Accounting for SaaS Companies: Getting It Right from Day One

Why SaaS accounting is different

Traditional accounting was designed for businesses that sell products or deliver one-off services. You sell a widget for £100, you recognise £100 of revenue. Simple.

SaaS breaks this model. You are selling access to a service over time. A customer who pays £12,000 upfront for a 12-month subscription has given you £12,000 of cash, but you have only earned £1,000 of it. The remaining £11,000 is a liability — you owe the customer 11 more months of service. This fundamental difference touches every aspect of your accounting.

Getting it right from day one avoids painful corrections later. I have seen companies enter due diligence and discover that two years of revenue has been incorrectly recognised. Restating two years of accounts is expensive, time-consuming, and deeply uncomfortable in front of investors.

Setting up your chart of accounts

Your chart of accounts (CoA) is the structure that organises every financial transaction. A SaaS-appropriate CoA separates the categories that matter for your business model.

Revenue accounts

Do not lump all revenue into a single account. At minimum, separate:

• Subscription revenue — Your core recurring SaaS revenue, recognised monthly
• Professional services — Implementation, onboarding, consulting, training
• Setup / onboarding fees — One-off fees charged at contract signing
• Usage / overage revenue — Variable charges above included tier limits
• Support revenue — If you charge separately for premium support tiers

This separation is critical because investors evaluate each revenue stream differently. Subscription revenue at 80% gross margin is worth far more than professional services revenue at 30% margin.

Cost of revenue (COGS)

These are costs directly tied to delivering your service:

• Hosting and infrastructure — AWS, Azure, GCP costs
• Third-party software — APIs, embedded tools that run your platform
• Customer support team — Salaries for support staff (not customer success)
• Payment processing fees — Stripe, GoCardless fees (typically 1.5-3%)
• Data costs — Third-party data feeds embedded in your product

Operating expenses

Break these into the standard functional categories:

Research & Development:

• Engineering salaries and on-costs
• Product management
• Design
• QA and testing

Sales & Marketing:

• Sales team salaries and commissions
• Marketing team salaries
• Advertising and paid acquisition
• Events and sponsorships
• Marketing software (CRM, email tools)

General & Administrative:

• Finance and accounting (including fractional CFO costs)
• Legal fees
• Office rent and utilities
• Insurance
• Audit fees
• General software subscriptions (Slack, Google Workspace)

Balance sheet accounts

SaaS-specific accounts you will need:

• Trade receivables — Invoices issued but not yet paid
• Prepayments — Costs paid in advance (annual insurance, annual software subscriptions)
• Deferred revenue (current liability) — Cash collected for services not yet delivered
• Deferred revenue (non-current liability) — Deferred revenue due beyond 12 months (multi-year contracts)
• Accrued expenses — Costs incurred but not yet invoiced (bonus accruals, tax provisions)
• VAT liability — VAT collected but not yet paid to HMRC

Revenue recognition

This is the most important and most commonly mishandled area of SaaS accounting.

The principle

Revenue is recognised when it is earned, not when cash is received. For subscription services, revenue is earned ratably over the subscription period.

How it works in practice

Example: £24,000 annual contract, paid upfront on 1 March

• 1 March: Cash in = £24,000 (plus VAT). Deferred revenue = £24,000. Recognised revenue = £0
• 31 March: Recognised revenue = £2,000. Deferred revenue = £22,000
• 30 April: Recognised revenue = £2,000 (cumulative £4,000). Deferred revenue = £20,000
• Continue until 28 February (next year): Final £2,000 recognised. Deferred revenue = £0

The journal entries each month:

• Debit: Deferred revenue (liability decreases) £2,000
• Credit: Subscription revenue (income increases) £2,000

Monthly billing

For monthly billing, revenue recognition is straightforward: the invoice for March is for March's service, so revenue is recognised in March. The only complexity is payment timing — if the customer pays in April, you have a trade receivable in March.

Quarterly and annual billing

These create deferred revenue. The cash arrives upfront, but the revenue is spread over the service period.

Common mistakes

Recognising annual contracts as lump-sum revenue: This is the most common mistake. It overstates revenue in the billing month and understates it in subsequent months. For a detailed look at how this distorts your P&L and every metric built on it, see why SaaS revenue recognition mistakes make your P&L look like a rollercoaster.

Not tracking deferred revenue: If you do not maintain a deferred revenue schedule, you have no way to accurately recognise revenue each month.

Professional services timing: If you charge £5,000 for implementation and deliver it over 3 weeks, revenue should be recognised over those 3 weeks, not on the invoice date.

Deferred revenue: the misunderstood liability

Deferred revenue (also called deferred income or unearned revenue) confuses many founders because it is a liability that represents something good happening — customers paying you in advance.

Think of it this way: the customer has given you cash, but you still owe them service. Until you deliver that service, you have a debt to the customer. That debt sits on your balance sheet as a current liability.

Why it matters

Balance sheet accuracy: Without deferred revenue, your balance sheet overstates equity (because revenue is overstated, inflating retained earnings).

Cash flow understanding: A growing deferred revenue balance means you are collecting cash faster than you are earning revenue. This is healthy for cash flow. A declining deferred revenue balance means the opposite.

Investor scrutiny: Investors will examine deferred revenue closely. A large and growing deferred revenue balance signals strong forward visibility — you have already been paid for future service.

Deferred revenue schedule

Maintain a schedule that tracks, for each contract:

• Contract value and billing frequency
• Start date and end date
• Monthly recognition amount
• Opening deferred balance, additions (new billings), releases (recognition), closing deferred balance

This schedule should reconcile to your balance sheet deferred revenue figure every month.

VAT for SaaS

Registration

You must register for VAT when your taxable turnover exceeds £90,000 in any rolling 12-month period (2025/26 threshold). Most SaaS companies cross this threshold quickly.

B2B vs B2C

UK B2B customers: Charge standard rate VAT (20%). The customer reclaims it on their VAT return.

EU B2B customers: Reverse charge applies. You do not charge VAT. The customer accounts for it in their country.

EU B2C customers (consumers): You must charge VAT at the rate of the customer's country. This requires registration under the OSS (One Stop Shop) scheme or individual country registrations.

Non-EU customers: Generally outside the scope of UK VAT. No VAT charged.

Cash flow impact

VAT is not your money. You collect it from customers and pass it to HMRC (minus the VAT you have paid on your own purchases). But the timing creates a cash flow float: you collect VAT on invoicing but pay it to HMRC quarterly (up to four months later).

Do not plan around this float. It is a temporary timing benefit that can reverse quickly if your sales slow down while your VAT liability remains.

Management accounts

Management accounts are your monthly internal financial reports. They should be produced within 10-15 working days of month-end and include:

P&L (income statement)

• Revenue by stream (subscription, professional services, other)
• Cost of revenue and gross margin
• Operating expenses by category
• EBITDA
• Depreciation and amortisation
• Operating profit
• Interest and tax
• Net profit

Balance sheet

• Current assets (cash, receivables, prepayments)
• Non-current assets (equipment, capitalised development)
• Current liabilities (payables, deferred revenue, tax, accruals)
• Non-current liabilities (long-term deferred revenue, loans)
• Equity (share capital, share premium, retained earnings)

Cash flow statement

• Operating cash flow
• Investing cash flow
• Financing cash flow
• Net cash movement
• Opening and closing cash

SaaS metrics pack

Alongside the financial statements, include:

• MRR / ARR and the waterfall
• Customer count and churn
• NRR and GRR
• LTV:CAC
• Burn rate and runway

Month-end close process

A clean month-end close ensures your management accounts are accurate:

1. Reconcile bank accounts — Every transaction matched, no unexplained differences
2. Review accounts receivable — All invoices raised, ageing reviewed, bad debts assessed
3. Review accounts payable — All supplier invoices entered, accruals raised for uninvoiced costs
4. Process deferred revenue — Run the deferred revenue schedule, post monthly releases
5. Accrue payroll — If payroll runs after month-end, accrue the cost into the correct month
6. Review prepayments — Release prepaid costs to the P&L on schedule
7. Reconcile VAT — Ensure VAT on all invoices is correct, VAT returns filed on time
8. Post depreciation — Monthly depreciation charge on fixed assets
9. Review and approve — Compare to budget, investigate variances, sign off

This entire process should be documented in a checklist that the same person runs every month. Consistency matters more than sophistication.

The foundation for everything else

Accurate accounting is not exciting. But every important financial activity — fundraising due diligence, board reporting, tax compliance, investor updates, and strategic decision-making — depends on it.

If your books are wrong, your management accounts are wrong. If your management accounts are wrong, your metrics are wrong. If your metrics are wrong, every decision you make based on them is built on a faulty foundation.

Get the accounting right from day one. The cost of fixing it later is always higher than the cost of doing it properly from the start.