The register
The register lists Taxmart Ltd in London as a licensed sponsor on Skilled Worker, an entry that goes back to at least 2026. Its rating on the register is Worker (A rating).
Taxmart Ltd is the registered name (Companies House number 09065511), a private limited company on the register since 2014. The registered office is at Unit- 052 Stratford Workshops Burford Road, London, E15 2SP, E15 2SP. Its filed activity puts it in professional and technical services. It has traded under other names before, including Taxcalcaccountants Ltd, Taxcalc Accountants Ltd.
What the licence tells a candidate is that the door is not locked. Whether it is open this month is a question for Taxmart Ltd's own careers page and the job boards, and the answer changes with the season and the order book.