IT consulting & software development: Project accounting & VAT on digital services

Published 11 March 2026

Table of contents

• What is IT consulting accounting?
• How project accounting works for software development
• What VAT applies to digital services in the UK
• Important features in accounting software for IT consultants
• Make IT consulting accounting easier with Xero
• FAQs on IT consulting accounting

Key takeaways

• Complex IT consulting projects are difficult to keep up with. Tracking time effectively can help you bill accurately, simplify your financial management, and get you a clearer picture of your project’s profitability.
• IT consultants also need to think about VAT. Although the rules for place of supply are slightly different for digital service providers, you should apply the standard 20% VAT rate for business and non-business clients in most cases.
• By using the best accounting software for consultants, UK IT professionals can get more time for their client projects. Look out for packages that include time tracking, online invoicing, bank connections, and online payments.

What is IT consulting accounting?

IT consulting accounting is a specialised approach to managing your finances.

It’s not just about tax compliance and bookkeeping for IT consultants – IT consulting accounting is about dealing with project-based income, managing VAT on digital services, and tracking client work and costs precisely. Together, these help you get the numbers right and grow your cash flow. This in turn, gives you more time to work on projects with your clients and help them achieve better results.

How project accounting works for software development

Managing multiple complex IT projects so that you’re protecting profit and billing accurately is vital for cash flow. Using project accounting software, UK IT consultants can save time and simplify some of these tasks. Here’s how to approach project accounting so that you can grow your profit and keep clients happy.

Capturing time and costs to projects

If you charge for time and costs, you need to track these accurately.

Tracking time and costs helps you understand:

• whether the project you’re delivering is profitable and valuable for your business and clients
• how efficient your team is, where productivity lags, and which parts of a project take the most time and slow progress

Modern time tracking software lets you capture hours and assign them to specific projects and tasks. This is helpful if you’re billing based on milestones or providing itemised invoices that specify the deliverables a client is paying for.

Billing milestones, retainers, and time and materials

There are plenty of ways to structure your billing schedule. For example, you might split a cloud migration project up into several phases, billed to clients in monthly installments.

Here are some ways you can bill your clients:

• A percentage upfront, the rest on completion: Some consultancies bill clients an upfront percentage, or charge a deposit up front, with the rest of the fee paid on completion or across the project lifecycle. This means you receive an immediate injection of cash once work is agreed.
• Milestone-based billing: If a project has clear phases – like an audit or assessment phase, followed by planning and execution stages – you could choose to charge an amount towards the total project fee with each stage you complete, until the job is finished.
• Time and materials billing: This is a straightforward way to bill clients. You add up the time and materials used for the project and add a percentage profit on top, giving you the total project fee. The benefit is that all the hours worked are billed for, but the drawback for clients is that project fees can be unpredictable.
• Retainers: If you work regularly with a client across multiple projects, you could offer them a retainer. This is where they pay a fixed amount each month for a specific number of hours, days, or deliverables. Retainers guarantee a consistent amount of income each month, so they’re great for cash flow.

Viewing project profitability and progress

If you’ve tracked time and costs accurately, you can compare this to your estimation to see if you’re on track for profit. At the end of a project, you can also work out profitability with a simple calculation:

Gross profit = revenue – cost of sales

It’s up to you to decide what percentage profit makes a project worthwhile. If you’re using modern time tracking and billing software for consultants, you might be able to view project profitability and work in progress (WIP). Depending on your accounting software, you may have access to time-tracking features where you can capture hours worked and costs incurred, and pull up profitability reports to see how your firm is performing. You may also be able to check the project’s progress against the original budget to make sure you’re on track for a healthy profit.

What VAT applies to digital services in the UK

When it comes to VAT for IT consultants, UK rules can be complex. Your IT consulting firm’s services may be classified as digital services for VAT. A digital service includes things like:

• the supply of software or software updates
• distance maintenance of programmes and equipment
• website hosting services

Check the examples of digital services on the GOV.UK website to see if what you offer falls within this category.

Digital services supplied to UK private consumers and business customers are subject to VAT at the standard rate of 20%. Any digital services you provide to customers outside the UK are not liable for UK VAT, but you may need to register for and pay VAT in the country where your customer is based.

How place of supply rules affect invoicing

The place of supply rules determine where you should pay VAT. For B2B digital services, the place of supply is where the customer is based:

• For UK-based customers, you apply the standard rate of VAT: 20%.
• If a B2B customer is based overseas, they’re responsible for accounting for VAT under the reverse charge mechanism, in accordance with their local tax authority’s rules.
• If a B2C customer is based overseas, you may need to register for VAT and follow the local rules in their country.

How you can use EU OSS for digital services

If you have B2C customers in the EU, you can use the EU’s One Stop Shop (OSS) system for declaring VAT. This simple option saves you having to register for VAT in multiple EU member states. Instead, you register for VAT in just one member state, and submit a single calendar quarterly return for VAT on all B2C supplies of digital services across the EU.

Here’s more information on the EU OSS system and how to register from the European Commission.

Important features in accounting software for IT consultants

Modern accounting software helps you manage more than just compliance. You can use it to get clearer on your finances and project performance, automate admin tasks that keep you from clients, and make projections for the future of your firm. Here are some features in accounting software for IT consultants that can make your life easier:

Tracking time and approvals

Tracking your project time helps you:

• monitor your project progress, task efficiency, and even profitability
• bill accurately and ensure you’re recuperating all your costs
• decide whether similar projects are worth taking on in the future

Look out for time tracking and billing software for consultants that combines with accounting tools, so you can create invoices using timesheets already in the system. This will save you time on invoicing admin and ensure work you’ve delivered isn’t missed off the bill.

IT consultancies can also benefit from accounting software that has a simple, secure approval process. An approval process gives you confidence you’re keeping up with bills, purchase orders, and supplier invoices, and prevents errors like incorrect payments or double payments.

Some approvals software automatically notify the right people when a purchase order or invoice needs approving, so you can fast-track bills for payment and save time chasing approvers.

Speeding up reconciliation with bank feeds

There’s more time for projects when you automate the routine tasks like bank reconciliation. Modern accounting software lets you connect your business bank accounts and import transactions automatically. Your bank transactions now appear in your accounting system, so you can reconcile statement lines on the spot, making bookkeeping tasks more manageable.

You may even find accounting software that can recommend matches for statement lines, which speeds up reconciliation further, and helps you get a clearer view of your financial picture.

Improving cash flow with online payments

Accounting software that lets you offer online payments to your clients can help improve your cash flow. Clients are more likely to pay you sooner if you make it easy for them. Depending on the accounting software, you clients may be able to pay straight from the invoice using their card or direct debit.

Managing multi-currency and foreign exchange

Software that handles clients who work in foreign currencies helps you take advantage of overseas opportunities.

Multicurrency accounting software automatically converts currency and records the transactions accurately, so the right amounts are logged in your software. It updates exchange rates as they change so you always know how your cash flow is faring in all currencies. And you can also produce reports in multiple currencies, to check your performance and profitability is where you expect it to be.

Make IT consulting accounting easier with Xero

Xero is modern accounting software designed for consultants. It helps simplify your financial processes and save time on your admin.

Xero makes it easier to send VAT invoices and accept online payments, track hours and costs for every project, and get a clear view of how profitable the work is.

Get one month free

FAQs on IT consulting accounting

Brush up on IT consulting accounting basics:

Is IT consulting a digital service for VAT?

Yes – generally speaking, IT consulting is considered a digital service for UK VAT rules. But since every consultancy is different, it’s worth checking your specific services against government digital services guidance to make sure you’re following the right rules.

Do I charge VAT to EU clients for B2B and B2C work?

No. You don’t charge UK VAT to EU clients for B2B and B2C work, but you may need to follow local tax rules in the country where your client is based. If you’re not sure, check the UK government’s place of supply guidance, and the tax rules in your client’s location.

How do I invoice in multiple currencies?

With most accounting software, you just need to create a separate invoice for each currency. For example, if you need to invoice one client in USD, EUR, and GBP, you should create an invoice in each currency. Make sure the currencies you want to use are set up in your accounting system or invoicing software, then select the appropriate currency when creating each invoice.