How much does it cost to build an expense claims app?
The cost of a custom expense app depends on functionality, integrations and the number of users. In this article we set out all the cost factors, so you can form a realistic picture before speaking with a development agency.
Six factors that determine the price of your expense app
There is no fixed price for an expense app. The cost is driven by the features you need, the systems that must be integrated and the scalability requirements. Below we explain the six main cost drivers.
Core functionality
Photographing receipts with OCR recognition, manual entry of amounts, categorisation of expenses and submitting claims form the basic features. The more automation you want (for example automatic categorisation using machine learning), the greater the development effort.
Approval workflow
A simple expense app sends everything to the person responsible for finance. A more advanced version has hierarchical approval levels, budget limits per department, automatic routing based on amount or category, and escalation paths when limits are exceeded. Every additional step in the workflow means additional logic in the backend.
Accounting integration
Most organisations want expense claims to be posted automatically to their accounting system. An Exact Online integration, Snelstart or AFAS integration is often the biggest technical challenge and therefore a significant cost driver.
Choosing a platform
Do you need native iOS and Android apps, or will a Progressive Web App (PWA) that runs in the browser suffice? A cross-platform solution with Flutter can serve both platforms from a single codebase, which reduces the initial costs compared with two separate native apps.
Number of users and roles
An app for 20 employees has different requirements from one that must serve 2,000 users. Role management (claimant, line manager, financial administrator, controller) calls for an authorisation structure. With large numbers of users, load testing, caching and database query optimisation come into play.
Compliance and retention periods
The Dutch Tax Authority sets requirements for the digital retention of receipts. Expense claims must be kept for seven years, and the integrity of the original image must be guaranteed. Audit logging, version control and an immutable archive are not nice-to-haves but legal requirements that shape the architecture.
Three types of expense app and their scope
Not every organisation has the same needs. Below we compare three common variants: from a simple receipts app to a full expense management solution. The scope largely determines the budget.
Basic receipts app
Focused on digitising receipts and submitting simple expense claims. Suitable for small teams who want to replace their paper expense process with a mobile solution.
- OCR scanning of receipts
- Manual entry of amounts
- Simple category classification
- Email notification on submission
- Export to CSV or PDF
Expense platform with workflows
A full-featured platform with approval workflows, budget management and accounting integration. Suited to mid-sized organisations that want control over their expenses policy and automatic posting.
- All basic features plus:
- Hierarchical approval workflow
- Budget limits per department
- Integration with Exact, AFAS or Snelstart
- Dashboard for financial management
- Mileage tracking with GPS
Enterprise expense management
A scalable solution for large organisations with complex expense scenarios: multiple entities, international currencies, credit card feeds and advanced compliance requirements. Often with SSO integration and extensive reporting.
- All platform features, plus:
- Multi-entity and multi-currency
- Credit card feed integration
- SSO via Azure AD or Okta
- Advanced reporting and analytics
- Automatic VAT detection by country
- API for third parties (payroll, travel management)
How the development process affects costs
The development process for an expense app consists of several phases, each of which contributes to the overall budget. An agile approach with clear sprints gives you insight into costs along the way and the opportunity to adjust course.
1
Discovery and requirements
In this phase we map together which features your organisation needs. Which types of expense are there? Which approval structure applies? Which systems need to be integrated? A thorough discovery prevents costly changes later in the project. Expect an intake workshop and a functional design as the deliverable.
2
UX design and prototyping
User experience is crucial for an expense app. Employees use the app on the go and want to submit a receipt within seconds. The design focuses on a minimal learning curve, fast input and clear feedback on approval or rejection. An interactive prototype lets you test the flow before any code is written.
3
Development in sprints
The build itself takes place in two-week sprints. Each sprint delivers working functionality that can be tested. The first sprints typically focus on the core flow: scanning receipts, submitting expenses, approving them. Later sprints add integrations, reporting and edge cases. This iterative process gives you control over the budget: after each sprint you can decide whether it is sufficient or whether you want to keep building.
4
Testing and handover
For an expense app that handles financial data, thorough testing is essential. Consider functional tests (does the OCR correctly process all receipt types?), security tests (is personal data protected?), performance tests (how does the app behave under peak load at month-end?) and user testing with real employees.
5
Launch and onboarding
The go-live involves rolling out the app to the app stores or your internal distribution channel, migrating any historical data and training key users. A phased rollout by department reduces risk and gives you the chance to act on feedback before the whole organisation switches over.
Integrations: the hidden cost driver
The cost of an expense app often lies not in the app itself but in its integrations with existing systems. Below are the most common integrations and what they involve.
Accounting
Integration with your accounting system
Automatically post expenses as journal entries in Exact Online, AFAS, Snelstart or Visma. Each system has its own API structure, and mapping expense categories to ledger accounts requires alignment with your finance department.
HR system
Employee data and organisational structure
The approval workflow needs to know who reports to whom. An integration with your HR system (HoorayHR, AFAS HRM, Personio) synchronises the organisational structure automatically, so approval routes are always up to date when staff changes occur.
Identity
Single sign-on (SSO)
For organisations using Microsoft 365 or Google Workspace: SSO lets employees sign in with their existing work account. Azure AD, Okta or Google Identity can be connected via OAuth 2.0 or SAML. This increases adoption and simplifies account management.
OCR
Receipt recognition and data extraction
OCR technology reads the amount, date, VAT and supplier name from a receipt. Services such as Google Vision API or Azure Cognitive Services offer pre-trained models. For Dutch receipts, fine-tuning is often needed: think of till receipts with varying layouts and thermal fading.
Payment
Reimbursement and payroll processing
Approved expense claims need to be paid out. This can be done through an export to your payroll provider (ADP, AFAS Payroll, Visma Nmbrs), through SEPA batch payments or through a direct integration with your bank account. The complexity depends on how automated you want the payment process to be.
Notifications
Push notifications and communication
Employees and approvers want to be informed in real time about new claims, approvals and rejections. Push notifications (via Firebase or APNs), email alerts and integration with SendGrid or Slack ensure that nothing gets left behind.
Ongoing costs after go-live
The initial development costs are only part of the overall picture. After launch, your expense app will need ongoing maintenance. It is wise to factor these costs into your budget from the outset.
- Hosting and infrastructure — Server costs, database hosting, storage for receipt images and backups. Cloud platforms such as AWS or Azure scale with usage, but there are always base costs.
- App store maintenance — Apple and Google regularly require updates to remain listed in their stores. The app must be updated at least twice a year to support new OS versions.
- Security updates — Dependencies and frameworks receive security patches that you must apply. For an app handling financial data, this is non-negotiable.
- Monitoring and support — Error tracking, performance monitoring and a helpdesk for users who get stuck. Without monitoring, you only notice problems when employees start complaining.
- Third-party licence fees — OCR services, notification services and accounting package API licences. Many of these services charge per processed document or per API call.
- Functional development — After the first launch, requests always follow: a new expense category, an additional report, support for foreign receipts. Keep budget available for at least two sprints of further development per year.
- Compliance updates — Changes in tax regulations (VAT rates, retention obligations, Tax Authority requirements) must be implemented in good time. The Dutch Tax Authority (Belastingdienst) regularly updates its invoice requirements.
- Scaling — If your organisation grows or you roll the app out to other business units, scaling may be needed: more server capacity, additional language support or further integrations.
Estimating monthly maintenance costs
A good rule of thumb: budget for maintenance and management costs that, on an annual basis, amount to a fraction of the initial development costs. The exact ratio depends on the complexity of your integrations and the number of users. Always ask your development partner for a maintenance estimate with the quote, so you are not caught out by surprises.
Custom expense app versus off-the-shelf solution
Before investing in custom development, it is worth weighing whether an existing SaaS solution would suffice. Both routes have advantages and disadvantages that directly affect your costs.
When standard software is enough
SaaS expense tools such as Declaree, Rydoo or SAP Concur offer ready-made functionality for a fixed fee per user per month. They are suitable when your expense process is relatively standard: submitting receipts, simple approval, and export to a widely used accounting package.
The advantage is a low entry threshold and no initial development costs. The drawback: you are tied to the vendor's functionality and roadmap. Specific workflows, non-standard integrations or industry-specific requirements are often impossible or only partly achievable.
When custom development is the better choice
Custom development is the better route when your organisation has specific requirements that no standard tool covers. Think of: a complex approval matrix that differs per entity, integration with a niche accounting system, industry-specific expense types (e.g. tolls and trailer parking costs in the transport sector), or the wish to offer the app in your own corporate branding.
With custom development, you retain full control over functionality, data and the roadmap. In the longer term, custom development can be more cost-effective than a SaaS licence for hundreds of users. There is also no dependency on the vendor's roadmap or pricing changes.
Our recommendation
Always start with an honest analysis of your requirements. We only recommend custom development when standard solutions do not fit your workflows, integration needs or scaling requirements. In a no-obligation consultation, we help you determine which route is most cost-effective for your organisation.
Expense apps by industry: what makes the difference?
The cost of an expense app varies considerably by industry, as each sector has its own expense types and compliance requirements. Below we outline three common scenarios.
Construction and civil engineering
Construction projects generate expense claims across multiple sites at once. Think of material costs, travel to changing project locations, tolls and equipment rental. The app must work offline (no signal on building sites), allocate expenses to projects and offer integrations with project administration systems.
Transport and logistics
Drivers and field staff claim fuel, tolls, parking and accommodation costs across several countries. Multi-currency support, automatic VAT recognition per country and GPS-linked mileage tracking are standard requirements here. A courier app or logistics platform can be integrated with this.
Professional services
Consultants, accountants and lawyers mainly claim travel and accommodation costs, meals and client entertainment. The challenge lies in allocating costs to specific client projects or matters, so that recharging is accurate. Integrations with time recording and CRM systems are valuable here.
Frequently asked questions about expense app costs
What drives the cost of an expense app the most? +
The two biggest cost drivers are accounting integration and the approval workflow. A simple app with manual export is considerably cheaper than one that posts in real time to Exact Online and supports complex approval hierarchies. The choice of platform (native vs. cross-platform) also plays a role.
How long does it take to develop an expense app? +
The timeline varies with scope. A basic receipt app can be live within a few sprints. A comprehensive expense platform with multiple integrations, role management and compliance requirements requires a longer process. An agile approach allows a first working version to be rolled out quickly, then expanded step by step.
Can I start with an MVP and expand later? +
That is exactly what we recommend. Start with the core flow (scanning receipts, submitting an expense, simple approval) and validate with your users. Based on feedback, you expand the app with advanced features, integrations and reporting. This spreads the cost and reduces the risk of building functionality nobody uses.
Which accounting packages can be integrated? +
We have experience with integrations to Exact Online, Snelstart, AFAS, Visma, Twinfield and SAP. Most Dutch accounting packages offer an API that allows expense claims to be forwarded automatically as journal entries. The availability and quality of the API determine the complexity of the integration.
What about GDPR and retention periods? +
Expense claims contain personal data and financial information. The GDPR requires a data processing agreement, appropriate security measures and data minimisation. In addition, financial records must be retained for seven years under tax law. The app must archive receipt images and metadata in an unalterable form and maintain an audit trail.
Is OCR reliable enough for receipts? +
Modern OCR services recognise structured receipts with high accuracy. Accuracy drops with thermal till receipts (which fade) or handwritten chits. A good expense app lets the user verify the result and correct it manually. Machine learning models trained on Dutch receipt formats improve recognition significantly.
Discuss a budget for your expense app?
We are happy to think along with you, without obligation, about the scope, technical feasibility and realistic budget for your expense app. Whether you want a simple receipt app or a complete expense management platform, we always start with your specific requirements.
✓ No-obligation advisory call
✓ Transparent cost breakdown
✓ Agile development in sprints
✓ Experienced with accounting integrations
Expense claims and worked hours often go hand in hand; see also our complete guide to time-tracking apps.