software · growth · AIVAT invoice generation
Tax invoices, credit notes and simplified invoices with correct VAT, bilingual where needed.
Invoicing & e-invoicing
Custom invoicing software that gets you paid faster.
Monocerix builds custom invoicing software and e-invoicing solutions that issue compliant invoices, collect payments online and chase late payers automatically. We integrate with your ERP, CRM and accounting tools, and keep you compliant with UAE, Saudi and UK rules.
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Cash flow
Invoices sent late get paid later.
Manual invoicing means delays, errors and awkward follow-up calls. Across the Gulf, e-invoicing rules now also require invoices in specific structured formats.
We automate the whole cycle: invoice creation, delivery, payment collection, reminders and reconciliation, with every invoice compliant where you operate.
- Compliant: VAT invoices, ZATCA and UAE e-invoicing
- Faster payment: payment links, cards and bank transfer
- Automatic reminders: by email and WhatsApp
- Synced: with your ERP and accounting system
What you get
Billing software development, built around you.
E-invoicing solution
Structured e-invoices for ZATCA in Saudi Arabia and the UAE Peppol-based model.
Recurring billing
Subscriptions, retainers, usage-based and milestone billing on autopilot.
Payment links
Stripe, Checkout.com, Telr, PayTabs, Network International and bank transfer.
Reminders
Polite, escalating payment reminders on email and WhatsApp.
Accounting sync
Xero, QuickBooks, Zoho Books, Odoo and ERPNext.
Who it is for
Who we build billing systems for.
SaaS & subscriptions
Recurring and usage-based billing, proration, dunning and invoices issued straight from your platform.
Agencies & consultancies
Retainers, milestone billing, timesheets and approvals before an invoice goes out.
Distributors & wholesalers
High invoice volumes, credit limits, statements and e-invoicing for B2B customers in the Gulf.
Clinics & education
Packages, instalments, deposits and payment links sent by WhatsApp.
How we work
Automated billing in 3 to 8 weeks.
Week 1
Map
Billing types, tax rules, approvals and integrations.
Week 2–5
Build
Invoicing engine, templates, payments and reminders.
Week 5–6
Certify & test
E-invoicing onboarding and test invoices.
Go-live
Launch
Go-live, training and monitoring.
Markets we serve
E-invoicing rules by country.
E-invoicing is spreading fast. These are the regimes we work with most.
Saudi Arabia
ZATCA Fatoora Phase 2: XML invoices, cryptographic stamps, QR codes and real-time clearance or reporting. See ZATCA e-invoicing.
UAE
A phased Peppol-based e-invoicing rollout through Accredited Service Providers. See UAE e-invoicing.
UK & EU
VAT invoices, Making Tax Digital records and Peppol where buyers require it.
India
GST e-invoicing and e-way bills for domestic clients.
Thailand
Thai e-Tax Invoice and e-Receipt for the Revenue Department, 7% VAT and PromptPay QR payments.
Buyer guide
Do you need custom invoicing software or an off-the-shelf tool?
When a tool like Xero or Zoho Books is enough
If you send standard invoices and your accounting tool already supports your country's e-invoicing, use it. We can set it up and automate reminders.
When custom billing pays off
Build custom invoicing software when billing is complex (usage, milestones, multi-entity), when invoices must come straight from your own platform, or when you need e-invoicing integration your current tools cannot provide.
What it costs
Automating an existing tool costs $1,000 to $4,000. Custom invoicing and e-invoicing integrations typically cost $5,000 to $25,000.
How e-invoicing changes your invoicing software
Under e-invoicing, the legal invoice is structured data, not a PDF. Your invoicing software must capture complete buyer and item data, produce the required format, send it through the official channel and store the response. Retrofitting this late is expensive, so we design for it from the start.
Starting price: $700 (about AED 2,570) for clients outside India. Every project then gets a written, itemized quote. See all starting prices.
Specialist services
Need something more specific?
Your quotation
A quote built for your exact scope.
Answer a few questions about your invoicing system and you'll get a formal, itemized quotation with scope, timeline, team and milestones, usually within 48 hours. Quotes in USD, AED, GBP or INR.
Plan my invoicing system
WE'LL ASK ABOUT
- Invoice volumes and billing types
- Countries and tax rules
- Payment methods
- ERP, CRM and accounting tools
Takes about 4 minutes. Your answers are saved as you go.
FAQ
Invoicing & E-Invoicing questions, answered.
Straight answers to what clients ask us most. Still curious? Ask us on WhatsApp.
How much does invoicing software cost with Monocerix?
Projects start from $700 for clients outside India. Custom e-invoicing integrations are quoted on scope, usually $5,000 to $25,000.
Can you make our invoices ZATCA compliant?
Yes. We integrate with ZATCA Phase 2, including XML generation, cryptographic stamping, QR codes and CSID onboarding.
Are you ready for UAE e-invoicing?
Yes. We build the data and integration layer to exchange invoices through an Accredited Service Provider under the UAE model.
Can customers pay invoices online?
Yes. Every invoice can include a payment link for card, Apple Pay or bank transfer, and payments reconcile automatically.
Can invoices be bilingual?
Yes. We design English and Arabic invoice templates that meet VAT requirements.
Can you integrate with Xero, QuickBooks or Zoho Books?
Yes. Invoices, payments and credit notes sync to your accounting system automatically, so your accountant works from the same numbers and month-end reconciliation takes minutes instead of days.
Let's build something legendary
Get paid without chasing.
Tell us how you bill today and we'll send an automation plan and quote.
Takes about 4 minutes Itemized, written quotation Reply within 2 working hours