Cash vs. Accrual VAT for Your GmbH 2026: Which Method Saves Liquidity?

When does VAT actually become due – when you issue the invoice, or when the customer pays? Every GmbH in Germany has to make this call once, and it directly shapes your cash flow. Picking between cash-basis taxation (IST-Versteuerung) and accrual taxation (SOLL-Versteuerung) can save five-figure amounts of working capital if your customers pay on terms.

In short

• Accrual VAT (SOLL) (default for a GmbH): VAT arises when you issue the invoice, regardless of payment.
• Cash-basis VAT (IST) (application under §20 UStG): VAT arises only when the money hits your account.
• 2026 threshold: previous-year revenue below €800,000 (since 2024, previously €600,000).
• IST advantage: you don't pre-finance the VAT, which protects liquidity on long payment terms and bad debts.
• Switching: only at the start of a calendar year, via a free-form letter to the Finanzamt.

Cash vs. accrual VAT in one sentence

Under accrual VAT (SOLL), you owe VAT to the tax office as soon as you issue the invoice – even if the customer hasn't paid yet. Under cash-basis VAT (IST), VAT only becomes due once the money lands in your account. The default for a GmbH is accrual; cash-basis is a relief under §20 UStG that you have to apply for at the Finanzamt.

Who can switch to cash-basis VAT in 2026?

§20 UStG allows three cases in which the Finanzamt grants cash-basis taxation:

1. Revenue threshold: total revenue in the previous calendar year was below €800,000. This is the relevant case for most small GmbHs and UGs.
2. No bookkeeping obligation under §148 AO: rarely relevant for a GmbH, because §238 HGB requires double-entry accounting anyway.
3. Liberal professions under §18(1) no. 1 EStG: doctors, lawyers, tax advisers and the like can use cash-basis regardless of revenue – but only as individuals or partnerships, not as a GmbH (a corporation).

For a GmbH, the €800,000 threshold is therefore almost always the yardstick. Cross it in the prior year and you switch back to accrual the following calendar year.

What about a new formation?

In the founding year there is no prior-year revenue. Then the projected total revenue of the current year counts, extrapolated to twelve months. Start your GmbH in July and expect €300,000 by year-end, that maps to roughly €600,000 annualised – you stay under the threshold and can apply for IST from day one.

The real reason to choose IST: liquidity

The cash-flow benefit is straightforward. Example: a UG issues a January invoice for €119,000 (€100,000 net + 19% VAT) with 60-day payment terms.

Under accrual you pay the €19,000 a month before the customer transfers the money. A VAT filing extension pushes the due date a month further, but the core problem remains: on long terms you pre-finance other people's money. Under cash-basis that gap disappears entirely.

On a bad debt, cash-basis gives you a second advantage: you don't have to claw back VAT you already paid, because it never became due. Under accrual you would have to adjust the taxable base retroactively under §17 UStG.

Input VAT stays on accrual logic

Important nuance: cash-basis only applies to your output invoices. Input VAT on supplier invoices can still be claimed as soon as the invoice is in hand and the service has been delivered – regardless of whether you've paid yet. Input and output VAT effectively decouple, which improves cash flow further.

Advance payments: the exception both methods share

A common misconception: accrual taxpayers often think VAT only arises with the final invoice. That's not true. If you receive an advance payment before you've delivered or invoiced, VAT arises with the receipt of that money (§13(1) no. 1a sentence 4 UStG). This is the minimum cash-basis rule: even an accrual taxpayer taxes advance payments on receipt. For the portion you collect upfront, the difference from cash-basis disappears.

When accrual still makes sense

Not every small GmbH has to switch. Accrual can be the better default if:

• Most customers pay by direct debit or upfront – there's no liquidity gap to bridge.
• You'd rather avoid the additional reconciliation work between invoices issued and payments received.
• You'll cross the €800,000 threshold this year anyway and want to skip a forced switch in the next one.

Application and switching mechanics

Applying for cash-basis VAT is a free-form letter to your local Finanzamt. The key rules in 2026:

• Submit the application before the start of the calendar year for which IST should apply.
• A switch is only possible at the start of a year, not mid-year.
• Approval comes either in writing or implicitly (the Finanzamt simply accepts your VAT returns under IST).
• If you cross the €800,000 mark, you're automatically back on accrual the next year.

The transition: avoiding double taxation

When you switch from accrual to cash-basis (or back), there's a trap: invoices that straddle the cut-off date. §20 UStG explicitly requires that transactions are neither taxed twice nor left untaxed.

Example: you issue a €10,000 net invoice in December and tax it under accrual in the December VAT return. If the customer only pays in January, after you've moved to cash-basis, that payment must not trigger VAT a second time. You track exactly these legacy items on a transition list so every transaction is taxed exactly once. Clean bookkeeping with both invoice and payment dates makes this automatically traceable.

Impact on your VAT return and bookkeeping

Either way, you still file the VAT return for your GmbH on time. Under cash-basis, you record VAT from payments actually received; under accrual, from invoices issued in the period. Modern AI bookkeeping software applies the right method automatically, posts bank-feed payments with the correct VAT date, and produces the right VAT return – without you tracking it manually.

Official UStVA form (current edition)

The official German advance VAT return form as a PDF, to understand, prepare, and file away.

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Frequently asked questions

Do I have to reapply for cash-basis VAT every year? No. Once granted, cash-basis VAT stays in force until you revoke it or exceed the €800,000 threshold. Only then do you switch back to accrual the following year.

Can a newly formed GmbH apply for IST right away? Yes. In the founding year, projected revenue annualised to twelve months counts. If it's below €800,000, you can apply from day one.

Does cash-basis also apply to input VAT? No. You still deduct input VAT on invoice receipt and delivery of the service, regardless of whether you've paid. IST only affects your output transactions.

What happens to open invoices when switching? Invoices already taxed under accrual before the switch are not taxed again when payment arrives. You keep a transition list so every transaction is recorded exactly once.

Can I switch mid-year? No. A switch between accrual and cash-basis is only possible at the start of a calendar year.

Conclusion: cash-basis is the default for most small GmbHs

If your GmbH stays under €800,000 in revenue and works with payment terms, switching to cash-basis VAT almost always pays off. The cash-flow advantage is real, the operational overhead is minimal – provided you use the right tools. If you already run GmbH bookkeeping in a structured way, the application is a few clicks away and you free up working capital from year one.

With Norman as your tax and accounting platform for the GmbH, the VAT calculation adapts to your chosen method automatically – you keep full control over liquidity and deadlines.