tax firms. Straight answers without sales talk.
Maintax Central does not change professional tax work. It organises the processes before, around and after it. Here are answers to the questions firms actually ask before getting started.
Will clients actually use it?
Clients do not see the firm’s complexity. They only see which document is missing, which question is open and what they need to do next.
When everything is already fully organized
If the firm and its clients already manage documents, tasks, questions and status information in a structured way with little manual coordination, the additional benefit may be smaller. DATEV and other specialist systems remain responsible for professional tax work. MainTax organizes collaboration before, between and around it.
How much work is the implementation?
Clients, staff, document types and basic status data can be prepared and imported. The exact effort depends on the size of the firm, its data and the chosen scope.
Can I try Maintax Central myself before buying?
Yes. You receive a personal demo firm with realistic sample data and can test Maintax Central for seven days without a credit card.
What do my clients see?
Clients only see content released for them: open tasks, missing documents, questions, approvals, status and documents. Internal notes and administration remain hidden.
How do documents enter Maintax Central?
Documents can arrive through the portal, a secure upload link, a personal upload address or a configured mail import. Each arrival is assigned to the relevant client and process.
How does “Who is waiting for whom?” work?
Every open item shows whether the firm must act, a client response is missing or no action is currently required. Blockers and the next owner are visible immediately.
How does Maintax Central support deadline work?
Deadlines are managed with status, traffic light, owner, reminders and escalations. The firm remains responsible for professional review, deadline calculation and correct data maintenance.
Can Maintax Central automate recurring processes?
Templates, rules, reminders and bulk actions make firm work repeatable. Execution, results and errors remain traceable.
How is access controlled?
Access is limited by firm, role, permission and client assignment. Sensitive actions may require an additional confirmation.
How does Maintax Central protect sensitive data?
Maintax Central combines private file storage, role-based access, signed links, session and upload controls, and audit logs. Production infrastructure and legal configuration still require separate approval.
What happens after cancellation?
Access, export options, retention and deletion follow the contract and legal obligations. Data is not deleted uncontrollably simply because cancellation was initiated.
Try Maintax Central yourself. No appointment and no sales call.
Create your personal demo firm in a few minutes and test Maintax Central for seven days with realistic sample data.
No credit card · instant personal access · prepared sample dataLarger firms or organisations with individual requirements can also request a personal consultation.