Vision
To modernize and democratize tax technology, empowering accounting firms of all sizes and family offices with enterprise-grade engines that eliminate manual toil and ensure absolute precision.
Pebble Stream consultancy
Complex tax models, built in Pebble Stream.
We design, build, and modernize the allocation and investment models your practice depends on — hands-on consulting for firms that need enterprise-grade solutions without an enterprise-sized project.
Why we exist
Precision is the product. Access is the point.
TaxOnFabric was founded on two convictions: that advanced tax logic should not be reserved for the largest firms, and that software should carry the complexity so practitioners can focus on judgment.
Mission
We build robust, high-performance tax allocation and compliance software that bridges the gap between complex regulatory demands and everyday practical workflows. By combining deep tax domain expertise with modern software architecture, we give small-to-mid-sized firms and family offices the technical leverage they need to scale efficiently, serve clients better, and compete with the industry giants.
Pebble Stream consultancy
Hands-on help, from first structure to final review.
We work alongside your tax team to design, build, and modernize the models your practice runs on — using Pebble Stream, the platform large firms are using to enable new capabilities and extend their competitive reach.
Model design
Planning goes a long way.
We discuss your goals and objectives in light of existing processes and infrastructure.
Build & implementation
Models built in Pebble Stream.
We build the model, connect it to your source data, all while achieving unparalleled transparency and governance.
Legacy migration
Retire the old engines with confidence.
Parallel runs and reconciliation against prior results prove the new model is right before you cut over.
Review & handover
Documented, tested, and yours to run.
Documented logic and focused training leave your team able to maintain and extend the model on its own.
Who we serve
Built for the teams who carry the work.
Enterprise-grade capability, sized and priced for the firms that need it most.
Small & mid-sized accounting firms
Take on complex allocation and compliance engagements without building an internal technology team or buying an oversized platform.
Family offices
Handle intricate entity structures and multi-party allocations with precision, continuity, and a clear audit trail.
Growing practices
Scale capacity and standardize quality as your client list grows — without proportionally growing headcount.
How we work
Domain depth, engineered in.
Our team has implemented enterprise tax software inside large accounting firms and built models on Pebble Stream — replacing legacy calculation engines with modern, auditable workflows.
Correct by construction
Rules are encoded once and applied consistently, so results are reproducible and review-ready.
Practical by default
Powerful logic behind a workflow your team can adopt without a lengthy implementation project.
Tax people, not just engineers
Deep tax domain knowledge shapes every decision, from the data model to the error message.
Compete with the giants
Give lean teams the technical leverage to deliver work that used to require enterprise-scale resources.
Representative list of models we've built
- Hedge fund partner allocations
- Fund-of-funds partner allocations
- Forward & reverse 704(c)
- Tiered allocations
- K-1 / K-3 allocation balancing
- Investment tax analysis
- Original issue discount
- Debt amortization
- Loan payment schedules
- Loan modifications
- Fixed asset depreciation
- REIT testing
- Tax receivable agreements
- State apportionment
- PTET
- Composite
- Withholding
- NYC UBT
- SALT credit sharing
Book a meeting
A 30-minute working session.
Whether you want an off-the-shelf solution, a custom-built solution, or something in-between, let’s chat.
Request a 30-minute call
Prefer email? mapowell@taxonfabric.com
Founder
Tax depth, built into every line of code.
TaxOnFabric was founded by Mark Powell, a tax technologist who has designed and built tax software at four of the world’s five largest accounting firms (BDO, Deloitte, EY, and PwC), tax and risk mitigation software at SEI Investments (a world class fin-tech firm), and audit software for a sole practitioner.
That combination is rare. The same person can gather requirements, conduct deep tax research, evaluate source code, and build the engine that carries it into production.
“I have taken part in big-budget builds carried by a flotilla of cutting edge technologies. When Pebble Stream arrived on the scene, it changed how I approach business and tax software development. For most use cases I have found it far more capable, agile, transparent, and auditable — and orders of magnitude cheaper — while outmaneuvering and outperforming most pro-code solutions.”
— Founder, TaxOnFabric
What others say about Mark
In their words.
Brilliant, Selfless, Determined.
One of the best I have ever seen at removing obstacles and opening up doors that lead to far superior and efficient ways of doing things via the use of technology.
Every bit as good or better than the best of the ‘off the shelf’ systems that cost firms millions of dollars.
Quoted from a colleague’s nomination of Mark for the SEInstein Innovation Icon Award at SEI Investments.
Contact
Let’s talk about what you’re building.
Tell us about your allocation or compliance challenge. We usually reply within one business day, and we are happy to start with a 30-minute call.
What to expect
- A reply by email, usually within two business days.
- A short, focused conversation about your workflow — no lengthy sales process.
- Your information is used only to respond to this inquiry.