You do growth.
    We the rest.

    Accounting, HR, tax, compliance—handled by experts who understand startups. You focus on growth. We handle the paperwork.

    See pricing
    >25'000
    hours saved
    150+
    clients trust us
    54
    net promoter score

    Trusted by Germany's fastest-growing companies

    PHLAIR
    Voize
    Pyne
    Edgeless Systems
    dltHub
    Deltia.ai

    The modern back-office

    We take care of the numbers. You take care of the vision.

    From day one to IPO, APX handles your accounting, payroll, HR, tax, and compliance—so your team can focus entirely on building something great.

    Move faster

    No more chasing paperwork or waiting for your accountant. Everything handled proactively, so you can focus on what matters.

    Learn more

    Sleep soundly

    German tax law is complex. Our experts ensure you're always compliant, so you never worry about penalties or audits.

    Scale effortlessly

    From 5 employees to 500, our systems grow with you. No surprise fees, no growing pains, no limits.

    Up and running in days, not months

    We've made switching painless. Most clients are fully onboarded within a week.

    Quick consultation

    30-minute call to understand your needs. No sales pitch, just solutions.

    Seamless handover

    We handle the transition from your current provider. You don't lift a finger.

    Focus on building

    We handle everything. You get back to growing your business.

    Our Services

    Everything you need. Nothing you don't.

    One partner for all your back-office needs. Simple pricing, no surprises.

    See all services & pricing

    Monthly accounting

    Books closed by the 15th. Every month. Guaranteed.

    Financial statements

    Annual reports, balance sheets, and investor-ready financials.

    HR & payroll

    Contracts, payroll, benefits—your people, our paperwork.

    CFO & tax advisory

    Strategic finance guidance when you need it most.

    "You cannot believe how happy we are to be working with you. The contrast to our previous partner is insane. APX actually gets what startups need."
    RG
    Roman Geugelin
    Founder & CEO, pyne

    "Are you sure you're a tax consultancy? You've optimized our accounting so much that we save time every single day."

    MK
    Mirjam Knecht
    EA to CEO, Edgeless Systems

    "Finally, a back-office partner that speaks our language. Slack messages instead of phone calls. APIs instead of spreadsheets."

    CZ
    Christopher Ziegler
    Founder & CEO, HappyOps

    Frequently asked questions

    What does APX cost as a tax advisor for startups?
    Pricing scales with company size and complexity. Standard bookkeeping packages cost €149/month plus 0.25% of expenses — see the pricing page for package details.
    How fast can I move from my current tax advisor to APX?
    7–14 days, depending on the complexity of your DATEV history. We handle the data handover and power-of-attorney updates for you.
    Which tools does APX integrate with natively?
    DATEV as the backbone, plus Stripe, Qonto, Pleo, Moss, Xero, Slack, OneDrive and Google Drive. We also integrate other systems on request.
    Am I working with a tax advisor or with a software provider?
    Both. APX is a tax advisory firm with customer apps, APIs (Excel/Sheets add-on, financial-data API, client app) and integrations into your tooling.
    Who is my point of contact at APX?
    You work with a dedicated team of specialists — accounting, tax, HR & payroll, CFO advisory — and can reach any of them directly via Slack.
    Does APX handle payroll and HR too?
    Yes. HR-as-a-Service covers and payroll and all administrative HR work.
    Can APX manage our holding structure?
    Yes. Holding setup, ongoing tax optimisation, and exit-readiness are part of standard service. Tax & CFO Advisory walks teams from Series A to exit.
    Are APX deliverables ready for Series A due diligence?
    Yes — Quality of Earnings, HGB/IFRS balance sheets, ARR/MRR tracking, deferred-revenue schedules, all delivered investor-ready. Customer Stories show how SaaS clients have used these for closes up to Series C.
    How does day-to-day collaboration with APX work?
    Reachable via Slack whenever you have questions — no long response times, no ticketing systems. And we work in your existing tools (Google Drive, OneDrive, Notion, whatever you use) instead of parallel structures. You don't need to adopt new systems or change your processes for us — we come to you, not the other way around.

    Ready to get your time back?

    Join 150+ clients who've already made the switch. We're ready when you are.

    Up and running in a week
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    Expert support included