Liquidity Planning 2026: Cashflow Forecast for GmbH and Self-Employed in Germany

Companies don't go bankrupt because they're unprofitable. They go bankrupt because they can't pay payroll on the 10th. That's why liquidity planning matters more than the P&L — it tells you whether the cash will actually be there.

What is liquidity planning?

Liquidity planning is a forward-looking forecast of every expected cash inflow and outflow, usually at weekly or monthly granularity. Unlike the P&L (BWA in German), it works on pure cashflow: an invoice counts when the money arrives, not when you wrote it. A tax payment counts the day the Finanzamt actually pulls it.

BWA vs. liquidity planning

The BWA follows accrual accounting: an issued invoice counts as revenue immediately, even if the customer hasn't paid. That distorts the picture — you can show €12,000 in profit on paper and still be unable to wire rent.

Liquidity planning gives you the answer that matters: do I have enough on the 25th to cover salaries? Will the balance cover the VAT return on the 10th? When do I need to send the next invoices?

Building a 13-week cashflow forecast

13 weeks is the industry standard. It covers one quarter, which lines up with VAT filings, corporate tax prepayments, and most bank conversations. Here's how to structure it:

1. Opening balance: current balance across all business accounts.
2. Expected inflows: invoices by due date, not invoice date. Plan around how customers actually pay, not how the contract says they should.
3. Fixed costs: rent, software, salaries, health insurance — anything that hits regardless of revenue.
4. Variable costs: materials, subcontractors, travel — tied to planned projects.
5. Tax payments: VAT, payroll tax, prepayments for income or corporate tax.
6. Closing balance = opening balance + inflows − outflows.

Five common liquidity traps for German founders

These five line items cost German GmbHs and freelancers thousands every year because they get underestimated:

• VAT prepayment: 19% of your revenue is not your money. Forgetting that creates a hole every quarter.
• Income or corporate tax prepayments: quarterly, on March 10, June 10, September 10, December 10. See our tax prepayments guide for details.
• Payroll tax and social security in a GmbH: monthly. Social security is even due on the third-to-last banking day.
• Provisions for year-end accounts, warranties, and probable losses — they reduce profit but also tie up cash. See GmbH provisions.
• Bad debts: statistically 5–10% of receivables never come back. Plan for it.

Three metrics that actually matter

You don't need a controlling degree. Three numbers cover most directors and freelancers:

• Cash on hand: current balance across business accounts.
• Burn rate: average monthly outflows over the last three months.
• Runway: cash on hand ÷ burn rate. A GmbH with €30,000 in cash and a €12,000 burn rate has 2.5 months of runway. Below three months is the red zone.

Automating liquidity planning with AI bookkeeping

Excel-based liquidity planning is manual work: copy bank transactions, categorize them, slot them into the right week. That's exactly the work Norman's AI bookkeeping eliminates. It connects to your business account, categorizes incoming and outgoing transactions automatically, and shows your real-time cashflow.

Tax payments due are calculated from your live bookkeeping data and shown directly in the liquidity view — you immediately see whether the next VAT return is covered.

If you prefer to query liquidity data from the terminal or through an AI agent, Norman also ships a CLI and an MCP server. Your current balance and upcoming tax payments slot directly into your existing workflows.

Bottom line — liquidity beats profit

A GmbH with proper liquidity planning sees the squeeze three months out and can act: invoice earlier, send dunning notices on time, request a tax deferral, negotiate a credit line. Without cashflow visibility, the problem only surfaces when a payment fails.

With AI-powered bookkeeping, liquidity planning stops being extra work and becomes a byproduct of your day-to-day books. Bookkeeping at Norman is free — only tax filing is paid.