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.

Key takeaways

• What is it? A forward look at every expected cash inflow and outflow by payment date, usually over 13 weeks (one quarter).
• Why? Profit ≠ cash in the account. Liquidity planning surfaces the squeeze weeks ahead – enough time to act.
• Mandatory? For GmbH and UG directors, effectively yes: § 1 StaRUG has required documented crisis early-warning since 2021. Skipping it exposes you to personal liability.
• How? Opening balance + expected inflows − fixed costs − variable costs − taxes = closing balance per week.
• Metric #1: Runway = cash on hand ÷ burn rate. Below three months is the danger zone.

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.

There are two methods:

• Direct method: you list every expected inflow and outflow individually by due date. Labor-intensive but accurate – and the only sensible choice for the short-term weekly plan of a small business.
• Indirect method: you derive cashflow from a projected P&L and balance sheet (profit + depreciation ± changes in working capital). Faster but coarser – common in groups with many entities.

For a GmbH with one account and for the self-employed, the direct method is the standard, and it's what this article describes.

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?

Is liquidity planning mandatory?

For sole traders and freelancers there's no statutory duty – but every bank asks for it in a credit conversation, and without it you're flying blind.

For corporations it's different. Since 1 January 2021, § 1 StaRUG has required the directors of limited-liability entities (GmbH, UG, AG) to continuously monitor for developments that threaten the company's survival and to run a crisis early-warning system. In practice, a documented, rolling liquidity plan is that early-warning system. If a director culpably breaches this duty and the company slides into insolvency, they face personal liability toward the company. For UG and GmbH founders, liquidity planning isn't a nice-to-have – it's part of the director's duties.

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. One week's closing balance is the next week's opening balance.

Worked example: when the line dips below zero

A small GmbH starts a quarter with €30,000 in the bank. On paper everything's fine – but in week 7 the VAT return, payroll tax, and the quarterly prepayment land almost together while two large customer invoices are still open. The liquidity line tips below zero:

Without a plan you notice the gap when the direct debit bounces. With one, you see week 7 back in week 1 – and pull an invoice forward or arrange an overdraft line.

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 and write them off cleanly – see writing off bad debt in a GmbH.

The starter book for your self-employment

Free e-book: registration, accounting, your first invoice, and taxes, plus a tax calendar, deductions cheat sheet, and invoice template.

Email *

Company website

I want to receive the starter book and agree that Norman may send me related emails with tips and product info. Details in the privacy policy. Unsubscribe anytime. *

Get the free book

Three metrics that actually matter

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

• 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.

If you want more precision, add the liquidity ratios from the balance sheet: first-degree liquidity (cash ÷ current liabilities, target > 20%), second-degree (plus receivables, target > 100%), and third-degree (plus inventory). For day-to-day steering, runway is enough – the liquidity ratios are more for the annual accounts and the bank.

Squeeze ahead – what actually helps

The value of the plan is the lead time. As soon as the line heads toward zero, you have six levers:

1. Invoice earlier. Don't batch at month-end – bill right after delivery.
2. Shorten payment terms and offer an early-payment discount (Skonto) to reward fast payers.
3. Chase open items. Sending a payment reminder on time pulls cash in faster than any bank.
4. Request a tax deferral if a prepayment tips the week negative.
5. Negotiate an overdraft line as a buffer while the numbers still look good – not once you're already in the squeeze.
6. Defer spending: move non-urgent purchases into a cash-rich week.

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.

Frequently asked questions

What's the difference between liquidity planning and financial planning?

Financial planning is the umbrella term and covers revenue, cost, and investment planning over months or years. Liquidity planning is one part of it and answers a single question: is there enough cash in the account at every point in time? It works on a shorter horizon and on pure cashflow.

How often should I update the liquidity plan?

On a rolling basis, at least once a week. Each update drops the week that just passed and adds a new one at the end, so the horizon always stays 13 weeks. When cash is tight, a daily update is worth it.

How far into the future does liquidity planning need to reach?

For operational steering, 13 weeks is enough. Note for insolvency risk: for impending illiquidity, § 18 InsO uses a forecast horizon of usually 24 months. For the pure insolvency test under § 17 InsO, illiquidity exists when you can't settle more than 10% of your due liabilities within three weeks.

Do I need software for liquidity planning?

No, a clean Excel sheet is fine to start. But once you have more than a handful of transactions a week, manual re-keying becomes error-prone. That's where AI bookkeeping takes over the categorizing and slotting automatically from the bank feed.

Does an open invoice already count as liquidity?

No. In liquidity planning an invoice only counts on the date the money is expected to arrive – realistically, based on payment behavior, not the agreed payment term. That's exactly what sets it apart from the P&L.